Molecular sieve-based composite material for purification of phosphorous acid and preparation method thereof

A composite material and molecular sieve technology, which is applied in the fields of molecular sieve-based composite materials and its preparation, molecular sieve-based composite materials for the purification of phosphorous acid and its preparation. The method is simple, the cost of production and use is reduced, and the preparation technology is simple and convenient

Inactive Publication Date: 2009-08-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure and properties of orthophosphoric acid and phosphorous acid are very similar, so the purification of phosphorous acid mother liquor has become a technical bottleneck and a difficult problem
[0003] At present, the process and technology of phosphorus removal are all related to the field of sewage treatment technology. Literature research, including scientific papers and patents, has not found any relevant reports that mention phosphorus removal technology in phosphorous acid products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take by weighing ZSM-5 molecular sieve 5g, join in 160ml 20%Mn (NO 3 ) 2 In the solution, stirring and reacting at 95° C. for 4 h to carry out ion exchange, and then the reaction liquid was subjected to solid-liquid separation. After the obtained solid was washed with water, the same second and third ion exchange reactions were carried out. After the reaction, the molecular sieves were filtered, washed, dried, and calcined at 350° C. for 5 hours.

Embodiment 2

[0017] Take by weighing ZSM-11 molecular sieve 5g, join in 160ml 30%Mg(NO 3 ) 2 In the solution, stirring and reacting at 98° C. for 6 h to carry out ion exchange, and then the reaction liquid was subjected to solid-liquid separation. After the obtained solid was washed with water, the same second ion exchange reaction was carried out. After the reaction, the molecular sieve was filtered, washed, dried, and calcined at 400° C. for 4 hours.

Embodiment 3

[0019] Take by weighing ZSM-5 molecular sieve 10g, join in 300ml 40%Zn (NO 3 ) 2 In the solution, stirring and reacting at 90° C. for 2 h to carry out ion exchange, and then the reaction liquid was subjected to solid-liquid separation. After the obtained solid was washed with water, the same second, third and fourth ion exchange reactions were carried out. After the reaction, the molecular sieves were filtered, washed, dried and calcined at 450° C. for 3 hours.

[0020] Embodiment 1-3 phosphorous acid purification efficiency result is as follows:

[0021] Weigh 5 g of the molecular sieve-based composite material prepared in Examples 1-3, 1 g of the circulating mother liquor of phosphorous acid to be treated (with a phosphate content of 4%), stir and mix at room temperature for 30 minutes, filter, carry out elemental analysis and national standard Turbidity test, the results show that the molecular sieve-based composite material prepared in Example 1 can reduce the phosphate ...

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PUM

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Abstract

The invention relates to the technical field of composite materials, and provides a molecular sieve based composite material for purifying phosphorous acid and a method for preparing the same. The composite material comprises the following raw materials in percentage by weight: 2 to 8 percent of metal cations capable of adsorbing a phosphate radical, and 92 to 98 percent of ZSM series zeolite molecular sieve, wherein the metal cations capable of adsorbing the phosphate radical is loaded on the ZSM series zeolite molecular sieve by ion exchange and calcination technique. The composite material and the preparation method have the advantages that: the preparation process is simple, the highly efficient selective adsorption of by products of the phosphoric acid is realized by utilizing the low-cost technique, other ionic impurities are not introduced, and the quality grade and the market competition force of the phosphorous acid crystal product are improved by lowering the content of the by products of the phosphoric acid in a mother solution of the phosphorous acid.

Description

technical field [0001] The invention relates to a molecular sieve-based composite material in the technical field of composite materials and a preparation method thereof, in particular to a molecular sieve-based composite material for purification of phosphorous acid and a preparation method thereof. Background technique [0002] Phosphorous acid is a low-oxygen acid of phosphorus. It is mainly used as a synthetic industrial water treatment agent, polymer stabilizer, and raw material for pesticide intermediates. It is one of the important organic phosphorus intermediates. The industrial production of phosphorous acid is mainly based on the hydrolysis of phosphorus trichloride, that is, a certain amount of water and a small amount of saturated phosphorous acid solution are added in proportion to the reaction kettle, and the phosphorus trichloride solution is slowly added, and the hydrogen chloride waste gas generated by the reaction passes through the condenser. After cooling...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30C01B25/163
Inventor 乔秀颖张雷孙康
Owner SHANGHAI JIAO TONG UNIV
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