CN217511220U

CN217511220U - Device for separating and recovering extracted material of MIBK light component tower

Info

Publication number: CN217511220U
Application number: CN202221624820.4U
Authority: CN
Inventors: 郑金成; 周文斌; 沈曙光; 吴尔旭; 叶阳阳; 赵洪彬; 章晓麟
Original assignee: Zhejiang Zhenyang Development Co ltd
Current assignee: Zhejiang Zhenyang Development Co ltd
Priority date: 2022-06-27
Filing date: 2022-06-27
Publication date: 2022-09-30
Anticipated expiration: 2032-06-27

Abstract

The application relates to a device for separating and recovering extracted materials of a MIBK light component tower, which comprises a coarse dehydration component for coarse dehydration, a fine dehydration component for fine dehydration and a rectification component for separating materials; the coarse dehydration component comprises a coarse dehydration tank, and an absorbent is filled in the coarse dehydration tank; the fine dehydration component comprises a pervaporation membrane group which is communicated with the coarse dehydration tank; the rectifying component comprises a rectifying tower, a condenser arranged at the top of the rectifying tower and a reboiler arranged at the bottom of the rectifying tower, and the rectifying tower is communicated with the pervaporation membrane group. The method has the advantages of high dehydration efficiency and high purity of the separated product.

Description

Device for separating and recovering extracted material of MIBK light component tower

Technical Field

The application relates to the technical field of MIBK rectification separation, in particular to a device for separating and recovering extracted materials of a MIBK light component tower.

Background

Methyl isobutyl ketone (MIBK) is an excellent medium-boiling point solvent and an important organic chemical product, and is mainly applied to the fields of agriculture, medicines, coatings, surfactants and the like. Currently, there are three-step and one-step processes for the industrial synthesis of MIBK using acetone. The one-step process is to generate MIBK through three reactions of condensation, dehydration and hydrogenation simultaneously under the asynchronous synergistic action of a multifunctional catalyst, and has the advantages of simple process flow, low product cost and the like, so that the one-step process becomes the mainstream process of MIBK production at present, and domestic devices basically adopt the one-step process as the production process.

The MIBK production process is generally provided with a MIBK light component tower, a byproduct KB-3 is produced, and the fuel oil is often sold cheaply. The main components of KB-3 are acetone, MIBK, isopropanol and water, and the material contains a large amount of recyclable substances, so that separation can be performed step by distillation theoretically.

Of the four, acetone has the lowest boiling point and can be separated first, while the remaining three substances, isopropanol and water, and MIBK and water, form an azeotropic system, wherein the azeotropic point of IPA and water is 80.3 ℃, and the azeotropic point of MIBK and water is 87.9 ℃. It can be seen that the material can be separated by removing water in the material and then purifying the isopropanol with high content by a rectification mode, and simultaneously, the acetone and the MIBK can be recovered to reduce the unit consumption of the MIBK.

At present, technicians usually adopt an extractive distillation method, firstly, an acetone component is distilled, then, glycol and the like are used as an extracting agent to remove water in materials, then, the glycol is recycled and reused through a rectifying tower, and finally, isopropanol and MIBK are separated through the rectifying tower. The method uses glycol and the like as the extractant for rectification, and has relatively high operation cost. In addition, the separation is realized by additionally adding the byproduct isopropanol and removing the water in the MIBK through three-phase azeotropy, and although the water in the MIBK is removed, the energy consumption for subsequent separation of the isopropanol is increased.

In view of the above-mentioned related art, the inventors believe that the dehydration efficiency is low and the production cost is high when the separated MIBK light component column is taken out.

SUMMERY OF THE UTILITY MODEL

In order to promote the dehydration efficiency and the separation product purity of the light component tower extraction material of MIBK of separation recovery, this application provides a device for separating the light component tower extraction material of MIBK of recovery.

