The invention relates to a continuous modular
biodiesel preparation process, belonging to the technical field of green
renewable energy sources. The continuous modular
biodiesel preparation process is composed of a continuous microchannel reaction and
microfiltration membrane separation. Specifically, the process comprises the following steps: 1) pumping
grease and low-carbon
alcohol into a microchannel reaction module dispersed with a heterogeneous basic catalyst through a
metering pump according to a certain ratio, then allowing a formed mixture to flow into an intermediate
buffer tank, pumping the mixture into a micro-
filtration membrane separation module through a pressure regulating pump, and carrying out flash
distillation on a discharged shell-pass penetrating fluid to obtain low-carbon
alcohol, namely a
biodiesel product; and 2) extracting a
glycerol product from tube-pass
discharge according to a certain recycle ratio, and refluxing the rest of the
glycerol product to the front of the pressure regulating pump in a circulating manner. According to the process, the high-purity biodiesel product can be directly obtained, the content of
glycerol in the product is less than 0.1%, high-efficiency production of the biodiesel at a low
alcohol / oil ratio and high-efficiency low-energy-consumption separation of glycerol in the biodiesel product can be realized, and the process is high in modularization degree, low in
energy consumption and capable of realizing high-efficiency preparation of biodiesel and flexible
assembly of a refining
system.