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Method for preparing benzophenone

A benzophenone and valve technology, applied in the field of benzophenone preparation, can solve the problems of many by-products, complicated preparation methods, etc., and achieve the effects of less by-products, simple preparation method, and shortened process flow

Inactive Publication Date: 2017-02-15
连云港德洋化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the phosgene method uses phosgene and benzene as raw materials, uses Lewis acid as a catalyst, carries out Friedel-Crafts reaction, and prepares benzophenone through hydrolysis, layering treatment, refining, etc., and the preparation method is cumbersome now, and there are many by-products

Method used

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Examples

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Effect test

preparation example Construction

[0013] A preparation method of benzophenone, the steps are as follows:

[0014] (1) Prepare materials, put benzene, quantitative catalyst and acyl chloride into the pre-reaction kettle, turn on the condenser to cool water, start stirring, turn on the steam to raise the temperature to 50°C and stop heating, keep reflux stirring at 60±3°C for 30 minutes, stop stirring for pre-heating The reaction is over;

[0015] (2) Feeding, the prepared materials are transported to the synthesis reactor through the feed valve, and the pressure in the reactor will increase as the temperature of the synthesis reactor rises. When the pressure rises to 0.20Mpa, adjust the heat transfer oil valve, open the exhaust valve of the flow meter, and after checking that everything is normal, continue to raise the temperature slowly. When the pressure slowly rises to 0.70-0.80MPa and the temperature is 160°C, further increase the exhaust valve to exhaust, and strictly control the heating speed and exhaust...

Embodiment 1

[0022] A preparation method of benzophenone, the steps are as follows:

[0023] (1) Prepare materials, put benzene, quantitative catalyst and acid chloride into the pre-reaction kettle, turn on the condenser to cool water, turn on stirring, turn on the steam to raise the temperature to 50°C and stop heating, keep stirring at 60°C for 30 minutes, stop stirring and the pre-reaction is over ;

[0024] (2) Feeding, the prepared materials are transported to the synthesis reactor through the feed valve, and the pressure in the reactor will increase as the temperature of the synthesis reactor rises. When the pressure rises to 0.20Mpa, adjust the heat transfer oil valve, open the exhaust valve of the flow meter, and after checking that everything is normal, continue to raise the temperature slowly. When the pressure slowly rises to 0.70-0.80MPa and the temperature is 160°C, further increase the exhaust valve to exhaust, and strictly control the heating speed and exhaust volume by adj...

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PUM

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Abstract

The invention discloses a method for preparing benzophenone. The method is characterized by comprising the following steps: (1) preparing materials, that is, adding benzene, quantitative catalysts and acyl chloride into a pre-reaction kettle, starting a condenser for cooling water, and stirring; (2) feeding, that is, conveying the prepared materials into a synthesis reactor by a feeding valve, wherein the pressure in the reactor is increased when the temperature of the synthesis reactor rises; (3) washing, and starting to stir and heat; (4) desolventizing, opening the feeding valve after receiving a washing station notification, feeding into a desolvation kettle, and closing the feeding valve after completing feeding; and (5) distilling, sucking the materials into a distillation mid-autoclave after desolvation, opening an air release valve of the distillation mid-autoclave, and regulating a mid-autoclave heating valve. The invention has the advantages that the preparation method has the advantages of simplicity, fewer byproducts, zero pollution and capacity of performing batch production.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of benzophenone. Background technique [0002] Benzophenone is a white shiny prismatic crystal. It smells like roses. sweetness. 1G is soluble in 7.5ml ethanol, 6ml ether, soluble in chloroform, insoluble in water. Relative density (d504) 1.0869. The melting point is 48.5°C. The boiling point is 305.4°C. Refractive index (n45.2D) 1.5975. The flash point is 138°C. Irritant, benzophenone is an intermediate of ultraviolet absorbers, organic pigments, medicines, spices, and insecticides. In the pharmaceutical industry, it is used to produce dicyclohexyl piperidine, benzotropine hydrobromide, diphenhydramine hydrochloride, etc. This product itself is also a styrene polymerization inhibitor and a fragrance fixative. It can endow the essence with a sweet smell, and is used in various perfumes and soap essences. It can be used to prepare almond, ...

Claims

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Application Information

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IPC IPC(8): C07C45/46C07C45/78C07C49/786
CPCC07C45/46C07C45/78C07C49/786Y02P20/141
Inventor 孙成全
Owner 连云港德洋化工有限公司
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