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Novel catalytic cracking method of alpha-acetyl-gamma-butyrolactone

A catalytic cracking and acetylation technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problem of insufficient catalyst activity, multiple cracking by-products, high reaction temperature, etc. problem, achieve the effect of reducing other side reactions, high selectivity, and lowering the reaction temperature

Active Publication Date: 2019-05-03
JIANGSU YUXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction temperature of this route is too high, which is difficult for general enterprises to achieve. At the same time, the reaction yield is low, generally lower than 90%, and the product content is also low, containing more cracking by-products, which is caused by insufficient catalyst activity.
[0005] The existing catalytic cracking method of α-acetyl-γ-butyrolactone has more or less defects, or the product yield is low, or the corrosion is too strong in the reaction process, or the cost is too high
Existing technical routes need to be improved in terms of environmental friendliness and cost

Method used

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  • Novel catalytic cracking method of alpha-acetyl-gamma-butyrolactone

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Effect test

Embodiment 1

[0032] 1) In the external circulation pulse reactor 1, add α-acetyl-γ-butyrolactone 6 raw materials, add catalyst 1.0kg (sodium chloride: ZIF-67=1:0.1), the particle size of the catalyst is less than 1000 microns, And pass into dry nitrogen 5 replacement; Open heat exchanger 8;

[0033] 2) After the replacement process is completed, the system is vacuumed;

[0034] 3) Turn on the circulating pump 7, the α-acetyl-γ-butyrolactone 6 raw material is drawn in by the pump 7, and passes through the heat exchanger 8, and the temperature is controlled at 140°C to contact the catalyst in the reactor 1, and the catalyst is mixed with the raw material Liquid 3 undergoes a catalytic cracking reaction, and continuously circulates the reaction to promote the completion of the reaction. Among them, the circulation switch in the external circulation pulsation reactor 1 is closed and opened to perform fluid pulsation operation with a pulsation ratio of 20s:20s, so as to realize the pulsation t...

Embodiment 2

[0039] 1) In the external circulation pulse reactor 1, add α-acetyl-γ-butyrolactone 6 raw materials, add catalyst 1.0kg (sodium iodide: ZIF-67=1:0.5), the particle size of the catalyst is less than 500 microns, And pass into dry nitrogen 5 replacement; Open heat exchanger 8;

[0040] 2) After the replacement process is completed, the system is vacuumed;

[0041] 3) Turn on the circulation pump 7, the α-acetyl-γ-butyrolactone 6 raw material is pumped in by the pump 7, and passes through the heat exchanger 8, and the temperature is controlled at 100°C to contact the catalyst in the reactor 1, and the catalyst is mixed with the raw material Liquid 3 undergoes a catalytic cracking reaction, and continuously circulates the reaction to promote the completion of the reaction. Wherein, the circulation switch in the external circulation pulsation reactor 1 is closed and opened to perform fluid pulsation operation with a pulsation ratio of 120s:1200s, so as to realize pulsation to prom...

Embodiment 3

[0046] 1) In the external circulation pulse reactor 1, add α-acetyl-γ-butyrolactone 6 raw materials, add catalyst 1.0kg (potassium iodide: ZIF-67=1:0.2), the particle size of the catalyst is less than 500 microns, and pass Enter dry nitrogen 5 replacement; Open heat exchanger 8;

[0047] 2) After the replacement process is completed, the system is vacuumed;

[0048] 3) Turn on the circulation pump 7, the α-acetyl-γ-butyrolactone 6 raw material is pumped in by the pump 7, and passes through the heat exchanger 8, and the temperature is controlled at 130°C to contact the catalyst in the reactor 1, and the catalyst is mixed with the raw material Liquid 3 undergoes a catalytic cracking reaction, and continuously circulates the reaction to promote the completion of the reaction. Among them, the circulation switch in the external circulation pulsation reactor 1 is closed and opened to perform fluid pulsation operation with a pulsation ratio of 40s:80s, so as to realize the pulsation...

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Abstract

The invention discloses a novel catalytic cracking method of alpha-acetyl-gamma-butyrolactone. The method comprises the steps of adding raw materials of the alpha-acetyl-gamma-butyrolactone into an external circulation pulsation reactor, introducing dry nitrogen for replacement, and turning on a heat exchanger; after the replacement process is completed, performing vacuumizing on the system; and performing other steps. According to the method provided by the invention, the unique external circulation pulsation reactor and a pulsation conveying external circulation mode are adopted, so that mass transfer among various reactants in the reactor is greatly promoted, and the reaction can be controlled by kinetics; the mass transfer speed of the reaction is further improved by an order of magnitude or more through a pulsation manner; a combined catalyst used in the method has high catalytic efficiency, high activity and high selectivity, so that the reaction temperature is reduced, other side reactions of cracking at high temperature is reduced, the energy consumption is reduced, and the costs are reduced.

Description

technical field [0001] The invention belongs to the technical field of organic chemistry, and in particular relates to a novel catalytic cracking method of α-acetyl-γ-butyrolactone. Background technique [0002] α-acetyl-γ-butyrolactone, referred to as ABL, has a molecular formula of C6H8O3 and a molecular weight of 128.13. It is a colorless and transparent liquid with an ester odor. It is soluble in organic solvents and has a solubility of 20% in water. Stablize. The main purpose is to synthesize vitamin B1 and pesticides. In recent years, foreign countries have developed a catalytic cracking method of α-acetyl-γ-butyrolactone, which can be used to prepare cyclopropanone, which can be used more widely. [0003] Cyclopropanone is an important organic raw material and intermediate. In medicine, it is mainly used in the synthesis of anti-AIDS drugs Efluverenz and Ilremin; in pesticides, it is mainly used in the synthesis of fungicides cyprodinil and cyproconazole. There ar...

Claims

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Application Information

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IPC IPC(8): C07C45/59C07C49/293B01J31/26
Inventor 张治国徐官根徐林斌黄剑程红伟
Owner JIANGSU YUXIANG CHEM
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