阅读说明：本技术 一种水中提取豌豆清蛋白的工艺方法及其装置 (process method and device for extracting pea albumin from water ) 是由 张树成 杨进洁 房万才 刘长宝 杨国栋 臧庆佳 于 2019-09-27 设计创作，主要内容包括：本发明提供一种水中提取豌豆清蛋白的工艺方法及其装置,包括以下步骤：准备废水,将废水倒入离心机,最终获得第一清液；第一清液通过第一浓缩膜进行浓缩,形成第一浓液和第一清水两种物质；所述第一浓液通过超滤膜将其中的糖类分离出来,形成第二清液和截留液；所述截留液再通过第二浓缩膜进行浓缩,形成第二浓液和第二清水；压力循环组件同时还改变反渗透膜底部的空气压强,以及第二浓缩膜底端的空气压强；对第二浓液进行配伍干燥,获得豌豆蛋白粉。本发明提供的水中提取豌豆清蛋白的工艺方法及其装置,解决了如何从废水中提取豌豆蛋白的技术问题,节约了水资源,增加了水资源利用的附加值。(the invention provides a process method for extracting pea albumin from water and a device thereof, comprising the following steps: preparing wastewater, pouring the wastewater into a centrifugal machine, and finally obtaining a first clear liquid; concentrating the first clear liquid through a first concentration membrane to form a first concentrated liquid and a first clear water; separating the saccharides from the first concentrated solution by an ultrafiltration membrane to form a second clear solution and a trapped solution; concentrating the trapped fluid by a second concentration membrane to form a second concentrated solution and second clear water; the pressure circulation component also changes the air pressure at the bottom of the reverse osmosis membrane and the air pressure at the bottom end of the second concentration membrane; and carrying out compatibility drying on the second concentrated solution to obtain pea protein powder. The process method and the device for extracting pea albumin from water solve the technical problem of how to extract pea protein from wastewater, save water resources and increase the added value of water resource utilization.)

1. a process method for extracting pea albumin from water is characterized by comprising the following steps:

step S1: preparing wastewater, adjusting the temperature of the wastewater, pouring the wastewater into a centrifugal machine, and precipitating large particles in the wastewater under the action of the centrifugal machine to finally obtain a first clear liquid;

step S2: concentrating the first clear liquid through a first concentration membrane to form a first concentrated liquid and a first clear water, wherein the first concentrated liquid is reserved, and the first clear water is subjected to reverse osmosis through a reverse osmosis membrane to obtain purified water;

step S3: increasing the air pressure at the upper end of the first concentrating membrane and increasing the permeation speed through the pressure circulation component;

step S4: sterilizing powder is placed in the purified water for sterilization;

step S5: separating the saccharides from the first concentrated solution by an ultrafiltration membrane to form a second clear solution and a trapped solution, wherein the trapped solution contains concentrated protein, and the second clear solution contains saccharides;

step S6: concentrating the trapped fluid by a second concentration membrane to form a second concentrated solution and second clear water, and regulating and neutralizing the second concentrated solution by PH;

step S7: the pressure circulation component also changes the air pressure at the bottom of the reverse osmosis membrane and the air pressure at the bottom end of the second concentration membrane, and the top end of the second concentration membrane is communicated with the top end of the first concentration membrane, so that a circulation process is formed;

Step S8: and carrying out compatibility drying on the second concentrated solution to obtain pea protein powder.

2. The process for extracting pea albumin from water as claimed in claim 1, wherein in the step S1 and the step S2, the first clear liquid in the centrifuge flows into the concentration membrane from top to bottom, the first concentrated liquid is formed at the upper end of the concentration membrane by the action of the concentration membrane, the first clear water is formed at the lower end of the concentration membrane, the first clear water flows into the reverse osmosis membrane from top to bottom, and purified water is obtained by the action of the reverse osmosis membrane.

3. the process for extracting pea albumin from water as claimed in claim 2, wherein in step S4, the disinfectant powder is directly placed on the reverse osmosis membrane, and after the first clear water enters the reverse osmosis membrane, the first clear water is disinfected while being subjected to reverse osmosis.

4. The process of claim 3, wherein in steps S5 and S6, the first concentrated solution is removed from the concentrating membrane and introduced to an ultrafiltration membrane, and a second clear solution and a retentate are formed, wherein the second clear solution leaks out through the ultrafiltration membrane, and the retentate is contacted with the ultrafiltration membrane;

And a second concentration membrane is arranged close to the ultrafiltration membrane, the trapped liquid is separated into second concentrated liquid and second clear water, the second concentrated liquid is positioned on the second concentration membrane, and the second clear water descends through the second concentration membrane and is mixed with the second clear liquid.

