Catalyst system of catalytic methylester acetate or methylether synthetic acetoanhy dride and use thereof

A catalytic system, technology of methyl acetate, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, carboxylic anhydride preparation, etc., can solve the problem that the reaction rate has no development value and the reaction is slow , to achieve the effects that are conducive to adjustment and optimization, stable properties, and improved activity

Active Publication Date: 2006-05-31
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

[0009] In the carbonylation of methyl acetate using a rhodium-based catalyst for the carbonylation of methanol to acetic acid, the reaction proceeds so slowly that the reaction rate is not commercially exploitable even at temperatures up to 220°C.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add [Rh(CO) 2 Cl] 2 0.044g, methyl acetate 0.70mol, acetic acid 0.09mol, methyl iodide 0.22mol, LiI 3 ·3H 2 O 1.6g, (CH 3 CO) 2 O 0.15mol, (NH 4 ) 3 PO 4 4H 2 O 2.5g; after replacing the air in the reactor with carbon monoxide twice, fill the system with hydrogen at a pressure of 0.2MPa and carbon monoxide at a pressure of 3.0MPa; then heat up to 160±5°C and set the stirring speed at 400 rpm , the total reaction pressure is controlled to 5.0MPa, and the reaction time is 15min. Methyl acetate conversion rate is 25.2%, and the space-time yield of acetic anhydride is 5.8mol (CH 3 CO) 2 O / (L·h).

Embodiment 2

[0027] Add [Rh(CO) 2 Cl] 2 0.144g, methyl acetate 0.63mol, acetic acid 0.93mol, methyl iodide 0.10mol, LiI 3 ·3H 2 O 6.0g, (CH 3 CO) 2 O 0.15mol, Zn 3 (PO 4 ) 2 4H 2 O 0.17g; after replacing the air in the reactor with carbon monoxide twice, fill the system with hydrogen at a pressure of 0.5MPa and carbon monoxide at a pressure of 6.0MPa; then heat up to 180±5°C and set the stirring speed at 400 rpm , the total reaction pressure is controlled to 5.0MPa, and the reaction time is 15min. Methyl acetate conversion rate is 57.5%, and the space-time yield of acetic anhydride is 12.8mol (CH 3 CO) 2 O / (L·h).

Embodiment 3

[0029] Add [Rh(CO) 2 Cl] 2 0.91g, methyl acetate 0.63mol, acetic acid 0.40mol, methyl iodide 0.22mol, LiI 3 ·3H 2 O 6.0g, (CH 3 CO) 2 O 0.15mol, Li 3 PO 4 1.5g; after replacing the air in the reactor with carbon monoxide twice, fill the system with hydrogen at a pressure of 0.5MPa and carbon monoxide at a pressure of 3.0MPa; then heat up to 240±5°C, set the stirring speed at 400 rpm, The total reaction pressure is controlled to 4.5MPa, and the reaction time is 15min. Methyl acetate conversion rate is 48.2%, and the space-time yield of acetic anhydride is 10.7mol (CH 3 CO) 2 O / (L·h).

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PUM

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Abstract

A catalyst system for synthesizing the acetic anhydride from methyl acetate or bimether by catalytic reaction contains active component (Rh matches) and cocatalyst (alkyl diodine, phosphate and iodine salt). Said catalytic reaction between methyl acetate or bimether, CO and H2 is conducted in acetic acid. Its advantages are high catalytic activity and high stability.

Description

technical field [0001] The invention relates to a homogeneous reaction catalyst system for carbonylation of acetic anhydride, in particular to a catalyst system for catalyzing the synthesis of acetic anhydride from methyl acetate or dimethyl ether. [0002] The present invention also relates to the application of the above-mentioned catalytic system in the oxo-synthesis of acetic anhydride, specifically, the application in catalyzing the reaction of methyl acetate or dimethyl ether into acetic anhydride. Background technique [0003] Acetic anhydride is not only a compound used in large quantities as a raw material for the production of cellulose acetate, but also an important raw material for the synthesis of chemical products such as drugs, fragrances, and dyes. [0004] Acetic anhydride is produced initially by wood pulp distillation, then by the ketene process based on acetic acid, acetone, and finally by the oxidation of acetaldehyde. Methyl acetate carbonylation has n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J27/16B01J31/16C07C51/56C07C53/12
Inventor 袁国卿钱庆利李峰波凌晨邵守言
Owner INST OF CHEM CHINESE ACAD OF SCI
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