Organic compounds -- part of the class 532-570 series – Organic compounds – Isocyanate esters
Patent
1993-04-02
1994-11-01
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Isocyanate esters
560345, C07C26300
Patent
active
053609310
ABSTRACT:
A continuous multistage process for the preparation of (cyclo)aliphatic diisocyanates comprising a) condensing urea with a (cyclo)aliphatic diamine in the presence of an alcohol solvent to make a (cyclo)alkylenebisurea in a distillation reactor; b) reacting the crude (cyclo)alkylenebisurea with alcohol in a pressurized distillation reactor to make (cyclo)biscarbamate; c) removing the ammonia formed in the pressurized distillation reactor; d) cleaving the (cyclo)biscarbamate in the presence of a catalyst in a combined cleavage and rectifying column to make crude (cyclo)alkylene diisocyanate; e) reacting a diverted portion of the cleavage products with the alcohol to form a recycling mixture; f) and distilling the crude (cyclo)alkylene diisocyanate formed in step d.
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Bohmholdt Gerd
Heitmann Wilhelm
Kirchner Peter
Michalczak Hans-Werner
Barts Samuel
Dees Jos,e G.
Huels Aktiengesellschaft
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