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Method for separating acetone/DMF/water ternary system by rectifying through high- and low- pressure towers

A rectification separation and ternary system technology, applied in the separation/purification of carboxylic acid amides, separation/purification of carbonyl compounds, organic chemistry, etc., can solve problems affecting product quality, complex process flow, and increased separation costs, etc., to achieve The effect of improving product purity, simple process and reasonable device

Active Publication Date: 2015-08-19
高密市长丰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The defects and deficiencies in the above-mentioned existing separation technology are: the cost of the separation process is relatively high; the introduction of other substances in the system increases the separation cost and affects the product quality to a certain extent; the process is complicated and brings new The extractant regenerates the problem

Method used

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  • Method for separating acetone/DMF/water ternary system by rectifying through high- and low- pressure towers
  • Method for separating acetone/DMF/water ternary system by rectifying through high- and low- pressure towers
  • Method for separating acetone/DMF/water ternary system by rectifying through high- and low- pressure towers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Feed flow rate is 500kg / h, temperature is 15°C, pressure is 1atm (absolute pressure), mass composition: acetone 40%, DMF 30%, water 30%. The diameter of the atmospheric tower is 395 mm, the number of theoretical plates is 30, and the feed position is 22; the diameter of the vacuum tower is 443 mm, the number of theoretical plates is 25, and the feed is at the 15th block.

[0044] The operating process parameters of the double-tower rectification system are shown in Table 1.1, and the system feed and product logistics are shown in Table 1.2. As can be seen from the data in the table, the double-tower rectification method of the present invention is adopted. After separation: the acetone product has a purity of 99.5%, DMF The product purity reaches 99.9%; the yield of acetone reaches 99.9%, and the yield of water reaches 99.2%.

[0045] Table 1.1 Process and operating parameters of the double-column distillation system

[0046]

[0047] Table 1.2 Feed and product flow ...

Embodiment 2

[0050] Feed flow rate is 600kg / h, temperature is 25°C, pressure is 1atm (absolute pressure), mass composition: acetone 50%, DMF 20%, water 30%. The diameter of the atmospheric tower is 460 mm, the number of theoretical plates is 35, and the feed is at the 22nd block; the diameter of the vacuum tower is 680 mm, the number of theoretical plates is 35, and the feed is at the 20th block.

[0051] The operating process parameters of the double-column distillation system are shown in Table 2.1, and the system feed and product logistics are shown in Table 2.2. As can be seen from the data in the table, adopt the double-tower rectification method of the present invention, after separation: the acetone product purity reaches 99.6%, the DMF product purity reaches 99.9%, the water purity reaches 99.6%; the yield of acetone reaches 99.5%, the DMF The yield reaches 99.9%, and the yield of water reaches 99.5%.

[0052] Table 2.1 Process and operating parameters of the double-column distill...

Embodiment 3

[0057] The feed flow rate is 600kg / h, the temperature is 15°C, the pressure is 1atm (absolute pressure), the mass composition: acetone 60%, DMF 20%, water 20%; the diameter of the atmospheric column is 470mm, the number of theoretical plates is 33, and the 21st block Feeding: The diameter of the vacuum tower is 650mm, the number of theoretical plates is 30, and the feed is at the 20th block.

[0058] The operating process parameters of the double-tower rectification system are shown in Table 3.1, and the system feed and product logistics are shown in Table 3.2. It can be seen from the data in the table that the double-tower rectification method of the present invention is adopted. After separation: the acetone product has a purity of 99.6%, DMF The purity of the product reaches 99.9%, the purity of water reaches 99.4%, the yield of acetone reaches 99.5%, the yield of DMF reaches 99.9%, and the yield of water reaches 99.3%.

[0059] Table 3.1. Process and operating parameters o...

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Abstract

The invention relates to a rectifying device for separating an acetone / DMF / water ternary system by two towers and a method for separating the acetone / DMF / water ternary system by rectifying by using the device. The rectifying device mainly comprises a normal pressure tower, a reduced pressure tower, a pump, a return tank, a heat exchanger and the like. The rectifying and separating method comprises the following steps: feeding an acetone / DMF / water mixed solution into the normal pressure tower for primary rectification; extracting an acetone product from the tower top; and conveying a tower bottom material to the reduced pressure tower for secondary rectification; after a tower top steam material flow of the reduced pressure tower is condensed, returning part of materials to the reduced pressure tower; extracting water from the tower top; and extracting a DMF product from the tower bottom. By adopting the method provided by the invention, the cost of separating the acetone / DMF / water ternary system is lowered; the product purity and yield are improved; and the method is simple in process and feasible to operate, and can be applied to separating similar ternary systems.

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification of chemical industry, and relates to the separation of acetone / DMF / water ternary system, especially the separation of acetone / DMF / Water ternary system method. 【Background technique】 [0002] Dimethylformamide (DMF) is an important chemical raw material and a solvent with excellent performance. Dimethylformamide is not only a chemical raw material with a wide range of uses, but also an excellent solvent with a wide range of uses. Dimethylformamide is a good solvent for various high polymers such as polyethylene, polyvinyl chloride, polyacrylonitrile, polyamide, etc., and can be used for wet spinning of synthetic fibers such as polyacrylonitrile fibers and synthesis of polyurethane; It is used for making plastic films; it can also be used as a paint remover for removing paint; it can also dissolve some low-solubility pigments, making the pigments have the characteristics of dyes. Dime...

Claims

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Application Information

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IPC IPC(8): C07C45/82C07C49/08C07C231/24C07C233/03
CPCC07C45/82C07C231/24C07C49/08C07C233/03
Inventor 朱兆友王丽丽张震张青马艺心
Owner 高密市长丰化工有限公司
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