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Method for preparing acetic acid through hydroformylation reaction

A carbonylation reaction, acetic acid technology, applied to the preparation of carboxylic acid by carbon monoxide reaction, chemical instruments and methods, organic chemistry and other directions, can solve the problems of low carbonylation reaction rate and the like

Active Publication Date: 2014-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the carbonylation reaction rate in the prior art, especially the problem that the carbonylation reaction rate is low under the condition of low water content, and a kind of method for preparing acetic acid by carbonylation is provided, and the method can be used in relatively low water content. Under the condition of low water content, the reaction rate of methanol carbonylation to acetic acid is greatly increased, and the catalyst stability performance can also be improved in the low water content carbonylation environment

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  • Method for preparing acetic acid through hydroformylation reaction

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[0018] In the reaction system for preparing acetic acid of the present invention, based on the total amount of the rhodium catalyst system, water, organic solvent and methyl acetate, the haloalkane promoter can be 3-25wt%, preferably 8-20wt%.

[0019] In the present invention, the iodine compound as the co-promoter can be any iodide of various alkali metals and / or alkaline earth metals known in the art that can be dissolved in the reaction system for preparing acetic acid of the present invention, preferably lithium iodide.

[0020] In the reaction system for preparing acetic acid of the present invention, based on the total amount of rhodium catalyst system, water, organic solvent and methyl acetate, the content of the iodide of the above-mentioned alkali metal and / or alkaline earth metal can be 3-25wt%, Preferably it is 10-20 wt%.

[0021] In the present invention, water can be added into the carbonylation reactor together with the reaction composition; water can also be sep...

Embodiment 1

[0034] The rhodium catalyst system consists of 21 g of methyl iodide, 22.5 g of lithium iodide, 0.28 g of rhodium iodide, and 0.20 g of chloroplatinic acid hexahydrate.

[0035] Will contain acetic acid 73g, methyl iodide 21g, lithium iodide 22.5g, water 6.7g, rhodium iodide 0.28g (corresponding to Rh content 400ppm), hexahydrate chloroplatinic acid 0.20g (corresponding to the molar ratio of platinum and rhodium is 0.66 ) solution was added to a 300ml zirconium material autoclave, and 26.5g of raw material methyl acetate was added to the liquid injection system. After pressure test and air replacement, 0.6MPa of CO is introduced, and it is added to 190°C under stirring at 750 rpm. After that, CO is introduced to about 2.5MPa and stabilized for 30 minutes. The liquid is injected into the system with 3.0MPa of carbon monoxide gas. The raw material methyl acetate was charged into the autoclave and the reaction was started. In the reaction species corresponding to the liquid comb...

Embodiment 2

[0037] The rhodium catalyst system consists of 21 g of methyl iodide, 22.5 g of lithium iodide, 0.28 g of rhodium iodide, and 0.39 g of chloroplatinic acid hexahydrate.

[0038] Will contain acetic acid 73g, methyl iodide 21g, lithium iodide 22.5g, water 6.7g, rhodium iodide 0.28g (corresponding to Rh content 400ppm), hexahydrate chloroplatinic acid 0.39g (corresponding to the molar ratio of platinum and rhodium is 1.32 ) solution was added to a 300ml zirconium material autoclave, and 26.5g of raw material methyl acetate was added to the liquid injection system. After pressure test and air replacement, 0.6MPa of CO is introduced, and it is added to 190°C under stirring at 750 rpm. After that, CO is introduced to about 2.5MPa and stabilized for 30 minutes. The liquid is injected into the system with 3.0MPa of carbon monoxide gas. The raw material methyl acetate was charged into the autoclave and the reaction was started. In the reaction species corresponding to the liquid comb...

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Abstract

The invention provides a method for preparing acetic acid through hydroformylation reaction, which is characterized by enabling carbon monoxide to be in contact with methyl acetate in the presence of water, a rhodium catalyst system and an organic solvent, wherein the rhodium catalyst system comprises a rhodium source, a halogen promoter, an iodide of alkali metal and / or alkaline earth metal and a platinum source; the rhodium source is a rhodium iodide and / or a rhodium complex; and the platinum source is one or more of platinum, a platinum salt and a platinum complex. By using the method to prepare acetic acid, the hydroformylation reaction rate can be obviously increased; and especially in case of a low water content of 0.3-5wt% in the acetic acid preparation reaction system, the reaction rate in the acetic acid preparation process based on methanol hydroformylation can still be increased greatly.

Description

technical field [0001] The invention relates to a method for preparing acetic acid by carbonylation reaction. Background technique [0002] As an important basic organic chemical raw material, acetic acid is widely used in various fields such as fibers, plasticizers, paints, adhesives and copolymer resins. It is a chemical product with a rapid increase in production capacity in recent years. At present, the main methods of producing acetic acid in the world are acetaldehyde oxidation, butane and light oil oxidation and methanol carbonylation. Among them, the production of acetic acid by methanol carbonylation has accounted for more than 70% of the world's acetic acid production. [0003] US3,769,329 discloses a process for producing acetic acid by carbonylation of methanol at low pressure. The process uses a soluble carbonyl rhodium-iodine catalyst system, which can obtain a relatively high carbonylation reaction rate under mild reaction conditions. However, the reaction s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/12B01J31/30
Inventor 刘博丁率吕顺丰王世亮李彤董岩秦燕璜
Owner CHINA PETROLEUM & CHEM CORP