PDD_23_IIBC - Process Design Decisions (PDD) Process Design...

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Process Design Decisions (PDD) Prof B V Babu Process Design Decisions Copyright © 2008-2009 B V Babu, BITS-Pilani LECTURE - 23
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Process Design Decisions (PDD) Prof B V Babu Recap Multiple Operations in Single Vessel – Continuous Processes – Batch Processes – Comparison of Batch vs Continuous esign of Batch s ontinuous Processes Copyright © 2008-2009 B V Babu, BITS-Pilani Design of Batch vs Continuous Processes – Level-1 decisions • Continuous Processes • Batch Processes Systematic Procedure for the design of Batch Processes Numerical Problems on Selectivity vs Conversion Summary
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Process Design Decisions (PDD) Prof B V Babu Recap Input information – Reaction information – Maximum yield – Selectivity x: HDA Process Copyright © 2008-2009 B V Babu, BITS-Pilani • Ex: HDA Process – Optimal conversion Level-1 Decisions: Batch vs Continuous – Production rates – Market forces – Operational problems Summary
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Process Design Decisions (PDD) Prof B V Babu Recap Batch processes are preferred for – Low production rates – Multiple products production – Seasonal products – Short product life – Very long reaction times Copyright © 2008-2009 B V Babu, BITS-Pilani – Handling slurries at low flow rates – Rapidly fouling materials
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Process Design Decisions (PDD) Prof B V Babu Multiple Operations in a Single Vessel Another unique feature of a batch process is that – It is often possible to accomplish several operations in a single batch vessel – Whereas an individual vessel would be needed for each of the operation in a continuous process For example, let the sequence of operations in a Copyright © 2008-2009 B V Babu, BITS-Pilani continuous plant are: – Heating a reactant – Sending the heated reactant to a reactor • Where a catalyst is added – Sending the product mixture to a distillation column Schematic diagram is shown in Fig. (next slide)
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Process Design Decisions (PDD) Prof B V Babu Multiple Operations in a Single Vessel Continuous Process eed Catalyst roduct Copyright © 2008-2009 B V Babu, BITS-Pilani Heat Reactor Separator Feed Product Heat
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Process Design Decisions (PDD) Prof B V Babu Multiple Operations in a Single Vessel In a batch process: – We might be able to use the reboiler of a batch still • For heating and reaction steps as well as for the separation – Thus, a single piece of equipment can be used to replace three pieces of equipment Product Copyright © 2008-2009 B V Babu, BITS-Pilani Heat Reactor Separator Feed Catalyst Heat Still
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This note was uploaded on 02/29/2012 for the course CHEMICAL 332 taught by Professor Profb.v.babu during the Spring '09 term at Birla Institute of Technology & Science.

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PDD_23_IIBC - Process Design Decisions (PDD) Process Design...

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