DISTILLATION SYSTEM USING MULTI STAGE STRIPPER CAPABLE OF INTEGRATED OPERATION AND STEAM CONSUMPTION REDUCTION

• US 20170036139A1
• Filed: 04/25/2014
• Published: 02/09/2017
• Est. Priority Date: 04/14/2014
• Status: Active Grant

• Current Assignee: Sunteco Limited
• Original Assignee: Sunteco Limited
• Inventors: LEE, Joo Sun
• Granted Patent: US 10,486,081 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B01D 1/28 with vapour compression
• CPC Class Codes: B01D 3/007 Energy recuperation; Heat pumps
• CPC Class Codes: B01D 3/143 by two or more of a fractionation, separation or rectification step
• CPC Class Codes: B01D 3/148 in combination with at least one evaporator
• CPC Class Codes: B01D 3/32 Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
• CPC Class Codes: B01D 3/38 Steam distillation
• CPC Class Codes: B01D 3/42 Regulation; Control
• CPC Class Codes: B01D 5/006 with evaporation or distillation
• CPC Class Codes: Y02P 70/10 Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The present invention relates to a distillation system using multi-stage stripper, the distillation system being configured to separate mixed material into high volatile components and low volatile components based on difference of boiling point, the system comprising: a stripper module including a plurality of strippers, and configured to receive the feedstock material, evaporate and discharge the high volatile component as overhead vapor and to separate the low volatile component as un-distilled; a condense-evaporator configured to condense the overhead vapor and to evaporate water; and a mechanical vapor recompression module that compresses water vapor evaporated in the condense-evaporator by multi-stages.

Claims

1. A distillation system using multi-stage stripper capable of integrated operation and reduction of steam consumption, the distillation system configured to separate mixed material existing in a feedstock material into high volatile components and low volatile components based on difference of boiling point, the system comprising:

a stripper module including a plurality of strippers, and configured to receive the feedstock material, evaporate and discharge the high volatile component as overhead vapor and configured to separate the low volatile component as un-distilled in a lower portion of the stripper, wherein gas-liquid equilibrium pressure and temperature of the high volatile component being evaporated in each of the strippers are different from each other;

a condense-evaporator configured to condense the overhead vapor that passed through the stripper module and to evaporate water supplied from a source of water supply by heat exchanging the overhead vapor with the water; and

a mechanical vapor recompression module (MVR) that compresses water vapor evaporated in the condense-evaporator by multi-stages,

wherein the water vapor compressed in the mechanical vapor recompression module is supplied to at least two strippers.

2. The system according to claim 1,

wherein a portion of the water vapor compressed in the mechanical vapor recompression module is supplied to the stripper that evaporates the high volatile component with the highest temperature.

3. The system according to claim 2,

wherein the stripper module comprises:

a first stripper configured to receive the feedstock material, evaporate the high volatile component, and discharge the evaporated high volatile component as the overhead vapor, and configured to separate the low volatile component as un-distilled in the lower portion of the stripper; and

a second stripper configured to operate at a higher temperature than the first stripper, receive material that is not evaporated in the first stripper, strip the high volatile component, discharge the stripped high volatile component as the overhead vapor, and configured to separate the low volatile component as un-distilled in the lower portion of the stripper,

wherein a portion of the water vapor compressed in the mechanical vapor recompression module is preferentially supplied to the second stripper, and the rest of the water vapor is supplied to the first stripper.

4. The system according to claim 3,

wherein the temperature and pressure of the water vapor passing the mechanical vapor recompression module is the temperature and pressure required to separate the feedstock material in the first stripper, and

the system further comprises a thermal vapor recompression (TVR) module that induces a portion of the water vapor passing through the mechanical vapor recompression module to be supplied to the second stripper, and that increases the temperature and pressure of the water vapor being supplied to the second stripper to the temperature and pressure required to separate the feedstock material in the second stripper.

5. The system according to claim 4,

wherein the overhead vapor of the second stripper is supplied to the first stripper to be used as a heat source necessary for separating the feedstock material in the first stripper.

6. The system according to claim 5,

further comprising:

a steam supplier that supplies steam to the first stripper and the second stripper;

a first valve configured to be opened or closed so as to control whether or not to supply the steam to the first stripper; and

a second valve configured to be opened or closed so as to control whether or not to supply the steam to the second stripper.

7. The system according to claim 6,

further comprising a third valve configured to be opened or closed, and to induce a portion of the steam being supplied from the steam supplier towards the thermal vapor recompression module.

8. The system according to claim 7,

wherein the mechanical vapor recompression (MVR) module comprises:

a first module that is configured as a plurality of mechanical vapor recompression apparatuses;

a second module that is configured as a plurality of mechanical vapor recompression apparatuses, and that further compresses the water vapor that passed through the first module; and

a laminator that reduces the velocity of the compressed water vapor that passed through the first module and supplies the compressed water vapor to the second module.

9. The system according to claim 8,

further comprising:

a condenser that receives the overhead vapor not condensed in the evaporator and condenses the received overhead vapor; and

a distillation column that receives solution condensed in the condenser.

10. The system according to claim 9,

further comprising a re-boiler that supplies the steam to the distillation column,

wherein steam condensate water of the re-boiler is evaporated and is supplied to the laminator.

11. The system according to claim 10,

wherein the laminator adjusts the temperature of the compressed water vapor that passed through the first module and the temperature of the vapor evaporated from the steam condensate water supplied form the re-boiler to be identical to each other.

12. The system according to claim 7,

wherein a flow rate controller is installed on an inlet end of the first module.