Council of Scientific and Industrial Research

Virendra Kumar Kapoor

Anil Kumar

Sunil Kumar

Bir Sain

Som Nath Puri

Bhagwati Prasad Balodi

Gur Pratap Rai

Turuga Sundara Rama Prasada Rao

Gautam Das

Virendra Kumar Bhatia

The present invention relates to a process for the preparation of metal phthalocyanine sulphonamide &lsqb;MPc(SO NHR) &rsqb; catalyst useful for sweetening of LPG and light petroleum distillates which comprises reacting a metal phthalocyanine with chlorosulphonic acid at 90-150&deg; C. for 1-5 hrs. cooling the reaction mixture adding 1-7 parts of a chloride reagent heating the said mixture at 60-80&deg; C. from 0.5-3 hrs. to obtain the metal phthalocyanine sulphonyl chloride, isolating it by adding the reaction mixture in ice cold water, reacting the isolated metal phthalocyanine sulphonyl chloride with an amine of general formula H NR where R is selected from hydrogen, aryl, alkyl and cycloalkyl in an aqueous or non-aqueous medium or a mixture thereof at a temperature in the range &minus;4 to 15&deg; C. and at a pH ranging between 7-9 in the presence of an acid binding agent to obtain the described metal phthalocyanine sulphonamide catalyst wherein the chloride reagent used is selected from the group consisting of thionyl chloride, phosphorus trichloride and phosphorus pentachloride, the binding agent used is selected from the group consisting of sodium bicarbonate, sodium carbonate, sodium hydroxide and tertiary organic bases selected from pyridine triethyl amine and piperidine and the catalyst metal phthalocyanine sulphonamide is selected from the group consisting of cobalt, manganese, nickel, iron vanadium phthalocyanine sulfonamide most preferably cobalt phthalocyanine sulphonamide.

Process for the preparation of a catalyst useful for liquid-liquid sweetening LPG and light petroleum distillates

The present invention related to a process for sweetening of LPG light petroleum distillates by liquid liquid extraction using metal phtalocyanine sulphonamide catalyst which comprises extracting the mercaptanes contain in LPG, light petroleum distillate like pentanes, light straight run naphtha by liquid-liquid extraction using an aqueous or alcoholic solution of alkali metal hydroxide of concentration ranging between 1 wt % to 50 wt % in the presence of a metal phthalocyanine sulphonamide catalyst in the concentration ranging from 5-4000 ppmw, at a temperature ranging from 10&deg; C. to 80&deg; C. at a pressure ranging from 1 kg/cm -50 kg/cm in a continuous or batch manner, converting the mercaptanes present in above said extract into corresponding disulphides by passing air, oxygen or any oxygen containing gas at the above same temperature and pressure, regenerating the alkali solution containing catalyst for recycling by separating the upper layer of disulphides from said alkali solution of catalyst.

Process for sweetening of LPG, light petroleum distillates by liquid-liquid extraction using metal phthalocyanine sulphonamide catalyst

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Dehradun, India

Virendra Kumar Kapoor