Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Treating polymer containing material or treating a solid...
Reexamination Certificate
2004-06-14
2009-06-02
Boykin, Terressa M (Department: 1796)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Treating polymer containing material or treating a solid...
C034S368000, C203S037000, C203S095000, C528S483000, C528S500000
Reexamination Certificate
active
07541427
ABSTRACT:
An objective of the present invention is to provide a desolvation method for removing a solvent efficiently from a polymer solution. In the present desolvation method where the solvent is removed from the polymer solution by steam stripping using an apparatus comprising a pipe which connects a gas phase portion of a desolvation tank at the downstream and a liquid phase portion of a desolvation tank at the upstream, and an opening-degree adjusting mean (for example, pressure adjusting valve) fixed to this pipe, pressures are controlled such that a pressure difference (ΔP=P2−P1) between pressures of each gas phase portion of desolvation tanks at the downstream and at the upstream is allowed to be larger by from 0.005 to 0.6 MPa, preferably from 0.05 to 0.3 MPa than a pressure difference when the opening-degree adjusting mean is fully opened. In addition, in another present invention, pressures are controlled such that the pressure difference between pressures of each gas phase portion of desolvation tanks at the downstream and at the upstream is allowed to be 0.036 MPa or larger, preferably 0.1 MPa or larger.
REFERENCES:
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“Petrochemical Process” compiled by the Japan Petroleum Institute, Continuous polymerization process flow of BR, Fig. 13.1, p. 334, Kodansha Publishing Co., 2001. (with partial English translation.)
Ishii Katsunori
Katayama Nobuaki
Kumai Naritsugu
Boykin Terressa M
International Center for Environmental Technology Transfer
JSR Corporation
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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