Chemical Engineering Plant Design

1. Chemical Engineering Plant Design LekWantha Lecture 03 The Nature of Process Synthesis and Analysis

2. Creative Aspects of Process Design In many particular company, we might try to generate new ideal To produce a purchased raw material To convert a waste by-product to a valuable product To create a new material To find a new way of producing an existing product To exploit a new technology

3. Creative Aspects of Process Design Success Rates Synthesis and analysis Engineering Method Level of engineering designs

4. Levels of Engineering Designs

5. A Hierarchical Approach to Conceptual Design The engineering method indicates that we should solve design problems by first developing very simple solutions and then adding successive layers of details

6. A Hierarchical Approach to Conceptual Design Example: Hydrodealkylation of Toluene (HDA process) Toluene + H2 Benzene + CH4 2Benzene Diphenyl + H2

7. Example: Hydrodealkylation of Toluene (HDA process)

8. Example: Hydrodealkylation of Toluene (HDA process) – Energy Integration

9. Example: Hydrodealkylation of Toluene (HDA process) – Distillation Train

10. Example: Hydrodealkylation of Toluene (HDA process) – Distillation Train

11. As a vapor recovery system we could use one of these: • Condensation (high pressure, or low temperature, or both) • Absorption • Adsorption • A membrane process Example: Hydrodealkylation of Toluene (HDA process) – Vapor Recovery System

12. Example: Hydrodealkylation of Toluene (HDA process) – Simplified Flowsheet

13. Example: Hydrodealkylation of Toluene (HDA process) – Recycle Structure

14. Example: Hydrodealkylation of Toluene (HDA process) – Input-Output Structure

15. Batch versus continuous • Input-output structure of the flowsheet • Recycle structure of the flowsheet • General structure of the separation system • Heat exchanger network Example: Hydrodealkylation of Toluene (HDA process) – Hierarchy of Decisions