Continuous crystallizing and centrifuging system for producing phosphorous acid

A phosphorous acid and crystallization technology, applied in the chemical industry, can solve problems such as low production efficiency, environmental pollution of equipment, and heavy acid fog in production workshops, and achieve the effects of reducing equipment investment, improving production efficiency, and shortening crystallization time

Inactive Publication Date: 2014-10-01
JIANGSU DAMING TECH
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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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  • Continuous crystallizing and centrifuging system for producing phosphorous acid

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Embodiment Construction

[0011] As shown in the accompanying drawings, a continuous crystallization centrifuge system for phosphorous acid production disclosed by the present invention includes a concentration kettle 1, a condenser 2, a crystallizer 3, a centrifuge 4, and a circulation pump 5. The concentration kettle 1 is connected to the condenser through the circulation pump 5 The condenser 2 is connected to the crystallizer 3 through pipelines, and the crystallizer 3 is connected to the centrifuge 4 and the vacuum absorption device 6 respectively through pipelines, and the circulating pump 5 and the centrifuge 4 are all connected to each other with the mother liquor tank 7 through pipelines. The crystallizer 3 is divided into a clear liquid area 31, a settling area 32, and a crystallization area 33 from top to bottom. A simple baffle plate 321 is provided in the settling area 32, and a guide tube 322 is arranged in the simple baffle plate 321 to guide the flow. A stirring bar 323 is arranged in the...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163
Inventor 潘小明嵇颖耀魏泽军李雪飞
Owner JIANGSU DAMING TECH
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