5. The device for extracting pea albumin from water is characterized by comprising a first separation component for performing centrifugal treatment on wastewater, a first concentration membrane arranged at the lower end of the first separation component, a reverse osmosis membrane arranged at the lower end of the first concentration membrane, a second separation component for separating and concentrating the first concentrated solution and a pressure circulation component for increasing the permeation speed, wherein the first separation component and the first concentration membrane are arranged in a vertical cylinder, the reverse osmosis membrane is arranged in a receiving groove, and the receiving groove is arranged at the bottom end of the vertical cylinder;

the second separation component is arranged on the outer side of the vertical cylinder and is connected with the first concentration membrane.

6. the device for extracting pea albumin from water as claimed in claim 5, wherein the first separation assembly comprises the upright barrel which is vertically placed, a centrifugal machine which is arranged at the upper end part of the upright barrel, and a power mechanism which is used for driving the centrifugal machine to rotate, a top cover is arranged at the top end of the upright barrel, and the power mechanism is arranged on the top cover;

The centrifugal cover is characterized in that a horizontally placed support ring is arranged in the vertical cylinder, and the bottom of the centrifugal cover is arranged on the support ring.

7. The apparatus as claimed in claim 6, wherein a third nozzle plate is provided in the vertical cylinder, the third nozzle plate is provided at the lower end of the support ring, and a first concentrating membrane is provided on the third nozzle plate;

The third bushing is a conical part with an upward opening, a through hole is formed in the bottom of the center of the third bushing, and the through hole is connected with the second separation assembly.

8. the device for extracting pea albumins in water as claimed in claim 7, wherein a first leakage plate is arranged at the bottom of the third leakage plate, the reverse osmosis membrane is arranged on the first leakage plate, the first leakage plate is connected with the bottom end of the vertical cylinder, and the lower end of the vertical cylinder is connected with the first receiving groove;

the outer side surface of the lower end of the vertical cylinder is provided with a protruding ring, the upper end surface of the first receiving groove is provided with an opening, the protruding ring is arranged on the top end surface of the first receiving groove, and the first bushing plate is arranged inside the first receiving groove.

9. the apparatus for extracting pea albumins from water as set forth in claim 8, wherein the second separation assembly comprises a second suction pipe having one end connected to the central bottom of the third nozzle plate, a second suction machine connected to the other end of the second suction pipe, a third receiving trough connected to the second suction machine, and a second receiving trough disposed at the bottom of the third receiving trough;

a second bushing plate is arranged at the bottom end of the third bearing groove, the second bushing plate is arranged in the second bearing groove, a circular truncated cone bushing plate is arranged on the upper end face of the second bushing plate, the circular truncated cone bushing plate is in a shell shape, the opening of the large end face of the circular truncated cone bushing plate is downward, and air leakage is formed in the top end face and the outer side face of the circular truncated cone bushing plate;

And the circular truncated cone bushing is provided with an ultrafiltration membrane, and the second bushing is provided with a second concentration membrane.

10. the apparatus for extracting pea albumin from water as claimed in claim 9, wherein said pressure cycle assembly comprises an exhaust pipe having one end connected to a side of said vertical cylinder, a first suction machine connected to another end of said exhaust pipe, a first suction pipe connected to said first receiving tank and said second receiving tank, a second suction pipe connected to said second suction machine and said vertical cylinder, said first suction machine being in communication with said first receiving tank, said second suction machine being in communication with said third receiving tank;

The end of the exhaust pipe connected with the vertical cylinder is arranged at the upper end of the first leakage plate, and the end of the second suction pipe connected with the first concentration membrane is arranged at the lower end of the first leakage plate.

