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Method for catalytic synthesis of methyl propionate

A technology of methyl propionate and propionic acid, which is applied in the field of catalytic synthesis of methyl propionate, can solve the problems of limitation, uneven gas-solid contact area, high energy consumption, etc., and achieve the effect of high utilization rate

Active Publication Date: 2012-01-18
沧州旭阳化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although someone uses an acidic ion resin as a stationary phase catalyst to synthesize methyl propionate through a gas-solid reaction, but because it first turns the reactant into a gaseous state, the energy consumption is high, and the gas-solid contact area is uneven, which is affected by the process. limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh 200g of industrial-grade propionic acid and 12g of pyridine bisulfate ionic liquid, mix them evenly and place them in the reaction kettle of the rectification tower.

[0020] (2) Stir and heat the mixture of propionic acid and catalyst with an oil bath. The temperature of the heat transfer oil is 130°C. When the temperature of the mixture of propionic acid and catalyst rises to 120°C, weigh 100g of methanol and 231g of propionic acid, and Mix them together, and continuously feed into the reaction kettle by adjusting the flow rate at 0.8mL / min, maintaining the temperature in the kettle at 104°C.

[0021] (3) When the liquid level of the reactor liquid is greater than three-quarters of the height of the reactor, stop adding propionic acid, and only continuously add the above-mentioned methanol into the kettle at a flow rate of 0.2ml / min until the liquid level is low At three quarters of the reactor height, continue to add the mixture of propionic acid and methan...

Embodiment 2

[0028] (1) Weigh 150g of industrial-grade propionic acid and 1.5g of p-toluenesulfonic acid, mix them evenly and place them in the reaction kettle of the rectification tower.

[0029] (2) Stir and heat the mixture of propionic acid and catalyst with an oil bath. The temperature of the heat transfer oil is 120°C. When the temperature of the mixture of propionic acid and catalyst rises to 100°C, weigh 80g of methanol and 185g of propionic acid, and Mix them together, and continuously feed into the reaction kettle by adjusting the flow rate at 0.4mL / min, maintaining the temperature in the kettle at 102°C.

[0030] (3) When the liquid level of the reactor liquid is greater than 3 / 4 of the height of the reactor, stop adding propionic acid, and only continuously add the above-mentioned methanol dropwise into the reactor, the flow rate of methanol is 0.1ml / min, until the liquid level is low At three quarters of the reactor height, continue to add the mixture of propionic acid and met...

Embodiment 3

[0037] (1) Weigh 250g of industrial-grade propionic acid, 10g of imidazole p-toluenesulfonic acid ionic liquid and 5g of pyridine p-toluenesulfonic acid ionic liquid, mix them uniformly and place them in a 500ml rectification column reactor.

[0038] (2) Stir and heat the mixture of propionic acid and catalyst with an oil bath. The temperature of the heat transfer oil is 160°C. When the temperature of the mixture of propionic acid and catalyst rises to 140°C, weigh 120g of methanol and 277g of propionic acid. Mix them together, and continuously feed into the reaction kettle by adjusting the flow rate at 0.6mL / min, maintaining the temperature in the kettle at 102°C.

[0039] (3) When the liquid level of the reactor liquid is greater than three-quarters of the height of the reactor, stop adding propionic acid, and only continuously add the above-mentioned methanol into the kettle at a flow rate of 0.3ml / min until the liquid level is low At three quarters of the reactor height, c...

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PUM

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Abstract

The invention discloses a method for catalytic synthesis of methyl propionate. The method comprises the steps of: uniformly mixing a catalyst and propanoic acid, adding to a reaction kettle, heating the reaction kettle in an oil bath, after the liquid in the kettle reaches a certain temperature, continuously adding a mixture of propanoic acid and methanol, beginning an esterification reaction, and rectifying with a rectifying tower to obtain methyl propionate, wherein the catalyst is selected from an ion liquid of pyridinium hydrogen sulfate, imidazolium hydrogen sulfate, pyridinium p-toluenesulfonate, imidazolium p-toluenesulfonate and imidazolium hydrogen phosphate or p-toluenesulfonic acid. The method has the advantages that the equipment corrosion caused by strong acidity when sulfuric acid is used as the catalyst is avoided, the industrial investment cost is lowered, the utilization rate of the catalyst is higher, and the yield of the esterification reaction can reach more than 93%.

Description

technical field [0001] The invention relates to a method for catalytically synthesizing methyl propionate. Background technique [0002] Methyl propionate is generally used as a solvent for the production of cellulose, coatings and spices, and as an intermediate in various organic synthesis reactions. In recent years, with the development of MMA process, the process of synthesizing MMA with formaldehyde under catalyst conditions has been developed using methyl propionate as raw material, which has become a new application of methyl propionate. [0003] The traditional methyl propionate synthesis process generally uses sulfuric acid as a catalyst, and propionic acid and methanol are directly esterified to synthesize methyl propionate. Sulfuric acid is highly acidic and oxidizing, and has high requirements for equipment materials and design requirements. Although someone uses an acidic ion resin as a stationary phase catalyst to synthesize methyl propionate through a gas-sol...

Claims

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Application Information

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IPC IPC(8): C07C69/24C07C67/08B01J31/02
Inventor 杨雪岗张新志张英伟王灵清杨洪庆尹祖建黄茂辉云志强李辉张敏生
Owner 沧州旭阳化工有限公司
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