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Novel process for preparing benzyl alcohol by alkali-free continuous hydrolysis of benzyl chloride

A technology of benzyl alcohol and benzyl chloride, applied in the field of preparation of benzyl alcohol, can solve the problems of high generation rate of by-products and high processing cost, and achieve the effects of convenient processing, improved yield and reduced cost

Active Publication Date: 2015-09-23
HUBEI GREENHOME MATERIALS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is used to solve the sodium chloride in the existing process wastewater, and the by-product formation rate is as high as 10-25%.
Dealing with technical issues such as higher costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 0.3Kg benzyltriethylammonium chloride to 1500Kg water, add benzyltriethylammonium chloride aqueous solution and 300Kg benzyl chloride, 20Kg toluene, 20Kg cyclohexane to the equipment equipped with heating, stirring, thermometer and condenser In the reaction kettle, start stirring and heating, start timing when the temperature of the kettle rises to 92°C, and take samples for analysis after 3 hours of reaction. The oil phase contains 34.72% benzyl chloride, 64.28% benzyl alcohol, and 0.94% dibenzyl ether. The reaction liquid is all transferred to the secondary reaction kettle, and 0.3Kg trioctylmethyl ammonium chloride quaternary ammonium salt, 30Kg cumene solvent are added simultaneously and heated, and nitrogen gas is fed to adjust the pressure in the kettle to be 0.6Mpa. When the temperature of the kettle rose to 150°C, timing was started. After 4 hours of reaction, samples were taken and analyzed. The oil phase contained 0.47% benzyl chloride, 97.8% benzyl alcohol...

Embodiment 2

[0021] Add 0.5Kg tetradecyltrimethylammonium chloride into 1500Kg water, add tetradecyltrimethylammonium chloride aqueous solution, 300Kg benzyl chloride, 30Kg toluene, and 30Kg cyclohexane into a heating, stirring, In the reaction kettle with a thermometer and a condenser tube, start stirring and heating. When the temperature of the kettle rises to 92°C, start timing. After 3 hours of reaction, take a sample for analysis. The oil phase contains 35.56% benzyl chloride, 63.26% benzyl alcohol, and dibenzyl chloride. Ether 1.08%. All the reaction liquid was transferred to the secondary reaction kettle, and 40Kg cumene and 0.2Kg trioctylmethyl ammonium chloride quaternary ammonium salt were added at the same time to start stirring and heating, and nitrogen was introduced to adjust the pressure in the kettle to 0.6Mpa. Start timing when the temperature rises to 150°C. After 3 hours of reaction, sampling and analysis show that the oil phase contains 0.45% benzyl chloride, 97.75% ben...

Embodiment 3

[0023] Add 0.5Kg tetradecyltrimethylammonium chloride into 1500Kg water, add tetradecyltrimethylammonium chloride aqueous solution, 300Kg benzyl chloride, 30Kg toluene, and 30Kg cyclohexane into a heating, stirring, In the reaction kettle with a thermometer and a condenser tube, start stirring and heating. When the temperature of the kettle rises to 92°C, start timing. After 8 hours of reaction, take a sample for analysis. The oil phase contains 10.12% benzyl chloride, 85.34% benzyl alcohol, and dibenzyl chloride. Ether 4.28%. All the reaction liquid was transferred to the secondary reaction kettle, and 40Kg cumene and 0.2Kg trioctylmethyl ammonium chloride quaternary ammonium salt were added at the same time to start stirring and heating, and nitrogen was introduced to adjust the pressure in the kettle to 0.6Mpa. Start timing when the temperature rises to 150°C. After 5 hours of reaction, sampling and analysis show that the oil phase contains 0.48% benzyl chloride, 97.66% ben...

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Abstract

The invention relates to a novel process for preparing benzyl alcohol by alkali-free continuous hydrolysis of benzyl chloride. The process comprises the following steps of adding benzyl chloride, pure water and a specific mixed solvent of methylbenzene and cyclohexane into a primary normal-pressure reaction kettle according to a certain proportion, performing reaction for a certain time at certain temperature, continuing transferring a reaction product into a secondary pressure reaction kettle, adding an isopropylbenzene solvent, simultaneously adding methyl trioctyl ammonium chloride quaternary ammonium salt, continuing performing reaction for a certain time, cooling and settling obtained reaction liquid to separate an oil phase and an aqueous phase (containing benzyl alcohol and hydrochloric acid), and performing crude distillation and rectification on the oil phase to obtain a benzyl alcohol finished product. According to the process, a continuous feeding and discharging manner is adopted for reaction, and a corresponding solvent and a corresponding catalyst are combined, so that the yield rate of the product is increased, and the productivity is improved.

Description

technical field [0001] The design of the present invention relates to a preparation method of benzyl alcohol, which mainly includes an industrial production process for preparing benzyl alcohol by alkali-free hydrolysis of benzyl chloride. technical background [0002] With the development of the national economy, the variety and quantity of fine chemical products in my country are showing a rapid growth trend. As an extended product of benzyl chloride, benzyl alcohol is an important organic chemical product and intermediate, widely used in medicine and spices. In addition, due to the continuous development of downstream products of benzyl alcohol, the use of benzyl alcohol will increase significantly. [0003] There are two main production methods of benzyl alcohol: benzaldehyde catalytic reduction method and benzyl chloride hydrolysis method. The catalytic reduction method of benzaldehyde was the main production method from the 1980s to the 1990s. This synthesis method vio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C33/22C07C29/124
CPCC07C29/124C07C33/22
Inventor 毛铤向磊王成
Owner HUBEI GREENHOME MATERIALS TECH INC
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