Technology for synthesizing acetic acid

Abstract

The invention provides a technology for synthesizing acetic acid. A production technology mainly comprises the following step: enabling CO and methanol to generate the acetic acid in a reaction kettleunder the conditions that the pressure is 2.3 to 3.5Mpa and the temperature is 180 to 200 DEG C and under the actions of a rhodium catalyst, an iodomethane accelerant and a lithium iodide stabilizingagent; meanwhile, uniformly recycling an iodine-containing substance in a production process; after oxidizing the iodine-containing substance to obtain the acetic acid, recycling, wherein the recycled catalyst and extraction agent can be repeatedly utilized. A whole process technology is advanced and has the advantages of sufficient energy utilization, less energy source consumption, low production cost, high production efficiency and less investment equipment; a zero-emission environment-friendly technology is realized.

Description

technical field [0001] The invention relates to the field of chemical synthesis, in particular to a process for synthesizing acetic acid. Background technique [0002] Acetic acid is a chemical raw material with a wide range of uses. Today, the main method of preparing acetic acid is the methanol carbonyl method. The production of acetic acid produced by this technology has reached more than 99% of the world's total acetic acid production. In the process of methanol carbonyl to prepare acetic acid, methanol and carbon monoxide are the main raw materials for the preparation of acetic acid, and rhodium / iridium-iodine is used as a catalyst for the production of acetic acid. Under a certain temperature and pressure, methanol and carbon monoxide can produce acetic acid through chemical reaction, and the finished product of acetic acid can be obtained through further flash separation process and rectification purification process. There are many chemical components in the methano...

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Problems solved by technology

[0005] In the prior art, aldehyde wastewater is mostly used to react with other substances to generate stable usable substances in the method of aldehyde wastewater treatment. For example, the application number is 200810126702.9. In this invention, aldehyde-containing wastewater is used as absorption water and used for the preparation of bisglyphosate, so as to carry out environmental protection treatment of aldehyde-containing wastewater, but due to the limited water solubility of aldehydes, aldehydes are easy to volatilize from water, and it is very easy to cause aldehyde-containing toxic substances emissions

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