阅读说明：本技术 一种自动化二级蒸馏乳酸精制生产线的操作方法 (Operation method of automatic secondary distillation lactic acid refining production line ) 是由 王颖 于 2021-09-26 设计创作，主要内容包括：一种自动化二级蒸馏乳酸精制生产线的操作方法,钢架结构一端设置步梯,钢架结构上由左至右依次设置一级薄膜蒸发器、二级薄膜蒸发器、一级短程分子蒸馏器、二级短程分子蒸馏器,一级薄膜蒸发器和二级薄膜蒸发器之间设置重相储存罐,一级短程分子蒸馏器和二级短程分子蒸馏器一侧均设置重相储存罐,一级薄膜蒸发器上端一侧的钢架结构上设置进料泵,钢架结构后侧由左至右依次设置冷凝机组、真空机组、加热机组；本发明全连续化操作,能够实现以92％的高纯级乳酸为原料通过薄膜蒸发,薄膜蒸发,分子蒸馏,分子蒸馏四级蒸馏实现脱水以及乳酸精制的功能,得到100％的医用级精制乳酸。(An automatic operation method of a two-stage distillation lactic acid refining production line comprises the steps arranged at one end of a steel frame structure, a first-stage film evaporator, a second-stage film evaporator, a first-stage short-path molecular distiller and a second-stage short-path molecular distiller are sequentially arranged on the steel frame structure from left to right, a heavy phase storage tank is arranged between the first-stage film evaporator and the second-stage film evaporator, the heavy phase storage tanks are arranged on one sides of the first-stage short-path molecular distiller and the second-stage short-path molecular distiller, a feed pump is arranged on the steel frame structure on one side of the upper end of the first-stage short-path molecular distiller, and a condensing unit, a vacuum unit and a heating unit are sequentially arranged on the rear side of the steel frame structure from left to right; the full-continuous operation of the invention can realize the functions of dehydration and lactic acid refining by using 92 percent of high-purity lactic acid as a raw material through film evaporation, molecular distillation and molecular distillation four-stage distillation, thereby obtaining 100 percent of medical grade refined lactic acid.)

