Chemical Sciences, Earth, Atmosphere & Environment Sciences


Sweetening catalyst for Refinery Streams


Chemical Sciences, Earth, Atmosphere & Environment Sciences

Focus Area:

LPG Sweetening


US6696381, DE10115725, DE10115893, FR2816853, FR2816854, FR2818282, FR2822837, GB2371300, GB2371556, GB2372501, GB2373790, IN220176, IN226702, IN230888, IN232143, IN232337, US6565740, US6696381, US6740619, US6755964

Social Benefits:

Drop in Catalyst - No changes in existing LPG Sweetening plant required , Higher activity, comparable stability with leading international sweetening catalysts , Lower catalyst consumption due to higher activity , Competitively priced, cost effective in use , Shelf life of 3 years

Developing Agency:

CSIR-Indian Institute of Pertroleum (IIP), Uttarakhand

Technology Readiness Index:

Technology Integrated

Website Link :
Source (more info) :

Brief Description

Description :

The presence of mercaptans in petroleum products like LPG, naphtha, gasoline, aviation turbine fuel (ATF) and kerosene is undesirable due to their foul odor and highly corrosive nature which also may affect the activity of catalysts used in downstream processes. In commercial practice, the low molecular weight mercaptans present in LPG are first extracted with alkali and subsequently oxidized catalytically to disulfides. The process for converting mercaptans into less deleterious disulfides is termed as sweetening. CSIR-Indian Institute of Petroleum has developed a homogeneous catalyst, Thoxcat ESTM, which sweetens LPG cost-effectively.

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