advanced distillation technology - a basic for process simulation

Advanced Distillation Technology: A Basic for Process Simulation

Process Systems Design and Control Laboratory (PSDC Lab.)

School of Chemical Engineering, Yeungnam University

Choi Bonggu & Riezqa Andika

Advanced Distillation Technology (Single Column)

2

Heat Integration Assisted Distillation Technology Heat Pump Assisted Distillation Technology

Choi Bonggu & Riezqa Andika 3

Single columns side stream arrangements can be attractive for several processes

middle product is in excess and the other product is minor

B>50% of feed; C>AB

B>50% of feed; A>BC

Single Column Side Stream Arrangements

B(Vapor Side stream)

C

A

B(Liquid Side stream)

C

A

ABC

ABC


Latest Advanced Distillation Technology

Technology


MVR is a state of the art industrial system for binary distillation and being widely applied in separation of close boiling point components. In MVR, top vapor is used as heat transfer medium. Top stream directly go to the compressor and after that go to heat exchanger to heat up the boil up stream.

Source: A. A. Kiss, S. J. F. Landaeta, C. A. I. Ferreira Towards energy efficient distillation technologies Making the right choice A. A. Kiss Advanced Distillation Technologies: Design, Control and Applications

5

Mechanical Vapor Recompression (MVR)

Mechanical driven heat pump Heat driven heat transformer Heat driven heat pump


In an HIDiC, heat transfer occurs in the rectifying and stripping sections. The operation of both sections is similar to adiabatic column which allows heat to enter or leave any particular stage along the column section.

6

Heat-Integrated Distillation Column (HIDiC)

Source: B. Suphanit Optimal heat distribution in the internally heat-integrated distillation column


Source: B. Suphanit Optimal heat distribution in the internally heat-integrated distillation column A. A. Kiss, S. J. F. Landaeta, C. A. I. Ferreira Towards energy efficient distillation technologies Making the right choice

Heat transfer from rectification section to stripping by elevating rectifying section temperature through compression of vapor from stripping section.

7

HIDiC Principle


Thermally Coupled Distillation (TCD)

Source: N. V. D. Long, M. Lee - Improvement of natural gas liquid recovery energy efficiency through thermally coupled distillation arrangements

8

ABC

A

B

C

A B C

B

C

ABC B

C

A

Why? prefractionator arrangement avoids remixing


Requires 30% less energy

ABC B

C

A

ABC

A

B

C

A

B

C

B C

ABC B

C

A

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TCD Development

ABC

A

B

C

C

A

B

Petlyuk Column Prefractionator Arrangement

Less capital cost & total annual cost

A B

Source: N. V. D. Long, M. Lee - Improvement of natural gas liquid recovery energy efficiency through thermally coupled distillation arrangements


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Dividing Wall Column (DWC)

Petlyuk

No remixing

Reducing feed mismatch

Thermal efficiency benefit

Difficulties in operation

Dividing Wall Column (DWC)

No remixing

Reducing feed mismatch

Thermal efficiency benefit

One column with balanced pressure

Reduced Energy

Capital Saving

Improved Yield/Quality

Smaller Plot Area

Stable Operation

ABC

A

ABC B

C

A

B

C

Vs.


DWC Development

11

B>30% of feed; C30% of feed; C>A in feed

Side Stripper

Side Rectifier

Petlyuk Column

Top Dividing Wall Column

Direct Sequence

Indirect Sequence

Center Dividing Wall Column

Bottom Dividing Wall Column


Structural Design of DWC

The structure of each column is determined by using the well known Fenske-Underwood-Gilliland method.

0.5688

0.75 11 1

m mN N R R

N R

,F m

F

m

NN N

N

, ,

, ,

,

ln

ln

D LK F LK

D HK F HK

F m

LK HK

x x

x xN

where &

Structural similarity between sloppy configuration and DWC

12

large B in feed , ABBC


Industrial and Pilot Scale DWC

Source: N. Aspiron, G. Kaibel Dividing wall columns: Fundamentals and recent advances(Montz) PSDC Lab., Yeungnam University

13


DWC Internal Column

Source: N. Aspiron, G. Kaibel Dividing wall columns: Fundamentals and recent advances (Montz)

14

Process Simulation Application


Conventional MVR

Reboiler Duty (MW)

49.18 4.950

Propylene-Propane Separation - MVR

, >90% energy savings

T: 7.09


BTX Separation - DWC

17

, 20-30% energy savings

Direct seq. Indirect seq. DWC

Reboiler Duty (kW)

1983.4 2279.2 1589


, 30% energy savings

Conventional MVR

Reboiler Duty (kW) 9652 6774

Butane Separation (Debutanizer) - DWC

Thank You

Riezqa Andika

PSDC Lab., School of Chemical Engineering Yeungnam University Dae-dong 214-1, Gyeongsan 712-749 Republic of Korea (South Korea) Website : psdc.yu.ac.kr/www.yu.ac.kr

advanced distillation technology - a basic for process simulation

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