Patent ID: 8518707

Claim:
A method of purifying a mixture of esters and of glycerin, comprising subjecting the mixture to an adsorbent bed that captures glycerin, purification of the mixture occurring on at least two adsorbent beds arranged in different reactors, one at least being in adsorption mode and one at least in regeneration mode, wherein breakthrough of the bed is continuously detected and/or monitored by measuring the amount of glycerin present in the purified stream by turbidimetry, such that when the measurement of the amount of glycerin present in the stream at the outlet of a reactor R 1 working in adsorption mode reaches a set value, said reactor is switched to the regeneration mode, and the incoming ester stream to be purified is sent to another adsorbent bed that can work in adsorption mode, measurement of the amount of glycerin present in the purified stream is achieved by turbidimetry after cooling the ester stream from a temperature higher than 20° C. to a temperature of at most about 20° C., the turbidimeter measurement is converted to an analog signal and it automatically triggers an adsorption bed switch.