I should be grateful if hep me anyone by figure or documented file.
Dear Hooshyar,
As you know in continuous flow reactors, materials (reactants and products) are simultaneously charged and discharged from the reactor. I think semi-continuous flow systems are like continuous flow systems but only for a discrete time period. In other word in these systems we have continuous charge and batch discharge and vice versa.
Mahdi Ghorbanian has give a nice example in the context of chemical reactors. Let me elaborate on his example. In chemical reaction engineering one often classifies reactors using the following ideal reactors .
(i) batch reactor: no inflow, no out flow of reactants or products
(ii) a semi-batch reactor: for tt1, the inflow streams to the reactor are switched off.
(iii) Continuous stirred tank reactor (CSTR) : reactant flow into the reactor products flow out of the reactor. If the input streams are steady, then in principle the reactor can be operated at steady state. Batch and semi-batch reactors are always time-dependent processes until chemical equilibrium is reached.
But these principles also apply to other processes. For example in the coating of continuous substrate to make a coated product ( e.g adhesive tape, coated writing paper), the coater is operated as a continuous process: a feed stream is sent to a coating die that deposits the liquid film onto a moving substrate, which is then past through a drier to remove the solvent and the dried coated film is rolled up.
In patch coating, the coater is operated in a discontinuous manner, at t1
Thank you dear Dr Ghorbanian and Dr Higgins for your kindly responses.
http://encyclopedia.che.engin.umich.edu/Pages/Reactors/Semi-Batch/Semi-Batch.html
CSTR has both reactant and product flowing in and out of the reactor continuously throughout the reaction time. However, a semi-batch reactor has only a partial flow out which could be continuous reactant flow in or product withdrawal. Hooshyar Hossini
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