Boron phosphate preparation method

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...

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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. And the reaction time is long, the energy consumption is high

And so far, with boric acid as boron source, with the mixture of diammonium hydrogen phosphate or ammonium dihydrogen phosphate and phosphoric acid as phosphorus source, the method that adopts high-temperature solid-phase reaction to synthesize boron phosphate in one step has not yet been reported.

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