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Method for producing waste acids to prepare high-content phosphorous acid

A phosphorous acid, high-content technology, applied in phosphorous acid, chemical instruments and methods, phosphorus oxyacids, etc., can solve the problems of no reasonable and effective industrialized treatment method for waste acid, environmental protection difficulties, etc., and achieve great economic benefits and environmental protection. Benefit, the effect of protecting the environment

Inactive Publication Date: 2018-04-06
HUNAN BIDE BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no reasonable and effective industrial treatment method for this waste acid, which is a major problem in environmental protection.

Method used

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  • Method for producing waste acids to prepare high-content phosphorous acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The waste acid is transported to the falling film evaporator, the water in the waste acid is evaporated, and hydrogen chloride is taken out, the concentration of the phosphorous acid concentrate is 90%, and it enters the enamel kettle; add 5% of the falling film concentrate to the enamel kettle Activated carbon, 30% water by volume, kept stirring at 70°C for 2 hours, cooled to 30°C, discharged and centrifuged, activated carbon residue was incinerated as solid waste to recover metal chloride, and the filtrate entered the storage tank.

[0040] Use a metering pump to transport the filtrate to a two-stage countercurrent extraction tower, use tertiary amine kerosene solution as the extraction agent, the volume percentage of tertiary amine is 20%, the volume flow ratio of tertiary amine solution and phosphorous acid concentrated solution is 1:2, and the residence time For 2 minutes, the raffinate phase enters the storage tank, and the extractant enters the two-stage stripping...

Embodiment 2

[0043] The process of this embodiment is identical with embodiment 1, just change the concentration of phosphorous acid concentrated solution in control step 1) to be 95%, finally obtain phosphorous acid finished product, appearance is white crystal, after inspection, phosphorous acid content is 98.6%, chlorine The ion content is 0.003%, which meets the quality requirements of the national standard HG / T2520-2006 first-class product.

Embodiment 3

[0045] The process of this embodiment is the same as that of Example 1, except that decolorization is not carried out without adding hydrogen peroxide, and the finished product of phosphorous acid is obtained. National standard HG / T2520-2006 quality requirements for first-class products.

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Abstract

The invention provides a method for producing waste acids to prepare high-content phosphorous acid. The method comprises the following steps: concentrating most of the hydrogen chloride in the waste acids by performing falling film evaporation, adsorbing metal ions by activated carbon, extracting to remove the chloride ion after tertiary amine and kerosene complexing, and performing vacuum spray drying, thereby obtaining the finished phosphorous acid. Aiming at recycling of the waste acid, the phosphorous acid and hydrochloric acid which can be directly utilized are refined from the waste acids, and synergetic development among the economy, society and environmental protection is realized.

Description

technical field [0001] The invention relates to the field of resource treatment of waste acid produced by organic synthesis, and particularly relates to a method for producing high-content phosphorous acid from waste acid. Background technique [0002] Chlorine substitution of hydroxyl is a very important chemical reaction. The production process using phosphorus trichloride as the chlorination agent is widely used in chemical production due to mild reaction conditions and low raw material costs. [0003] At present, the process of reacting phosphorus trichloride with alcohol to generate chlorinated alkanes mainly uses metal chlorides such as zinc chloride, copper chloride, and aluminum chloride as catalysts, and phosphorus trichloride is added dropwise to the mixture of alcohol and hydrochloric acid. Keep a certain reaction temperature for chlorination reaction. After the reaction is over, add an appropriate amount of water to the reaction kettle, let it stand for stratific...

Claims

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Application Information

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IPC IPC(8): C01B25/163C01B7/07
CPCC01B7/0712C01B25/163C01P2006/80
Inventor 李华轩欧亚周王争王宇
Owner HUNAN BIDE BIOTECH
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