a - 1 BATCH REACTOR 2 • Simplest reactor – open closed...

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Unformatted text preview: 1 BATCH REACTOR 2 • Simplest reactor – open / closed vessel • Reactants are placed inside the reactor and allowed to react over time • Products and unconverted reactants are removed and the process is repeated • Closed system - unsteady state operation • Fitted with a stirrer • May have a jacket / cooling or heating coils inside the reactor • Generally constant volume / some designed at constant pressure • Materials of construction – different linings 3 4 Batch Reactor Contd. . . 5 Batch Reactor Animation 6 Batch Reactor Cont. . . 7 • Used in variety of applications • Typically for liquid phase reactions that require long reaction times • Used only when small amount of product is required • Favored when a process is in developmental stage or to produce expensive products • Used to make a variety of products at different times 8 (1) Each batch is a closed system. (2) The total mass of each batch is fixed. (3) The reaction (residence) time t for all elements of fluid is the same. (4) The operation of the reactor is inherently unsteady-state; for example, batch composition changes with respect to time. (5) It is assumed that, at any time, the batch is uniform (e.g., in composition, temperature, etc.), because of efficient stirring. Characteristics of a Batch Reactor Batch Reactor Contd ... 9 Advantages: • High conversions can be obtained • Versatile, used to make many products • Good for producing small amounts • Easy to Clean Dis-advantages: • High cost of labor per unit of production • Difficult to maintain large scale production • Long idle time (Charging & Discharging times) – leads to periods of no production GUIDELINES FOR SELECTING BATCH PROCESSES...
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This note was uploaded on 06/06/2011 for the course CHEM 3040 taught by Professor Reddy during the Spring '10 term at Taylor's.

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a - 1 BATCH REACTOR 2 • Simplest reactor – open closed...

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