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Catalyst system for methanol low-pressure carbonyl synthesis of acetic acid and application thereof

A carbonyl synthesis and catalyst technology, applied in the field of catalyst systems, can solve the problems of increasing the complexity of the product post-treatment process, accelerating the water-gas reaction, and improving the strong corrosion, so as to facilitate the catalytic reaction rate, increase the solubility, and reduce corrosion. Effect

Active Publication Date: 2011-01-26
HUALU ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the catalyst structure model in the current industrial production has good catalytic activity, it is easy to convert into a trivalent rhodium anion complex at high temperature and low carbon monoxide partial pressure, and then precipitates and loses its activity.
In addition, in order to increase the solubility of the catalyst in the acetic acid production process, the reaction system needs to maintain higher water and hydroiodic acid content so as to maintain the higher reactivity of the system (EP55618, EP161874), but therefore accelerates the water gas reaction and consumes The raw material is carbon monoxide, and the strong corrosiveness of the medium increases the requirements for equipment materials, and the large amount of water in the system increases the complexity of the product post-treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add [Rh(CO) 2 Cl] 2 0.150g, methanol 0.79mol, acetic acid 0.83mol, methyl iodide 0.10mol, water 4%, hydroiodic acid 0.2%, lithium iodide 8.0g, LiHSO 3 0.3g.

[0035] 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, the reaction temperature to 170°C, the reaction pressure to 3.0 MPa, and the reaction time to 18 minutes. The conversion rate of methanol is 99.0%, and the space-time yield of acetic acid is 21.2molAcOH / (L·h).

Embodiment 2

[0037] Add Rh(OAc) to a 250mL zirconium autoclave 2 0.160g, methanol 0.79mol, acetic acid 0.83mol, methyl iodide 0.12mol, water 4%, hydroiodic acid 0.3%, lithium iodide 8.0g, NaHSO 30.3g.

[0038] 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 at 500 rpm, the reaction temperature at 170°C, the reaction pressure at 3.2 MPa, and the reaction time at 20 minutes. The conversion rate of methanol was 99.1%, and the space-time yield of acetic acid was 19.8molAcOH / (L·h).

Embodiment 3

[0040] Add RhBr to 250mL zirconium autoclave 3 0.330g, methanol 0.72mol, acetic acid 0.83mol, methyl iodide 0.10mol, water 5%, hydroiodic acid 0.2%, lithium iodide 8.0g, LiHSO 3 0.3g.

[0041] 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 at 500 rpm, the reaction temperature at 170°C, the reaction pressure at 3.0 MPa, and the reaction time at 21 minutes. The conversion rate of methanol is 98.8%, and the space-time yield of acetic acid is 18.5molAcOH / (L·h).

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PUM

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Abstract

The invention relates to a catalyst system used for methanol low-pressure carbonyl synthesis of acetic acid, which uses rhodium compounds as the active component carbonylation of carbonyl synthesis catalyst and uses alkyl iodide, water, hydroiodic acid, alkali metal iodate and sulfonate as promoters, and uses acetic acid as polar solvent. Because sulfonate is added to the catalyst system, better catalytic activity and stability are achieved. In methanol carbonylation, the catalyst system can convert methanol into acetic acid at high speed with high selectivity under lower temperature and pressure. The reaction reduces the concentration of water and hydroiodic acid, and reduces corrosivity to equipment.

Description

technical field [0001] The invention relates to a catalyst system for catalyzing the low-pressure carbonylation of methanol to acetic acid and its application. Background technique [0002] The industrial production methods of acetic acid include acetaldehyde oxidation, butane or light oil liquid phase oxidation, and methanol carbonylation. Among them, the methanol low-pressure carbonylation method has the advantages of simple process, mild reaction conditions, good selectivity, and low energy consumption. It has become the most competitive production method of acetic acid in the world, and it is also the main production route for the synthesis of acetic acid in the world. In addition, the raw material methanol has sufficient supply and low cost, and has the characteristics of atomic economic reaction in which all reactant molecules generate all target product molecules. While reducing the environmental pollution caused by by-products, it is of great significance to the coor...

Claims

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Application Information

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IPC IPC(8): B01J31/02C07C53/08C07C51/12
Inventor 邬慧雄蒋晓伟张毅航赵秋松
Owner HUALU ENG & TECH
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