1. An operation method of an automatic secondary distillation lactic acid refining production line, which comprises the following steps: the device comprises a steel frame structure (1), a step ladder (2), a primary film evaporator (3), a secondary film evaporator (4), a primary short-range molecular distiller (5), a secondary short-range molecular distiller (6), a heavy phase storage tank (7), a feeding pump (8), an acid water discharging pump (9), a primary transmission pump (10), a secondary transmission pump (11), a primary light phase discharging pump (12), a secondary light phase discharging pump (12.1), a heavy phase discharging pump (13), a condensing unit (14), a vacuum unit (15), a heating unit (16), a console (17), a mobile phone end (18) and a discharging pipe (19); the method is characterized in that: one end of a steel frame structure (1) is provided with a step ladder (2), a first-stage film evaporator (3), a second-stage film evaporator (4), a first-stage short-range molecular distiller (5) and a second-stage short-range molecular distiller (6) are sequentially arranged on the steel frame structure (1) from left to right, a heavy-phase storage tank (7) is arranged between the first-stage film evaporator (3) and the second-stage film evaporator (4), the heavy-phase storage tank (7) is arranged on one side of the first-stage short-range molecular distiller (5) and one side of the second-stage short-range molecular distiller (6), a feed pump (8) is arranged on the steel frame structure (1) on one side of the upper end of the first-stage film evaporator (3), a pipeline is arranged between a discharge port of the feed pump (8) and a feed port of the first-stage film evaporator (3), a pipeline is arranged between the feed port of the feed pump (8) and a discharge port of the material storage tank, acid water discharge pumps (9) are arranged below slag outlets of the first-stage film evaporator (3) and the second-stage film evaporator (4), a pipeline is arranged between a feed inlet of a pair of acid water discharge pumps (9) and a slag outlet of the first-stage film evaporator (3) and the second-stage film evaporator (4), a pipeline is arranged between a discharge outlet of the acid water discharge pumps (9) and the heavy phase storage tank (7), a discharge outlet of the heavy phase storage tank (7) is provided with a discharge pipe (19), a first-stage transmission pump (10) and a second-stage transmission pump (11) are respectively arranged below discharge outlets of the first-stage film evaporator (3) and the second-stage film evaporator (4), a pipeline is arranged between a feed inlet of the first-stage transmission pump (10) and a discharge outlet of the first-stage film evaporator (3), a pipeline is arranged between a discharge outlet of the first-stage transmission pump (10) and a feed inlet of the second-stage film evaporator (4), a pipeline is arranged between a feed inlet of the second-stage transmission pump (11) and a discharge outlet of the second-stage film evaporator (4), and a pipeline is arranged between a discharge outlet of the second-stage transmission pump (11) and a feed inlet of the first-stage short-path molecular distiller (5), a first-stage light phase discharging pump (12) and a second-stage light phase discharging pump (12.1) are respectively arranged below light phase outlets of the first-stage short-range molecular distiller (5) and the second-stage short-range molecular distiller (6), a pipeline is arranged between a feed inlet of the first-stage light phase discharging pump (12) and the light phase outlet of the first-stage short-range molecular distiller (5), a pipeline is arranged between a discharge outlet of the first-stage light phase discharging pump (12) and a feed inlet of the second-stage short-range molecular distiller (6), a pipeline is arranged between a feed inlet of the second-stage light phase discharging pump (12.1) and the light phase outlet of the second-stage short-range molecular distiller (6), a discharging pipe (19) is arranged at a discharge outlet of the second-stage light phase discharging pump (12.1), a heavy phase discharging pump (13) is arranged below the heavy phase storage tank (7), a pipeline is arranged between a feed inlet of the heavy phase discharging pump (13) and a discharge outlet of the heavy phase storage tank (7), a discharging pipe (19) is arranged at a discharge outlet of the heavy phase discharging pump (13), the rear side of the steel frame structure (1) is sequentially provided with a condensing unit (14), a vacuum unit (15) and a heating unit (16) from left to right, the condensing unit (14), the vacuum unit (15), the heating unit (16), a first-stage film evaporator (3), a second-stage film evaporator (4), a first-stage short-range molecular distiller (5) and a second-stage short-range molecular distiller (6) are respectively provided with a pipeline, one side of the steel frame structure (1) is provided with a control console (17), and the control console (17) is wirelessly connected with a mobile phone end (18).

2. The operation method of the automatic secondary distillation lactic acid refining production line according to claim 1, characterized in that: the feeding pump (8) adopts a variable frequency gear pump.

3. The operation method of the automatic secondary distillation lactic acid refining production line according to claim 1, characterized in that: starting a feed pump (8) through a built-in program of a console (17) or a mobile phone end (18), pumping lactic acid in a material storage tank into a primary film evaporator (3) by the feed pump (8), evaporating the lactic acid in the primary film evaporator (3) to remove most of water in the lactic acid, conveying the lactic acid subjected to primary film evaporation into a secondary film evaporator (4) by a primary transmission pump (10) to perform secondary film evaporation, continuously removing water, conveying acid water generated in the primary film evaporation and the secondary film evaporation into a heavy phase storage tank (7) by an acid water discharge pump (9), conveying a light phase material subjected to secondary film evaporation to a primary short-distance molecular distiller (5) by a secondary transmission pump (11) to perform primary molecular distillation refining, conveying the lactic acid subjected to primary distillation refining to secondary molecular distillation refining to a secondary short-distance molecular distiller (6) by a primary light phase discharge pump (12), 100 percent of medical grade refined lactic acid is obtained after the secondary molecular distillation refining, and distillation residues generated in the primary molecular distillation refining and the secondary molecular distillation refining process respectively enter corresponding heavy phase storage tanks (7) through pipelines.

Technical Field

The invention relates to the technical field of lactic acid refining, in particular to an operation method of an automatic secondary distillation lactic acid refining production line.

