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Method for producing phosphorous acid by using exhaust gas from phosphorus pentachloride preparation

A technology of phosphorus pentachloride and phosphorous acid, applied in the direction of phosphorous acid, phosphorus oxyacid, etc., to achieve good economic benefits

Inactive Publication Date: 2018-11-06
宿州汉泰化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the production process, waste gas composed of chlorine, carbon dioxide, oxygen and dust will be produced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for producing phosphorous acid from waste gas produced by preparing phosphorus pentachloride, comprising the following steps:

[0019] 1) Add deionized water into the stirring tank, and then pass the waste gas produced by the preparation of phosphorus pentachloride into the water in the stirring tank, and continuously carry out stirring treatment during the process of passing the waste gas, wherein, after the stirring treatment is completed, the stirring tank The excess gas in the tank is pumped into another dust-free container for storage, and after the stirring is completed, it is filtered to filter out impurities and obtain filtered liquid;

[0020] 2) Pour the filter solution prepared in step 1) into a heating tank for heat treatment, wherein the heating temperature of the heating treatment is 110°C, so that the filter solution evaporates to one-third of the original volume, and the gas generated by the heat treatment Pump it into another dust-free containe...

Embodiment 2

[0029] A method for producing phosphorous acid from waste gas produced by preparing phosphorus pentachloride, comprising the following steps:

[0030] 1) Add deionized water into the stirring tank, and then pass the waste gas produced by the preparation of phosphorus pentachloride into the water in the stirring tank, and continuously carry out stirring treatment during the process of passing the waste gas, wherein, after the stirring treatment is completed, the stirring tank The excess gas in the tank is pumped into another dust-free container for storage, and after the stirring is completed, it is filtered to filter out impurities and obtain filtered liquid;

[0031] 2) Pour the filtered solution prepared in step 1) into a heating tank for heat treatment, wherein the heating temperature for the heating treatment is 130°C, so that the filtered solution evaporates to one-third of the original volume, and the gas generated by the heating treatment Pump it into another dust-free ...

Embodiment 3

[0040] A method for producing phosphorous acid from waste gas produced by preparing phosphorus pentachloride, comprising the following steps:

[0041] 1) Add deionized water into the stirring tank, and then pass the waste gas produced by the preparation of phosphorus pentachloride into the water in the stirring tank, and continuously carry out stirring treatment during the process of passing the waste gas, wherein, after the stirring treatment is completed, the stirring tank The excess gas in the tank is pumped into another dust-free container for storage, and after the stirring is completed, it is filtered to filter out impurities and obtain filtered liquid;

[0042] 2) Pour the filtered solution prepared in step 1) into a heating tank for heat treatment, wherein the heating temperature for the heating treatment is 120°C, so that the filtered solution evaporates to one-third of the original volume, and the gas generated by the heating treatment Pump it into another dust-free ...

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PUM

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Abstract

The invention discloses a method for producing phosphorous acid by using exhaust gas from phosphorus pentachloride preparation. The method comprises the following steps: 1) adding deionized water in an agitator tank, introducing exhaust gas from phosphorus pentachloride preparation in water in the agitator tank, continuously stirring the material during exhaust gas introduction, after stirring, pumping the superfluous gas in the agitator tank in another dust-free container for preservation, and performing filtering treatment to obtain a filtrate; and 2) dumping the filtrate prepared in the step 1) in a heating tank for heating treatment at the temperature of 110-130 DEG C so that the filtrate is evaporated to 1 / 3 of an original volume, and pumping the gas generated from heating treatment to the another dust-free container for preservation. The method can effectively use the exhaust gas and increases the economic benefit.

Description

technical field [0001] The invention relates to a method for producing phosphorous acid by using the waste gas produced in the preparation of phosphorus pentachloride. Background technique [0002] Phosphorus pentachloride is an inorganic compound. It is one of the most important phosphorus chlorides, along with phosphorus trichloride and phosphorus oxychloride. Pale yellow crystal, with pungent odor, easily sublimated. It is mainly used as a chlorinating agent and can have different structures under different conditions. [0003] Phosphorus pentachloride is generally prepared by the chlorination method. The liquid chlorine is vaporized and passed into a chlorine gas drying tower for dehydration to form dry chlorine gas. The dry chlorine gas is passed into a reactor for chlorination reaction with phosphorus trichloride liquid. The chlorine gas needs Pass through until the solution changes from a paste to a completely dry crystalline product, and then the finished product ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163
CPCC01B25/163
Inventor 不公告发明人
Owner 宿州汉泰化工有限公司