Reference

Oxidative aftertreatment of dyed or printed textile materials with sulfur dyes

Oxidative aftertreatment of dyed or printed textile materials with sulfur dyes. Krusche, Erwin (Cassella Farbwerke Mainkur A.-G., Ger.). Ger. Offen. DE 2529368 20 Jan 1977, 7 pp. Addn. to Ger. Offen. 2,526,778. (German). (Germany). CODEN: GWXXBX. CLASS: IC: D06P001-30. APPLICATION: DE 75-2529368 2 Jul 1975. DOCUMENT TYPE: Patent CA Section: 39 (Textiles) Cotton textiles dyed with S or S vat dyes are treated with aq. acidic solns. of Fe(III) salts at 10-120.degree. to develop the dye and produce colors with the wetfastness of those obtained by developing the dye at 55-65.degree.. Thus, 10 g cotton yarn was dyed 45 min at 60.degree. in a dyebath consisting of 200 mL H2O, 0.3 g C.I. Vat Blue 43, 1.2 mL 32.5% NaOH, and 0.8 g Na dithionite. The yarn was rinsed and treated 5 min at 95.degree. in a bath contg. 200 mL H2O, 0.2 g tartaric acid, and 0.3 g ferric nitrate [10421-48-4]. The yarn was rinsed and dried to give a dyeing with good fastness properties.

Preparation of ferric oxide

Preparation of ferric oxide. Voigt, Bernd; Goebler, Annett; Feltz, Adelbert (Friedrich-Schiller-Universitaet, Ger.Several substances are used for example 10421-48-4 and 1309-37-1 which are their cas registry numbers. Dem. Rep.). Ger. (East) DD 239397 A1 24 Sep 1986, 3 pp. (German Democratic Republic) CODEN: GEXXA8. CLASS: ICM: C01G049-06. APPLICATION: DD 85-278620 16 Jul 1985. DOCUMENT TYPE: Patent CA Section: 49 (Industrial Inorganic Chemicals) Section cross-reference(s): 55, 77 High-purity Fe2O3 in the form of hematite is pptd. from tech-purity aq. Fe3+ salt solns. at >100° (preferably at 200°). The Fe3+ salts are FeCl3 and Fe(NO3)3. In the case of FeCl3, pptn. is done 36 h at 200° until the ppt. contains no Cl-. Optionally, the Fe3+ salts are prepd. from steelmaking waste. The resulting Fe2O3 is suitable for prepn. of catalysts ferrites, and magnetic recording materials. Thus, 175 mL soln. contg. 40 g Fe(NO3)3.9H2O/L was sealed in an glass ampule 240 mm long and 40 mm inner diam. The ampule (filling degree 70%) was placed in an autoclave filled partially with water and heated 6 h at 200°. After cooling, the ampule was opened, and the pptd. Fe2O3 was sepd. by filtration, washed, and dried. The product contained Si 70, Mg 0.3, and Ca 25 ppm. Fe2O3 prepd. by using the conventional method contained Si 400, Mg 50, Mn 300, and Cr 70 ppm. .