CN211328201U

CN211328201U - High-efficient reaction rectifier unit of n butyl acetate

Info

Publication number: CN211328201U
Application number: CN201921943051.2U
Authority: CN
Inventors: 张超; 何晓芳; 卢晓峰; 宋仪川; 吴艳
Original assignee: Linyi Jinyimeng Biotechnology Co ltd
Current assignee: Linyi Jinyimeng Biotechnology Co ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-08-25
Anticipated expiration: 2029-11-12

Abstract

The utility model discloses a high-efficiency reaction rectifying device for n-butyl acetate, which comprises a plate tower, an esterification kettle, a reboiler, a condenser, a cooler and a phase splitter, wherein the esterification kettle and the reboiler are connected with each other through a pipeline and a pipe fitting and are connected with the plate tower, and the condenser, the cooler and the phase splitter are sequentially connected through the pipeline and the pipe fitting; the condenser is connected to the top of the plate tower through a pipeline; the phase separator is connected with a plate tower through a pipeline and a reflux pump, a reaction liquid circulating feed inlet is arranged on the plate tower and is connected with the esterification kettle through the pipeline and a reaction liquid circulating pump, and a tower middle extraction outlet and a reflux port are also arranged on the plate tower and are connected with a tower middle cooler through the pipeline. The device can effectively separate byproducts in the production process, reduces the alcohol content in reactants at the top of the tower to the minimum, and lightens the separation load of a subsequent system; the material circulation amount in the production process can be reduced, so that the purposes of saving energy, reducing consumption and increasing productivity are achieved.

Description

High-efficient reaction rectifier unit of n butyl acetate

Technical Field

The utility model relates to a chemical industry equipment technical field especially relates to a high-efficient reaction rectifier unit of n butyl acetate.

Background

In chemical production, n-butyl acetate is usually produced by a continuous esterification method, namely raw materials of acetic acid and n-butyl alcohol are subjected to esterification reaction in a strong acid homogeneous catalyst at a certain temperature and under a certain pressure, a reaction product is primarily separated by an esterification tower to obtain a crude ester semi-finished product, and the crude ester semi-finished product is separated by a dehydration tower to obtain an n-butyl acetate product. The traditional esterification method production device adopts a ceramic packed tower as an esterification tower, so that the reaction system has the following problems: 1. as strong acid is used as a catalyst in the esterification reaction, the strong oxidizing property of the strong acid is easy to cause side reactions such as sulfonation, carbonization and the like, so that the pollution of a reaction system in chemical production is fast, the cleaning period is frequent, and the ceramic filler is washed and corroded, so that the rectification effect is easily reduced; 2. in the traditional esterification reaction-rectification process using a ceramic packed tower as an esterification tower, because the conversion rate of n-butanol is low, the alcohol content at the top of the ceramic packed tower is high, so that the n-butanol which is not completely reacted is brought into a subsequent separation system, and the alcohol which is not completely reacted needs to be separated and then enters a reaction system again to participate in the esterification reaction, thus increasing the energy consumption of the reaction and separation system in the esterification reaction process. 3. The reflux amount of the ortho-esterification system is large, so that the energy consumption is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high-efficient reaction rectifier unit of n-butyl acetate for solve the equipment corrosion that exists among the above-mentioned synthetic n-butyl acetate device of esterification method serious, the rectification effect is poor, the backward flow is bigger, the n-butanol conversion rate is low and the high problem of energy consumption.

The utility model provides a following technical scheme:

an efficient reaction rectifying device for n-butyl acetate comprises a plate tower, an esterification kettle, a reboiler, a condenser, a cooler and a phase separator, wherein the esterification kettle and the reboiler are connected with each other through a pipeline and a pipe fitting and are connected with the plate tower, and the condenser, the cooler and the phase separator are sequentially connected through the pipeline and the pipe fitting; the condenser is connected to the top of the plate tower through a pipeline; the phase separator is connected with a plate tower through a pipeline and a reflux pump, a reaction liquid circulating feed inlet is arranged on the plate tower and is connected with the esterification kettle through the pipeline and a reaction liquid circulating pump, and a tower middle extraction outlet and a reflux port are also arranged on the plate tower and are connected with a tower middle cooler through the pipeline.

