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Control method of acetaldehyde content during acetic acid synthesis from methanol carbonylation

A control method and chemical synthesis technology, which can be applied to the preparation of carboxylic acid by carbon monoxide reaction, organic chemistry and other directions, can solve the problems of polypropionic acid by-products and other problems, and achieve the effect of reducing losses

Inactive Publication Date: 2009-03-25
JIANGSU SOPO GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EP0,687,662 and U.S. Patent 5,625,095 proposed to control the reaction conditions to control the generation of acetaldehyde, but more propionic acid by-products were generated

Method used

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  • Control method of acetaldehyde content during acetic acid synthesis from methanol carbonylation
  • Control method of acetaldehyde content during acetic acid synthesis from methanol carbonylation
  • Control method of acetaldehyde content during acetic acid synthesis from methanol carbonylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition of the "light components" of the distillation sent to the distillation tower is:

[0028] Component Methanol Methyl iodide Methyl acetate Acetaldehyde acetic acid water content% 1～5 2～8 1～6 0.5～3 30～60 40～70

[0029] The distillation tower is 40 meters high, the tower diameter is 1 meter, the inside of the tower is stainless steel corrugated structured packing, the light component feed flow is 60L / h, the bottom temperature is 100℃, the top temperature is 30℃, the top pressure is 100KPa, reflux The ratio is 1:1. The material separation situation is as follows:

[0030]

[0031] Cool the temperature of the material to 5°C, add cooling water to the material in a ratio of 1:1, control the pressure of the extraction tower to 150KPa, and the composition of the material after extraction and separation is as follows:

[0032]

Embodiment 2

[0034] The composition of the "light components" for distillation sent to the distillation tower is:

[0035] Component Methanol Methyl iodide Methyl acetate Acetaldehyde acetic acid water content% 1～5 2～8 1～6 0.5～3 30～60 40～70

[0036] The distillation tower is 40 meters high, with a diameter of 1 meter. The inside of the tower is stainless steel corrugated structured packing. The light component feed flow rate is 30L / h. The tower bottom temperature is 95℃, the top temperature is 25℃, the top pressure is 50KPa, and the reflux ratio 3:1. The material separation is as follows:

[0037]

[0038] Cool the temperature of the material to 0°C, add cooling water to the material in a ratio of 1:1, and control the pressure of the extraction tower to 300KPa after extraction and separation. The material composition is as follows:

[0039]

[0040] The comparison of the above results shows that the technical scheme of the present invention can eff...

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Abstract

The invention provides a method for controlling the content of acetaldehyde in the synthesizing process of acetic acid by methanol carbonylation. The method comprises the steps: after flash evaporation of carbonylation materials, volatile phases are formed after the separation of a light component tower and condensed and separated to form 'light phases' and 'heavy phases', wherein, the 'light phases' are completely or partly led into a distillation tower for distillation, tower top distillates containing acetaldehyde and methyl iodide are obtained from the top of the tower, and tower bottom reflux substances containing methyl iodide, acetic acid and water are obtained form the bottom of the tower; and after condensation of the tower top distillates through a condenser, extraction is carried out by water, the extraction liquid containing acetaldehyde is discharged outside for independent treatment, and the faffinate and the tower bottom reflux substances are put back to a main reaction system to complete the procedures of follow-up processing with the left 'light phases'. The method can effectively control the content of acetaldehyde in the synthesizing process of the acetic acid by methanol carbonylation, reduce or remove compounds (PRC S) which deacidize hypermanganate, and reduce the loss of cocatalysts of methyl iodide and the like.

Description

Technical field [0001] The invention relates to a production process of methanol carbonylation to synthesize acetic acid, in particular to a method for controlling the content of the main reduction permanganate compound "acetaldehyde" in the process of methanol carbonylation to synthesize acetic acid, and belongs to the technical field of organic synthesis chemical engineering. Background technique [0002] Among the current industrial production methods of acetic acid, the most effective is the carbonylation of methanol and CO described in US Patent 3,769,329 issued to Paulik et al. on October 30, 1973. In US Patent No. 5,001,259 issued on March 19, 1991, 5,026,908 issued on June 25, 1991, 5,144,068 issued on September 1, 1992, and European Patent EP0,161,874B2 issued on July 1, 1992, disclosed In the presence of a rhodium catalyst, the carbonylation of alcohols is used to produce carboxylic acids with one more carbon atom than alcohols. [0003] These patents point out that whe...

Claims

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Application Information

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IPC IPC(8): C07C53/08C07C51/12
Inventor 宋勤华胡宗贵陈钢陆锡峰陈志林赵禄强周月荣
Owner JIANGSU SOPO GRP
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