Method for making a fire retardant mixture from borate and...

Details Method for making a fire retardant mixture from borate and... Method for making a fire retardant mixture from borate and...

C - Chemistry, Metallurgy

08

K

6/18.3

C08K 3/38 (2006.01) C01B 35/10 (2006.01) C09K 21/02 (2006.01)

Patent

CA 1107909

METHOD FOR MAKING CRUDE BORIC ACID FROM BORATE AND SULFURIC ACID Abstract of the Disclosure For the conversion of sodium tetraborate (e.g. "5 mole borax" or sodium tetraborate pentahydratel to solid, particulate mass of flame-retardant chemical, a slurrying amount of water (e.g. 3-5 moles per mole of tetraborate) is first added, so that a stable slurry can be formed. Then 0.95 to 0.98 mole of sulfuric acid is added to the slurry, and the tetraborate is substantially converted to a moist, particulate mixture of boric acid and sodium sulfate, the water in the slurry having been largely driven off as steam. The moist particulate mixture is suitable for imparting flame retardency to cellulosic insulation; preferably, however, it is first dried to < 20 wt.-% moisture.

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