Catalyst system for use in preparation of acetic acid and acetic anhydride or synchronous preparation of acetic acid and acetic anhydride and preparation method thereof

A technology of acetic anhydride and catalyst, applied in the field of catalyst system and preparation thereof, can solve the problems of easy precipitation, rising production cost, poor product purity, etc., and achieve the effects of reduced corrosion, reduced manufacturing cost and improved stability

Active Publication Date: 2010-03-03
SHANGHAI HUAYI ENERGY CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Adopt this rhodium-based catalyst carbonylation method to prepare the mixture of acetic anhydride or acetic acid, acetic anhydride and there are following three problems: (1) can produce tar (the mixture of macromolecular organic polymer) while reacting; (2) the carbonylation The acetic acid and acetic anhydride product potassium permanganate index that method obtains is high, and the purity of product is poor; (3) the rhodium catalyst stability that this carbonylation method uses is poor, easily precipitates
However, there is no great breakthrough in the research of new catalysts for acetic anhydride
[0008] However, the world's carbonylation reactors for the production of acetic acid combined with acetic anhydride still use rhodium-based catalysts, and the production cost is still rising

Method used

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  • Catalyst system for use in preparation of acetic acid and acetic anhydride or synchronous preparation of acetic acid and acetic anhydride and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0044] Add rhodium precursor rhodium iodide and iridium iodide in the reaction still prepared by catalyst, make the mass ratio of rhodium and iridium be (2~10):(5~20), add the N with iridium mole fraction 1:1 -Methylalanine and water; add methyl iodide and acetic acid as a solvent; then pass through CO, and stir for 2 hours at a reaction temperature of 150° C. and a pressure of 3.0 MPa. After cooling, it is detected with an infrared spectrometer that rhodium in the catalyst solution is [Rh(CO) 2 I 2 ] - Exists in the form of iridium [Ir(CO) 2 I 2 ] - form exists.

Embodiment B

[0046] Add the rhodium precursor rhodium iodide in the reaction kettle prepared by the catalyst, then add methyl iodide and solvent acetic acid, then pass into CO, and react for 2 hours at a reaction temperature of 150° C. and a pressure of 3.0 MPa to prepare a rhodium coordination compound. This coordination compound is in the form of a solution.

[0047] This example is not an example of the invention because there is no amino acid or amino acid derivative stabilizer in the catalyst system.

Embodiment 1

[0049] The dosage of each raw material in the catalyst system is: 8 parts by weight of rhodium iodide; 10 parts by weight of iridium iodide; 1200 parts by weight of methyl iodide; the molar ratio of N-methylalanine to iridium is 1.0; and 2.5 parts by weight of lithium acetate.

[0050] Prepared by the method described in Example A.

[0051] in the process as attached figure 1 In the continuous device of the present invention, the above-mentioned product is added in the reactor together with methyl iodide, acetic acid, acetic anhydride, lithium acetate, and the addition amount of methyl iodide, acetic acid, acetic anhydride is determined according to reaction needs, and the purpose of acetic anhydride consumes the water added in the catalyst preparation . The reaction temperature is 190°C, the pressure is 4.0MPa, the mass concentration of rhodium in the control reaction solution is 800ppm, the mass concentration of iridium is 1000ppm, the mass concentration of lithium is 250pp...

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Abstract

The invention discloses a catalyst system for use in the preparation of an acetic acid and an acetic anhydride or the synchronous preparation of the acetic acid and the acetic anhydride, which is characterized by comprising: a mixture of rhodium or one or more selected from rhodium compounds and iridium or one or more selected from iridium compounds; a methyl iodide; at least one selected from a mixture of an amino acid and an amino acid derivative and the amino acid or the amino acid derivative; and an accelerant. The catalyst system disclosed by the invention overcomes the disadvantages of high tar content of reaction liquid, low product purity and poor stability of the catalyst in the production of the acetic acid and the acetic anhydride in the presence of a rhodium-based catalyst.

Description

technical field [0001] The invention relates to a catalyst system for preparing acetic acid, acetic anhydride or simultaneously preparing acetic acid and acetic anhydride and a preparation method thereof. Background technique [0002] As an important basic organic chemical raw material, acetic acid and acetic anhydride and their downstream derivatives are widely used in medicine, synthetic fiber, light industry, textile, leather, pesticide, explosive, rubber and metal processing, food and fine organic Synthesis of chemicals. At present, the market prospect of acetic acid and acetic anhydride in the world is quite promising. [0003] The method for producing acetic acid and acetic anhydride in the prior art is to take a continuous production device, which is produced by the reaction of methanol and methyl acetate or dimethyl ether and methanol and carbon monoxide. [0004] The catalytic system for oxo-synthesizing acetic acid or acetic anhydride has gone through three stage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J31/28C07C51/12C07C53/08
Inventor 王群山炜巍赖春波赵兵兵李俊岭
Owner SHANGHAI HUAYI ENERGY CHEM
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