Technical Field

The invention belongs to the field of food industrial production, and particularly relates to a method for extracting pea albumin from process water for producing protein by peas.

background

Peas belong to the legume plant, and are rich in various nutrients required by the human body, especially high-quality protein. Moreover, legumes do not contain cholesterol, which is superior to animal proteins. The pea protein powder is high-quality protein separated and extracted from peas by adopting an advanced process and a low-temperature low-pressure technology, contains eighteen amino acids necessary for human bodies, and belongs to complete-value protein. Pea → cleaning → soaking → jordaning → separation of pulp and dreg → centrifugal removal of starch → acid precipitation → centrifugal separation → alkaline dissolution of precipitate → spray drying → finished product. And soaking the peas with the impurities removed in water for 12-24 hours, then rinsing the peas clean with clear water, grinding the peas into thick liquid by using a grinding wheel mill, and repeatedly grinding the bean dregs for 3 times. Centrifuging the slurry at 1500r/min for 3min to remove residue, adjusting pH of the supernatant to about 4.4 with acid to precipitate protein, centrifuging to remove supernatant, adjusting pH of the acid precipitated protein to about 7.0 with alkali to dissolve protein, homogenizing, and spray drying to obtain pea protein powder.

Because the protein has lighter specific gravity, smaller molecular weight and lighter taste and color compared with the conventional protein produced in daily life, the protein exists in the wastewater produced by the conventional protein production, and because the environmental protection problem is increasingly serious, and in addition, the high value of the low-molecular weight high-quality protein powder, from the aspects of energy conservation, environmental protection and added value increase, the research on how to extract the pea protein from the water is necessary.

Disclosure of Invention

the invention aims to provide a process method and a device for extracting pea albumin from water, which solve the technical problem of how to extract pea protein from wastewater, save water resources and increase the additional value of water resource utilization.

A process method for extracting pea albumin from water comprises the following steps:

Step S1: preparing wastewater, adjusting the temperature of the wastewater, pouring the wastewater into a centrifugal machine, and precipitating large particles in the wastewater under the action of the centrifugal machine to finally obtain a first clear liquid;

step S2: concentrating the first clear liquid through a first concentration membrane to form a first concentrated liquid and a first clear water, wherein the first concentrated liquid is reserved, and the first clear water is subjected to reverse osmosis through a reverse osmosis membrane to obtain purified water;

Step S3: increasing the air pressure at the upper end of the first concentrating membrane and increasing the permeation speed through the pressure circulation component;

Step S4: sterilizing powder is placed in the purified water for sterilization;

step S5: separating the saccharides from the first concentrated solution by an ultrafiltration membrane to form a second clear solution and a trapped solution, wherein the trapped solution contains concentrated protein, and the second clear solution contains saccharides;

Step S6: concentrating the trapped fluid by a second concentration membrane to form a second concentrated solution and second clear water, and regulating and neutralizing the second concentrated solution by PH;

step S7: the pressure circulation component also changes the air pressure at the bottom of the reverse osmosis membrane and the air pressure at the bottom end of the second concentration membrane, and the top end of the second concentration membrane is communicated with the top end of the first concentration membrane, so that a circulation process is formed;

step S8: and carrying out compatibility drying on the second concentrated solution to obtain pea protein powder.

in the step S1 and the step S2, the first clear liquid in the centrifuge flows into the concentration membrane from top to bottom, the first concentrated liquid is formed at the upper end of the concentration membrane by the action of the concentration membrane, the first clear water is formed at the lower end of the concentration membrane, and the first clear water enters the reverse osmosis membrane from top to bottom, so that purified water is obtained by the action of the reverse osmosis membrane.

in the step S4, the disinfectant powder can be directly placed on the reverse osmosis membrane, and when the first clean water enters the reverse osmosis membrane, the disinfection treatment can be performed while the first clean water enters the reverse osmosis membrane.

in the step S5 and the step S6, the first concentrated solution is removed from the concentration membrane and enters an ultrafiltration membrane to form a second clear solution and a trapped solution, the second clear solution leaks out through the ultrafiltration membrane, and the trapped solution is contacted with the ultrafiltration membrane;

And a second concentration membrane is arranged close to the ultrafiltration membrane, the trapped liquid is separated into second concentrated liquid and second clear water, the second concentrated liquid is positioned on the second concentration membrane, and the second clear water descends through the second concentration membrane and is mixed with the second clear liquid.

A device for extracting pea albumin from water comprises a first separation component for performing centrifugal treatment on wastewater, a first concentration membrane arranged at the lower end of the first separation component, a reverse osmosis membrane arranged at the lower end of the first concentration membrane, a second separation component for separating and concentrating a first concentrated solution, and a pressure circulation component for increasing the permeation speed, wherein the first separation component and the first concentration membrane are arranged in a vertical cylinder, the reverse osmosis membrane is arranged in a receiving groove, and the receiving groove is arranged at the bottom end of the vertical cylinder;

the second separation component is arranged on the outer side of the vertical cylinder and is connected with the first concentration membrane.

