METHOD FOR SEPARATING SULFONES FROM HIGH BOILING FRACTIONS CONTAINING SULFONES

摘要

PURPOSE: A method for separating sulfones from high boiling fractions containing sulfones is provided to reduce equipment cost and process operation cost compared to hydrosulfurization method. CONSTITUTION: An extraction solvent is supplied to a high boiling fraction containing sulfones to remove unreacted oxidant and oxidation reaction by-product (S1). The extraction solvent is removed by distillation (S2). Sulfones in the high boiling fraction containing sulfones is absorbed and separated by using absorbent (S3). The absorbent is silica which is acidified. The extraction solvent is methanol or acetonitrile. The high boiling fraction containing sulfones and the extraction solvent are used with weight ration of 1:1-4:1.The high boiling fraction is Residue Hydro-DeSulfurization (RHDS) diesel whose boiling point is 180-400°C. [Reference numerals] (AA) Sulfur diesel containing sulfur oxides 180-400°C; (BB) Extraction (S1 step); (CC) Extraction solvent removal (S2 step); (DD) Adsorption (S3 step); (EE) Ultra low sulfur diesel having a high boiling fraction