The preferred scheme of the high-efficiency reaction rectifying device for the n-butyl acetate is that the reaction liquid circulating feed inlet is positioned at the middle lower part of the plate tower.

A preferred scheme of the n-butyl acetate efficient reaction rectifying device is that a middle extraction opening of a tower is positioned in the middle of a plate tower, so that liquid in the tower is extracted, cooled by a cooler, passes through a potential difference, naturally overflows and then returns to two layers of tower plates below the middle extraction opening of the tower.

The preferred scheme of the high-efficiency reaction rectifying device for the n-butyl acetate is that the phase separator is connected with a water phase extraction tank and an ester phase reflux tank through pipelines.

A high-efficiency reaction rectifying device for n-butyl acetate is characterized in that materials at the top of a tower are subjected to phase separation by a phase separator, and a bottom water phase enters a water phase extraction tank and then is extracted to a waste water tank; the upper ester phase enters an ester phase reflux tank, then partially reflows through a reflux pump, and part of the ester phase is taken as crude ester to be extracted.

The beneficial effects of the utility model are embodied in:

(1) the device provided by the utility model can effectively separate the by-products in the production process, and reduce the alcohol content in the reactants at the top of the tower to the minimum, thereby reducing the separation load of the subsequent system;

(2) the utility model can reduce the material circulation in the production process, so as to achieve the purposes of saving energy, reducing consumption and increasing productivity;

(3) the utility model can effectively reduce the cleaning frequency of the reaction system, and the pollution of the reaction system is slow;

(4) the utility model discloses can effectively reduce top of the tower reflux ratio.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which like reference numerals refer to like features throughout, and in which:

FIG. 1 is a schematic diagram of the high-efficiency reactive distillation apparatus of the present invention.

Fig. 2 is a partially enlarged view of fig. 1.

In the figure: 1. an esterification kettle; 2. a reboiler; 3. a condenser; 4. a cooler; 5. a phase splitter; 6. a cooler in the column; 7. a reflux pump; 8. a reaction liquid circulating pump; 9. a plate column.

Detailed Description

The technical solutions described in the present application are further described below with reference to the accompanying drawings and embodiments. It should be noted that the following paragraphs may refer to terms of orientation including, but not limited to, "upper, lower, left, right, front, rear", etc., which are based on the orientation shown in the drawings corresponding to the specification, and should not be construed as limiting the scope or technical solutions of the present application, but merely as facilitating better understanding of the technical solutions described in the present application by those skilled in the art.

Embodiment 1 referring to fig. 1, an n-butyl acetate high-efficiency reactive distillation device comprises a tray column 9, an esterification kettle 1, a reboiler 2, a condenser 3, a cooler 4 and a phase separator 5, wherein the esterification kettle 1 and the reboiler 2 are connected with each other through a pipeline and a pipe fitting and are connected with the tray column 9, and the condenser 3, the cooler 4 and the phase separator 5 are sequentially connected through a pipeline and a pipe fitting; the condenser 3 is connected to the top of the plate tower 9 through a pipeline; the phase separator 5 is connected with a plate tower 9 through a pipeline and a reflux pump 7, a reaction liquid circulating feed inlet is arranged on the plate tower 9 and is connected with the esterification kettle 1 through a pipeline and a reaction liquid circulating pump 8, and a tower middle extraction outlet and a reflux opening are also arranged on the plate tower 9 and are connected with a tower middle cooler 6 through a pipeline.

Specifically, the reaction liquid circulation feed inlet is positioned at the middle lower part of the plate tower 9. The extraction outlet in the tower is positioned in the middle of the plate tower 9, so that liquid in the tower is extracted, cooled by the cooler 6 in the tower, and naturally overflows through the potential difference and then returns to two layers of tower plates below the extraction outlet in the tower.

