Process for producing anhydrous alkali metal hydrosulfites

Details Process for producing anhydrous alkali metal hydrosulfites Process for producing anhydrous alkali metal hydrosulfites

1987-06-01

1989-03-07

Dixon, Jr., William R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423511, 423512A, 423515, 423516, C01B 1745

Patent

active

048104833

ABSTRACT:
A process for producing an anhydrous alkali metal hydrosulfite comprises contacting hydrate crystals of an alkali metal hydrosulfite with an alkaline aqueous solution of a dehydrating agent having a pH of at least about 7. The slurry formed is maintained at or above the transition temperature to covert the hydrate crystals to anhydrous crystals of the alkali metal hydrosulfite. The process permits the conversion of hydrate crystals to produce anhydrous crystals of alkali metal hydrosulfite without substantial dissolving or decomposition of the alkali metal hydrosulfite.

REFERENCES:
patent: 795755 (1905-07-01), Bazlen
patent: 2938771 (1960-05-01), Avedikian
patent: 3298796 (1967-01-01), Van Damme-Van Weele et al.
patent: 4590058 (1986-05-01), Cawlfield
patent: 4676961 (1987-06-01), Appl et al.

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