阅读说明：本技术 一种多品质双氧水提浓装置及其工艺和应用 (Multi-quality hydrogen peroxide concentration device and process and application thereof ) 是由 王东 袁甫荣 孙忠岩 段兆铎 马先波 韩恕秀 白立根 李红燕 于 2019-11-14 设计创作，主要内容包括：本发明属于双氧水提浓技术领域,尤其涉及一种多品质双氧水提浓装置及其工艺和应用,所述装置结构为：第一降膜蒸发器、第二降膜蒸发器分别安装在精馏塔的两侧,第一降膜蒸发器、第二降膜蒸发器均安装有两级分布器和喷头组成的三级布液装置,其中,两级分布器分别为均布盘、均布槽,均布槽底面设置出液孔,均布盘设置在降膜蒸发器顶部的进液管下方,均布槽设置在均布盘的下方；喷头设置在均布槽下方的固定板上,且喷头能够形成旋流均布于降膜蒸发器内的换热管内壁上,精馏塔内蒸汽进口上部设置有填料,精馏塔上部设置有溶剂进口。本发明利用双氧水的特点,并通过蒸发器配套精馏塔实现了同时生产化学级双氧水和工业级双氧水两种品质的产品。(The invention belongs to the technical field of hydrogen peroxide concentration, and particularly relates to a multi-quality hydrogen peroxide concentration device, a process and application thereof, wherein the device has the following structure: the first falling-film evaporator and the second falling-film evaporator are respectively arranged on two sides of the rectifying tower, and are respectively provided with a three-stage liquid distribution device consisting of a two-stage distributor and a spray head, wherein the two-stage distributor is respectively a uniform distribution disc and a uniform distribution groove, the bottom surface of the uniform distribution groove is provided with a liquid outlet hole, the uniform distribution disc is arranged below a liquid inlet pipe at the top of the falling-film evaporator, and the uniform distribution groove is arranged below the uniform distribution disc; the spray head is arranged on the fixing plate below the uniform distribution groove, the spray head can form rotational flow and is uniformly distributed on the inner wall of the heat exchange pipe in the falling film evaporator, the upper part of a steam inlet in the rectifying tower is provided with a filler, and the upper part of the rectifying tower is provided with a solvent inlet. The invention utilizes the characteristics of hydrogen peroxide and realizes the simultaneous production of two quality products of chemical hydrogen peroxide and industrial hydrogen peroxide by the matching of the evaporator and the rectifying tower.)

1. A multi-quality hydrogen peroxide concentration device is characterized by comprising: the device comprises a first falling-film evaporator, a second falling-film evaporator and a rectifying tower;

the first falling-film evaporator and the second falling-film evaporator are respectively arranged at two sides of the rectifying tower, steam outlets on the side walls of the lower parts of the first falling-film evaporator and the second falling-film evaporator are communicated with a steam inlet at the lower part of the rectifying tower, and a droplet separator is arranged in the communicating pipeline;

the first falling-film evaporator and the second falling-film evaporator are both provided with three-stage liquid distribution devices consisting of two-stage distributors and spray heads, wherein the two-stage distributors are respectively an even distribution disc and an even distribution groove, the bottom surface of the even distribution groove is provided with a liquid outlet hole, the even distribution disc is arranged below a liquid inlet pipe at the top of the falling-film evaporator, and the even distribution groove is arranged below the even distribution disc; the spray heads are arranged on the fixed plate below the uniform distribution grooves, liquid outlets of the spray heads are positioned in the ports of the heat exchange tubes and can form rotational flows of liquid to be uniformly distributed on the inner walls of the heat exchange tubes in the falling film evaporator, liquid inlets and liquid outlet holes of the spray heads are arranged in a staggered manner, and the fixed plate is connected with the inner walls of the falling film evaporator in a sealing manner;

and the upper part of the steam inlet in the rectifying tower is provided with a filler, and the upper part of the rectifying tower is provided with a solvent inlet.

