Integrated process for preparing isocyanates

Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters

Reexamination Certificate

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C560S330000, C560S336000, C560S338000, C205S436000, C205S438000, C205S455000, C205S456000, C205S551000

Reexamination Certificate

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06916953

ABSTRACT:
Process for preparing organic isocyanates, which comprises the steps(a) making available a first partial amount of chlorine, with the chlorine of this first partial amount having a content of free and bound bromine and iodine of <400 ppm;(b) making available a second partial amount of chlorine;(c) reacting the first and second partial amounts of chlorine with carbon monoxide to form phosgene;(d) reacting the phosgene from step (c) with one or more primary amines to form the corresponding isocyanates and hydrogen chloride;(e) separating off and, if necessary, purifying the isocyanates formed in step (d);(f) separating off and, if necessary, purifying the hydrogen chloride formed in step (d);(g) catalytically oxidizing at least part of the hydrogen chloride separated off in step (e) by means of oxygen to form chlorine;(h) separating off the chlorine formed in step (g) and using at least a partial amount of the chlorine which has been separated off as second partial amount of chlorine in step (b).

REFERENCES:
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patent: 3660261 (1972-05-01), Wright et al.
patent: 6010612 (2000-01-01), Freire et al.
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patent: 197 26 530 (1998-12-01), None
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patent: 2000-75319 (2000-03-01), None
patent: WO 01/00569 (2001-01-01), None
patent: WO 01/00569 (2004-01-01), None
Derwent Abstracts, DE 199 28 741, Dec. 28, 2002.
Ullman's Enc. of Lud. Chem, 5THEd., vol. A6, pp. 463-466.

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