Recovery and purification of hfc by distillation
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Recovery and Purification of HFC by Distillation. Ramin Afrasiabi Tony Calabria John O’Brien Chemical Engineering 160 November 28 th , 2000. BIG-D Chemicals. Motive for Project. Chlorine atoms from CFCs induce the decomposition of ozone (O 3 ) in the stratosphere.

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Recovery and Purification of HFC by Distillation

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Recovery and purification of hfc by distillation

Recovery and Purification of HFC by Distillation

Ramin Afrasiabi

Tony Calabria

John O’Brien

Chemical Engineering 160

November 28th, 2000

BIG-D Chemicals


Motive for project

Motive for Project

  • Chlorine atoms from CFCs induce the decomposition of ozone (O3) in the stratosphere.

  • Replacement of the ozone-destroying CFCs refrigerants with the environmentally-friendly HFC-125 refrigerant.


Project background

Project Background

Design Project Focus

HCl

Reactor Effluent, Feed to Distillation Train

Series of Distillation Columns

Feed to Upstream Reactor

Reactor

CFC-115

HFC-125


Project goals

Project Goals

  • Design Conventional and Extractive Distillation Processes to Recover HFC-125, CFC-115, and HCl.

  • Compare Economics of Two Competing Processes

  • Recommend Cost-Efficient Scheme Based on Economic Results

BIG-D Chemicals


Project timeline

Project Timeline

-Preliminary Database Creation

08/00

09/00

-Determined Mass and Energy Balance Requirements

using Aspen Tech Simulator

-Equipment Sizing

10/00

-Calculated Fixed and Variable Costs

11/00

-Profitability Analysis

11/00

-Commence Plant Construction

01/01

-Project Completion/Commissioning

12/02

-Salvage Plant

12/15


Conventional distillation for hfc recovery

Conventional Distillation for HFC Recovery

HCl Product

Raw Feed

HFC Product

BIG-D Chemicals

Feed to T-202

CFC Product


Extractive distillation for hfc recovery

Extractive Distillation For HFC Recovery

HFC Product

HCl Product

Extractant Feed

Raw Feed

CFC Product

Extractant Recycle

BIG-D Chemicals


Equipment sizing

Equipment Sizing

  • Unit Operations

    • Distillation Towers

    • Compressors

    • Pumps

    • Condensers

    • Reboilers

    • Pressure Vessels

  • Sized Using Aspen Simulation Results


Sizing heat exchangers

Sizing Heat Exchangers

  • Modeled using LMTD

  • Input (from Aspen)

    • Heat Duty

    • Hot, Cold Temperatures

    • Appropriate Materials

  • Output

    • Overall HTC (U)

    • # tubes / pass

    • HT Areas

    • Dimensions


Equipment cost analysis

Unit

Unit

Bare Module Cost ($)

Bare Module Cost ($)

T-201

T-101

243,926

282,178

T-102

T-202

1,100,561

423,869

Condenser-201

T-103

23,996

988,920

Condenser-101

Condenser-202

23,212

13,828

Liq. Accum.-201

Condenser-102

23,621

12,835

Condenser-103

Liq. Accum.-202

30,257

13,170

Reboiler-201

Liq. Accum.-101

34,177

22,314

Liq. Accum.-102

Reboiler-202

32,365

24,989

Liq. Accum.-103

Pump-201

59,824

27,897

Reboiler-101

26,928

Reboiler-102

30,463

Reboiler-103

27,234

Pump-101

50,164

Pump (make-up str.)

Negligible

Compressor-101

Negligible

Heat Exchanger-101

Negligible

Equipment Cost Analysis

• CBM = f (equipment size, operating pressure, material of construction)

Extractive

Conventional

  • • CBM includes

  • Equipment Purchase Cost

  • Materials

  • Labor


Variable cost analysis scheme i

Variable Cost Analysis (Scheme I)


Profitability analysis

Profitability Analysis

  • Purpose To Determine:

    ExtractiveConventional

    Fixed Cost + Variable Cost < Fixed Cost + Variable Cost

  • Calculated

    - Earnings (S – COS – D – taxes)

    - Annual Cash Flow

    - Net Present Value @ 15%

    • Cash Flow Discounted To Present Worth

    • Sum of Discounted Cash Flows = NPV


Bottom line

Bottom Line

  • NPV Calculated

  • Over 15 Years

2015: NPV for Scheme II is 2.5 $MM greater than Scheme I


Recommendation future plans

Recommendation / Future Plans

  • Scheme II Promises Greatest Economic Potential

  • Submit Plant Design for Contractor Bid (Dec. 2000)

  • Commence Plant Construction (Jan. 2001)

  • Commission Plant Addition (Dec. 2002)


Acknowledgments

Acknowledgments

Professor Wallman

Professor Lynn

BIG-D CHEMICALS


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