2. The multi-quality hydrogen peroxide solution concentration device according to claim 1, wherein the spray head is a cylindrical structure rolled by an elastic plate, the side wall of the cylinder is in an open design, the opening penetrates through the whole side wall of the cylinder, one end of the opening extends into the cylinder, the other end of the opening extends out of the cylinder, and a gap is formed between the two ends in a normal state.

3. The multi-quality hydrogen peroxide solution concentration device according to claim 2, wherein one end of the opening extending into the cylinder is provided with a connecting table made of two simmer bending arcs with the bending radius of 2mm, and the connecting table is in close contact with the inner wall of the other end after being closed.

4. A multi-quality hydrogen peroxide concentration device as claimed in any one of claims 1 to 3, wherein the liquid inlet of the nozzle 6 is of a truncated cone structure, and one end with a larger diameter is hermetically connected with the liquid outlet hole.

5. The multi-quality hydrogen peroxide concentration device according to any one of claims 1 to 3, further comprising a preheater for preheating hydrogen peroxide to be concentrated, wherein the preheater is connected with the falling film evaporator;

alternatively, the concentration device further comprises a filter arranged before the preheater.

6. The multi-quality hydrogen peroxide concentration device according to any one of claims 1 to 3, wherein the droplet separator is a demister;

alternatively, the packing is stainless steel packing, preferably reinforced oblique corrugated regular stainless steel packing.

7. A multi-quality hydrogen peroxide concentration process is characterized by being implemented by adopting the multi-quality hydrogen peroxide concentration device of any one of claims 1 to 6, and comprising the following steps of:

(1) filtering hydrogen peroxide to be concentrated to remove impurities, and then pumping the hydrogen peroxide into a preheater for preheating;

(2) pumping the preheated hydrogen peroxide to be concentrated in the step (1) into a first falling-film evaporator and a second falling-film evaporator, uniformly distributing the hydrogen peroxide to be concentrated for the first time, then dropping the hydrogen peroxide into a uniform distribution groove from the edge of the uniform distribution plate, then entering a spray head from a liquid outlet hole on the bottom surface of the uniform distribution groove to form a rotational flow, uniformly distributing the rotational flow on the inner wall of a heat exchange pipe below to form a film-shaped flow, wherein part of water and the hydrogen peroxide are evaporated to form mixed steam, so that the non-evaporated hydrogen peroxide is concentrated, and the hydrogen peroxide falls into the bottom of the falling-film evaporator to form industrial-grade hydrogen peroxide;

(3) after the mixed steam in the step (2) enters a communication pipeline between the falling-film evaporator and the rectifying tower, impurities and fog drops in the mixed steam are separated out through a liquid drop separator, then the mixed steam enters the rectifying tower and is in countercurrent contact with a solvent entering the upper part of the rectifying tower on the surface of a filler, hydrogen peroxide is separated from the mixed steam through heat exchange and enters the solvent to form industrial-grade hydrogen peroxide, and finally the industrial-grade hydrogen peroxide falls into the bottom of the rectifying tower, and the evaporated solvent is evaporated from the top of the rectifying tower.

8. The multi-quality hydrogen peroxide concentration process according to claim 7, wherein the mass concentration of the hydrogen peroxide to be concentrated is not higher than 27.5%;

preferably, the mass concentration of the industrial-grade and chemical-grade hydrogen peroxide is not less than 50%.

9. The multi-quality hydrogen peroxide concentration process according to claim 7 or 8, wherein the temperature of the preheated hydrogen peroxide to be concentrated is 39-50 ℃.

10. Use of the multi-quality hydrogen peroxide concentration device according to any one of claims 1 to 3 and/or the concentration process according to any one of claims 7 to 9 in the field of chemical engineering.

Technical Field

The invention belongs to the technical field of hydrogen peroxide concentration, and particularly relates to a multi-quality hydrogen peroxide concentration device and a process and application thereof.

Background

The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

The technical bottleneck of single set of capacity of the traditional hydrogen peroxide concentration process of 50 percent hydrogen peroxide is mainly a falling film evaporator. For the falling film evaporator, the larger the diameter of the equipment is, the more uneven the liquid film distribution on the inner wall of the heat exchange tube of the evaporator is, thereby restricting the single set of capacity. According to the material characteristics that hydrogen peroxide is easy to decompose, the diameter of the evaporator is generally below 2000mm in order to ensure the operation safety of the device, and the larger the diameter is, the more serious the local overheating of hydrogen peroxide is, the uncontrollable decomposition of hydrogen peroxide is easy to cause, and safety accidents are easy to occur.

