Chloroacetic acid producing method and reaction equipment thereof

Abstract

The invention provides a chloroacetic acid producing method and reaction equipment thereof; the producing method comprises the steps of: adding acetic acid and acetic anhydride which is equivalent to 10 to 15 percent of acetic acid into a reaction kettle, raising the temperature to 80 to 100 DEG C and keeping the temperature, introducing chlorine under normal pressure for chlorination with the aidof microwaves, distilling acetyl chloride and chloroactic acid liquid from the reaction products by the reduced pressure distillation, putting the chloroactic acid liquid into a soft container and causing the chloroactic acid liquid to crystallize naturally in shaking state. The reaction equipment comprises a reaction kettle provided with an enamel lining and a reflux condenser; the reaction kettle is internally provided with a chlorine pipe which is externally sleeved with a fluid director; a microwave generator is arranged at the end opening of the reaction kettle; an emission head of the microwave generator irradiates reactants in the reaction kettle. The invention has simple technology, safe and reliable equipment, low cost, short production period, high yield and high quality of chloroactic acid products with a purity rate higher than 99.5 percent. The invention reduces the production of an impurity of dichloroacetic acid, thus saving a separation process and being beneficial tothe environment protection.

Description

technical field [0001] The invention belongs to the technical field of chloroacetic acid production, and in particular relates to a method and equipment for producing chloroacetic acid under the assistance of microwaves. Background technique [0002] Chloroacetic acid is an important organic fine chemical raw material, which is widely used in pesticides, medicines, dyes, oilfield chemicals, paper chemicals, textile auxiliaries, surfactants, electroplating, fragrances and flavors and other fields. With the progress and development of science and technology, new application fields of chloroacetic acid will be gradually developed, and the production and market prospects of chloroacetic acid are very promising. At present, the method of producing chloroacetic acid at home and abroad is mainly the acetic acid catalytic chlorination method, which is divided into batch production and continuous production. The batch production process generally uses sulfur powder as a catalyst, an...

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Problems solved by technology

But the deficiency of this patent is, reactant can not react completely, when reacting to 70~80% of theoretical value of acetic acid, need to stop, and also produce 2% dichloroacetic acid impurity along with reaction, this not only brings trouble to the product separation of rear part Inconvenient to come, increase processing costs, and cause serious pollution to the environment, affecting product quality

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