Energy-Saving Alternative Technologies for Hydrocarbons sweetening (demercaptanization)

Our company has developed new wasteless processes for heterogeneous-catalytic refinement of light hydrocarbonic raw DEMER-LUVS and DEMERUS, and also high-boiling hydrocarbonic fractions (kerosene - jet fuel and diesel fractions, stable gas condensates) from mercaptan sulfur - DEMER-KSP, carried out in soft conditions: temperature 50-70°С and pressure 0.3-l.0 MPa using polymeric catalysts KS and КSМ and new extractant DEMERUS.

Catalysts KS and КSМ are strongly fixed on the thermostable and chemostable polymeric carrier and made in the form of convenient nozzle of the special design having an advanced geometrical surface and the large free volume. As against traditionally used catalysts on coal or coal-fibrous basis (prepared by adsorbtive impregnation of porous carbonaceous carriers water-alkaline solutions phthalocyanines of cobalt), polymeric catalysts KS and КSМ have high mechanical durability and stable catalytic activity during long term of operation without additional charging with a catalytically active component or regeneration.

Process DEMER-LUVS is intended for selective refinement of light hydrocarbonic raw (the liquefied gases and light petrol fractions) from mercaptans. It is carried out by extraction of mercaptans from hydrocarbons by 10-20 % watered solution of alkali with the subsequent regeneration sated mercaptides of alkaline extractant oxidation of air by oxygen on catalysts KS or КSМ. The specified process, since 1990, is introduced in 8 Petroleum Refineries (PR): Маjeisk, Moscow, Omsk, Lisichansk, Ufa, Yaroslavl, Kstovo and JSC TAIF-NK(Nizhnekamsk) - for sweetening of butane-butylene (BBF) and propane-propelene (PPF) fractions from cat crackabilities. The degree of refinement BBF from mercaptan sulfur in Demer-Luvs process makes not less than 10 ppm wt. by mercaptan sulphur, service life of an alkaline solution in system of refinement - not less than 1 year, and the catalyst - to 10 years.

Now new updating of the given process - DEMERUS process intended for deep extraction high-boiling mercaptans from petroleum, and also from high mercaptanic light petrols and gas condensates is developed and patented. Here is used a new highly effective extractant Demerus instead of water-alkaline solution, providing 80-90 % comparatively  refinement of petrol fractions from mercaptans at the first stage against 40-50 % in known ways. It allows to carry out deep demercaptanization of petroleum fractions in one stage, having excluded the second stage of oxidizing deodorization heavy mercaptans from the traditional circuit of demercaptanization of petroleum.

Extractant “Demerus” has doubled or tripled sulfur capacity in comparison with water-alkaline solution, it is capable to be separated easily and completely from purified hydrocarbons by simple decantation and it is easy to be regenerated. It also allows to exclude from the technological circuit water washing units of demercaptanizied hydrocarbons from alkali and their subsequent dehydration; to reduce the sizes of devices, quantity and volumes of sediment capacities and sharply to lower volume of drains from installation. Designing commercial plants recepting the given absorbent now is conducted.For deodorization of high-boiling hydrocarbonic fractions (heavy gasolines, kerosene and diesel fractions, stable gas condensate and light oils) DEMER-KSP process is developed. It is carried out by direct oxidation of active corroding and badly smelling mercaptans contained in them, into inert disulphides or oxigen-bearing thiosulfonate by oxygen of air on promotor catalyst. As against known domestic and foreign analogues, DEMER-KSP process is carried out in one stage. It does not demand preliminary water-alkaline refinement of hydrocarbonic fractions from acid admixtures; the subsequent stages of water washing, salt dehydration and adsorbtive additional purifying of demercaptanized hydrocarbonic fractions with loams, therefore it is wasteless. The specified process now has successfully passed qualifying tests and is accepted to introduction on 3 largest PRs in Russia (Moscow, Ryazan and Kirishy).

Since 1985 LOCOS process for sulfur-alkaline effluent decontamination (oxidizing Na2S to thiosulphates and sulphates) on KS catalyst was maintained in Novokuybyshevsk Petroleum Chemical Plant, Moscow Refinery, Pavlodar Refinery, Mažeikiai Refinery and Omsk Refinery.

For information: patentee Akhmadullina Alfiya

Phone/fax: +7(843)269-25-28

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Post address: 420139. Kazan, Russia, m/box 426

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