| 摘要 |
PROBLEM TO BE SOLVED: To make the change of a static mixer unnecessary even when the quality of a polyol changes by a method wherein some part of the polyol flow is mixed with a metered carbon dioxide flow in the static mixer and then met again with the remaining polyol flow or, as a case may be, with other polyol flow and finally the ambient pressure is reduced. SOLUTION: Metered polyol flows P1, P2...Pn are sent with metering pumps 10, 11...1n from storage tanks to a common conduit 20 so as to realize a mixing ratio specified by prescription. The conduit 20 branches into conduits 21 and 22. In the conduit 22, a pressurizing pump 23 and a static mixer are present and the supplying point 25 of a metered carbon dioxide flow is present just upstream the static mixer 24. The pump 23 gives the pressure of 30-70 bar upstream the static mixer 24 so as to transfer carbon dioxide in the polyol solution without evaporation. The remaining amount of the polyol passes in the conduit 21. A pressure which is larger than the equilibrium solution pressure of CO2 dissolved in theranched flow of a conduit 26 is maintained in the conduit 26. |
