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Preparation method of 2, 6-dichlorobenzaldehyde

A technology of dichlorobenzaldehyde and dichlorotoluene, applied in hydrolysis to prepare carbonyl compounds, organic chemistry, etc., can solve the problems of not being able to meet the market demand, difficult production control, high cost, etc., and achieve the reduction of solid waste and low production cost , The effect of less raw material consumption

Active Publication Date: 2013-11-20
永椿化工新材料有限公司
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Problems solved by technology

[0003] The synthetic method of existing 2,6-dichlorobenzaldehyde has toluene direct chlorination method, p-nitrotoluene method, o-nitrotoluene method, p-tert-butyltoluene method, o-toluenesulfonyl chloride chlorination decomposition method etc., but The defects in the production of the above various 2,6-dichlorobenzaldehyde are: difficult production control, low output, high cost, and cannot be suitable for its market demand

Method used

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Embodiment Construction

[0016] Production steps:

[0017] 1. First add 750kg 2,6-dichlorotoluene and 3-15kg phosphorus pentachloride to the reactor, then turn on the light source (luminous flux is 50000~500000lm, color temperature is 1000~6000k), and pass high temperature steam into the jacket , Make the temperature in the reactor reach 80-120 ℃, and at the same time inject chlorine gas at a ventilation rate of 25 to 40 kg / h. After 1 to 10 hours, increase the temperature to 100 to 150 ℃ in the reactor, and at the same time to Chlorine gas was introduced at a ventilation rate of 80 kg / h, and after another 0.5 to 2 hours, chlorine gas was introduced at a ventilation rate of 40-50 kg / h, and the reaction was kept warm until the reaction was completed.

[0018] Turn off the chlorine, absorb the generated hydrogen chloride gas, and absorb the generated hydrochloric acid with water, which can be sold as a by-product.

[0019] By passing low-temperature water into the jacket, the pressure in the reactor is control...

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Abstract

The invention provides a preparation method of 2, 6-dichlorobenzaldehyde and relates to the technical field of chemical synthesis production. The preparation method of the invention comprises the following steps of: performing a chlorination reaction on 2,6-dichlorotoluene and chlorine under a reaction condition of 50-250 DEG C in the catalytic effect of phosphorus pentachloride and light, and performing rectification to prepare 2,6-dichloro dchlorobenzyl; adding the 2,6-dichloro dchlorobenzyl, an acidic solvent and zinc chloride into a hydrolysis nitrilation kettle, and performing a hydrolysis reaction under a heating reflux condition to prepare the 2, 6-dichlorobenzaldehyde. The preparation method provided by the invention has the advantages of ensuring easy production control, little material consumption and low production cost, reducing the generation of solid waste and reducing the emission of nitrogen-containing nitroso group waste, thereby being an energy-saving, emission-reducing, environment-friendly, industrial, practical and clean production process.

Description

Technical field [0001] The invention relates to the technical field of chemical synthesis production. Background technique [0002] 2,6-Dichlorobenzaldehyde, molecular formula: C 7 H 4 Cl 2 O, the molecular weight is 175.01, the finished product is white to yellow needle-like crystals, with a strong odor, mp68-72℃, soluble in ethanol, ether, petroleum ether, used in the synthesis of dyes, pesticides and pharmaceutical intermediates, and used as sterilization on pesticides Used in the manufacture of herbicide 2,6-dichlorobenzonitrile, and used in the production of acid mordant bleach B on dyes. Used in the pharmaceutical industry to prepare diclofenac sodium. 2,6-Dichlorobenzaldehyde is also an important intermediate in the synthesis of benzoyl urea pesticides. It is used to synthesize the next intermediate 2,6-dichlorobenzaldehyde oxime, and finally obtain hexaflumuron. Pesticide varieties such as chlorfenuron, flufenuron and lufenuron. [0003] The current synthesis methods of ...

Claims

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Application Information

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IPC IPC(8): C07C47/55C07C45/43
Inventor 陈国云王瑛王晨潘明生刘润兴
Owner 永椿化工新材料有限公司
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