Treatment method of biodiesel glycerol distillation high-boiling residues

The invention discloses a treatment method of biodiesel glycerol distillation high-boiling residues, which comprises the following steps: statically mixing the biodiesel glycerol distillation high-boiling residues and hydrochloric acid, then entering an acidification process, layering the mixture after complete acidification reaction, and then carrying out fatty acid separation; settling and washing the fatty acid on the upper layer to obtain a fatty acid product; cooling and crystallizing a water-phase high-boiling-point substance at the lower layer, and obtaining a high-boiling-point substance mother solution and a solid sodium chloride product in a separation process; the high-boiling-point substance mother liquor enters a salting-out process, a salted-out liquid material enters a depolymerization reaction process after heat exchange, polyglycerol is decomposed into glycerol monomers under the catalytic action, and crude glycerol is subjected to decoloration treatment to obtain a glycerol product. Accordin