Ammonia borane purification method

摘要

A method of purifying ammonia borane is provided whereby crude ammonia borane is dissolved in a basic aqueous solution, the solution is heated to decompose and precipitate impurities found in the crude ammonia borane, and the impurities are separated by filtration. The aqueous solution containing dissolved ammonia borane is then cooled to a temperature of from 10° C. to −10° C., to precipitate the ammonia borane, which is recovered and dried to yield a high-purity product.

主权项

1. A method of purifying crude ammonia borane, comprising the steps of:
(a) forming an aqueous solution of crude ammonia borane in a basic aqueous solvent; (b) heating the aqueous solution to decompose and precipitate impurities present in the crude ammonia borane; (c) separating the precipitated impurities from the aqueous solution; (d) cooling the aqueous solution to decrease the solubility of the ammonia borane in the basic aqueous solvent, whereby a portion of ammonia borane is no longer dissolved in the basic aqueous solvent; and (e) separating the aqueous solution from the portion of ammonia borane that is no longer dissolved in the basic aqueous solvent.