Background

The lactic acid is a fine chemical product of food chemical industry, and the preparation process comprises the steps of taking corn or potato starch and calcium carbonate as main raw materials, adding microbial strains, fermenting and filtering the mixture to obtain calcium lactate liquid, carrying out concentration, acidolysis and other processes, filtering out calcium sulfate, separating to obtain industrial-grade crude lactic acid, and finally refining and purifying the industrial-grade crude lactic acid by a physical or chemical method to obtain the finished product lactic acid. In the prior art, there are many refining methods for industrial grade crude lactic acid, such as calcium lactate crystallization, esterification, extraction, ion exchange activated carbon decolorization, distillation, etc., wherein the crystallization method has complicated steps; the esterification method and the extraction method introduce organic solvents, and are not suitable for producing food-grade and pharmaceutical-grade lactic acid; the ion exchange activated carbon decolorization method has problems in the preparation and regeneration of separating agents; the distillation method is a physical purification method, particularly short-path distillation and molecular distillation are novel distillation technologies appearing in recent years, at present, shaped industrial distillation equipment is available in the market and is applied to the industries including vitamin E and grease chemical industry, at present, only refined lactic acid with the lactic acid content of 88-90% can be produced by the existing distillation method, and how to produce 100% medical grade refined lactic acid by the distillation method becomes a technical problem which is difficult to solve for a long time.

In view of the above, a method for operating an automated secondary distillation lactic acid refining line has been developed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides an operation method of an automatic secondary distillation lactic acid refining production line, which is a full-continuous operation and can realize the functions of dehydration and lactic acid refining by taking 92% of high-purity lactic acid as a raw material through thin-film evaporation, molecular distillation and molecular distillation four-stage distillation, so as to obtain 100% of medical-grade refined lactic acid.

In order to achieve the purpose, the invention adopts the following technical scheme: an operation method of an automatic secondary distillation lactic acid refining production line, which comprises the following steps: the device comprises a steel frame structure, a step ladder, a primary film evaporator, a secondary film evaporator, a primary short-range molecular distiller, a secondary short-range molecular distiller, a heavy phase storage tank, a feeding pump, an acid water discharging pump, a primary transmission pump, a secondary transmission pump, a primary light phase discharging pump, a secondary light phase discharging pump, a heavy phase discharging pump, a condensing unit, a vacuum unit, a heating unit, a console, a mobile phone end and a discharging pipe; a step is arranged at one end of a steel frame structure, a first-stage film evaporator, a second-stage film evaporator, a first-stage short-path molecular distiller and a second-stage short-path molecular distiller are sequentially arranged on the steel frame structure from left to right, a heavy-phase storage tank is arranged between the first-stage film evaporator and the second-stage film evaporator, the heavy-phase storage tanks are arranged on one sides of the first-stage short-path molecular distiller and the second-stage short-path molecular distiller, a feed pump is arranged on the steel frame structure on one side of the upper end of the first-stage film evaporator, a pipeline is arranged between a discharge port of the feed pump and a feed inlet of the first-stage film evaporator, a pipeline is arranged between a feed inlet of the feed pump and a discharge port of the material storage tank, acid water discharge pumps are arranged below slag outlets of the first-stage film evaporator and the second-stage film evaporator, and pipelines are arranged between feed inlets of the pair of the acid water discharge pumps and slag outlets of the first-stage film evaporator and the second-stage film evaporator respectively, a pipeline is arranged between a discharge port of the acid water discharge pump and the heavy phase storage tank, a discharge pipe is arranged at a discharge port of the heavy phase storage tank, a first-stage transmission pump and a second-stage transmission pump are respectively arranged below discharge ports of the first-stage film evaporator and the second-stage film evaporator, a pipeline is arranged between a feed port of the first-stage transmission pump and a discharge port of the first-stage film evaporator, a pipeline is arranged between a discharge port of the first-stage transmission pump and a feed port of the second-stage film evaporator, a pipeline is arranged between a discharge port of the second-stage transmission pump and a feed port of the first-stage short-path molecular distiller, a first-stage light phase discharge pump and a second-stage light phase discharge pump are respectively arranged below light phase outlets of the first-stage light phase discharge pump and the first-stage short-path molecular distiller, a pipeline is arranged between a discharge hole of the first-stage light-phase discharge pump and a feed hole of the second-stage short-range molecular distiller, a pipeline is arranged between a feed hole of the second-stage light-phase discharge pump and a light-phase outlet of the second-stage short-range molecular distiller, a discharge pipe is arranged at a discharge hole of the second-stage light-phase discharge pump, a heavy-phase discharge pump is arranged below the heavy-phase storage tank, a pipeline is arranged between a feed hole of the heavy-phase discharge pump and a discharge hole of the heavy-phase storage tank, a discharge pipe is arranged at a discharge hole of the heavy-phase discharge pump, a condensing unit, a vacuum unit and a heating unit are sequentially arranged on the rear side of the steel frame structure from left to right, the condensing unit, the vacuum unit, the heating unit and the first-stage film evaporator, the second-stage short-range molecular distiller respectively arranges pipelines, a control console is arranged on one side of the steel frame structure, and the control console is wirelessly connected with a mobile phone terminal.

