The present invention is subjected to a waste vegetable oil transesterification process of waste cooking oil to produce glycerin and esters an apparatus , and a mixture of used cooking oil with an ester exchange agent in-line mixer 20 , the transesterification reaction mixture , is introduced alternately to the pair of glycerin separation vessel (27a, 27b), and separated into glycerol ester , and the separated glycerin was burned in a boiler 70 , the heat generated in the boiler 70, the heat of the used cooking oil or ester exchange reaction , and will be used for water removal in a regeneration consisting of ester oil .
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