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A novel method for catalytic cracking of α-acetyl-γ-butyrolactone

A catalytic cracking and acetylation technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compounds/hydrides/coordination complex catalysts, etc., can solve the problem of insufficient catalyst activity, multiple cracking by-products, and reaction yield Low-level problems, achieve excellent catalytic cracking effect, reduce other side reactions, and reduce the effect of reaction temperature

Active Publication Date: 2021-11-12
JIANGSU YUXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A novel method for catalytic cracking of α-acetyl-γ-butyrolactone
  • A novel method for catalytic cracking of α-acetyl-γ-butyrolactone
  • A novel method for catalytic cracking of α-acetyl-γ-butyrolactone

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Experimental program
Comparison scheme
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 the pulsation to ...

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 for α-acetyl-γ-butyrolactone. Heater; after the replacement process is completed, the system is vacuumed and other steps. The present invention adopts a unique external circulation pulsating reactor and a pulsating conveying external circulation mode, which greatly promotes the mass transfer between the various reactant species in the reactor, so that the reaction can be under kinetic control, and the reaction can be achieved through the pulsation mode. The mass transfer rate is further increased by more than an order of magnitude. The combined catalyst adopted in the present application has high catalytic efficiency, high activity and high selectivity, which not only reduces the reaction temperature, but also reduces other side reactions of cracking at high temperature, reduces energy consumption and costs at the same time.

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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Patent Type & Authority Patents(China)
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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