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High-purity benzoyl chloride synthesizing process

A technology of benzoyl chloride and synthesis process, applied in the field of high-purity benzoyl chloride synthesis technology, can solve the problems of complicated purification steps, highly toxic phosgene, low process yield and the like, and achieves low cost, easy control and high purity Effect

Inactive Publication Date: 2004-06-30
QUNLI CHEM SHANGHAI
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  • Abstract
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Problems solved by technology

There are many synthesis techniques for benzoyl chloride: benzoyl chloride can be synthesized from benzoic acid and silicon tetrachloride in benzene solution. The sulfuryl chloride synthesis process generates gaseous sulfur dioxide and hydrogen chloride in addition to benzoyl chloride, without any solid by-product residue, so the product is easy to separate and purify, but the cost of raw material thionyl chloride is relatively high. Although it has been researched and developed, it is still It is used for laboratory preparation; the reaction process of benzoic acid and phosgene is suitable for industrial production, the yield is high, and the purification is relatively simple, but phosgene is highly toxic and causes environmental pollution. As people's requirements for environmental quality become more and more High, this process is gradually being phased out

Method used

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Embodiment Construction

[0017] A kind of benzoyl chloride synthesis technology is to use benzoyl chloride as solvent, under the action of catalyst iron trichloride, benzoic acid and trichlorotoluene are co-heated to generate benzoyl chloride.

[0018] The proportioning of materials of benzoyl chloride synthesis technique is:

[0019] Benzoic acid 600kg

[0020] Trichlorotoluene 980kg

[0021] Solvent benzoyl chloride 600kg

[0022] Catalyst Ferric chloride 1.8kg

[0023] Benzoyl chloride synthetic technique is:

[0024] 1) Put 600kg of benzoyl chloride, 600kg of benzoic acid and 1.8kg of powdered anhydrous ferric chloride into a 2000L reaction pot by weight, stir and heat to 60°C, add 980kg of trichlorotoluene dropwise, and the dropping temperature is maintained at 50 -60°C, the dropping time is about 2-3 hours, and react at 60-80°C until no bubbles are generated after the dropping;

[0025] 2) above-mentioned solution is pumped into distillation pot, and underpressure distillation makes benzoyl...

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Abstract

The synthesis process of benzoyl chloride is characterized by that it uses the benzoyl chloride as solvent, under the action of the iron trichloride catalyst the benzene carbonic acid and trichlorotoluene are co-heated so as to obtain the high-purity benzoyl chloride. Besides, said invention also provides its concrete steps for synthesizing high-purity benzoyl chloride. Its product yield is 95%, and its purity is 99.5%.

Description

technical field [0001] The invention relates to a high-purity benzoyl chloride synthesis process Background technique [0002] Benzoyl chloride is an important organic synthesis intermediate and an important benzoylation and benzylation reagent with a wide range of uses. There are many synthesis techniques for benzoyl chloride: benzoyl chloride can be synthesized from benzoic acid and silicon tetrachloride in benzene solution. The sulfuryl chloride synthesis process generates gaseous sulfur dioxide and hydrogen chloride in addition to benzoyl chloride, without any solid by-product residue, so the product is easy to separate and purify, but the cost of raw material thionyl chloride is relatively high. Although it has been researched and developed, it is still It is used for laboratory preparation; the reaction process of benzoic acid and phosgene is suitable for industrial production, the yield is high, and the purification is relatively simple, but phosgene is highly toxic ...

Claims

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Application Information

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IPC IPC(8): C07C51/60C07C63/10
Inventor 孙家乐
Owner QUNLI CHEM SHANGHAI
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