Disclosure of Invention

Aiming at the defects in the prior art, the invention mainly solves the problems that the diameter of a falling-film evaporator is too small due to the characteristic of materials which are easy to decompose according to hydrogen peroxide, so that the capacity of a single production device is insufficient, and the existing device cannot synchronously produce industrial-grade and chemical-grade hydrogen peroxide. Therefore, the invention provides a multi-quality hydrogen peroxide concentration device and a process and application thereof.

The invention aims to provide a multi-quality hydrogen peroxide concentration device.

The second purpose of the invention is to provide a multi-quality hydrogen peroxide concentration process.

The invention also aims to provide application of the multi-quality hydrogen peroxide concentration device.

In order to realize the purpose, the invention discloses the following technical scheme:

the invention discloses a multi-quality hydrogen peroxide concentration device which comprises a first falling-film evaporator, a second falling-film evaporator and a rectifying tower, wherein the first falling-film evaporator and the second falling-film evaporator are respectively arranged at two sides of the rectifying tower, steam outlets on the side walls of the lower parts of the first falling-film evaporator and the second falling-film evaporator are communicated with a steam inlet at the lower part of the rectifying tower, and a droplet separator is arranged in a communicating pipeline; the first falling-film evaporator and the second falling-film evaporator are both provided with three-stage liquid distribution devices consisting of two-stage distributors and spray heads, wherein the two-stage distributors are respectively an even distribution disc and an even distribution groove, the bottom surface of the even distribution groove is provided with a liquid outlet hole, the even distribution disc is arranged below a liquid inlet pipe at the top of the falling-film evaporator, and the even distribution groove is arranged below the even distribution disc; the spray heads are arranged on the fixed plate below the uniform distribution grooves, liquid outlets of the spray heads are positioned in the ports of the heat exchange tubes and can form rotational flows of liquid to be uniformly distributed on the inner walls of the heat exchange tubes in the falling film evaporator, liquid inlets and liquid outlet holes of the spray heads are arranged in a staggered manner, and the fixed plate is connected with the inner walls of the falling film evaporator in a sealing manner; and the upper part of the steam inlet in the rectifying tower is provided with a filler, and the upper part of the rectifying tower is provided with a solvent inlet.

Further, the concentration device also comprises a preheater for preheating hydrogen peroxide (with low concentration) to be concentrated, and the preheater is connected with the falling film evaporator.

Further, the concentration device also comprises a filter arranged in front of the preheater, and the concentration device is mainly used for filtering mechanical impurities in hydrogen peroxide to be concentrated and improving the product quality.

Further, the droplet separator is a demister, which mainly functions to separate droplets of insoluble suspended matter or part of impurities contained in hydrogen peroxide and water vapor (mixed steam) from the liquid, thereby avoiding affecting the product quality, and optionally, the demister is composed of corrugated plates arranged in parallel.

Furthermore, the filler is stainless steel filler, including reinforced oblique corrugated regular stainless steel filler and the like, and the preparation of industrial-grade hydrogen peroxide can be well realized in the rectifying tower through a reaction site provided by the filler.

Further, the shower nozzle is the cylindric structure of elastic plate system of rolling up, and the lateral wall of this drum is the open type design, the opening runs through the lateral wall of whole drum, open-ended one end extends to in the drum, and the other end extends to the drum outside, has the clearance between the both ends under the normal condition, but when receiving the extrusion of hydrogen peroxide solution in the drum, closely laminating between the both ends, the opening is sealed to closely contact between with the heat exchange tube inner wall, so that form the liquid film with hydrogen peroxide solution evenly distributed on the heat exchange tube inner wall.

Furthermore, one end of the opening extending into the cylinder is provided with a connecting table made of two simmer bending arcs with the bending radius of 2mm, and the connecting table is in close contact with the inner wall of the other end after being closed.