The first separation assembly comprises the vertical cylinder which is vertically placed, a centrifugal machine which is arranged at the upper end part of the vertical cylinder and a power mechanism which is used for driving the centrifugal machine to rotate, a top cover is arranged at the top end of the vertical cylinder, and the power mechanism is arranged on the top cover;

the centrifugal cover is characterized in that a horizontally placed support ring is arranged in the vertical cylinder, and the bottom of the centrifugal cover is arranged on the support ring.

A third bushing plate is arranged in the vertical cylinder, the third bushing plate is arranged at the lower end of the support ring, and a first concentration film is arranged on the third bushing plate;

the third bushing is a conical part with an upward opening, a through hole is formed in the bottom of the center of the third bushing, and the through hole is connected with the second separation assembly.

The bottom of the third bushing is provided with a first bushing, the first bushing is provided with the reverse osmosis membrane, the first bushing is connected with the bottom end of the vertical cylinder, and the lower end part of the vertical cylinder is connected with a first bearing groove;

the outer side surface of the lower end of the vertical cylinder is provided with a protruding ring, the upper end surface of the first receiving groove is provided with an opening, the protruding ring is arranged on the top end surface of the first receiving groove, and the first bushing plate is arranged inside the first receiving groove.

The second separation assembly comprises a second suction pipe, a second suction machine, a third bearing groove and a second bearing groove, wherein one end of the second suction pipe is connected with the central bottom of the third bushing plate, the second suction machine is connected with the other end of the second suction pipe, the third bearing groove is connected with the second suction machine, and the second bearing groove is arranged at the bottom of the third bearing groove;

A second bushing plate is arranged at the bottom end of the third bearing groove, the second bushing plate is arranged in the second bearing groove, a circular truncated cone bushing plate is arranged on the upper end face of the second bushing plate, the circular truncated cone bushing plate is in a shell shape, the opening of the large end face of the circular truncated cone bushing plate is downward, and air leakage is formed in the top end face and the outer side face of the circular truncated cone bushing plate;

And the circular truncated cone bushing is provided with an ultrafiltration membrane, and the second bushing is provided with a second concentration membrane.

The pressure circulation assembly comprises an exhaust pipe, a first suction machine, a first suction pipe and a second suction pipe, wherein one end of the exhaust pipe is connected with the side part of the vertical cylinder, the first suction machine is connected with the other end of the exhaust pipe, the first suction pipe is connected with the first bearing groove and the second bearing groove, the second suction machine is connected with the vertical cylinder, the first suction machine is communicated with the first bearing groove, and the second suction machine is communicated with the third bearing groove;

the end of the exhaust pipe connected with the vertical cylinder is arranged at the upper end of the first leakage plate, and the end of the second suction pipe connected with the first concentration membrane is arranged at the lower end of the first leakage plate.

the invention achieves the following remarkable effects:

(1) Compared with the conventional protein produced in daily life, the pea protein has lighter specific gravity, smaller molecular weight, lighter taste and color and is easier to be absorbed by human bodies, and is easily accepted by target people;

(2) according to the pea protein extraction device, a plurality of filtering processes are arranged in a centralized manner, so that the space is saved, the working efficiency is improved, and the whole process is intensified and simplified;

(3) The pressure circulation assembly is arranged, when the first suction machine and the second suction machine work, the air pressure at the upper end or the lower end of the filter membrane is controlled, the liquid filtering speed is further improved, and the whole pea protein preparation process can be continuously carried out.

drawings

FIG. 1 is a schematic view of a manufacturing apparatus according to an embodiment of the present invention.

fig. 2 is a schematic structural diagram of a first separating assembly in an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of the vertical cylinder in the embodiment of the invention.

Fig. 4 is a schematic structural diagram of a second separation assembly in an embodiment of the present invention.

FIG. 5 is a schematic structural view of a third receiving groove in the embodiment of the present invention.

wherein the reference numerals are: 1. a power mechanism; 1-1, a rotating shaft; 1-2, a centrifugal machine; 2. a top cover; 3. erecting a cylinder; 3-1, a protruding ring; 3-2, a support ring; 3-3, a first bushing; 4. an exhaust pipe; 5. a first suction machine; 6. a first receiving groove; 7. a second receiving groove; 8. a third receiving groove; 8-1, a lap plate; 8-2, a circular truncated cone bushing; 8-3, a second bushing; 9. a second suction machine; 10. a first straw; 11. a second straw; 11-1 and a third nozzle plate.

