C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/456.5
C07C 69/00 (2006.01) C07C 263/04 (2006.01) C07C 265/14 (2006.01)
Patent
CA 1225999
MULTIPLE-STEP PROCESS FOR THE PREPARATION OF HEXAMETHYLENE DIISOCYANATE-1,6 AND/OR ISOMERIC ALIPHATIC DIISOCYANATES WITH SIX CARBON ATOMS IN THE ALKYLENE RESIDUE Abstract of the Disclosure Hexamethylene diisocyanate and/or isomeric alkylene diisocyanates having 6 carbon atoms in the alkylene radical, preferably 2-methylpentamethylene 1,5-diiqocyanate and/or 2-ethyltetramethylene 1,4-diisocyanate are prepared without the use of phosgene in a multiple-step process by means of a) reacting hexamethylene 1,6-diamine and/or isomeric alkylene diamines having 6 carbon atoms in the alkylene radical with urea and alcohol in the presence of dialkyl carbonate and/or carbamic acid alkyl ester as well as, in some cases, catalysts to form hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkyl- urethanes having 6 carbon atoms in the alkylene radical, b) separation and return to reaction step (a) of alcohol, dialkyl carbonate, and/or carbamic acid alkyl ester from the reaction mixture c) evaporation of the hexamethylene 1,6-dialkylurethane and/or isomeric alkylene dialkylurethanes having 6 carbon atoms in the alkylene radical, d) cleavage of the vaporized diurethanes into hexa- methylene diisocyanate and/or isomeric alkylene diisocyanate having 6 carbon atoms in the alkylene radical and alcohol, and e) fractional condensation of the cleavage products.
452343
Hellbach Hans
Isbarn Gunther
Koehler Waldemar
Merger Franz
Towae Friedrich
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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