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Reactive distillation column and method for reactive distillation and pyrolysis of alkylphenol

A reactive distillation column and reactive distillation technology are applied in the field of reactive distillation and pyrolysis of alkylphenol, which can solve the problems of complicated procedures, capital, difficult separation and low efficiency, and achieve the effects of reducing pollution, simplifying operation and saving time.

Inactive Publication Date: 2015-04-01
东营海源化工股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this operation process has significant defects: the mixture of catalyst and mixed phenol is difficult to separate
The disposal of these wastes requires complicated procedures and a lot of money
Also, the entire process is an inefficient batch operation

Method used

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  • Reactive distillation column and method for reactive distillation and pyrolysis of alkylphenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Use a reactive distillation tower, the reaction section is filled with ZSM-5 molecular sieve, the rectification section is equipped with wire mesh packing, and 4M with a purity ≥ 99.5% is used as the raw material. The raw material enters the reaction section of the tower after being vaporized in the vaporizer, and the pressure tower is operated. Top-0.09MPa, operating temperature tower top 130°C, tower bottom 160°C, reflux ratio 1.0. After reactive distillation, the mixture of isobutene and p-cresol at the top of the tower passes through a gas-liquid separator to obtain isobutene with a purity of ≥99.9% and p-cresol with a purity of ≥99.5%.

Embodiment 2

[0019] Use a reactive distillation tower, the reaction section is filled with ZSM-5 molecular sieve, the rectification section is equipped with wire mesh packing, and 4M with a purity ≥ 99.5% is used as the raw material. The raw material enters the reaction section of the tower after being vaporized in the vaporizer, and the pressure tower is operated. Top-0.05MPa, operating temperature tower top 200°C, tower bottom 230°C, reflux ratio 3.0. After reactive distillation, the mixture of isobutene and p-cresol at the top of the tower passes through a gas-liquid separator to obtain isobutene with a purity of ≥99.9% and p-cresol with a purity of ≥99.5%.

Embodiment 3

[0021] Use a reactive distillation tower, the reaction section is filled with ZSM-5 molecular sieve, the rectification section is equipped with wire mesh packing, and 4M with a purity ≥ 99.5% is used as the raw material. The raw material enters the reaction section of the tower after being vaporized in the vaporizer, and the pressure tower is operated. Top-0.07MPa, operating temperature tower top 160°C, tower bottom 190°C, reflux ratio 1.5. After reactive distillation, the mixture of isobutene and p-cresol at the top of the tower passes through a gas-liquid separator to obtain isobutene with a purity of ≥99.9% and p-cresol with a purity of ≥99.5%.

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Abstract

The invention discloses a reactive distillation column for reactive distillation and pyrolysis of alkylphenol. The interior of the drum of a same distillation column is isolated by virtue of a perforated plate, a distillation section is formed on the upper part of the distillation column and a reaction section is formed on the lower part; above the perforated plate, the interior of the column drum is filled with filler and is mounted with a column plate, so that the distillation section functioning as distillation and separation is formed; below the perforated plate, the interior of the column drum is filled with a pyrolysis catalyst, so that the reaction section for the pyrolysis of alkylphenol is formed; a material outlet is formed in the distillation section, and a material inlet is formed in the reaction section. By virtue of the reactive distillation column, the alkylphenol which is heated and gasified in a gasifier enters into the reaction section in the column by virtue of the material inlet, partial alkylphenol participates in pyrolysis in the reaction section under the effect of the pyrolysis catalyst so as to generate isobutylene and cresol, and the generated isobutylene and cresol, together with rest unreacted alkylphenol, move upwards, enter into the distillation section by virtue of the perforated plate and are separated from the alkylphenol in the distillation section; the isobutylene and cresol separated from the alkylphenol continue to move upwards and participate in gas-liquid separation in a gas-liquid separator, so that isobutylene and cresol are obtained.

Description

technical field [0001] The invention relates to a method for pyrolyzing alkylphenols by reactive distillation, which is especially suitable for preparing corresponding high-purity phenols from alkylphenols. Background technique [0002] Various phenolic compounds are important chemical raw materials, especially high-purity alkylphenols, which are necessary raw materials for synthesis in the fields of medicine, pesticides, flavors, and additives. At present, there are two main methods for industrial production of various alkylphenols, one is the synthesis method, and the other is the separation method. The synthesis method has the advantages of simple product components and easy purification, but has the disadvantages of rare raw materials, high price, and complicated process; while the separation method uses chemical and physical methods to separate and purify alkylphenols in coal tar or ethylene tar. The advantage is that the raw materials are sufficient and easy to obtain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01J8/02C07C39/07C07C37/74C07C37/52C07C11/09C07C7/04C07C1/20
CPCY02P20/10
Inventor 张力擎刘锋李崇张大治赵秋云王芳张曾刘彦丰
Owner 东营海源化工股份有限公司