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a - BATCH REAC TOR 1 im st actor ope close ve l n d sse S...

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1 BATCH REACTOR
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2 Simplest reactor – open / closed vessel Reactants areplaced insidethereactor and allowed to react over time Products and unconverted reactants areremoved and the process is repeated Closed system - unsteady stateoperation Fitted with a stirrer May havea jacket / cooling or heating coils inside the reactor Generally constant volume/ some designed at constant pressure Materials of construction – different linings
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Batch Reactor Contd. . . 5
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Batch Reactor Animation 6
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Batch Reactor Cont. . . 7 Used in variety of applications Typically for liquid phasereactions that requirelong reaction times Used only when small amount of product is required Favored when a process is in developmental stageor to produceexpensiveproducts Used to makea variety of products at different times
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8 (1) Each batch is a closed system. (2) Thetotal mass of each batch is fixed. (3) Thereaction (residence) timet for all elements of fluid is the same. (4) Theoperation of thereactor is inherently unsteady-state; for example, batch composition changes with respect to time. (5) It is assumed that, at any time, thebatch is uniform(e.g., in composition, temperature, etc.), because of efficient stirring. Characteristics of a Batch Reactor
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Batch Reactor Contd ... 9 Advantages: High conversions can beobtained 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 No instrumentation – Poor product quality
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