Apparatus for the production of sodium hydrosulfite

Details Apparatus for the production of sodium hydrosulfite Apparatus for the production of sodium hydrosulfite

1986-12-22

1988-11-29

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including external recycle loop

422106, 422111, 423515, B01J 800

Patent

active

047880414

ABSTRACT:
An improved high yield process and apparatus for producing sodium hydrosulfite by reacting sodium borohydride, sulfur dioxide, sodium hydroxide and sodium bisulfite is disclosed. A continuously recirculating split process stream may be used along with control of pH, temperatures, and concentration parameters to obtain sodium hydrosulfite yields in excess of 85%.

REFERENCES:
patent: 4230668 (1980-10-01), Sheely et al.
Borol "All-Liquid Sodium Hydrosulfite Generation System for Reductive Bleaching of Pulp" product lit. of Ventron Corp.
Borol product literature of Thiokol/Ventron Division.
The Bleaching of Pulp 3rd ed. 1979 Tappi press, R. P. Singh, editor, pp. 271 and 273.
C. A. Richardson et al. Tappi 53 (12) Dec. 1970, "Two-Stage Bleaching of High-Yield Pulp at Blandin".
R. G. Guess Pulp & Paper Jun. 1979 V.53(6) pp. 74-77 "Bright News: Lower-Cost Method for TMP and Groundwood Bleaching".
John W. Gerrie "Groundwood Brightening with Borol" (reprint pp. 1-4) Pulp and Paper Magazine of Canada 75 No. 7 T251-254 (Jul. 1974).
Paper Age Apr. 1977, Product literature of Thiokol Corp./Ventron Division.
F. G. Sellers "New Hydrosulfite Route Reduces Groundwood Bleach Costs", Pulp and Paper 47 (12),80 (Nov. 1973).

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