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Method for preparing acetic acid

A technology of acetic acid and methyl acetate, applied in the field of acetic acid production, can solve the problems such as precipitation of liquid reaction mixture, reduction of carbon monoxide partial pressure, increase of production cost, etc., and achieves long service life, high stability, high catalyst activity and selectivity Effect

Active Publication Date: 2015-07-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In the prior art, the iridium catalyst system is used to catalyze the carbonylation of methanol to prepare acetic acid. When the carbon monoxide content is low, precipitation occurs in the liquid reaction mixture because the iridium catalyst system becomes unstable; in addition, in the treatment process after the carbonylation reaction, In order to separate the catalyst, the liquid reaction mixture needs to be flashed. Due to the presence of a large number of co-catalysts and promoters, the partial pressure of carbon monoxide at this time is significantly reduced, so that the flash stage of separating the catalyst and the pipeline of the catalyst recycling back to the reactor will be greatly reduced. A large amount of precipitation will lead to catalyst deactivation, resulting in increased production costs

Method used

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  • Method for preparing acetic acid

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Embodiment 1

[0029] Will contain 60g of acetic acid, 12g of methyl iodide, 45g of methyl acetate, 7.5g of water, Ru(CO) 4 I 2 1.05g (equivalent to 1500ppm Ru content), MnI 2 4H 2 O1.04g (equivalent to Mn content is 1000ppm) solution joins in the 300ml zirconium material autoclave, with acetic acid 18g, water 3.6g and H 2 IrCl 6 0.72g (equivalent to 2000ppm Ir content) was added to the liquid injection system. After pressure test and slow replacement of nitrogen, 0.6MPa CO is introduced, heated to 185°C under stirring at 750 rpm, then CO is introduced to about 2.5MPa and stabilized for 30 minutes, and the liquid is injected into the system with 2.8MPa carbon monoxide gas The catalyst solution was added to the autoclave and the reaction started. Containing 20wt% MeOAc and 6.26wt% H in the corresponding liquid combination reactant 2 At 0, the carbonylation reaction rate was measured to be 25.5mol / (L·hr); in the liquid composition reactant corresponding to 15wt%MeOAc and 5.05wt%H 2 At O...

Embodiment 2

[0031] With embodiment 1, difference is to add MnI 2 4H 2 O2.08g (equivalent to a Mn content of 2000ppm). See Table 1 for the data.

Embodiment 3

[0033] With embodiment 1, difference is to add OsCl 3 ·3H 2 O0.42g (equivalent to Os content of 1500ppm) and MnI 2 4H 2 O3.12g (equivalent to Mn content is 3000ppm). See Table 1 for the data.

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Abstract

A disclosed method for preparing acetic acid comprises: in the presence of water, a catalyst and a solvent, contacting methanol and / or a methanol derivative with carbon monoxide to obtain acetic acid, wherein the catalyst comprises an iridium compound, a halogen-containing cocatalyst, a promoter and a manganese-containing compound, and the promoter is selected from a ruthenium-containing compound and an osmium-containing compound. By utilizing the method provided by the invention for preparing acetic acid, the catalyst activity and the selectivity are relatively high, and also in subsequent flash evaporation and circulation steps, no precipitate is easy to generate even the content of carbon monoxide is low, and the catalyst is high in stability, so that the preparation method has relatively good application prospect.

Description

technical field [0001] The invention relates to a method for preparing acetic acid. In particular, the present invention relates to a process for the preparation of acetic acid by carbonylation. Background technique [0002] As an important basic organic chemical raw material, acetic acid is widely used in various fields such as fibers, plasticizers, paints, adhesives, and copolymer resins. It is a chemical product with a rapid increase in production capacity in recent years. At present, the main methods of producing acetic acid in the world are acetaldehyde oxidation, butane and light oil oxidation and methanol carbonylation. Among them, the production of acetic acid by methanol carbonylation has accounted for more than 70% of the world's acetic acid production. [0003] The production of acetic acid by catalyzing the carbonylation of methanol with an iridium catalyst system is known and has been applied in industrial production. As early as the development of rhodium-ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/12B01J31/32B01J27/138
CPCC07C51/12C07C53/08
Inventor 刘博吕顺丰王世亮李彤
Owner CHINA PETROLEUM & CHEM CORP