Continuous crystallizing and centrifuging system for producing phosphorous acid

Abstract

The invention discloses a continuous crystallizing and centrifuging system for producing phosphorous acid. The system comprises a concentration kettle, a condenser, a crystallizer, a centrifugal machine and a circulating pump, and is characterized in that the concentration kettle is connected with the condenser by virtue of the circulating pump; the condenser is connected with the crystallizer by virtue of a pipeline; the crystallizer is connected with the centrifugal machine by virtue of a pipeline. According to the system, the defect of the prior art is overcome, the crystallizing time is greatly shortened, the production efficiency is improved, the energy consumption is reduced, the equipment investment is reduced, the pollution to human, equipment and environment in the operation process is reduced, and the system is safe and environment-friendly.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a continuous crystallization centrifugal system for phosphorous acid production. Background technique [0002] Phosphorous acid is a dibasic acid with reducing properties. It is used as a raw material for the manufacture of phosphite, pesticide intermediates, and organic phosphorus water treatment agents. It is also used as a plastic stabilizer or antioxidant. At present, the production methods of phosphorous acid mainly include phosphorus trichloride hydrolysis method and dimethyl phosphite residue hydrolysis method. No matter which production method is adopted, the finished product must be obtained through concentration, crystallization, centrifugation and other processes. The existing domestic production The manufacturer's crystallization centrifugation process is to put the concentrated material into several crystallization kettles, and then centrifuge it with coo...

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Problems solved by technology

At present, the production methods of phosphorous acid mainly include phosphorus trichloride hydrolysis method and dimethyl phosphite residue hydrolysis method. No matter which production method is adopted, the finished product must be obtained through concentration, crystallization, centrifugation and other processes. The existing domestic production The manufacturer's crystallization centrifugation process is to put the concentrated material into several crystallization kettles, and then centrifuge it with cooling water to cool down and crystallize while stirring. The mother liquor after centrifugation is recycled into the concentration kettle. Low energy consumption, large equipment investment, heavy acid mist in the production workshop, and great pollution to human body, equipment and environment

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