Method for producing carbamate and method for producing isocyanate
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsNobuhisa Miyake, Koichi Nakaoka, Yusuke Sakurai, Midori Nagamoto, Kazuhiro Takagaki, Masaaki Shinohata
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Abstract
The present invention provides a method for producing a carbamate that includes a step (1) and a step (2) described below: (1) a step of producing a compound (A) having a urea linkage, using an organic primary amine having at least one primary amino group per molecule and at least one compound selected from among carbon dioxide and carbonic acid derivatives, at a temperature lower than the thermal dissociation temperature of the urea linkage; and (2) a step of reacting the compound (A) with a carbonate ester to produce a carbamate.
Claims11
A method for producing a carbamate comprising a step (1) and a step (2) described below:
- (1) a step of producing a compound (A) having a urea linkage, using an organic primary amine having at least one primary amino group per molecule and at least one compound selected from among carbon dioxide and carbonic acid derivatives, at a temperature lower than a thermal dissociation temperature of a urea linkage;
- and
- (2) a step of reacting the compound (A) with a carbonate ester to produce a carbamate.
Dependencies are inferred from the claim text.