The application provides a device for separating recovery MIBK light component tower extraction material adopts following technical scheme:

a device for separating and recovering a collected material of a MIBK light component tower comprises a rough dehydration component for rough dehydration, a fine dehydration component for fine dehydration and a rectification component for separating materials;

the coarse dehydration assembly comprises a coarse dehydration tank, and an absorbent is filled in the coarse dehydration tank;

the fine dehydration assembly comprises a pervaporation membrane group, and the pervaporation membrane group is communicated with the coarse dehydration tank;

the rectifying component comprises a rectifying tower, a condenser arranged at the top of the rectifying tower and a reboiler arranged at the bottom of the rectifying tower, and the rectifying tower is communicated with the pervaporation membrane group.

By adopting the technical scheme, the extracted material of the MIBK light component tower is firstly reacted with the absorbent in the coarse dehydration tank, and a coarse dehydration product and an absorbent reactant are obtained after a large part of water is removed. And then the crude dehydration product is further dehydrated through a pervaporation membrane group to obtain a fine dehydration product with the moisture content of less than 0.2 percent and separated water. In addition, the absorbent can release a large amount of reaction heat while absorbing water, so that the crude dehydration product can be preheated, and the heat energy consumption of the pervaporation membrane module is reduced. And finally, conveying the refined dehydration product into a rectifying tower for rectification and separation to finally obtain acetone, isopropanol and MIBK separation products with higher purity respectively, and the method has the advantages of high dehydration efficiency and low production cost.

Optionally, the coarse dehydration tank is communicated with a dehydrating agent tank, and an absorbent is stored in the dehydrating agent tank.

Through adopting above-mentioned technical scheme, can circulate some absorbent reactant in the coarse dehydration jar to the dehydrating agent jar again, can carry again and carry out dehydration in the coarse dehydration jar after mixing with the absorbent, can effectively improve the utilization ratio of absorbent, practice thrift manufacturing cost.

Optionally, the coarse dehydration tank is communicated with a water washing tank, and the water washing tank is filled with water.

Through adopting above-mentioned technical scheme, can carry the absorbent reactant of the remaining part in the thick dehydration jar to the rinsing jar, make alkali lye after fully reacting with water, make things convenient for subsequent recycle, more green.

Optionally, the water washing tank is communicated with a water inlet pipeline.

By adopting the technical scheme, the water inlet pipeline can timely supplement fresh water to the water washing tank, the reactant of the absorbent can fully react with water, alkali liquor with different concentrations can be obtained by adjusting the water inflow, the alkali liquor with high concentration can be used for an organic reaction unit requiring an alkali environment, the alkali liquor with low concentration can be used for a hydrolysis reaction unit, and the comprehensive production cost is further reduced.

Optionally, the water washing tank is communicated with the pervaporation membrane module.

Through adopting above-mentioned technical scheme, can carry the separation water that pervaporation membrane group produced to the use in the wash bowl, reduce fresh water's use amount, water economy resource and manufacturing cost.

Optionally, the water washing tank is communicated with an ECH saponification tower.

By adopting the technical scheme, the alkali liquor can be conveyed to the ECH saponification tower for use, so that an alkaline material is provided for the cyclization reaction of HCl removal, the comprehensive utilization rate of the absorbent is further improved, and the green production concept is met.

Optionally, the pervaporation membrane group is composed of 2-4 pervaporation membranes connected in series.

By adopting the technical scheme, the number of the pervaporation membranes is optimized and adjusted, and the relation between the production cost and the dehydration efficiency is further balanced.

Optionally, a coarse dehydration discharge pipeline is communicated between the pervaporation membrane group and the coarse dehydration tank, and a filter is arranged on the coarse dehydration discharge pipeline.

By adopting the technical scheme, the filter can filter impurities such as absorbent particles and the like possibly contained in the coarse dehydration product, reduce the probability of blockage of the pervaporation membrane module and maintain the normal operation of the fine dehydration component.

Optionally, a refined dehydration discharge pipeline is communicated between the rectifying tower and the pervaporation membrane group, and a moisture meter is arranged on the refined dehydration discharge pipeline.

