To provide a method and apparatus for producing carbonyl chloride in which a supply amount of chlorine is kept equal to or less than a supply amount of carbon monoxide in terms of molar ratio so that a polyisocyanate can be prevented from being chlorinated, and to provide a method and apparatus for producing a polyisocyanate.
In a carbonyl chloride production control section 7, a supply amount of carbon monoxide gas is first set, a carbon monoxide control valve 9 is controlled so that carbon monoxide gas is continuously supplied to a reaction section 6 by the set supply amount, and a supply amount of carbon monoxide gas detected by a carbon monoxide flowmeter 10 is always monitored. On the basis of the always monitored supply amount of carbon monoxide gas, a supply amount of chlorine is always set so as to achieve a supply amount in a predetermined ratio corresponding to a certain molar ratio in which carbon monoxide becomes excess over chlorine, and a chlorine control valve 12 is controlled so that chlorine gas is supplied to the reaction section 6 by the always set supply amount.
COPYRIGHT: (C)2010,JPO&INPIT
Onuma Fumiaki
Yuuki Sasaki
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