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===Semi-batch reactor===
{{Main|Semibatch reactor}}
A semi-batch reactor is operated with both continuous and batch inputs and outputs. A fermenter, for example, is loaded with a batch of medium and microbes which constantly produce carbon dioxide that must removed continuously. Analogously, driving a reaction of gas with a liquid is usually difficult, since the gas bubbles off. Therefore, a continuous feed of gas is injected into the batch of a liquid. One chemical reactant is charged to the vessel and a second chemical is added slowly (for instance, to prevent [[side reaction]]s).M.HUSNAIN.R
===Catalytic reactor===