Detailed Description

in order to clearly illustrate the technical features of the present solution, the present solution is described below by way of specific embodiments.

Referring to fig. 1, a process method for extracting pea albumin from water comprises the following steps:

Step S1: preparing wastewater, adjusting the temperature of the wastewater, pouring the wastewater into a centrifuge 1-2, and precipitating large particles in the wastewater under the action of the centrifuge 1-2 to finally obtain a first clear liquid;

Step S2: concentrating the first clear liquid through a first concentration membrane to form a first concentrated solution and a first clear water, wherein the first concentrated solution is reserved, and the first clear water is subjected to reverse osmosis through a reverse osmosis membrane to obtain purified water;

step S3: increasing the air pressure at the upper end of the first concentrating membrane and increasing the permeation speed through the pressure circulation component;

step S4: sterilizing powder is placed in the purified water for sterilization;

Step S5: separating the saccharides from the first concentrated solution by an ultrafiltration membrane to form a second clear solution and a trapped solution, wherein the trapped solution contains concentrated protein, and the second clear solution contains saccharides;

step S6: concentrating the trapped solution by a second concentration membrane to form a second concentrated solution and second clear water, and regulating and neutralizing the second concentrated solution by PH;

step S7: the pressure circulation component also changes the air pressure at the bottom of the reverse osmosis membrane and the air pressure at the bottom end of the second concentration membrane, and the top end of the second concentration membrane is communicated with the top end of the first concentration membrane, so that a circulation process is formed;

Step S8: and carrying out compatibility drying on the second concentrated solution to obtain pea protein powder.

In the steps S1 and S2, the first clear liquid in the centrifuge 1-2 flows into the concentration membrane from top to bottom, the first concentrated liquid is formed at the upper end of the concentration membrane by the action of the concentration membrane, the first clear water is formed at the lower end of the concentration membrane, and the first clear water enters the reverse osmosis membrane from top to bottom, and purified water is obtained by the action of the reverse osmosis membrane.

In step S4, the disinfectant powder can be directly placed on the reverse osmosis membrane, and when the first clean water enters the reverse osmosis membrane, the disinfection treatment can be performed while the first clean water enters the reverse osmosis membrane.

In the step S5 and the step S6, the first concentrated solution is removed from the concentration membrane and enters an ultrafiltration membrane to form a second clear solution and a trapped solution, the second clear solution leaks out through the ultrafiltration membrane, and the trapped solution is contacted with the ultrafiltration membrane;

And a second concentration membrane is arranged close to the ultrafiltration membrane, the trapped liquid is separated into second concentrated liquid and second clear water, the second concentrated liquid is positioned on the second concentration membrane, and the second clear water descends through the second concentration membrane and is mixed with the second clear liquid.

Referring to fig. 2, 3 and 4, the device for extracting pea albumin in water comprises a first separation component for performing centrifugal treatment on wastewater, a first concentration membrane arranged at the lower end of the first separation component, a reverse osmosis membrane arranged at the lower end of the first concentration membrane, a second separation component for separating and concentrating a first concentrated solution, and a pressure circulation component for increasing the permeation speed, wherein the first separation component and the first concentration membrane are arranged in a vertical cylinder 3, the reverse osmosis membrane is arranged in a receiving groove, and the receiving groove is arranged at the bottom end of the vertical cylinder 3;

The second separation component is arranged on the outer side of the vertical cylinder 3 and is connected with the first concentration membrane.

the first separation assembly comprises a vertical barrel 3 which is vertically arranged, a centrifugal machine 1-2 which is arranged at the upper end part of the vertical barrel 3 and a power mechanism 1 which is used for driving the centrifugal machine 1-2 to rotate, a top cover 2 is arranged at the top end of the vertical barrel 3, the power mechanism 1 is arranged on the top cover 2, and the power mechanism 1 is connected with the centrifugal machine 1-2 through a rotating shaft 1-1 which is vertically arranged;

a support ring 3-2 which is horizontally arranged is arranged in the vertical cylinder 3, and the bottom of the centrifugal cover is arranged on the support ring 3-2.

A third bushing plate 11-1 is arranged in the vertical cylinder 3, the third bushing plate 11-1 is arranged at the lower end of the support ring 3-2, and a first concentration film is arranged on the third bushing plate 11-1;

the third nozzle plate 11-1 is a conical part with an upward opening, and the bottom of the center of the third nozzle plate 11-1 is provided with a through hole connected with the second separation assembly.

