Process for the distillation of a mixture of isomeric diisocyanatodiphenyl-methanes

2,4'-MDI which contains very little 2,2'-MDI is prepared by distilling an isomeric starting mixture of diisocyanatodiphenylmethanes which includes 2,2'-diisocyanato-diphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenyl-methane in at least one stage...

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Hauptverfasser:	WOLF ULRICH, SCHAL HANS-PETER
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY METALLURGY ORGANIC CHEMISTRY
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creator	WOLF ULRICH SCHAL HANS-PETER
description	2,4'-MDI which contains very little 2,2'-MDI is prepared by distilling an isomeric starting mixture of diisocyanatodiphenylmethanes which includes 2,2'-diisocyanato-diphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenyl-methane in at least one stage in a separating wall column. This distillation produces at least one mixture which contains 85 to 99 wt. % of 2,4'-diisocyanatodiphenylmethane, up to 15 wt. % of 4,4'-diisocyanatodiphenyl-methane and no more than 0.2 wt. % of 2,2'-diisocyanatodiphenylmethane.
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This distillation produces at least one mixture which contains 85 to 99 wt. % of 2,4'-diisocyanatodiphenylmethane, up to 15 wt. % of 4,4'-diisocyanatodiphenyl-methane and no more than 0.2 wt. % of 2,2'-diisocyanatodiphenylmethane.</description><language>eng</language><subject>ACYCLIC OR CARBOCYCLIC COMPOUNDS ; CHEMISTRY ; METALLURGY ; ORGANIC CHEMISTRY</subject><creationdate>2009</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20090421&DB=EPODOC&CC=US&NR=7521576B2$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20090421&DB=EPODOC&CC=US&NR=7521576B2$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>WOLF ULRICH</creatorcontrib><creatorcontrib>SCHAL HANS-PETER</creatorcontrib><title>Process for the distillation of a mixture of isomeric diisocyanatodiphenyl-methanes</title><description>2,4'-MDI which contains very little 2,2'-MDI is prepared by distilling an isomeric starting mixture of diisocyanatodiphenylmethanes which includes 2,2'-diisocyanato-diphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenyl-methane in at least one stage in a separating wall column. This distillation produces at least one mixture which contains 85 to 99 wt. % of 2,4'-diisocyanatodiphenylmethane, up to 15 wt. % of 4,4'-diisocyanatodiphenyl-methane and no more than 0.2 wt. % of 2,2'-diisocyanatodiphenylmethane.</description><subject>ACYCLIC OR CARBOCYCLIC COMPOUNDS</subject><subject>CHEMISTRY</subject><subject>METALLURGY</subject><subject>ORGANIC CHEMISTRY</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2009</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNqNikEKwjAQAHvxIOof9gM9WKm9K4pHoXouS7qhC0k2ZFewv7eCD_A0MzDrqr8XcaQKXgrYRDCyGoeAxpJAPCBEftur0DdYJVJht1yLuhkTmoycJ0pzqCPZhIl0W608BqXdj5sKrpfH-VZTloE0o6NENjz7rm32bXc8NYc_lg85_Tj_</recordid><startdate>20090421</startdate><enddate>20090421</enddate><creator>WOLF ULRICH</creator><creator>SCHAL HANS-PETER</creator><scope>EVB</scope></search><sort><creationdate>20090421</creationdate><title>Process for the distillation of a mixture of isomeric diisocyanatodiphenyl-methanes</title><author>WOLF ULRICH ; SCHAL HANS-PETER</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US7521576B23</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2009</creationdate><topic>ACYCLIC OR CARBOCYCLIC COMPOUNDS</topic><topic>CHEMISTRY</topic><topic>METALLURGY</topic><topic>ORGANIC CHEMISTRY</topic><toplevel>online_resources</toplevel><creatorcontrib>WOLF ULRICH</creatorcontrib><creatorcontrib>SCHAL HANS-PETER</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>WOLF ULRICH</au><au>SCHAL HANS-PETER</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Process for the distillation of a mixture of isomeric diisocyanatodiphenyl-methanes</title><date>2009-04-21</date><risdate>2009</risdate><abstract>2,4'-MDI which contains very little 2,2'-MDI is prepared by distilling an isomeric starting mixture of diisocyanatodiphenylmethanes which includes 2,2'-diisocyanato-diphenylmethane, 2,4'-diisocyanatodiphenylmethane and 4,4'-diisocyanatodiphenyl-methane in at least one stage in a separating wall column. This distillation produces at least one mixture which contains 85 to 99 wt. % of 2,4'-diisocyanatodiphenylmethane, up to 15 wt. % of 4,4'-diisocyanatodiphenyl-methane and no more than 0.2 wt. % of 2,2'-diisocyanatodiphenylmethane.</abstract><oa>free_for_read</oa></addata></record>
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title	Process for the distillation of a mixture of isomeric diisocyanatodiphenyl-methanes
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