Circulation flow reaction device for producing phosphorus oxychloride by oxygen oxidation process

Abstract

The invention relates to a circulation flow reaction device for producing phosphorus oxychloride by an oxygen oxidation process. The circulation flow reaction device comprises a reaction kettle, a circulating pump and a heat exchanger, wherein a feed port is arranged in the left side of the top of the reaction kettle and a discharge port is arranged in the bottom end of the reaction kettle; the discharge port is provided with a connecting pipeline which is connected with the bottom end of the heat exchanger; the connecting pipeline, which is positioned between the discharge port in the bottom end of the reaction kettle and the bottom end of the heat exchanger, is provided with the circulating pump; the top of the heat exchanger is provided with a connecting pipeline which extends into a feed port arranged in the right side of the top of the reaction kettle and is connected with a material spray distributor arranged in the reaction kettle; and an air inlet is drilled in the center of the top of the reaction kettle and is internally provided with a vertical pipeline which extends into the near bottom of the reaction kettle and is connected with an oxygen distributor. According to the circulation flow reaction device, as the material spray distributor and the oxygen distributor are arranged in the reaction kettle, oxygen molecules can be effectively and fully in contact with phosphorus oxychloride molecules, therefore, the reaction probability is increased, the reaction time is shortened, and the yield and the device availability are increased.

Description

technical field [0001] The invention relates to a device for producing phosphorus oxychloride, in particular to a circulation reaction device for producing phosphorus oxychloride by an oxygen oxidation method. Background technique [0002] Phosphorus oxychloride is widely used in the chemical industry, and is an important raw material for pesticides, flame retardants, dye intermediates, and also has many applications in the electronics industry and solar energy industry. [0003] In China, phosphorus oxychloride was mostly produced by chlorination and hydrolysis of phosphorus trichloride in the past, and the oxygen oxidation method of phosphorus trichloride was gradually developed after the 1990s. Oxygen oxidation method to produce phosphorus oxychloride is characterized by directly feeding oxygen into phosphorus trichloride for reaction. This is an exothermic reaction. Because the reaction is simple and does not produce by-products, it is easy to control and has a high yiel...

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Problems solved by technology

[0004] In the prior art circulation process, there are generally only reactors, heat exchangers, and circulating pumps, and the reactors are simply provided with feed inlets and outlets. The mixed reaction of materials and oxygen is insufficient, and the reaction probability is low. The production time is long, and the production efficiency needs to be improved

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