The bottom of the third bushing 11-1 is provided with a first bushing 3-3, the first bushing 3-3 is provided with a reverse osmosis membrane, the first bushing 3-3 is connected with the bottom end of the vertical barrel 3, and the lower end part of the vertical barrel 3 is connected with the first bearing groove 6;

the outer side surface of the lower end of the vertical barrel 3 is provided with a protruding ring 3-1, the upper end surface of the first bearing groove 6 is provided with an opening, the protruding ring 3-1 is arranged on the top end surface of the first bearing groove 6, and the first bushing 3-3 is arranged inside the first bearing groove 6.

the second separation assembly comprises a second suction pipe 11, one end of which is connected with the central bottom of the third bushing 11-1, a second suction machine 9, a third bearing groove 8 and a second bearing groove 7, wherein the second suction machine 9 is connected with the other end of the second suction pipe 11, the third bearing groove 8 is connected with the second suction machine 9, and the second bearing groove 7 is arranged at the bottom of the third bearing groove 8;

referring to fig. 5, a second bushing 8-3 is arranged at the bottom end of the third bearing groove 8, the second bushing 8-3 is arranged in the second bearing groove 7, a circular truncated cone bushing 8-2 is arranged on the upper end face of the second bushing 8-3, the circular truncated cone bushing 8-2 is in a shell shape, the large end face of the circular truncated cone bushing is opened downwards, and a gap is formed in the top end face and the outer side face of the circular truncated cone bushing 8-2;

The circular truncated cone bushing plate 8-2 is provided with an ultrafiltration membrane, and the second bushing plate 8-3 is provided with a second concentration membrane.

and the outer side surface of the third bearing groove is provided with a lapping plate 8-1, and the lapping plate is arranged on the upper end surface of the second bearing groove.

the pressure circulation assembly comprises an exhaust pipe 4, one end of which is connected with the side part of the vertical cylinder 3, a first suction machine 5, a first suction pipe 10, a second suction machine 9 and a second suction pipe 11, wherein the other end of the exhaust pipe 4 is connected with the first suction machine 5, the first suction pipe 10 is connected with the first receiving groove 6 and the second receiving groove 7, the second suction machine 9 is connected with the vertical cylinder 3, the first suction machine 5 is communicated with the first receiving groove 6, and the second suction machine 9 is communicated with the third receiving groove 8;

One end of the exhaust pipe 4 connected with the vertical cylinder 3 is arranged at the upper end of the first leakage plate 3-3, and one end of the second suction pipe 11 connected with the first concentration membrane is arranged at the lower end of the first leakage plate 3-3.

The working process of the invention is as follows:

Firstly, starting a centrifuge 1-2 in a first separation component, arranging a first concentration membrane in the centrifuge 1-2 under the action of the centrifuge 1-2, concentrating a first clear liquid through the first concentration membrane to form two substances, namely a first concentrated liquid and a first clear water, wherein the first concentrated liquid is reserved, namely is positioned at the upper end of the first concentration membrane, the first clear water enters the upper end of a reverse osmosis membrane through the first concentration membrane, purified water is obtained through a reverse osmosis process, and a reverse osmosis solution is arranged in a first receiving groove 6;

Starting a second separation component to enable a second suction machine 9 to work, enabling the first concentrated solution to enter a third accepting groove 8 through a second suction pipe 11 and pass through an ultrafiltration membrane, wherein the ultrafiltration membrane is arranged on a circular truncated cone drain plate 8-2 to form a second clear solution and a trapped solution, the trapped solution contains concentrated protein, the second clear solution contains saccharides, and the second clear solution enters a second accepting groove 7 through the ultrafiltration membrane;

in addition, the trapped liquid is contacted with a second concentration membrane on a second leakage plate 8-3, the trapped liquid is separated into a second concentrated liquid and second clear water, the second concentrated liquid remains at the upper end of the second concentration membrane, and the second clear water enters a second receiving groove 7 through the second leakage plate 8-3;

and (4) after the pH and temperature regulation measures are taken, performing compatibility drying on the second concentrated solution to obtain the pea protein.

The technical features of the present invention which are not described in the above embodiments may be implemented by or using the prior art, and are not described herein again, of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and variations, modifications, additions or substitutions which may be made by those skilled in the art within the spirit and scope of the present invention should also fall within the protection scope of the present invention.