Chemistry of inorganic compounds – Sulfur or compound thereof – Oxygen containing
Patent
1990-11-01
1992-03-10
Straub, Gary P.
Chemistry of inorganic compounds
Sulfur or compound thereof
Oxygen containing
2521882, C01B 1766
Patent
active
050948334
ABSTRACT:
An improved high yield process and apparatus for producing sodium hydrosulfite by reacting sodium borohydride, sulfur dioxide, sodium hydroxide, and sodium bisulfite is provided. The improved result of the invention is obtained by a feed system that requires the introduction of a first mixture comprising sodium borohydride, sodium hydroxide, and water into a flow stream prior to the introduction of a second mixture comprising water and sulfur dioxide. The improved result can be further enhanced by techniques of intimately mixing the first mixture and the flow stream as well as intimate mixing the second mixture and the flow stream.
REFERENCES:
patent: 3985674 (1976-10-01), Ellis et al.
patent: 4534954 (1985-08-01), Little et al.
patent: 4680136 (1987-07-01), Bernhard
patent: 4788041 (1985-11-01), Sanglet
patent: 4859447 (1989-08-01), Sanglet
patent: 4988041 (1988-11-01), Sanglet
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.
John W. Gerrie "Groundwork 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).
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".
Ko Jeremy
Levis Steven H.
Morton International Inc.
Rutledge L. Dewayne
Straub Gary P.
White Gerald K.
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