Process for the production of toluene diisocyanate

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Oct 4, 2011
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Dec 13, 2007
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Jun 7, 2006
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Jun 7, 2006

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Abstract

The invention relates to a process for the production of toluene diisocyanate, in which the crude toluenediamine obtained from the hydrogenation is purified and then phosgenated. The purification step reduces the total amount of cyclic ketones to less than 0.1% by weight, based on 100% by weight of the toluenediamine.

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BAYER MATERIALSCIENCE LLC;COVESTRO DEUTSCHLAND AG

International Classification(s)

C07C:ACYCLIC OR CARBOCYCLIC COMPOUNDS

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Inventor Name	Address	# of filed Patents	Total Citations
Ji, Wenbin	League, US	5	4
Pennemann, Bernd	Bergisch-Gladbach, DE	29	95
Steffens, Friedhelm	Leverkusen, DE	42	232
Zechlin, Joachim	Neuss, DE	12	21

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Process for the production of toluene diisocyanate

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United States of America Patent

11448265

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PATENT NO	8030522
APP PUB NO	20070287857A1
SERIAL NO	11448265
DOCKET NO

US Family Size	Non-US Coverage
Patent Longevity	Forward Citations

DATE PUBLISHED	PUBLICATION/PATENT NO.	PUBLICATION TYPE
October 04, 2011	US,8030522,B2 US8030522B2	GRANTED PATENT AS SECOND PUBLICATION
December 13, 2007	US,20070287857,A1 US20070287857A1	FIRST PUBLISHED PATENT APPLICATION

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11448265

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