Method for preparing urea phosphoric acid with wet-process phosphoric acid

A wet-process phosphoric acid and urea phosphate technology, applied in chemical instruments and methods, preparation of urea derivatives, preparation of organic compounds, etc., can solve the problems of complex production process, high impurity content, and low product purity.

Active Publication Date: 2008-12-10
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the raw material of wet-process phosphoric acid has low phosphorus content and high impurity content, it needs to go through complicated purification process to remove various impurities in wet-process phosphoric acid. , the purity of the product is low, and usually only meet the requirements of agricultural grade

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Take the weight concentration as 48.30% (with P 2 o 5 Add 178.5kg of wet-process phosphoric acid in total) into a 200L reactor equipped with a stirring device and a heating device; start the stirring device, adjust the speed of the mixer to 150 rpm, add 200 g of reaction activator sodium lauryl sulfate and suspend Add polyethylene glycol 10000 110g, heat up to 70°C; add 76.5kg of urea with 46% N content (the molar ratio of urea to phosphoric acid is 1.05), keep the reaction temperature at 60°C and continue stirring for 1h; turn off the heating device, cool down and crystallize, and drop to Room temperature, separated and dried to obtain product 150.1kg (after testing, P 2 o 5 44.52%, N17.62%), yield 78.26%.

Embodiment 2

[0015] Take weight concentration as 49.88% 25~50% (in P 2 o 5 178.7kg of wet-process phosphoric acid in total) was added to the reaction kettle equipped with a stirring device and a heating device; the stirring device was started, and the rotating speed of the mixer was adjusted to 60 rpm / min, and the reaction activator laureth polyoxyethylene ether phosphoric acid was added Sodium 220g and suspending agent polyvinylpyrrolidone 125g, heated to 65°C; add 90.4kg of urea with 46% N content (the molar ratio of urea to phosphoric acid is 1.2), keep the reaction temperature at 65°C and continue stirring for 1.2h; turn off the heating device, cool down and crystallize , down to room temperature, separated and dried to obtain product 157.3kg (after testing, P 2 o 5 44.39%, N17.59%), yield 79.30%.

Embodiment 3

[0017] Take weight concentration as 45.01% (with P 2 o 5 176.3kg of wet-process phosphoric acid in total) was added to a 200L reactor equipped with a stirring device and a heating device; the stirring device was started, the rotating speed of the mixer was adjusted to 200 rpm / min, and the reaction activator lauryl polyoxyethylene ether was added Sodium phosphate 176g and suspending agent polyethylene glycol 10000 90g, heated to 75°C; add 83.9kg of urea with 46% N content (the molar ratio of urea to phosphoric acid is 1.25); keep the reaction temperature at 75°C and continue stirring for 1.5h; turn off the heating device , cooling and crystallization, down to room temperature, separated and dried product 133.2kg (after testing, P 2 o 5 44.27%, N17.45%), yield 75.43%.

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Abstract

The invention discloses a method for producing urea phosphate by using wet-process phosphoric acid, belonging to the chemical engineering field. The method comprises the following steps of: taking the wet-process phosphoric acid with a concentration of between 25 and 50 percent of P2O5 as measured weight, and adding the wet-process phosphoric acid in a reaction kettle which is provided with a stirring device and a heating device; starting the stirring device to heat the wet-process phosphoric acid to a temperature of between 60 and 95 DEG C; adjusting a rotational speed of a stirrer to between 60 and 300 revolutions/min, and adding a reaction activating agent and a suspending agent in the reaction kettle, with a dosage of the activating agent being 0.1 to 1.2 per thousand of phosphoric acid in a reaction system, and a dosage of the suspending agent being 0.2 to 1.0 per thousand of the phosphoric acid in the reaction system; keeping stirring for 5 to 10 minutes, and adding urea, in which a mol ratio of the urea to the phosphoric acid is between 1.0 and 1.4, in the reaction kettle, and maintaining the reaction temperature for 0.5 to 1.5 hours; closing the heating device, cooling and crystallizing to room temperature, and separating a dried product; and using a separated mother solution to produce wood fire retardant or fertilizer. The method has the characteristics of simple process, high coefficient of recovery, high product purity, low manufacturing cost, cleanness without pollution and so on.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a production method of urea phosphate. Background technique [0002] Urea phosphate is a coordination complex compound with amino structure formed by the reaction of phosphoric acid and urea. As a fine chemical product widely used in the fields of animal husbandry, industry, agriculture, etc., especially as a legal category I additive in the feed industry of the European Community (FAO), it is a special nutritional additive for ruminants recommended by the Food and Agriculture Organization of the United Nations (FAO) and Phosphorus supplements have broad market prospects. [0003] At present, domestic production of urea phosphate mostly uses thermal phosphoric acid as raw material, but due to the high price of raw acid, the production cost is relatively high, and the output is low, which cannot meet the market demand. Although my country has researched on wet-process phosphoric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C275/02C07C273/02
Inventor 解田张群田言胡宏杨丽萍王书林刘海
Owner WENGFU (GRP) CO LTD
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