Glycerolipids and fatty acids are purified in a continuous flow by removal of particulates and moisture. Following this, they are esterified and transesterified in batches, after which the fatty acid alkyl esters produced are separated from the glycerin phase byproduct and are purified through a continuous flow removal of soaps, trace glycerin, salts, and free alcohol. Excess alcohol is recovered from the glycerin phase and esters, after which it is purified and reused. Waste soaps are acidulated and recovered as fatty acids, and waste glycerin is refined and separated from trapped oils, which are recovered. A plurality of individual modules, each specialized for specific tasks, and fluidly coupled by plumbing, perform these processes. The throughput capacity is expandable in small increments through addition and integration of additional modules into the system and/or adjustments to the number of shifts worked by operators.