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A kind of improved production process of crotonaldehyde

A production process and a crotonaldehyde technology are applied in the field of improved production technology of crotonaldehyde, can solve the problems such as inability to overcome the difficulty of accurate control of the reaction process, and achieve the effects of improving the conversion rate of condensation reaction and environmental protection, reducing the amount of waste water produced, and reducing the amount of consumption.

Active Publication Date: 2020-09-15
福建福大双众化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional inorganic base catalysts, the use of quaternary ammonium bases or organic amines can help reduce the amount of waste water produced, but they are still homogeneous catalysts that need to add acid to neutralize the base in the acetaldehyde condensation reaction system to terminate the side reaction cannot overcome the problem that the reaction process is difficult to accurately control

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  • A kind of improved production process of crotonaldehyde

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Embodiment 1

[0018] The filler in the reaction section of the condensation tower is a solid-supported alkaline ionic liquid catalyst 1-butyl-3-methylimidazolium hydroxide [BmIm]OH, and the height of the filler is 4m. The acetaldehyde distillation section and the butanol aldehyde concentration section are both For 5 trays. With a flow rate of 3600L / h, acetaldehyde is fed from the upper part of the reaction section of the condensation tower, filled with N 2 The pressure at the top of the condensation tower is 150KPa, and the desalted water is fed from the upper part of the reaction section at a flow rate of 720L / h, so that the temperature of the condensation reaction section is maintained at 48-49°C, and acetaldehyde is catalyzed by the solid-supported alkaline ionic liquid catalyst A condensation reaction occurs under the action to generate butanol aldehyde, and the temperature of the tower reactor is controlled at 74-75°C. The acetaldehyde evaporated from the top of the tower is fully ref...

Embodiment 2

[0023] The filler in the reaction section of the condensation tower is a solid-supported alkaline ionic liquid catalyst 1-butyl-3-methylimidazolium hydroxide [BmIm]OH, and the height of the filler is 5m. The acetaldehyde distillation section and the butanol aldehyde concentration section are both For 5 trays. With a flow rate of 3400L / h, acetaldehyde is fed from the upper part of the reaction section of the condensation tower, filled with N 2 The pressure at the top of the condensation tower is 145KPa, and the desalted water is fed from the upper part of the reaction section at a flow rate of 720L / h, so that the temperature of the condensation reaction section is maintained at 47-49°C, and acetaldehyde is catalyzed by the solid-supported alkaline ionic liquid catalyst Condensation reaction occurs under the action to generate butanol aldehyde, and the temperature of the tower reactor is controlled at 72-74°C. The acetaldehyde evaporated from the top of the tower is fully reflu...

Embodiment 3

[0028] The filler in the reaction section of the condensation tower is a solid-supported alkaline ionic liquid catalyst 1-butyl-3-methylimidazolium hydroxide [BmIm]OH, and the height of the filler is 5m. The acetaldehyde distillation section and the butanol aldehyde concentration section are both For 5 trays. With a flow rate of 3000L / h, acetaldehyde is fed from the upper part of the reaction section of the condensation tower, filled with N 2 The pressure at the top of the condensation tower is 140KPa, and the desalted water is fed from the upper part of the reaction section at a flow rate of 610L / h, so that the temperature of the condensation reaction section is maintained at 47-49°C, and acetaldehyde is catalyzed by the solid-supported alkaline ionic liquid catalyst Condensation reaction occurs under the action to generate butanol aldehyde, and the temperature of the tower reactor is controlled at 73-75°C. The acetaldehyde evaporated from the top of the tower is fully reflu...

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Abstract

The invention discloses an improved production technology of crotonaldehyde. The improved production technology comprises the following steps: by using solid-supported alkaline ion liquid of 1-butyl-3-methylimidazole hydroxide salt [BmIm]OH as a catalyst, into a condensation tower with the catalyst as a filler in the form of a bundled packet, and enabling acetaldehyde to generate condensation reaction in the condensation tower to generate aldol; then, performing dewatering reaction on the aldol in a dewatering tower under the action of acetic acid, so as to obtain a crude product of the crotonaldehyde; treating by a prefractionation tower and a rectification tower in sequence, so as to obtain a crotonaldehyde product. The improved production technology has the advantages that bundled packet of the solid-supported alkaline ion liquid catalyst is used for replacing the traditional inorganic alkaline and is used as the catalyst for the condensation reaction, the reaction is mild, a byproduct is reduced, the reaction yield is greatly improved, the amount of wastewater in the reaction process is greatly reduced, and the energy consumption required by separating and recycling is decreased.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to an improved production process of crotonaldehyde. Background technique [0002] Crotonaldehyde, scientific name crotonaldehyde, also known as methacrolein, has two isomers, cis and trans. Crotonaldehyde is an important chemical intermediate product, which can be used in the production of crotonic acid, isobutanol, n-butanol, methoxybutanol and other chemical products, and is mainly used in the production of sorbic acid. Using acetaldehyde as raw material, under the action of basic catalyst, carry out acetal reaction to generate butanol aldehyde, and then dehydrate in acidic solution to generate crotonaldehyde, which is a conventional industrial route for synthesizing crotonaldehyde. However, the main disadvantage of using an inorganic base as a condensation reaction catalyst is that the condensation reaction rate is fast and there are many by-products. In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C45/72C07C47/263C07C45/66C07C47/21B01J31/02
CPCB01J31/0295B01J2231/342C07C45/66C07C45/72C07C47/263C07C47/21
Inventor 黄丹邱挺杨金杯杨臣王红星叶长燊王晓达黄智贤李玲陈锦溢
Owner 福建福大双众化工科技有限公司
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