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US 4,788,041 AGranted
Apparatus for the production of sodium hydrosulfite
AssigneeMorton Thiokol, Inc.
InventorPhilippe R. Sanglet
Life of this patent
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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%.
Claims9
Apparatus for the production of sodium hydrosulfite, comprising:
- a. input means connected to a first flow line for introducing sodium hydroxide solution into said first flow line, said flow line for transporting a process stream;
- b. water input means connected to said first flow line for introducing water into said first flow line;
- c. input means connected to said water input means at a location downstream from said sodium hydroxide input means for introducing sulfur dioxide into said water line input means, at which location sodium hydroxide and sulfur dioxide can react to form an aqueous solution of sodium bisulfite;
- d. first process stream recycling means connected to said first flow line at a point downstream from said water input means and also connected to said first flow line upstream from said sodium hydroxide input means and said water input means for recycling at least a portion of said sodium hydroxide, water, sulfur dioxde and sodium bisulfite;
- e. a mixer connected to said first flow line at a location downstream of said first process stream recycling means, said mixer also connected to input means for introducing a mixture of sodium borohydride, sodium hydroxide, and water into said mixer whereby sodium bisulfite and sodium borohydride can react to form an aqueous solution of sodium hydrosulfite;
- an outlet of
- f. said mixer being connected by a second flow line to degassing means for removing hydrogen from said aqueous solution of sodium hydrosulfite;
- and
- g. a third flow line connected to said degassing means for removing sodium hydrosulfite from said degassing means, said third flow line also connected to storage means for storing said sodium hydrosulfite and a second process stream recycling means connected to said third flow line and also connected to said first process stream recycling means whereby said sodium hydrosulfite solution can be recycled.
6 more elements
Apparatus for the production of sodium hydrosulfite, comprising:
- a. first input means connected to a first flow line for introducing an aqueous mixture of sodium bisulfite and sulfur dioxide into said first flow line, said flow line for transporting a process stream;
- b. first process stream recycling means for receiving said aqueous mixture of sodium bisulfite and sulfur dioxide and having an inlet end thereof connected to said first flow line at a location downstream of said first input means and having an outlet end thereof connected to said first flow line at a location upstream of said first input means for recycling at least a portion of said aqueous mixture of sodium bisulfite and sulfur dioxide;
- c. a mixer connected to said first flow line at a location downstream of said first process stream recycling means, said mixer also connected to a second input means for introducing a mixture of sodium borohydride, sodium hydroxide, and water into said mixer whereby sodium bisulfite and sodium borhydride can react to form an aqueous solution of sodium hydrosulfite;
- d. said mixer being further connected downstream by a second flow line to degassing means for removing hydrogen from said aqueous solution of sodium hydrosulfite;
- and
- e. a third flow line connected to said degassing means for removing sodium hydrosulfite from said degassing means, said third flow line also connected to stroage means for storing said sodium hydrosulfite and a second process stream recycling means connected to said third flow line and also connected to said first process stream recycling means whereby said sodium hydrosulfite solution can be recycled.
3 more elements
Dependencies are inferred from the claim text.