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Catalyst system for synthesizing acetic acid and acetic anhydride from carbonyl compound and its uses

A technology for oxo synthesis and acetic anhydride is applied in the field of catalytic systems for synthesizing acetic acid by carbonylation of methanol and synthesizing acetic anhydride by carbonylation of methyl acetate. High activity, maintaining stability, alleviating the effect of excessive iodine content

Active Publication Date: 2006-12-13
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of this chemical reaction equilibrium limits the possible conversion rate of methyl acetate in the carbonylation reaction, and at the same time, the participation of the reverse reaction will reduce the production efficiency of the reactor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add Rh(OAc) to a 250ml zirconium autoclave 2 0.144g, 0.73mol of methanol, 1.12mol of acetic acid, 0.19mol of methyl iodide, 0.5g of sodium phosphotungstate; after replacing the air in the reactor with carbon monoxide twice, fill the system with carbon monoxide and close the system, set the stirring speed as 400 rpm, controlled reaction pressure 4.0Mpa, reaction temperature 150°C, reaction time 15min. The conversion rate of methanol is 90.3%, the content of methyl acetate in the product is 0.02mol, and the space-time yield of acetic acid is 24.5molAcOH / (L·h).

Embodiment 2

[0039] Add Rh(OAc) to a 250ml zirconium autoclave 2 0.144g, methyl alcohol 0.73mol, acetic acid 1.12mol, iodomethane 0.19mol, sodium phosphomolybdate 0.5g; After replacing the air in the reaction kettle with carbon monoxide twice, fill the system with carbon monoxide and close the system, set the stirring speed as 400 rpm, controlled reaction pressure 4.0Mpa, reaction temperature 150°C, reaction time 17min. The methanol conversion rate is 95.1%, the methyl acetate content in the product is 0.03 mol, and the space-time yield of acetic acid is 22.8 mol AcOH / (L·h).

Embodiment 3

[0041] Add Rh(OAc) to a 250ml zirconium autoclave 2 0.144g, methanol 0.70mol, acetic acid 1.20mol, methyl iodide 0.19mol, potassium phosphotungstate 0.5g; after replacing the air in the reactor with carbon monoxide twice, fill the system with carbon monoxide and close the system, set the stirring speed to 500 rpm, controlled reaction pressure 4.0Mpa, reaction temperature 145°C, reaction time 15min. The methanol conversion rate was 89.3%, the methyl acetate content in the product was 0.03 mol, and the space-time yield of acetic acid was 20.5 mol AcOH / (L·h).

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PUM

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Abstract

The related catalyst system comprises Rh compound as catalyst, all of alkyl iodide, heteropoly salt and alkali iodide together as promoter. This invention is fit to prepare acetyl oxide by carbonylating methyl acetate or acetic acid by methanol.

Description

technical field [0001] The present invention relates to a kind of catalytic system and application for carbonylation of acetic acid and acetic anhydride, in particular to a kind of catalytic system and application of methanol carbonylation into acetic acid and methyl acetate carbonylation into acetic anhydride. Background technique [0002] Acetic acid is an important organic chemical raw material, mainly used in the production of vinyl acetate monomer, acetic anhydride, terephthalic acid (PTA), polyvinyl alcohol, acetate esters, cellulose acetate, etc. It is widely used in chemical industry, light textile, medicine, dyestuff and other industries. In recent years, due to the development of PTA and downstream products of acetic acid, acetic acid has become one of the few petrochemical products whose output and demand are growing rapidly. Acetic anhydride is a compound used in large quantities as a raw material for the production of cellulose acetate, and is also an important...

Claims

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Application Information

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IPC IPC(8): B01J27/188B01J27/06B01J23/46C07C51/12C07C51/56C07C53/12C07C53/08
Inventor 袁国卿钱庆利张抒峰李峰波闫芳陈墨庆崔伟徐庆沈才大
Owner INST OF CHEM CHINESE ACAD OF SCI
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