Solvent separation method, solvent separation apparatus and solvent separation system

• US 10,258,995 B2
• Filed: 11/28/2016
• Issued: 04/16/2019
• Est. Priority Date: 02/24/2016
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Nagai, Koichi, Minamio, Masanori, Kanda, Toshiro, Takano, Yasuyuki, Kawata, Masahiro
• Primary Examiner(s): Orlando, Amber R
• Assistant Examiner(s): Turner, Sonji
• Application Number:
  US15/362,239
• Publication Number:
  US 20170239670A1
• Time in Patent Office: 869 Days
• CPC Class Codes: B01D 2257/704 Solvents not covered by groups B01D2257/702 - B01D2257/7027
• CPC Class Codes: B01D 2257/708 Volatile organic compounds V.O.C.'s
• CPC Class Codes: B01D 53/002 by condensation
• CPC Class Codes: B01D 53/323 by electrostatic effects or by high-voltage electric fields
• CPC Class Codes: B03C 3/01 Pretreatment of the gases prior to electrostatic precipitation
• CPC Class Codes: B03C 3/014 Addition of water; Heat exchange, e.g. by condensation
• CPC Class Codes: B03C 3/47 flat, e.g. plates, discs, gratings

Abstract

Provided are a solvent separation method, a solvent separation apparatus, and a solvent separation system that make it possible to easily collect a solvent removed from an exhaust atmosphere and that make it possible to easily carry out maintenance of exhaust gas pathways. An impeller placed in a storage space of a casing is rotated to introduce a gas including a volatilized solvent from an inlet of the casing into the storage space, and the volatilized solvent is cooled and devolatilized by a collection face that has been cooled so as to have a surface temperature lower than the temperature of the gas, to thereby separate the solvent from the gas.

Claims

1. A solvent separation method for removing a volatilized solvent from a gas, the method comprising:

(i) rotating an impeller in a storage space of a casing to introduce the gas including the volatilized solvent from an inlet of the casing into the storage space; and

(ii) cooling and devolatilizing the volatilized solvent that has been introduced into the storage space, by a collection face of a collection part that has been cooled so as to have a surface temperature lower than a temperature of the gas from the inlet, to thereby separate the volatilized solvent from the gas,

wherein the collection face faces a surface of the casing on which the inlet is disposed, the collection face is disposed on an inner surface of the casing and in a region where the gas released from the impeller is not directly blown,

the collection part includes a surface area-enlarging part at a side of the collection face.

2. The solvent separation method according to claim 1, further comprising, before Step (i), condensing the volatilized solvent with respect to the gas including the volatilized solvent.

3. The solvent separation method according to claim 1, further comprising, after Step (ii), applying an electric field to the gas from which the solvent has been separated, to thereby separate the volatilized solvent that remains in the gas.

4. The solvent separation method according to claim 2, further comprising, after Step (ii), applying an electric field to the gas from which the solvent has been separated, to thereby separate the volatilized solvent that remains in the gas.

5. A solvent separation apparatus, comprising:

a casing having an impeller that is provided with multiple blades arrayed around a rotating shaft and that is capable of rotating around the rotating shaft, the casing further having a storage space in which the impeller is placed, an inlet for introducing a gas including a volatilized solvent into the storage space, and an outlet for discharging the gas from the storage space; and

a collection part having a collection face that faces the storage space, wherein the collection face is cooled so as to have a surface temperature lower than the temperature of the gas that is introduced from the inlet,

wherein the impeller is rotated to introduce the gas from the inlet into the storage space, and then, the volatilized solvent is cooled and devolatilized by the collection face to thereby separate the solvent from the gas,

wherein the collection face faces a surface of the casing on which the inlet is disposed, the collection face is disposed on an inner surface of the casing and in a region where the gas released from the impeller is not directly blown,

wherein the collection part includes a surface area-enlarging part at a side of the collection face.

6. The solvent separation apparatus according to claim 5, wherein:

a region with a heat insulation material placed over a portion of the casing is referred to as a heat insulation region, and a region without heat insulation material placed over another portion of the casing is referred to as a heat release region; and

the collection face is located within the heat release region.

7. A solvent separation system, comprising:

the solvent separation apparatus according to claim 5 that is placed downstream of an exhaust gas-generating apparatus generating a gas including a volatilized solvent; and

a condensation apparatus that is placed between the exhaust gas-generating apparatus and the solvent separation apparatus, and that condenses the volatilized solvent.

8. The solvent separation system according to claim 7, further comprising a dust collection part that applies an electric field to the gas discharged from the solvent separation apparatus, downstream of the solvent separation apparatus, to separate the volatilized solvent that remains in the gas.