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Catalyst system for carbonylation of methanol for synthesizing ethanol, and application

A technology of chemical synthesis and carbonyl, applied to the preparation of carboxylic acid by carbon monoxide reaction, chemical instruments and methods, organic compound/hydride/coordination complex catalyst, etc. And the effect of high activity, stable properties and excellent performance

Active Publication Date: 2007-09-19
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

Therefore in industrial production, generally adopt to keep the partial pressure of carbon monoxide or add excessive hydrogen iodide to protect the existence of rhodium (I) complex, but this has greatly increased the corrosive action of reaction medium again to equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add Rh(OAc) to a 250ml zirconium autoclave 2 0.144g, methanol 0.79mol, acetic acid 1.12mol, methyl iodide 0.19mol, (NH 4 ) 3 PO 4 4H 2O 0.5g; After replacing the air in the reaction kettle with carbon monoxide twice, fill the system with carbon monoxide and close the system, the setting stirring speed is 500 rpm, the control reaction pressure is 4.0Mpa, the reaction temperature is 140 ° C, and the reaction time is 20min. The conversion rate of methanol is 88.6%, the content of methyl acetate in the product is 0.02mol, the increment of acetic acid is 0.68mol, and the space-time yield of acetic acid is 19.4mol AcOH / (L·h).

Embodiment 2

[0023] Add Rh(OAc) to a 250ml zirconium autoclave 2 0.144g, methanol 0.79mol, acetic acid 1.12mol, methyl iodide 0.19mol, (NH 4 ) 3 PO 4 4H 2 O 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 at 500 rpm, control the reaction pressure at 4.0Mpa, the reaction temperature at 140°C, and the reaction time for 15min . The conversion rate of methanol is 89.8%, the content of methyl acetate in the product is 0.03mol, the increment of acetic acid is 0.68mol, and the space-time yield of acetic acid is 19.7mol AcOH / (L·h).

Embodiment 3

[0025] Add [Rh(CO) to the 250ml zirconium autoclave 2 Cl] 2 0.136g, methanol 1.24mol, acetic acid 0.87mol, iodomethane 0.21mol, (NH 4 ) 3 PO 4 4H 2 O 1.2g; 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 at 500 rpm, control the reaction pressure at 4.0Mpa, and the reaction temperature at 140°C. The reaction time is 25min. The conversion rate of ethanol is 90%, the content of methyl acetate in the product is 0.03mol, the increment of acetic acid is 1.09mol, and the space-time yield of acetic acid is 23.7mol AcOH / (L·h).

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PUM

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Abstract

A catalyst system for preparing ethanol by carbonylating methanol features that the Ru matches, phosphate and iodomethane are proportionally and respectively used as the active component and cocatalyst. Its advantages are high catalytic activity and high stability.

Description

technical field [0001] The invention relates to a preparation method for synthesizing acetic acid by carbonylation of methanol. 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. [0003] The reaction of carbon monoxide with methanol to prepare acetic acid under the action of a catalyst is an oxo synthesis method developed in the 1940s and 1950s. In the early 1970s, the invention of homogeneous rhodium catalyst for oxo synthesis by Paulik et al. of Monsanto Company (US 3769329) opened up a new imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/16C07C51/12C07C53/08
Inventor 钱庆利李峰波潘平来袁国卿邵守言凌晨夏景峰
Owner INST OF CHEM CHINESE ACAD OF SCI