ABSTRACT
Reactants are fed continuously, and the products are withdrawn continuously. Batch reactions are conducted in stirred tanks for small, daily production rates, or when the reaction times are long, or when some condition, such as feed rate or temperature, must be programmed in some way. A reaction where mixing is important is the tank flow or Comparing continuous stirred tank reactor (CSTR); it is also referred to as a back-mix reactor. This type of reactor, like the batch reactor discussed in a later section, essentially consists of a tank or kettle equipped with an agitator. The CSTR therefore requires a larger volume than a tubular reactor to accomplish a given degree of conversion. For any order reaction other than first order, the sequence in which the reactors are placed may affect the performance. Selectivity is a measure of how predominant the desired reaction is relative to one of the undesired products produced by a side reaction.
