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Method of preparing trisodium phosphate by using wet-process phosphoric acid

A technology of trisodium phosphate and wet-process phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as unstable product quality, long process lines, and high energy consumption

Inactive Publication Date: 2014-05-14
GUIYANG KAILIN FERTILIZER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing trisodium phosphate with wet-process phosphoric acid, which solves the problems of long process lines, unstable product quality, high energy consumption, and difficult to handle by-products in the existing trisodium phosphate production technology. environmental issues

Method used

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  • Method of preparing trisodium phosphate by using wet-process phosphoric acid
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  • Method of preparing trisodium phosphate by using wet-process phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Impurity removal of wet-process phosphoric acid:

[0049] The solid impurities contained in the wet-process phosphoric acid with a concentration of 15% are removed by centrifugation or press filtration to obtain phosphoric acid for subsequent use;

[0050] (2) Synthesis reaction of intermediates:

[0051] Put the phosphoric acid obtained in step (1) into the intermediate synthesis tank, adjust the concentration of phosphoric acid, heat up to 60°C, and add carbonamide and phosphoric acid under stirring conditions to carry out the synthesis reaction. The amount of carbonamide added is based on the mole of phosphoric acid The ratio is 1.06:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 80min;

[0052] (3) Cooling and crystallization to obtain the intermediate:

[0053] After the synthesis reaction is completed, put the obtained intermediate slurry into the cooling crystallization tank and cool it to a temperature of 20°C to ...

Embodiment 2

[0057] (1) Impurity removal of wet-process phosphoric acid:

[0058] The solid impurities contained in the wet-process phosphoric acid with a concentration of 40% are removed by centrifugation or press filtration to obtain phosphoric acid for subsequent use;

[0059] (2) Synthesis reaction of intermediates:

[0060] Put the phosphoric acid obtained in step (1) into the intermediate synthesis tank, adjust the concentration of phosphoric acid, heat up to 70°C, and add carbonamide and phosphoric acid under stirring conditions to carry out the synthesis reaction. The amount of carbonamide added is based on the mole of phosphoric acid The ratio is 1.04:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 100min;

[0061] (3) Cooling and crystallization to obtain the intermediate:

[0062] After the synthesis reaction is completed, put the obtained intermediate slurry into the cooling crystallization tank to cool to a temperature of 30°C, centr...

Embodiment 3

[0066] (1) Impurity removal of wet-process phosphoric acid:

[0067] The solid impurities contained in the wet-process phosphoric acid with a concentration of 50% are removed by centrifugation or press filtration to obtain phosphoric acid for subsequent use;

[0068] (2) Synthesis reaction of intermediates:

[0069] Put the phosphoric acid obtained in step (1) into the intermediate synthesis tank, adjust the concentration of phosphoric acid, heat up to 80°C, and add carbonamide and phosphoric acid under stirring conditions to carry out the synthesis reaction. The amount of carbonamide added is based on the mole of phosphoric acid The ratio is 1.08:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 60min;

[0070] (3) Cooling and crystallization to obtain the intermediate:

[0071] After the synthesis reaction is finished, put the obtained intermediate slurry into the cooling crystallization tank to cool to a temperature of 40°C, centrif...

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Abstract

The invention discloses a method of preparing trisodium phosphate by using wet-process phosphoric acid. The method comprises the following steps: reacting carbomite with wet-process phosphoric acid to obtain an intermediate; and reacting the intermediate with sodium hydroxide to obtain a trisodium phosphate product. The method disclosed by the invention is short in process line, low in energy consumption, stable in product quality, low in production cost, convenient to operate and safe in production. Byproduct slurry can be further fully recycled. The whole production process is environment-friendly, clean and pollution-free, free of discharge of exhaust gases, wastewater and waste residues, responds to the policy of energy conservation, emission reduction and clean production, and overcomes the problems of complex process, unstable product quality, high energy consumption, environmental pollution and the like in the prior art. The purity of the obtained trisodium phosphate product is more than or equal to 98%.

Description

technical field [0001] The invention relates to a method for preparing trisodium phosphate with wet-process phosphoric acid, which belongs to the technical field of chemical industry. Background technique [0002] Trisodium phosphate is used as water softener and detergent, metal descaling agent, boiler antiscaling agent, water softener in paper dyeing, and adhesive for production of glossy paper in chemical industry, textile, printing and dyeing, papermaking, power generation and other industries. pH buffering agent, color fixing agent in printing and dyeing, fabric mercerizing enhancer, rubber latex coagulant; it can improve the complex metal ion, pH value of food, increase ionic strength, etc., and can also improve the binding force and durability of food watery. In the prior art, the production methods of trisodium phosphate include hot method phosphoric acid method and wet method phosphoric acid method. The thermal phosphoric acid method is a neutralization reaction b...

Claims

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Application Information

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IPC IPC(8): C01B25/30
Inventor 朱飞武廖吉星彭宝林刘琼韩朝应张金萍张意徐园
Owner GUIYANG KAILIN FERTILIZER CO LTD
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