Boron phosphate preparation method

A technology of boron phosphate and phosphoric acid, which is applied in chemical instruments and methods, boron compounds, inorganic chemistry, etc., can solve the problems of complex production control, long process flow, and long reaction time, and achieve simple process flow, short reaction time, and high production efficiency. low cost effect

Inactive Publication Date: 2006-04-26
YUNNAN CHEM RES INST
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Problems solved by technology

[0005] The above two methods are two-step process of liquid phase reaction and calcination to prepare boron phosphate, which includes liquid phase precipitation reaction, separation, drying, high temperature calcination and cooling process of phosphoric acid and boric acid. The process flow is long and the production control is relatively complicated. An

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Embodiment 1

[0020] With boric acid as the boron source, ammonium dihydrogen phosphate and phosphoric acid as the phosphorus source, the ingredients are composed of B 2 o 3 :P 2 o 5 =1.1:1 (molar ratio). Add 164Kg of industrial boric acid and 262Kg of industrial ammonium dihydrogen phosphate into the mixer, spray the material with 13.5Kg of industrial phosphoric acid for mixing; send the mixed material into the granulator for extrusion granulation; then send it into the rotary kiln, Calcined at 500°C for 3 hours, then cooled and pulverized the material to obtain the boron phosphate product. Product obtained: B 2 o 3 =32.83%, P 2 o 5 = 63.83%.

Embodiment 2

[0022] With boric acid as the boron source, ammonium dihydrogen phosphate and phosphoric acid as the phosphorus source, the ingredients are composed of B 2 o 3 :P 2 o 5 =1.05:1 (molar ratio). Add 156Kg of industrial boric acid and 262Kg of industrial ammonium dihydrogen phosphate into the mixer, spray the material with 13.5Kg of industrial phosphoric acid for mixing; send the mixed material into the granulator for extrusion granulation; then send it into the rotary kiln, Calcined at 1000°C for 1 hour, then cooled and pulverized the material to obtain the boron phosphate product. Product obtained: B 2 o 3 =32.54%, P 2 o 5 = 65.32%.

Embodiment 3

[0024] With boric acid as the boron source, ammonium dihydrogen phosphate and phosphoric acid as the phosphorus source, the ingredients are composed of B 2 o 3 :P 2 o 5 = 1:1 (molar ratio). Add 149Kg of industrial boric acid and 262Kg of industrial ammonium dihydrogen phosphate into the mixer, spray the material with 13.5Kg of industrial phosphoric acid for mixing; send the mixed material into the granulator for extrusion granulation; then send it into the rotary kiln, Calcined at 800°C for 2 hours, then cooled and pulverized the material to obtain the boron phosphate product. Product obtained: B 2 o 3 =32.13%, P 2 o 5 = 64.59%.

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Abstract

The present invention discloses preparation process of boron phosphate. The material includes boric acid as boron source and mixture of ammonium phosphate and phosphoric acid as phosphorus source and has molar ratio between B2O3 and P2O5 of 0.9-1.1. The homogeneously mixed material is pelletized in a pelletizer and calcined at 300-1000 deg.c in a rotary kiln for 1-3 hr to synthesize boron phosphate through high temperature solid phase reaction; and the synthesized boron phosphate from the rotary kiln is further cooled and crushed to obtain the required boron phosphate product. The present invention synthesizes boron phosphate through one-step high temperature solid phase reaction, and has short reaction period, simple technological process, low production cost and high product quality.

Description

technical field [0001] The invention relates to a method for preparing phosphate, more specifically, relates to a method for preparing boron phosphate by high-temperature solid-phase reaction. Background technique [0002] Boron phosphate is a white regular tetrahedral crystal with the molecular formula BPO 4 , molecular weight 105.78, relative density 3.08g / cm 3 , Melting point ≈1450℃, soluble in caustic alkali, insoluble in water, ethanol, benzene, acetone, dilute acid and other organic solvents. Boron phosphate is widely used in catalysts for organic synthesis, glass and ceramic materials, thermally stable coatings, flame retardant materials, fuel cells and fertilizers and other fields. [0003] The magazine "Catalysis Letters" Vol.61, 61-64, 1999 reported that Moffat and his research group used boron phosphate as a solid phosphoric acid catalyst for the isomerization of 2-methyl-2-pentene. Its boron phosphate preparation process is to directly...

Claims

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Application Information

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IPC IPC(8): C01B35/08
Inventor 曾波李海昆赵海燕杨学芬
Owner YUNNAN CHEM RES INST
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