Method for making particulate sodium polyborate

Details Method for making particulate sodium polyborate Method for making particulate sodium polyborate

1997-10-02

1999-07-13

Lovering, Richard D.

Chemistry of inorganic compounds

Boron or compound thereof

Oxygen containing

106 1813, 241 16, 252607, C01B 3512, C09K 2102

Patent

active

059222964

ABSTRACT:
The disclosed method minimizes the tendency of sodium polyborate (the chemical compound obtained from boric acid and sodium sulfate) to set up into a plaster of Paris-like mass during the reaction of concentrated sulfuric acid and a hydrate of sodium tetraborate. By adding a relatively small amount of talc at an early stage in the process of making sodium polyborate, the amount of shear force needed to break up the sodium polyborate product into small particles is greatly decreased. The resulting dry, free-flowing, finely-divided product is useful as, among other things, a pesticide and a fire-retardant agent.

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Kirk-Othmer Encyclopedia of Chemical Technology, "Talc", vol. 19, pp. 608-614 (1969).

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