The feeding pump adopts a variable frequency gear pump.

Starting a feed pump through a built-in program of a console or a mobile phone end, pumping lactic acid in a material storage tank into a primary film evaporator by the feed pump, carrying out primary film evaporation on the lactic acid in the primary film evaporator to remove most of water in the lactic acid, conveying the lactic acid subjected to the primary film evaporation into a secondary film evaporator by a primary conveying pump to carry out secondary film evaporation, continuously removing water, conveying acid water generated in the primary film evaporation and the secondary film evaporation to a heavy phase storage tank by an acid water discharge pump, conveying a light phase material subjected to the secondary film evaporation to a primary short-distance molecular distiller by a secondary conveying pump to carry out primary molecular distillation refining, conveying the lactic acid subjected to the primary distillation refining to a secondary short-distance molecular distiller by a primary light phase discharge pump to carry out secondary molecular distillation refining, and obtaining% medical grade refined lactic acid after the secondary molecular distillation refining, distillation residues generated in the primary molecular distillation refining process and the secondary molecular distillation refining process respectively enter corresponding heavy phase storage tanks through pipelines.

The invention has the beneficial effects that: the method is a full-continuous operation, and can realize the functions of dehydration and lactic acid refining by using 92% of high-purity lactic acid as a raw material through film evaporation, molecular distillation and molecular distillation four-stage distillation, so as to obtain 100% of medical-grade refined lactic acid; the invention is described in detail in the prior art.

Drawings

The invention will be further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of the assembly structure;

in the figure: the device comprises a steel frame structure 1, a step 2, a primary film evaporator 3, a secondary film evaporator 4, a primary short-range molecular distiller 5, a secondary short-range molecular distiller 6, a heavy phase storage tank 7, a feeding pump 8, an acid water discharging pump 9, a primary transfer pump 10, a secondary transfer pump 11, a primary light phase discharging pump 12, a secondary light phase discharging pump 12.1, a heavy phase discharging pump 13, a condensing unit 14, a vacuum unit 15, a heating unit 16, a control console 17, a mobile phone end 18 and a discharging pipe 19.

Detailed Description

The present invention will be described in further detail with reference to the following examples and embodiments:

