Preparation method for synthesizing propionic acid by carbonylation

A technology of chemical synthesis and propionic acid, applied in the direction of carbon monoxide reaction to prepare carboxylic acid, chemical instruments and methods, organic compound/hydride/coordination complex catalyst, etc., can solve the problem of low activity and achieve improved activity and stability sexual effect

Active Publication Date: 2011-02-16
SHANGHAI HUAYI GRP CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Domestic Southwest Research Institute of Chemical Industry reported a small-scale study on carbonylation of propionic acid through a homogeneous rhodium catalyst, but the reaction activity was low, and the reaction STY did not exceed 1mol / lh [Lai Chongwei, Zeng Jian, Yong Yonghu, Liao Jiong, Chen Qunwen, Preparation of Propionic Acid by Homogeneous Rh Catalyzed Carbonylation of Ethanol [J], Natural Gas Chemical Industry, 2008, 33(4): 40-43]

Method used

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  • Preparation method for synthesizing propionic acid by carbonylation
  • Preparation method for synthesizing propionic acid by carbonylation

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Experimental program
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Effect test

Embodiment 1

[0032] Add iridium acetate (iridium content 48wt%) 313mg, ruthenium iodide (ruthenium content 21wt%) 1.89g, lithium iodide 168mg, iodoethane 15g, distilled water in the 200ml zirconium material autoclave that pressure gauge is housed under air atmosphere 15g, ethyl propionate 37.5g, and the rest is 55.2g of propionic acid solvent, with a total weight of 125 grams. Keeping the reaction temperature at 190° C. and the reaction pressure at 30 bar, the calculated carbonylation rate when the weight ratio of ethyl propionate in the reaction liquid is 15% is 3.2 mol / Lh.

Embodiment 2

[0034] Add iridium acetate (iridium content 48wt%) 313mg, indium iodide (indium content 23wt%) 3.89g, lithium iodide 168mg, iodoethane 15g, distilled water in the 200ml zirconium material autoclave that pressure gauge is housed under air atmosphere 15g, ethyl propionate 37.5g, and the rest is propionic acid solvent 53.3g, total weight 125 grams. Keeping the reaction temperature at 190° C. and the reaction pressure at 30 bar, the calculated carbonylation rate when the weight ratio of ethyl propionate in the reaction liquid is 15% is 1.8 mol / Lh.

Embodiment 3

[0036] Add iridium acetate (iridium content 48wt%) 313mg, subplatinum iodide (platinum content 43wt%) 1.42g, lithium iodide 168mg, iodoethane 15g in the zirconium material autoclave that pressure gauge is housed in 200ml under air atmosphere, 15g of distilled water, 37.5g of ethyl propionate, and 55.8g of propionic acid solvent, the total weight is 125 grams. Keeping the reaction temperature at 190° C. and the reaction pressure at 30 bar, the carbonylation rate when the weight ratio of ethyl propionate in the reaction solution is 15% is calculated to be 2.5 mol / Lh.

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Abstract

The invention relates to a preparation method for synthesizing propionic acid by carbonylation. In the method, ethanol or ethanol derivatives serving as raw materials and a liquid reaction composition are carbonylated to synthesize the propionic acid, wherein the reaction temperature is between 140 and 220 DEG C; the reaction pressure is between 2.0 and 8.0 MPa; the liquid reaction composition comprises rhodium or iridium serving as a main catalyst, iodoethane serving as a cocatalyst, ethyl propionate, the propionic acid, water, and a first iodide and a second iodide serving as accelerants. Due to the addition of the two iodides, the stability of a catalyst and the catalytic activity for synthesizing the propionic acid by the carbonylation of the ethanol can be further improved.

Description

technical field [0001] The invention relates to a preparation method of propionic acid, in particular to a preparation method of carbonylation of ethanol and its derivatives to synthesize propionic acid. Background technique [0002] Propionic acid is a major fine chemical product and raw material for organic synthesis. It has the typical chemical properties of low-carbon carboxylic acids and can be used to prepare propionate, ester, acid chloride, amide and anhydride. Propionic acid and its salts have remarkable effects in preventing grain agglomeration, grain preservation, and feed preservation. At present, the routes for industrially synthesizing propionic acid mainly include Reppe carbonylation method and propionaldehyde oxidation method to prepare propionic acid. The Reppe carbonylation method uses ethylene as a raw material, and reacts with CO and water under the catalysis of nickel carbonyl to generate propionic acid in one step. The reaction is carried out at 250-3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/30B01J31/26B01J31/32C07C51/12C07C53/122
Inventor 赖春波李明曾义红宁春利李彩云张春雷
Owner SHANGHAI HUAYI GRP CO
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