The physicochemical properties and preparation methods of acetic acid (2)

(2) AO Plus process

In the 1980s, Celanese successfully developed a new AO-Plus method (acid optimization method) based on the traditional Monsanto method

(3) Cativa process

In 1996, BP Chemical Company successfully developed a new Cativa process based on methanol carbonylation to synthesize acetic acid

(4) UOP/Chiyoda Acetica process

Japan's Chiyoda (Ehiyoda) and UOP jointly developed the Acetica methanol carbonylation process for preparing acetic acid in 1997 , and completed the pilot test in 1999

The Acetica process is different from the conventional heterogeneous catalysis system in that there is no need for excess water in the solution to maintain the metal activity of the catalyst

The acetic acid plant of Guizhou Organic Crystal Chemicals Group Company of China is the world's first acetic acid production plant using Aeetiea process

(5) Partially improved preparation method

① European patent EP2628720 (A1) This patent provides a method for efficiently removing acetaldehyde and stably producing high-purity acetic acid

The manufacturing process includes the following steps

In the presence of metal catalyst, halide salt and methyl iodide, methanol and carbon monoxide react; the reaction mixture is continuously supplied to the flash evaporator and separated into low boiling point components (2A) containing acetic acid and methyl iodide, and metal catalyst and The high boiling point component (2B) of the halide salt; the low boiling point component (2A) is supplied to the distillation column and separated into a low boiling point component (3A) containing methyl iodide and acetaldehyde and a fraction containing acetic acid (3B) , And recover acetic acid ; condense the low-boiling point component (3A), temporarily place it in a decanter, and then discharge; separate acetaldehyde from the low-boiling point component (3A) discharged from the above-mentioned decanter, and circulate the separated liquid at the same time To the reaction system

②U.

At present, the ethylene-acetaldehyde oxidation method and the low-pressure methanol carbonylation method are the two most important acetic acid production methods in the world, but the economic indicators of the latter are far superior to the former

Related links: Physicochemical properties and preparation methods of acetic acid (1)