SOLVENT SEPARATION APPARATUS AND WASTE HEAT UTILIZATION METHOD

• US 20180319948A1
• Filed: 06/12/2017
• Published: 11/08/2018
• Est. Priority Date: 06/16/2016
• Status: Active Grant

• Current Assignee: LG Chem Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: Lee, Sung Kyu, Lee, Ha Na, Shin, Joon Ho
• Granted Patent: US 10,689,499 B2
• Time in Patent Office: Days
• CPC Class Codes: B01D 3/007 Energy recuperation; Heat pumps
• CPC Class Codes: B01D 3/14 Fractional distillation or use of a fractionation or rectification column
• CPC Class Codes: B01D 3/38 Steam distillation
• CPC Class Codes: B01D 5/006 with evaporation or distillation
• CPC Class Codes: C08F 236/06 Butadiene
• CPC Class Codes: C08F 6/001 Removal of residual monomers by physical means
• CPC Class Codes: C08F 6/10 Removal of volatile materials, e.g. solvents C08F6/001, C08F6/003, C08F6/005, C08F6/006, C08F6/008, C08F6/02, C08F6/04 take precedence
• CPC Class Codes: C08F 6/12 Separation of polymers from solutions
• CPC Class Codes: C08J 11/02 of solvents, plasticisers or unreacted monomers
• CPC Class Codes: F28D 7/00 Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall

Abstract

The present invention relates to a solvent separation apparatus and a waste heat utilization method, and the solvent separation apparatus and the waste heat utilization method according to the present application can reduce the used amount of cooling water and the used amount of steam, in a process of separating a polymer and a solvent.

Claims

1. A solvent separation apparatus comprising a stripping unit for separating a polymer from a mixture comprising a polymer and a solvent;

a water tank;

a cooling unit and a piping system,

wherein said piping system comprises a first pipe line formed so that said mixture comprising the polymer and the solvent and water from said water tank can be mixed and then introduced into said stripping unit, and a second pipe line formed so that the mixed liquid of the water and the solvent discharged from said stripping unit can be transferred to said cooling unit, and

said piping system further comprises a heat exchange part formed so that before the water discharged from said water tank is mixed with said mixture, it can be heat-exchanged with the mixed liquid before being introduced into said cooling unit.

2. The solvent separation apparatus according to claim 1,

wherein said first pipe line further comprises a steam supply pipe.

3. The solvent separation device according to claim 1, further comprising a condenser, wherein said condenser is installed at a position where before the mixed liquid discharged from said stripping unit is heat-exchanged with said water, said mixed liquid can be condensed.

4. The solvent separation apparatus according to claim 1,

wherein said polymer comprises butadiene rubber, acrylonitrile butadiene rubber, styrene butadiene rubber, solution styrene butadiene rubber or ultra high-cis poly butadiene rubber.

5. The solvent separation apparatus according to claim 1,

wherein said solvent comprises (normal) hexane.

6. A waste heat utilization method comprising steps of mixing a mixture comprising a polymer and a solvent with water discharged from a water tank and introducing the mixture into a stripping unit;

and introducing the mixture of the water and the solvent discharged from said stripping unit into a cooling unit,

wherein the method further comprises a step in which before the water discharged from said water tank is mixed with said mixture, it is heat-exchanged with a mixed liquid before being introduced into said cooling unit in a heat exchanger.

7. The waste heat utilization method according to claim 6,

wherein the water discharged from said water tank and steam are mixed and introduced into the stripping unit.

8. The waste heat utilization method according to claim 6,

further comprising a step in which the mixed liquid discharged from said stripping unit passes through a condenser condensing said mixed liquid, before being heat-exchanged with water discharged from said water tank.

9. The waste heat utilization method according to claim 8,

wherein the stream discharged from said heat exchanger and the stream discharged from said condenser are controlled to satisfy Equation 1 below:

|Tc−

Te|≤

40°

C. 

 

[Equation 1]

where, Tc represents a temperature of the fluid discharged from said condenser, and Te represents a temperature of the stream discharged from said heat exchanger.

10. The waste heat utilization method according to claim 8,

wherein the temperature of the stream discharged from said condenser is 70 to 100°

C.

11. The waste heat utilization method according to claim 8,

wherein the temperature of the stream discharged from said heat exchanger is 50 to 80°

C.

12. The waste heat utilization method according to claim 8,

further comprising a step of cooling the stream passing through said condenser and said heat exchanger to separate water.