Wherein, the phase separator 5 is connected with a water phase extraction tank and an ester phase reflux tank through pipelines; after the materials at the top of the tower are subjected to phase splitting by the phase splitter 5, the bottom water phase enters a water phase extraction tank and then is extracted to a wastewater tank; the upper ester phase enters an ester phase reflux tank, then partially reflows through a reflux pump 7, and part of the ester phase is taken as crude ester to be extracted.

When the utility model is used, raw materials of acetic acid and n-butyl alcohol are added into a reaction kettle according to a certain proportion, and react in the reaction kettle under the condition of steam heating, and the generated products are n-butyl acetate and water; ester, water and alcohol ternary azeotrope or ester and water binary azeotrope is rectified in a plate tower 9 to obtain a crude ester semi-finished product with low water, alcohol and acid content from the top of the plate tower 9. The reaction liquid circulating feed inlet positioned at the middle lower part of the plate tower 9 enables the catalyst in the reaction liquid to enter the middle lower part of the plate tower and reversely contact with n-butyl alcohol and acetic acid which are not completely reacted, further reaction enables the alcohol content in the n-butyl acetate reaction product to be reduced to the minimum, the reaction conversion rate is improved, the effect is improved, the separation burden of a system is reduced, the material circulating amount in the production process is reduced, and the purposes of saving energy, reducing consumption and improving productivity are achieved.

The utility model discloses when using, draw intraductal liquid material in the tower to the tower in cooler 6 cools off, the material after the cooling passes through the position difference, on the two-layer column plate under the extraction outlet that the natural overflow returned in the tower again. The purpose of reducing the reflux quantity at the top of the tower and improving the productivity is achieved.

Use the utility model discloses afterwards, the mellow wine content in the crude ester semi-manufactured goods that the top generated at plate tower is less than 1%, and the time of equipment use and maintenance cycle are obvious improvement than original traditional equipment to the cost of production has been reduced, the efficiency of production has been improved.

It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by a person skilled in the art without any inventive work based on the above-mentioned embodiments of the present invention shall fall within the scope of the protection of the present invention.

Claims

1. A high-efficiency reaction rectifying device for n-butyl acetate comprises a plate tower, an esterification kettle, a reboiler, a condenser, a cooler and a phase separator, and is characterized in that the esterification kettle and the reboiler are connected with each other through a pipeline and a pipe fitting and are connected with the plate tower, and the condenser, the cooler and the phase separator are sequentially connected through a pipeline and a pipe fitting; the condenser is connected to the top of the plate tower through a pipeline; the phase separator is connected with a plate tower through a pipeline and a reflux pump, a reaction liquid circulating feed inlet is arranged on the plate tower and is connected with the esterification kettle through the pipeline and a reaction liquid circulating pump, and a tower middle extraction outlet and a reflux port are also arranged on the plate tower and are connected with a tower middle cooler through the pipeline.

2. The efficient reaction rectifying device for n-butyl acetate according to claim 1, wherein the circulating feed inlet of the reaction liquid is positioned at the middle lower part of the plate tower.

3. The efficient reaction and rectification device for n-butyl acetate as claimed in claim 1, wherein the extraction port in the tower is located in the middle of the plate-type tower, so that liquid in the tower is extracted, cooled by a cooler, and naturally overflows through a head and then returns to two layers of tower plates below the extraction port in the tower.

4. The efficient reaction rectifying device for n-butyl acetate according to claim 1, wherein the phase separator is connected with the aqueous phase extraction tank and the ester phase reflux tank through pipelines.

5. The efficient reaction and rectification device for n-butyl acetate as claimed in claim 4, wherein after the phase separation of the material at the top of the column by the phase separator, the bottom aqueous phase enters the aqueous phase extraction tank and is extracted into the wastewater tank; the upper ester phase enters an ester phase reflux tank, then partially reflows through a reflux pump, and part of the ester phase is taken as crude ester to be extracted.