1. A hollow fiber membrane dehumidification device that is characterized by the fact that it is equipped with (a) a housing chamber that has been opened to the atmosphere through a through hole; (b) hollow fiber membranes that have been provided in said housing chamber, and that cause the compressed air that is supplied from one end to the inside to flow through, and at the same time discharge said compressed air from the other end as dehumidified air by discharging the moisture in said compressed air to the outside housing chamber; (c) a reflux route that causes a portion of the dehumidified air that has been dehumidified by said hollow fiber membrane to flow back to said housing chamber as purged air; (d) a first orifice provided on said reflux route; and (e) a second orifice that is provided on said reflux route and that possesses an opening diameter that is larger than that of the first orifice.
2. The hollow fiber membrane dehumidification device recorded in claim 1 that is characterized by the fact that said second orifice ensures that the pressure of the compressed air that is emitted to the rear stage of said dehumidification device is within the specified range when the compressed air supplied to one end of said hollow fiber membranes has flowed directly into said housing chamber without flowing back through said reflux route.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. A method for recovering a polymer comprising heating a polymer solution obtained by a solution polymerization indirectly in a pipe to evaporate a solvent while forming a gas-liquid mixed phase flow or a gas-liquid-solid mixed phase flow followed by supplying said gas-liquid mixed phase flow or said gas-liquid-solid mixed phase flow into a recovery tank to recover said polymer.
2. A method for recovering a polymer according to claim 1, wherein water or steam is infused into said polymer solution in said pipe.
3. A method for recovering a polymer according to claim 2, wherein the amount of said water infused is 0.001 to 20 parts by mass based on 100 parts by mass as said solvent in said polymer solution.
4. A method for recovering a polymer according to claim 3, wherein the number-average molecular weight of said polymer in said polymer solution is 5,000 to 1,000,000.
5. A method for recovering a polymer according to claim 4, wherein the viscosity of said polymer solution is 0.001 to 300 Pas.
6. A method for recovering a polymer according to claim 5, wherein the concentration of said polymer in said polymer solution is 0.1 to 80% by mass.
7. A method for recovering a polymer according to claim 6, wherein said polymer is at least one selected from the group consisting of butadiene rubber, styrene-butadiene rubber, isoprene rubber, ethylene-propyrene rubber, butyl rubber, styrene-butadiene copolymer, styrene-isoprene copolymer, butadiene block polymer, butadiene resin and acryl resin.
8. A method for recovering a polymer according to claim 7, wherein the linear velocity of a gas at the outlet of said pipe is 10 ms or more.
9. A method for recovering a polymer according to claim 8, wherein the devolatilizing efficiency is 0.6 or less.
10. A method for recovering a polymer according to claim 2, wherein the amount of said steam infused is 0.001 to 30 parts by mass based on 100 parts by mass as said solvent in said polymer solution.
11. A method for recovering a polymer according to claim 10, wherein the number-average molecular weight of said polymer in said polymer solution is 5,000 to 1,000,000.
12. A method for recovering a polymer according to claim 11, wherein the viscosity of said polymer solution is 0.001 to 300 Pas.
13. A method for recovering a polymer according to claim 12, wherein the concentration of said polymer in said polymer solution is 0.1 to 80% by mass.
14. A method for recovering a polymer according to claim 13, wherein said polymer is at least one selected from the group consisting of butadiene rubber, styrene-butadiene rubber, isoprene rubber, ethylene-propyrene rubber, butyl rubber, styrene-butadiene copolymer, styrene-isoprene copolymer, butadiene block polymer, butadiene resin and acryl resin.
15. A method for recovering a polymer according to claim 14, wherein the linear velocity of a gas at the outlet of said pipe is 10 ms or more.
16. A method for recovering a polymer according to claim 15, wherein the devolatilizing efficiency is 0.6 or less.
17. A method for recovering a polymer according to claim 1, wherein further removing a residual solvent by supplying said polymer in said recovery tank to a devolatilizing extruder and molding of the desolvated polymer.
18. A method for recovering a polymer according to claim 17, wherein water or steam is infused into said polymer solution in said pipe.