Detail of "12269-90-8"

CAS Number:
12269-90-8
Name:
C.I. Acid Brown 235
Superlist Name:
Acid Brown 235
Molecular Weight:
0
Synonyms:
Acid BrownDGR; Dermacid Brown LDGR; Formo Brown TVD; Korostan Brown DGR; Polycor DarkBrown 2G; Triacor Brown DGR

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Treatment of wastewaters from the production of soluble azo dyes: Treatment of wastewaters from the production of soluble azo dyes. Nemec, Jaroslav; Sotona, Vladimir; Hajek, Ladislav; Macak, Jan; Zdarsa, Frantisek; Dohnal, Karel; Voprsal, Frantisek (Czech. ).In this study， 128-42-7 and 12269-90-8 are also used. Czech. CS 205783 B 1 Oct 1983,3 pp. (Czech). (Czechoslovakia). CODEN: CZXXA9. CLASS: IC: C02F001-00. APPLICATION: CS 79-4279 21 Jun 1979. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 43, 45, 60 Wastewaters contg. sol. azo dyes, direct dyes, acid dyes, Cr-complex dyes, reactive dyes, and their intermediates are condensed at the b.p. with 4-nitrotoluene-2-sulfonic acid (I) [121-03-9] or 4,4'-dinitrostilbene-2,2'-disulfonic acid [128-42-7] at pH 9.5-13.5 to give brown sol. dyes for leather and paper, and a partly purified water. Thus, 800 mL filtrate after isolation of Saturn Navy Blue LFG [61724-72-9] was boiled with 48 g I and 100 mL 10M NaOH for 4 h, acidified to pH ~3, and salted out to obtain 150-200 g greenish-brown dye for leather and paper. .