Method for preparing compositions which can be used in the produ

Details Method for preparing compositions which can be used in the produ Method for preparing compositions which can be used in the produ

1985-05-07

1987-07-14

Terapane, John F.

Compositions

Reductive bleachant, deoxidant, reductant, or generative

Sulfur containing reductant, bleachant, deoxidant, or...

25218821, 25218822, 423515, 423519, C01B 1766, C01D 514, C09K 300

Patent

active

046801367

ABSTRACT:
There is provided a method for producing compositions which can be used for preparing sodium dithionite, in which sulphur dioxide is brought into contact with a recirculating aqueous solution of sodium hydroxide and previously absorbed sulphur dioxide to a ratio of sulphur dioxide and the sum of sulphur dioxide and sodium oxide of 0.61-0.66, whereafter the resultant mixture is pressurized and liquid sulphur dioxide introduced therein to a ratio between sulphur dioxide and the sum of sulphur dioxide and sodium oxide of 0.75-0.81, and the water content is adjusted to a concentration of sulphur dioxide+sodium oxide of 10-13 percent by weight. The invention also relates to the use of the prepared composition for the manufacture of dithionite.

REFERENCES:
patent: 719720 (1903-02-01), Bazlen
patent: 2147162 (1939-02-01), Haglund
patent: 2991152 (1961-07-01), Goerrig et al.
patent: 3216790 (1965-11-01), Murib
patent: 3226185 (1965-12-01), Gyan et al.
patent: 3477815 (1969-11-01), Miller et al.
patent: 3542511 (1970-11-01), Shah
patent: 3826812 (1974-07-01), Cook et al.
patent: 3826818 (1974-07-01), Heitman
patent: 3897544 (1975-07-01), Maeda et al.
patent: 3917807 (1975-11-01), Yasue et al.
patent: 3933676 (1976-01-01), Wade
patent: 4100098 (1978-07-01), Magan
patent: 4148684 (1979-04-01), Farin
patent: 4283303 (1981-08-01), Ellis
patent: 4379130 (1983-04-01), Brady
Derwent Abstract No. 30198c/17 (17th week, 1980), "Bleaching Agent Mfr. -. . . ".

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