Cascade-pressurization hydrolysis reaction process and system for benzyl alcohol

A hydrolysis reaction, benzyl alcohol technology, applied in the directions of organic chemistry, preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of high dibenzyl ether by-product, large equipment size, and high equipment material requirements, and achieves Universality, low equipment corrosion rate, and the effect of reducing construction costs and production costs

Pending Publication Date: 2020-02-11
LUXI CHEM GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the main production process of benzyl alcohol is multi-pot series atmospheric pressure hydrolysis reaction process, which has the characteristics of long reaction time (8-10h), high by-product rate of dibenzyl ether, high energy consumption, and large equipment specifications; continuous production process The reaction needs to be carried out under high temperature and high pressure conditions. Raw materials such as benzyl chloride and soda ash have a high corrosion rate on equipment under high temperature and high pressure conditions, and the requirements for equipment materials are high.

Method used

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  • Cascade-pressurization hydrolysis reaction process and system for benzyl alcohol

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Effect test

Embodiment 1

[0043] Such as figure 1 Shown, 11% soda ash solution (mass fraction) according to 0.57m 3 The feed amount per hour is pressurized to 0.3Mpa by the soda ash delivery pump and then sent to the soda ash preheater, and the material extracted by the tower reactor is preheated to 120°C.

[0044] Such as figure 1 Shown, benzyl chloride according to 0.14m 3The feed amount per hour, the soda ash solution pressurized and preheated by the benzyl chloride delivery pump enters the pipeline mixer, and is fully contacted and mixed in the pipeline mixer before being transported to the benzyl alcohol pressurized tower reactor. The reaction materials flow from top to bottom in the tower reactor, and the reaction residence time is 10 minutes. The reaction temperature is 135°C, and the reaction pressure is 0.25Mpa.

[0045] Such as figure 1 As shown, the carbon dioxide gas is decompressed by the pressure reducing valve and sent to the atmospheric pressure hydrolysis tank for buffering, and t...

Embodiment 2

[0049] A pressurized hydrolysis reaction system for benzyl alcohol, comprising: a preheater 5, a mixer 6, a pressurized tower reactor 7, a heater 9, a hydrolysis kettle 10, a condenser 12; the preheater 5, the mixer 6. The pressurized tower reactor 7, the hydrolysis kettle 10, and the condenser 12 are connected in sequence, and the liquid outlet at the bottom of the pressurized tower reactor 7 is connected with the liquid inlet of the pressurized tower reactor 7.

[0050] The above-mentioned structural design realizes the combination of pressurized and normal pressure reaction modes. After the reaction, the content of benzyl chloride in the hydrolyzed crude product can be reduced to 0.01%. Moreover, the present invention can be carried out under relatively mild conditions (120-150° C., 0.2-0.5 MPa), reducing the corrosion degree of materials to equipment under high temperature and high pressure, reducing reaction time and increasing reaction rate at the same time.

Embodiment 3

[0052] A pressurized hydrolysis reaction system for benzyl alcohol, comprising: a preheater 5, a mixer 6, a pressurized tower reactor 7, a heater 9, a hydrolysis kettle 10, a condenser 12; the preheater 5, the mixer 6. The pressurized tower reactor 7, the hydrolysis kettle 10, and the condenser 12 are connected in sequence, and the liquid outlet at the bottom of the pressurized tower reactor 7 is connected with the liquid inlet of the pressurized tower reactor 7.

[0053] The feed pipeline of soda ash is provided with the preheater 5, and the temperature of the lye is increased during preheating, thereby improving the subsequent hydrolysis reaction efficiency.

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Abstract

The invention relates to a cascade-pressurization hydrolysis reaction process and system for benzyl alcohol. The process comprises the following steps: subjecting benzyl chloride and a soda ash solution to a rapid reaction in a tower reactor under a low-pressure condition; then further reducing the content of benzyl chloride in the above reactants in a hydrolysis kettle under a normal-pressure condition; and subjecting the obtained crude hydrolysis product of benzyl alcohol to cooling and continuous oil-water separation, and subjecting an oil phase to reduced-pressure crude distillation and rectification to obtain a product. The method has the production characteristics of mild reaction conditions, short reaction time, low dibenzyl ether yield and low requirements on equipment material, can lower project construction cost and production cost, and overcomes the defects of conventional multi-kettle tandem atmospheric pressure hydrolysis production processes and high-temperature high-pressure continuous hydrolysis reaction processes for benzyl alcohol.

Description

technical field [0001] The invention belongs to a stepwise pressurized hydrolysis reaction technology of benzyl alcohol. Benzyl chloride and soda ash solution are hydrolyzed to prepare benzyl alcohol through pressure and normal pressure, which has the advantages of high reaction rate, short reaction time and high by-product rate. Low, low corrosion rate of equipment and so on. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Benzyl alcohol is a colorless liquid with aroma, and is an important organic chemical raw material. It can be used to prepare flavors, paint solvents, photographic developers, polyvinyl chloride stabilizers, pharmaceutical synthesis, synthetic resin so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/124C07C33/22
CPCC07C29/124C07C33/22
Inventor 刘广杰贾永朋杨勇牛玉洁李福成周瑞兵樊祥栋王勤福张英超张永稳渠晓攀
Owner LUXI CHEM GRP
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