DEMERUS processDEMERUS process was developed by STC «AhmadullinS» in the 90s of XX century for solving multifaceted problems of mercaptan removal — natural gas and LPG sweetening, naphtha, kerosene, diesel fractions, gas condensates and light oils treatment. Feature of the proposed technology is the use of heterogeneous polymer-based phthalocyanine catalyst.
Mercaptan removal — sweetening of natural (DEMERUS NG process) and liquefied (DEMERUS LPG process) petroleum gases is carried by extraction with an alkaline solution of mercaptans contained in the treated feedstock followed by regeneration of alkali in the presence of heterogeneous KSM catalyst.

If carbonyl sulfide (COS) is in the feedstock, unit of regenerative diethanolamine removal of COS (technology — DEMERUS LPG + COS) precedes mercaptan removal unit. Naphtha treatment (DEMERUS NAPHTHA process) proceeds by alkaline oxidative sweetening in the presence of heterogeneous KSM catalyst.

Technology of mercaptanremoval from kerosene fraction (DEMERUS JET process), is used for producing jet fuel of the highest quality and for white spirit deodorization. It is based on alkaline oxidative sweetening. Gas condensates sweetening (DEMERUS GASCOND process), applies solely to prepare them for transportation, and is based on extractive alkaline mercaptan removal with separation of disulfide oil.