Process for manufacturing isocyanates and producing reagent grad

Details Process for manufacturing isocyanates and producing reagent grad Process for manufacturing isocyanates and producing reagent grad

1997-05-27

1998-05-26

Nguyen, Ngoc-Yen

Chemistry of inorganic compounds

Halogen or compound thereof

Hydrogen halide

423139, 423DIG1, 423DIG14, 570347, C07C26310

Patent

active

057560633

ABSTRACT:
Reagent grade hydrochloric acid having an iron content of less than 200 p.p.b. is made from an industrial organic isocyanate manufacturing process by removing hydrogen chloride from organic isocyanates produced in the reaction between phosgene and an organic amine, converting the hydrogen chloride to concentrated aqueous hydrochloric acid, and contacting the acid with a strongly basic anion exchange resin.

REFERENCES:
patent: 2695875 (1954-11-01), McGarvey
patent: 3544611 (1970-12-01), Michelet et al.
patent: 4096165 (1978-06-01), Meyers
patent: 4193932 (1980-03-01), Yamamoto et al.
patent: 4349524 (1982-09-01), Yamashita et al.
patent: 5174865 (1992-12-01), Stultz et al.
patent: 5202106 (1993-04-01), Vanlautem
EPO Search Report dated Jul. 4, 1994.
Patent Abstracts of Japan vol. 14, No. 544, 4 Dec. 1990.
Ullman's Encyclopedia of Industrial Chemistry, vol. A14, 1989 pp. 616-620 (no month).
Kraus et al, "Anion exchange Studies . . . in Hydrochloric Acid", J. Am. Chem. Soc., vol. 75, pp. 1460-1462 (Mar. 1953).
Rohm & Haas, "Iron Removal From HCl", p. 7 (no date).
Abstract, Kozlova, L.A., "Rapid Method For The Removal of Iron Ions From Hydrochloric Acid Reagents," An CA 90(26): 214589f, STN International (1978) (no month).
Reents et al, "Anion Exchange Removal of Iron from Chloride Solutions" Industrial and Engineering Chemistry, vol. 47, No. 1, Jan. 1955, pp. 75-77 .

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