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Method for separating and extracting acetic acid and propanoic acid from waste acetic acid produced from methanol low pressure carbonyl method

A technology of low-pressure carbonyl method and waste acetic acid, which is applied in the separation/purification of carboxylic acid compounds, the preparation of carboxylic acid by carbon monoxide reaction, organic chemistry, etc., which can solve the problems of resource waste and increase product cost, and achieve low cost and reduce resource waste And environmental pollution, the effect of simple operation process

Active Publication Date: 2007-07-11
SHANGHAI HUAYI ENERGY CHEM
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Problems solved by technology

The incineration technology of using an incinerator to incinerate the waste acid produced in the production of acetic acid can eliminate environmental pollution, but it will inevitably cause waste of resources and increase product costs.
[0006] At present, there is no relevant report on the method of producing acetic acid by rectification to process carbonylation reaction, and the separation and extraction of waste acid can be commercially available with high-concentration acetic acid and high-concentration propionic acid, and the recovery rate is 70% to 99%.

Method used

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  • Method for separating and extracting acetic acid and propanoic acid from waste acetic acid produced from methanol low pressure carbonyl method
  • Method for separating and extracting acetic acid and propanoic acid from waste acetic acid produced from methanol low pressure carbonyl method

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Embodiment 2

[0035] Tower 1: The vacuum insulation rectification column is used in the laboratory, the height of the vacuum section is 750mm, the tower diameter is 20mm, and 316L stainless steel 2×2mmθ mesh ring packing is installed inside. The conversion index of packing and tray = 22 trays / m, so 22mm Equivalent to 5 trays. The feed is fed at the bottom of the tank, the heat of the system is controlled by a pressure regulator in the tank, and the reflux ratio is controlled by a fractionating head at the top of the tower. The waste acetic acid 4 discharged from the production process of the acetic acid plant is subjected to intermittent rectification in column 1, with a reflux ratio of 8:1, and low-boiling impurities 5 below T≤115°C are removed at the top and high-boiling substances and solids above 150°C are discharged at the bottom Impurity 6, the amount of high and low boiling impurities accounts for about 9% of the total amount of spent acid, (experimental data is provided below), and ...

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Abstract

The invention discloses a separating and extracting method of acetate and propionic acid from waste acetate in the low-pressure carbinol carbonyl method, which comprises the following steps: 1. putting acetate, propionic acid, iodide, acetaldehyde, methyl acetate, organic and inorganic salt in the rectifying tower; 2. recycling high-purity and high-density acetate and propionic acid through common rectifying technique.

Description

technical field [0001] The invention relates to a method for treating waste acetic acid, in particular to a method for separating and extracting acetic acid and propionic acid from waste acetic acid produced by a methanol low-pressure carbonyl process. Background technique [0002] Methanol low pressure carbonyl method is a kind of acetic acid production method widely used in industry. Under this mode of operation, rhodium or iridium is usually used as a catalyst, and halogen compounds such as methyl iodide or hydrogen iodide are used as promoters. The crude acetic acid produced by the carbonylation reaction method generally contains impurities such as formic acid, a small amount of promoters, methyl acetate, propionic acid, acetaldehyde, and other organic and inorganic salts. The distillation separation method is commonly used in production to purify crude acetic acid. However, since a certain amount of waste acetic acid will be produced by traditional distillation method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/44C07C53/12C07C53/122C07C51/12
Inventor 徐萍曹智龙李彩云封伟良陈艳孙飞
Owner SHANGHAI HUAYI ENERGY CHEM
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