METHOD FOR OBTAINING ETHYLENEGLYCOL Russian patent published in 2016 - IPC C07C29/12 C07C31/20 C07C29/88 

FIELD: chemistry.

SUBSTANCE: claimed invention relates to method for obtaining ethyleneglycol from ethylene. Method includes the following stages: i) transformation of ethylene into ethylenoxide in presence of oxygen, catalyst of epoxidation and retardant in ethylenoxide reactor; ii) absorption of ethylenoxide with absorbent water solution and the following stripping of said absorbent to obtain flow of ethylenoxide water solution; iii) transformation of flow of ethylenoxide water solution into ethylenecarbonate flow in presence of one or several catalysts and carbon dioxide in one or several reactors of carboxylation; iv) transformation of ethylenecarbonate into first ethyleneglycol flow in presence of one or several catalysts in one or several hydrolysis reactors; v) removal of water from first ethyleneglycol flow to obtain dehydrated ethyleneglycol flow and wasted water flow in one or several dehydration columns; vi) purification of dehydrated ethyleneglycol flow in one or several ethyleneglycol distillation columns to obtain flow of purified ethyleneglycol product and recirculation catalyst flow. First ethyleneglycol flow contains inorganic chloride admixtures, and method includes the following additional stages: vii) transformation of inorganic chloride admixtures into 2-chloroethanol by reaction with ethylenoxide in one or several dehydration columns and viii) removal of 2-chloroethanol in wasted water flow.

EFFECT: claimed method makes it possible to reduce or eliminate necessity in catalyst discharge.

10 cl, 2 dwg, 1 tbl, 1 ex