example 1

A step 2 is arranged at one end of a steel frame structure 1, a first-stage film evaporator 3, a second-stage film evaporator 4, a first-stage short-range molecular distiller 5 and a second-stage short-range molecular distiller 6 are sequentially arranged on the steel frame structure 1 from left to right, a heavy phase storage tank 7 is arranged between the first-stage film evaporator 3 and the second-stage film evaporator 4, the heavy phase storage tank 7 is arranged on one side of each of the first-stage short-range molecular distiller 5 and the second-stage short-range molecular distiller 6, a feed pump 8 is arranged on the steel frame structure 1 on one side of the upper end of the first-stage film evaporator 3, a pipeline is arranged between a discharge port of the feed pump 8 and a feed inlet of the first-stage film evaporator 3, a pipeline is arranged between a feed inlet of the feed pump 8 and a discharge port of a material storage tank, acid water discharge pumps 9 are arranged below slag outlets of the first-stage film evaporator 3 and the second-stage film evaporator 4, and feed inlets of the acid water discharge pumps 9 are respectively connected with the first-stage film evaporator 3, A pipeline is arranged between slag material outlets of the second-stage film evaporator 4, a pipeline is arranged between a discharge port of the acid water discharge pump 9 and the heavy phase storage tank 7, a discharge pipe 19 is arranged at a discharge port of the heavy phase storage tank 7, a first-stage transmission pump 10 and a second-stage transmission pump 11 are respectively arranged below discharge ports of the first-stage film evaporator 3 and the second-stage film evaporator 4, a pipeline is arranged between a feed port of the first-stage transmission pump 10 and a discharge port of the first-stage film evaporator 3, a pipeline is arranged between a discharge port of the first-stage transmission pump 10 and a feed port of the second-stage film evaporator 4, a pipeline is arranged between a feed port of the second-stage transmission pump 11 and a feed port of the first-stage short-path molecular distiller 5, a first-stage light phase discharge pump 12 is respectively arranged below light phase outlets of the first-stage short-path molecular distiller 5 and the second-stage molecular distiller 6, A second-stage light phase discharging pump 12.1, a pipeline is arranged between a feed inlet of the first-stage light phase discharging pump 12 and a light phase outlet of the first-stage short-path molecular distiller 5, a pipeline is arranged between a discharge outlet of the first-stage light phase discharging pump 12 and a feed inlet of the second-stage short-path molecular distiller 6, a pipeline is arranged between a feed inlet of the second-stage light phase discharging pump 12.1 and a light phase outlet of the second-stage short-path molecular distiller 6, a discharge pipe 19 is arranged at a discharge outlet of the second-stage light phase discharging pump 12.1, a heavy phase discharging pump 13 is arranged below the heavy phase storage tank 7, a pipeline is arranged between a feed inlet of the heavy phase discharging pump 13 and a discharge outlet of the heavy phase storage tank 7, a discharge pipe 19 is arranged at a discharge outlet of the heavy phase discharging pump 13, a condensing unit 14, a vacuum unit 15, a heating unit 16, a first-stage thin film evaporator 3 and a second-stage thin film evaporator 4 are sequentially arranged at the rear side of the steel frame structure 1 from left to right, The first-stage short-range molecular distiller 5 and the second-stage short-range molecular distiller 6 are respectively provided with a pipeline, one side of the steel frame structure 1 is provided with a control console 17, and the control console 17 is wirelessly connected with the mobile phone end 18.

Example 2

The feeding pump 8 adopts a variable frequency gear pump.

Example 3

Starting a feed pump 8 through a built-in program of a console 17 or a mobile phone end 18, pumping lactic acid in a material storage tank into a primary film evaporator 3 by the feed pump 8, carrying out primary film evaporation on the lactic acid in the primary film evaporator 3 to remove most of water in the lactic acid, conveying the lactic acid subjected to the primary film evaporation into a secondary film evaporator 4 by a primary transmission pump 10 to carry out secondary film evaporation, continuously removing water, conveying acid water generated in the primary film evaporation and the secondary film evaporation into a heavy phase acid water storage tank 7 by a discharge pump 9, conveying a light phase material subjected to the secondary film evaporation to a primary short-path molecular distiller 5 by a secondary transmission pump 11 to carry out primary molecular distillation refining, conveying the lactic acid subjected to the primary distillation refining to a secondary short-path molecular distiller 6 by a primary light phase discharge pump 12 to carry out secondary molecular distillation refining, and obtaining 100% medical grade refined lactic acid after the secondary molecular distillation refining, distillation residues generated in the primary molecular distillation refining process and the secondary molecular distillation refining process respectively enter corresponding heavy phase storage tanks 7 through pipelines.