There's a misunderstanding from the query. Batch procedure applies normally to combine and settle kind processing, with optional or dispersed driver, Fixed Bed Process imply that the substrate as well as the reagent has been passed within a bed of catalyst or with a diluent. Both can be implemented to appear to be comparable, but fixed bed (heterogeneous catalyst operated systems) generally have higher levels of scale into market.
Usage of homogeneous catalysts for Bio diesel production is, generally speaking, applied to your Batch procedure. In the event of heterogeneous catalysis, many factor include under consideration ( rather than only mass transfer problems ) to ensure the good catalyst may be used in a bunch bed reactor. But, solid catalyst may be utilized also for your own batch or semi-batch procedure.