By adopting the technical scheme, the moisture meter can monitor the water content of the refined dehydration product entering the rectifying tower, and the condition of purity reduction of the separation product caused by the phenomenon of unqualified water content when the pervaporation membrane group dehydration process fluctuates is reduced.

Optionally, 10-20 sieve plates are arranged in the rectifying tower.

By adopting the technical scheme, the number of the sieve plates in the rectifying tower is optimized and adjusted, the relation between the energy consumption required by rectification and the purity of the separated product is further balanced, and the comprehensive economic benefit is improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by combining the chemical dehydration process and the material dehydration process, the dehydration efficiency is improved, and the production cost is reduced, so that better economic benefit is obtained.

2. Through comprehensive utilization of the absorbent, all process units are organically combined, the comprehensive utilization rate of production raw materials is improved, and the production concept of green chemical industry is met.

Drawings

Fig. 1 is an overall schematic diagram of an embodiment of the present application.

Description of reference numerals: 1. a buffer tank; 2. a dehydrating agent tank; 3. a coarse dewatering component; 31. a coarse dehydration tank; 32. a return line; 33. a coarse dehydration discharge pipeline; 34. a recovery pipeline; 4. a filter; 5. a water washing tank; 51. a water inlet pipe; 52. an alkali liquor pipeline; 6. a fine dehydration component; 61. a pervaporation membrane module; 62. a fine dehydration discharge pipeline; 63. a separation water pipeline; 7. a rectification component; 71. a rectifying tower; 72. a condenser; 73. a reboiler; 8. an ECH saponification column.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

The embodiment of the application discloses a device for separating and recovering MIBK light component tower extraction material can be used for carrying out dehydration, rectification separation operation to MIBK light component tower extraction material, obtains products such as acetone, isopropanol, MIBK, realizes waste recycling, low in production cost, and comprehensive benefit is good.

The extracted material of the MIBK light component tower of the embodiment of the application is from waste materials in the MIBK synthesis process, and the extracted material of the MIBK light component tower mainly comprises four components of water, acetone, isopropanol and MIBK, wherein the water accounts for about 15%, the acetone accounts for about 10%, the isopropanol accounts for about 50%, and the MIBK accounts for about 25%. Moreover, according to the process adjustment in the actual synthesis production process of MIBK, the proportion of the four components is changed, and the device for separating and recovering the extracted material of the MIBK light component tower can meet the requirements of dehydration and separation.

Referring to fig. 1, the device for separating and recovering the extracted material of the MIBK light component tower comprises a coarse dehydration component 3, a fine dehydration component 6 and a rectification component 7, wherein the coarse dehydration component 3 performs coarse dehydration on the extracted material of the MIBK light component tower, a coarse dehydration product is obtained after most of moisture is removed, then the coarse dehydration product is further dehydrated through the fine dehydration component 6, a fine dehydration product with the water content of less than 0.2% is obtained, and then the fine dehydration product is sequentially rectified through the rectification component 7 to obtain acetone, isopropanol and MIBK, so that the materials are separated and recovered, and the comprehensive economic benefit is improved.

Referring to fig. 1, the coarse dewatering assembly 3 comprises a coarse dewatering tank 31, and a return line 32, a coarse dewatering discharge line 33 and a recovery line 34 all communicating with the coarse dewatering tank 31. The coarse dehydration tank 31 is communicated with a buffer tank 1 and a dehydrating agent tank 2, the MIBK light component tower extracted material is stored in the buffer tank 1, and the MIBK light component tower extracted material can be conveyed to the coarse dehydration tank 31 through a pump piece at any time for coarse dehydration operation. The absorbent is stored in the dehydrating agent tank 2, and is conveyed into the coarse dehydrating tank 31 through a pump piece, and the absorbent and the extracted material of the MIBK light component tower perform water absorption reaction, so that most of water in the extracted material component of the MIBK light component tower can be dehydrated. The absorbent in this application may be a solid base such as calcium oxide, sodium hydroxide, potassium hydroxide, and the like; solid alkali metal salts such as calcium carbonate, potassium bicarbonate, sodium bicarbonate, etc. are also possible, with calcium oxide being the preferred absorbent in this embodiment.

