Synthesis of the PFD from the Generic BFD

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Chapter 10

• Synthesis of the PFD from the Generic BFD

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• It is a common human trait to resist change more
  strongly as more effort is expended on a task,
  design, or product. We describe this as not
  wanting to abandon our investment in the
  activity.

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Information Needs and Sources

• Interactions with other engineers and scientists.
• Reaction kinetics data.-main and by products,
  catalysts,patents. Without kinetics data a
  prelim PFD and cost analysis can be done.(.10kg
  product/kg catalyst per hour. Ea 40-200kJ/mol)
• Physical property data-material and energy
  balances

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Reactor Section

• Phase of the reacton
• Temperature and pressure ranges
• Controlled by kinetics or equilibrium
• Need a solid catalyst or is it homogeneous
• Exothermic or endothermic (magnitude)
• Side reactions and selectivity
• Single pass conversion.
• Reactor feed outside the explosive limits fro
  gas-phase oxidations

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General guidelines for choosing separation
operations

• Table 10.1 Guidelines for choosing separation
  units.
• Table 10.2 Guidelines for sequencing separation
  units.

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Sequencing Distillation Columns

• Figure 10.1
• Azeotropes- figure 10.4

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Feed preparation

• Heat exchangers
• Pumps
• Compressors
• Exothermic reaction feed temperatures need to be
  high in order to prevent reactor runaway due to
  buildup of unreacted material and cause a severe
  temperature spike.

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Recycle Section

• Should be at same conditions of feed when
  combined.

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Environmental Control Section

• Minimize or eliminate

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Major process control loops

• Significant design improvements can occur through
  developing major control loops.
• They provide focal points for optimizing the
  process.

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Flow Summary Table.

• See Chapter 1

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Major Equipment Summary Table

• See chapter 1.