Microsoft PowerPoint - Intoduction to Unit Operations 2 [

Microsoft PowerPoint - Intoduction to Unit Operations 2 [ -...

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Unformatted text preview: INTRODUCTION TO INTRODUCTION TO UNIT UNIT OPERATIONS OPERATIONS 2 2 prepared by: S.M. rafigh 2011 The overall process is broken down into individual subsets: hemical Physical Chemical Thermal Catalytic Distillation Solvent extraction Propane deasphalting Solvent dewaxing Blending Visbreaking Delayed coking Flexicoking Hydrotreating Catalytic reforming Catalytic cracking Hydrocracking Catalytic dewaxing Alkylation With their own flow arrangement: Distillation Fluid Catalytic Cracking We notice….. • The number of individual processes is large, each one can be broken down into a series of steps that appear in process after process • The individual “steps” have common techniques and are based upon the same scientific principles Fluid Dynamics Heat Transfer Evaporation Humidification Mixing Classification Fluidization Filtration Gas absorption Solvent Extraction Adsorption Distillation Drying Screening Crystallization Centrifugation Comminution Materials handling • Fluid dynamics: – a study of the behaviour of fluids – In Chemical processes fluid streams flow from one rocess to another through ipes d ucts process to another through pipes and ducts . – Process fluids are moved by pumps and compressors – Fluid flowrates must be monitored by meters and are controlled by valves . • Heat Transfer: – process fluids may need to be heated up to a certain temperature – heat from a process stream may be recovered – This can be done by contacting two streams in a heat exchanger. • Evaporation: – A special case of heat transfer, where a phase change...
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Microsoft PowerPoint - Intoduction to Unit Operations 2 [ -...

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