With continued reference to fig. 1, after the absorbent and the extracted material of the MIBK light component tower are subjected to water absorption reaction, a solid absorbent reactant and a liquid crude dehydration product are obtained, meanwhile, the crude dehydration product is preheated by reaction heat generated by water absorption of the absorbent, and the preheated crude dehydration product is discharged through a crude dehydration discharge pipe for standby. And, the return line 32 is communicated with the dehydrating agent tank 2, a part of absorbent in the absorbent reactant can be present and does not react completely, and at this time, a part of the absorbent reactant is returned again through the return line 32 and circulated into the dehydrating agent tank 2, so that the recycling is convenient and the production cost is saved. In addition, the recovery pipeline 34 is communicated with the water washing tank 5, water is filled in the water washing tank 5, and the residual absorbent reactant is conveyed into the water washing tank 5 through the recovery pipeline 34 and then fully reacts with the water to generate alkali liquor. The water washing pipe is communicated with an alkali liquor pipeline 52 so that the alkali liquor can be recycled, the alkali liquor can be used for an organic reaction unit needing alkali in the embodiment, and preferably, the embodiment is provided with the ECH saponification tower 8, the alkali liquor is used for the ECH saponification tower 8, so that the production cost can be further saved, and the green production concept is met.

Referring to fig. 1, the fine dehydration module 6 includes a pervaporation membrane module 61, a fine dehydration discharge pipeline 62 communicated with the pervaporation membrane module 61, and a separation water pipeline 63, where the pervaporation membrane module 61 is formed by connecting 2-4 pervaporation membranes in series, and in the embodiment of the present application, it is preferable to connect 3 pervaporation membranes in series. The pervaporation membrane group 61 is communicated with the rough dehydration discharging pipeline 33, preheated rough dehydration products are conveyed into the pervaporation membrane group 61 through a pump component, energy consumption of a heating component in the pervaporation membrane group 61 is reduced, then water is further dehydrated through a pervaporation process to obtain refined dehydration products and separation water, the refined dehydration products are discharged through a refined dehydration discharging pipeline 62 for standby, and after dehydration is carried out by utilizing the pervaporation membrane group 61, subsequent rectification operation is facilitated.

Referring to fig. 1, the rectification assembly 7 includes a rectification column 71, a condenser 72 disposed at the top of the rectification column 71, and a reboiler 73 disposed at the bottom of the rectification column 71, wherein 10 to 20 sieve plates are disposed in the rectification column 71 for separating materials, and preferably 15 sieve plates are disposed in this embodiment. A condensing reflux pipeline is communicated between the condenser 72 and the rectifying tower 71 and is used for providing condensed water for the rectifying tower 71 so as to condense and extract the material components. A reboiling pipeline is communicated between the reboiler 73 and the rectifying tower 71 to provide heat energy for the rectifying tower 71, so that the material is heated to a proper temperature, and the material components are conveniently separated. In addition, a condensation reflux outlet, an acetone and isopropanol extraction outlet are arranged at the top of the rectifying tower 71, a reboiling reflux outlet and an MIBK extraction outlet are arranged at the bottom of the rectifying tower 71, wherein the acetone, isopropanol and MIBK extraction outlets are convenient for extraction of each component separation material, and the condensation reflux and reboiling reflux extraction outlets can be used for workers to detect the rectifying state in the rectifying tower so as to adjust the rectifying process parameters.

In the embodiment, the temperature of the tower top is adjusted to 65-80 ℃, and acetone components are extracted from an acetone extraction port at the tower top; then adjusting the temperature of the tower top to 85-110 ℃, and extracting an isopropanol component from an isopropanol extraction port at the tower top; and finally, the tower kettle material is extracted from the MIBK extraction outlet at the bottom of the tower to obtain a crude MIBK component, so that the separation and recovery of each material component are realized, the purity of the product is higher, and the comprehensive economic benefit is better.

