Compositions – Compositions containing a single chemical reactant or plural... – Organic reactant
Patent
1988-12-02
1991-05-21
Lieberman, Paul
Compositions
Compositions containing a single chemical reactant or plural...
Organic reactant
25218821, 25218822, 8107, 8110, 8111, C11D 754, D06L 300, B01D 1900
Patent
active
050173014
ABSTRACT:
Permanganate based fabric bleaching processes, such as stone-washing processes, are substantially improved by utilizing a reducing composition comprising a metabisulfite and a sulfite in the washing step. The relative amounts of metabisulfite and sulfite in the reducing composition are selected so as to substantially eliminate the odor of sulfur dioxide during the washing step at the particular temperature selected. For washing temperatures of 100.degree.-140.degree. F. the preferred weight ratio of sodium metabisulfite to sodium sulfite is 7:3, which produces a reducing composition having a pH of 6.2 (in a 5% by weight solution). Such a composition not only allows operation at elevated temperatures without an odor of SO.sub.2, it also allows a reduction in the washing time and in the amount of reducing composition used.
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patent: 4093417 (1978-06-01), Heinlein et al.
patent: 4218220 (1980-08-01), Kappler et al.
patent: 4421664 (1983-12-01), Anderson et al.
patent: 4795476 (1989-01-01), Bean et al.
Advanced Inorganic Chemistry, F. Albert Cotton, Geoffrey Wilkinson, F.R.S., Interscience Publishers, 1972, pp. 446-449.
Bean Samuel L.
Dulik Mark D.
Monopoli Peter A.
General Chemical Corporation
Lieberman Paul
McNally John F.
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