Furthermore, the liquid inlet of the spray head is of a cone frustum structure, and the lower bottom surface (namely the bottom surface with the larger diameter) of the spray head is connected with the liquid outlet hole in a sealing manner.

The invention further discloses a multi-quality hydrogen peroxide concentration process, which is carried out by adopting the concentration device and comprises the following steps:

(1) filtering the hydrogen peroxide to be concentrated to remove impurities, and then pumping the hydrogen peroxide into a preheater for preheating.

(2) Pumping the preheated hydrogen peroxide to be concentrated in the step (1) into a first falling-film evaporator and a second falling-film evaporator, firstly, distributing the hydrogen peroxide to be concentrated by an evenly-distributed disc for the first time, then, dropping the hydrogen peroxide into an evenly-distributed groove from the edge of the evenly-distributed disc, then, entering a spray head from a liquid outlet hole on the bottom surface of the evenly-distributed groove to form a rotational flow, evenly distributing the rotational flow on the inner wall of a heat exchange pipe below to form a film-shaped flow, wherein part of water and the hydrogen peroxide are evaporated to form mixed steam, so that the hydrogen peroxide which is not evaporated is concentrated, and then, dropping the hydrogen peroxide to.

(3) After the mixed steam in the step (2) enters a communication pipeline between the falling-film evaporator and the rectifying tower, impurities and fog drops in the mixed steam are separated out through a liquid drop separator, then the mixed steam enters the rectifying tower and is in countercurrent contact with a solvent entering the upper part of the rectifying tower on the surface of a filler, hydrogen peroxide is separated from the mixed steam through heat exchange and enters the solvent to form industrial-grade hydrogen peroxide, and finally the industrial-grade hydrogen peroxide falls into the bottom of the rectifying tower, and the evaporated solvent is evaporated from the top of the rectifying tower.

Further, the mass concentration of the hydrogen peroxide to be concentrated is not higher than 27.5%, and the mass concentration of the industrial-grade and chemical-grade hydrogen peroxide is not lower than 50%.

Further, the temperature of the preheated hydrogen peroxide to be concentrated is 39-50 ℃.

Finally, the invention discloses the multi-quality hydrogen peroxide concentration device and the application of the process thereof in the chemical field.

Compared with the prior art, the invention has the following beneficial effects:

(1) the whole device is designed into a symmetrical double-evaporator form, and the arrangement avoids the defect that the diameter is too large to influence the uniform distribution of liquid; and a three-stage liquid distribution device consisting of a two-stage distributor and a spray head is arranged on the evaporator, so that the technical barrier of the industry that the diameter of falling film evaporator equipment does not exceed 2000mm is broken through, the diameter of a single evaporator is successfully enlarged to 2400mm, and the industrial limit that the single set of capacity exceeds 8 ten thousand tons per year is realized.

(2) The concentration device of the invention utilizes the characteristics of hydrogen peroxide and realizes the simultaneous production of two quality products of chemical hydrogen peroxide and industrial hydrogen peroxide by matching the evaporator with the rectifying tower.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic structural diagram of a multi-quality hydrogen peroxide concentration device in an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a three-stage liquid distribution device in a falling film evaporator in the embodiment of the invention.

Fig. 3 is a schematic partial structural view of a showerhead according to an embodiment of the present invention.

The scores in the figure represent: 1-a first falling-film evaporator, 2-a second falling-film evaporator, 3-a rectifying tower, 4-a uniform distribution disc, 5-a uniform distribution groove, 6-a spray head, 7-a liquid outlet hole, 8-a liquid inlet pipe, 9-a fixed plate and 10-a gap.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The device aims to solve the problems that the diameter of a falling-film evaporator is too small due to the characteristic of materials which are easily decomposed according to hydrogen peroxide, so that the capacity of a single production device is insufficient, and the existing device cannot synchronously produce industrial-grade and chemical-grade hydrogen peroxide. Therefore, the invention provides a multi-quality hydrogen peroxide concentration device; the invention will now be further described with reference to specific embodiments.