Process for the production of isocyanates and for the production

Details Process for the production of isocyanates and for the production Process for the production of isocyanates and for the production

1995-03-31

1996-12-10

Barts, Samuel

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C26310

Patent

active

055832512

ABSTRACT:
Isocyanates or isocyanate mixtures which contain no appreciable amounts of color causing materials are produced by phosgenating the amine corresponding to the desired isocyanate and treating the isocyanate-containing phosgenation mixture with hydrogen in the presence of a supported catalyst. The supported catalyst is in a form such that its shortest dimension is from about 0.3 to about 3.0 mm. This catalyst has a BET surface of from about 0.5 to about 150 m.sup.2 /g. No alkali material can be present in the catalyst. These isocyanates are particularly useful for the production of light-colored foams.

REFERENCES:
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patent: 4407733 (1983-10-01), Birkenstock et al.
patent: 4465639 (1984-08-01), Hatfield, Jr.
patent: 4774357 (1988-09-01), Keggenhoff et al.
patent: 4876380 (1989-10-01), Chen et al.
patent: 5426126 (1995-06-01), Gebauer et al.
Braunauer et al J. Am. Chem. Soc., vol 60 p. 309, (1938-Month unavailable).

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