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Method for continuously producing feed grade urea phosphate by using wet purified phosphoric acid

A wet purification, feed-grade technology, applied in the field of phosphorus chemical industry, can solve the problems of high content of polyurea, low purity of urea phosphate, impurity removal, etc., to achieve high product purity, good continuity and high promotion value Effect

Inactive Publication Date: 2011-05-04
中化重庆涪陵化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the many types of impurities in the raw phosphoric acid and the high content, it is impossible to remove the impurities. The purity of the urea phosphate produced is not very high, and can only reach the agricultural grade standard.

Method used

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  • Method for continuously producing feed grade urea phosphate by using wet purified phosphoric acid
  • Method for continuously producing feed grade urea phosphate by using wet purified phosphoric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Such as figure 1 As shown, start the stirring device and add 300kg / h (concentration: 31%) wet-purified phosphoric acid into a 500L jacketed reactor, heat the wet-purified phosphoric acid at 70°C, add 62kg / h urea at the same time, and react The final feed liquid overflows to a 500L vacuum concentration tank, and is controlled under a vacuum condition of 38Kpa. The temperature of the concentration tank is maintained at 80°C. The concentrated material is placed in an Oslo crystallizer to cool down to 35°C for crystallization, and the crystallization liquid is separated and dried. , the drying temperature is controlled at 110°C, and the average yield of the product is 148kg / h, and the yield is 98.7%.

Embodiment 2

[0014] Such as figure 1 As shown, start the stirring device and add 300kg / h (concentration: 31%) wet-purified phosphoric acid into a 500L jacketed reactor, heat the wet-purified phosphoric acid at 85°C, add 62kg / h urea at the same time, and react The final feed liquid overflows to a 500L vacuum concentration kettle, and is controlled under a vacuum condition of 33Kpa. The temperature of the concentration kettle is maintained at 90°C. The concentrated material is placed in an Oslo crystallizer to cool down to 35°C for crystallization, and the crystallization liquid is separated and dried. , the drying temperature was controlled at 100°C, and the measured yield of the product was 98.8%.

Embodiment 3

[0016] Such as figure 1 As shown, start the stirring device and add 300kg / h (concentration: 70%) wet-purified phosphoric acid into a 500L jacketed reactor, heat the wet-purified phosphoric acid at 70°C, add 133kg / h urea at the same time, stir The rotating speed is 65 rpm, the temperature of the jacketed reactor is kept at 70°C, and the residence time is 60min. 80°C, the concentrated material was placed in an Oslo crystallizer to cool down to 35°C for crystallization, the crystallization liquid was separated and dried, and the drying temperature was controlled at 100°C to obtain an average product of 353kg / h with a yield of 98.8%.

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Abstract

The invention discloses a method for continuously producing feed grade urea phosphate by using wet purified phosphoric acid, which is characterized by comprising the following steps of: continuously adding 5 to 7 percent wet purified phosphoric acid and urea according to a molar ratio of 1:(1.0-1.05) for mixing, reacting with stirring at the temperature of between 70 and 85 DEG C for 30 to 60 minutes, keeping the temperature of between 80 and 90 DEG C, performing vacuum concentration under the pressure of between 33 and 38Kp, concentrating materials, crystallizing and cooling to the temperature of 35 DEG C, separating and drying crystalline liquid to obtain the feed grade urea phosphate, and returning mother liquor to the vacuum concentration. In the method, the urea phosphate is continuously produced by taking the purified phosphoric acid on the basis of wet extraction purification technology as a raw material, namely the purified phosphoric acid and the urea are directly taken as raw materials, and are subjected to heating, vacuum concentration, cooling crystallization, separation and drying to obtain a feed grade urea phosphate product, and an active agent, a suspending agent and the like are not required to be added in the reaction, so that the reaction process is simple, and high in continuity, yield and product purity, ensures that the mother liquid is not generated, and has high promotional value for the subsequent product development of the purified phosphoric acid.

Description

technical field [0001] The invention belongs to the field of phosphorus chemical industry, and specifically relates to a method for continuously producing urea phosphate by using wet-purified phosphoric acid as a raw material. Background technique [0002] As a useful fine chemical product, urea phosphate is mainly used as a feed additive for cattle and sheep animals. In addition, it is also used as a silage preservative, a high-concentration nitrogen and phosphorus compound fertilizer, an ammonium polyphosphate intermediate, and an inhibitor. Combustible agent, fireproof cleaning agent, etc. Its application involves the fields of animal husbandry, industry, agriculture, etc., and has broad market prospects. [0003] At present, domestic production of urea phosphate mostly uses thermal phosphoric acid as raw material, which is produced after impurity removal. The production cost is high and the product price is relatively high. There are also a lot of research and some pate...

Claims

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Application Information

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IPC IPC(8): C07C275/02C07C273/02
Inventor 毛克万梅胜明周佩张志平陈鹏姜贵华
Owner 中化重庆涪陵化工有限公司
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