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Low solvent efficient production of unstable reaction products

In industry, chemical reactions involving high substrate concentrations may disadvantageous lead to polymerization of the substrate and the occurrence of other unwanted side-reactions. This leads to a low yield of the desired product and a low product purity.
Therefore, certain reactions are preferably carried out at high dilution of the substrate in order to minimize the formation of unwanted side products. In particular in batch reactions, this requires the use of large amounts of solvent to keep substrate concentration sufficiently low. In other words, for the production of small quantities of an end product, often the use of large volumes of solvent and the use of large reactor volumes is required, thereby obtaining small reaction product yields per unit volume of reactor.
Through, so-called “fed-batch” processes the ratio between product yield and required reactor volume may be improved. The substrate is then gradually added to the reactor in which the product(s) remain in the reactor until the end of the run. This technology has proven its added value mainly in the production of stable reaction products.

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