Referring to fig. 1, in order to further reduce the production cost, a separated water pipeline 63 is communicated with the water washing tank 5, the separated water generated in the pervaporation process can be conveyed into the water washing tank 5 for use, and the rest water can be supplemented from fresh water through the water inlet pipeline 51, so that the water resource can be saved.

Referring to fig. 1, the coarse dehydration discharging pipeline 33 is communicated with a filter 4, and particulate impurities in the coarse dehydration product are filtered by the filter 4, so that the blocking probability of the pervaporation membrane group 61 is reduced, and the normal operation of production activities is ensured. In addition, the fine dehydration discharge pipeline 62 is provided with a moisture meter which can detect the water content of the fine dehydration product and ensure that the water content before entering the rectifying tower 71 is lower than 0.2 percent so as to ensure the normal operation of the rectifying operation and the purity of the separation product.

The implementation principle of the device for separating and recovering the extracted material of the MIBK light component tower is as follows: moisture in the extracted material of the MIBK light component tower is removed in sequence through the rough dehydration component 3 and the fine dehydration component 6, so that the water content is reduced to be below 0.2%, and the dehydration efficiency is very high. After separation by the rectifying component 7, the acetone, isopropanol and MIBK products with higher purity can be obtained, and the comprehensive economic benefit is better. In addition, in the course of coarse dehydration, the recycling of the absorbent is realized, a part of water resources are saved, and the production cost is further reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a device that is used for separating recovery MIBK light component tower extraction material which characterized in that: comprises a rough dehydration component (3) for rough dehydration, a fine dehydration component (6) for fine dehydration and a rectification component (7) for separating materials;

the rough dehydration component (3) comprises a rough dehydration tank (31), and an absorbent is filled in the rough dehydration tank (31);

the fine dehydration assembly (6) comprises a pervaporation membrane group (61), and the pervaporation membrane group (61) is communicated with the coarse dehydration tank (31);

the rectifying component (7) comprises a rectifying tower (71), a condenser (72) arranged at the top of the rectifying tower (71) and a reboiler (73) arranged at the bottom of the rectifying tower (71), and the rectifying tower (71) is communicated with the pervaporation membrane group (61).

2. The apparatus for separating and recovering a column distillate of MIBK light components as claimed in claim 1, wherein: the coarse dehydration tank (31) is communicated with a dehydrating agent tank (2), and an absorbent is stored in the dehydrating agent tank (2).

3. The apparatus for separating and recovering a column distillate of MIBK light components as claimed in claim 2, wherein: the coarse dehydration tank (31) is communicated with a water washing tank (5), and water is filled in the water washing tank (5).

4. The apparatus for separating and recovering a withdrawn stream from a column of MIBK light components as claimed in claim 3, wherein: the washing tank (5) is communicated with a water inlet pipeline (51).

5. The apparatus for separating and recovering a withdrawn stream from a column of MIBK light components as claimed in claim 3, wherein: the water washing tank (5) is communicated with the pervaporation membrane group (61).

6. The apparatus for separating and recovering a withdrawn stream from a column of MIBK light components as claimed in claim 3, wherein: the water washing tank (5) is communicated with an ECH saponification tower (8).

7. The apparatus for separating and recovering a column distillate of MIBK light components as claimed in claim 1, wherein: the pervaporation membrane group (61) is formed by connecting 2-4 pervaporation membranes in series.

8. The apparatus for separating and recovering the withdrawn product of the MIBK light components column as claimed in claim 1, wherein: a coarse dehydration discharge pipeline (33) is communicated between the pervaporation membrane group (61) and the coarse dehydration tank (31), and a filter (4) is arranged on the coarse dehydration discharge pipeline (33).

9. The apparatus for separating and recovering a column distillate of MIBK light components as claimed in claim 1, wherein: a refined dehydration discharge pipeline (62) is communicated between the rectifying tower (71) and the pervaporation membrane group (61), and a moisture meter is arranged on the refined dehydration discharge pipeline (62).

10. The apparatus for separating and recovering a column distillate of MIBK light components as claimed in claim 1, wherein: 10-20 sieve plates are arranged in the rectifying tower (71).