Method for regenerating an aqueous solution of MEG containing salts with purge treatment

Process for regenerating a solution of monoethylene glycol (MEG) containing water and dissolved salts, including the following steps:

• a) evaporating said solution (100) under vacuum in a first evaporation unit (1000) to produce a gaseous effluent including MEG and water (101), and a liquid residue enriched in MEG and in salts (104), and recycling a first portion (106) of said liquid residue enriched in MEG and in salts (104) into said first vacuum evaporation unit (1000);
• c) sending a second portion (105) of said liquid residue enriched in MEG and in salts (104) obtained from step a) into a solid/liquid separation zone (1003) to separate a stream containing precipitated salts including inorganic salts (111) and a liquid effluent including dissolved salts, among which are carboxylic acid salts (112);
• d) sending a portion (114) or all of said liquid effluent (112) obtained in step c) into a second evaporation unit (1004) different from the first vacuum evaporation unit (1000) to perform a separation between the MEG and at least a portion of the carboxylic acid salts and evaporating said portion (114) or all of said liquid effluent (112) obtained in step c) under vacuum to form a vapor enriched in MEG and depleted in carboxylic acid salts (115) and a residual liquid effluent enriched in carboxylic acid salts (116);
• e) recycling said vapor enriched in MEG and depleted in carboxylic acid salts (115) into step a), or mixing said vapor enriched in MEG and depleted in carboxylic acid salts (115) with the gaseous effluent including MEG and water (101) obtained from step a), and using said gaseous effluent including MEG and water (101) obtained from step a) or said mixture to produce the regenerated MEG solution.