PROBLEM TO BE SOLVED: To provide a method of manufacturing N-substituted carbamate ester with a high yield, a high purity and high efficiency (in a short time) without generation of byproducts.SOLUTION: A method of manufacturing N-substituted carbamate ester from an organic amine, urea and an aromatic hydroxy compound includes a process of supplying a composition containing a carbonic acid derivative and the aromatic hydroxy compound to a bottom part of a reaction apparatus where a synthetic reaction of the N-substituted carbamate ester occurs.
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Paragraph 0093-0095
(2017/08/29)
SEPARATION METHOD
The present invention provides a separation method of separating (A) and (B), comprising: a step of separating at least either an active hydrogen-containing compound (A) or a compound (B) that reversibly reacts with (A) from a mixture containing (A) and (B) by distillation in a multistage distillation column; and a step of supplying the mixture to an inactive region formed within the multistage distillation column.
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Paragraph 0219
(2013/10/08)
PROCESS FOR THE PREPARATION OF N-SUBSTITUTED CARBAMIC ACID ESTER AND PROCESS FOR THE PREPARATION OF ISOCYANATE USING THE N-SUBSTITUTED CARBAMIC ACID ESTER
The present invention provides a method for producing N-substituted carbamic acid-O-aryl ester derived from a compound having an ureido group, the method comprising the step of carrying out esterification or esterification and transesterification from the compound having the ureido group and a hydroxy composition containing one type or a plurality of types of hydroxy compounds.
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(2011/06/10)
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