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Method for preparing sodium dihydrogen phosphate by utilizing phosphoric acid by wet process

A technology of sodium dihydrogen phosphate and wet-process phosphoric acid, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., and can solve problems such as difficult to handle by-products, unfavorable environmental protection, and unstable product quality

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 sodium dihydrogen phosphate with wet-process phosphoric acid, to solve the problem of long process line in the existing sodium dihydrogen phosphate production technology, unstable product quality, high energy consumption, and difficult to handle by-products. Environmental issues

Method used

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  • Method for preparing sodium dihydrogen phosphate by utilizing phosphoric acid by wet process
  • Method for preparing sodium dihydrogen phosphate by utilizing phosphoric acid by wet process
  • Method for preparing sodium dihydrogen phosphate by utilizing phosphoric acid by wet process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Impurity removal of wet-process phosphoric acid:

[0047] 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;

[0048] (2) Synthesis reaction of intermediates:

[0049] 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 1.0:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 80min;

[0050] (3) Cooling and crystallization to obtain the intermediate:

[0051] 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 c...

Embodiment 2

[0055] (1) Impurity removal of wet-process phosphoric acid:

[0056] 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;

[0057] (2) Synthesis reaction of intermediates:

[0058] 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 1.05:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 100min;

[0059] (3) Cooling and crystallization to obtain the intermediate:

[0060] 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

[0064] (1) Impurity removal of wet-process phosphoric acid:

[0065] 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;

[0066] (2) Synthesis reaction of intermediates:

[0067] 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 0.95:1 to determine, stirring to dissolve and heat preservation reaction, the reaction time is 60min;

[0068] (3) Cooling and crystallization to obtain the intermediate:

[0069] After the synthesis reaction is finished, put the obtained intermediate slurry into a cooling crystallization tank to cool to a temperature of 10°C, centrifug...

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Abstract

The invention discloses a method for preparing sodium dihydrogen phosphate by utilizing phosphoric acid by wet process. The method comprises the steps of carrying out reaction on carbamide and the phosphoric acid by the wet process to obtain intermediate, and then carrying out a reaction on the intermediate and sodium hydroxide to obtain the sodium dihydrogen phosphate product. The method is short in process route, low in energy consumption, stable in product quality, low in production cost, convenient to operate and safe in production; the by-product slurry can be completely recycled; the whole production process is environment-friendly, clean and free from pollution as well as emission of waste gas, waste water and waste residue; therefore, the method responses to the policy of energy conservation and emission reduction as well as clean production, and solves the problems of complicated technology, unstable product quality, high energy consumption, environmental pollution and the like in the prior art; the obtained sodium dihydrogen phosphate product has the purity of more than or equal to 98%.

Description

technical field [0001] The invention relates to a method for preparing sodium dihydrogen phosphate with wet-process phosphoric acid, which belongs to the technical field of chemical industry. Background technique [0002] Sodium dihydrogen phosphate is widely used, it can be used as a raw material for manufacturing sodium hexametaphosphate and sodium pyrophosphate; it can also be used for tanning and boiler water treatment; as a quality improver and baking powder, as a buffer in the food industry and fermentation industry It can also be used as a feed additive, detergent and dyeing auxiliaries, etc.; it can also be used as a buffer in the food industry and fermentation industry, as a raw material for fermentation powder, as a sticky material and curing agent for bread and sauce , powder sour agent, used as a quality improver for evaporated milk; also used as a stabilizer and binder for dairy products such as cheese, meat and fish products, a buffer for baking powder, and mix...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30
Inventor 廖吉星朱飞武彭宝林韩朝应张意刘琼张金萍徐园
Owner GUIYANG KAILIN FERTILIZER CO LTD
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