Experience with Hydrogen-Free Treatment to Remove Sulfur Compounds from Light Hydrocarbon Feedstock of the Novokuibyshev
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TECHNOLOGY
EXPERIENCE WITH HYDROGEN-FREE TREATMENT TO REMOVE SULFUR COMPOUNDS FROM LIGHT HYDROCARBON FEEDSTOCK OF THE NOVOKUIBYSHEVSK PETROCHEMICAL COMPANY
F. A. Korobkov, A. M. Mazgarov, R. A. Shakirzyanov, B. S. Strel’chik, A. A. Nikulin, O. V. Nazarov, and I. O. Voronin
We have developed technology for h y d ro g e n - f re e re m o v a l of sulfur compounds (H 2S + RSH + COS + CH 3–S–CH 3) from wide cut light hydrocarbon fractions (WCLHs) and t a r g e t p r o d u c t s ( C 3 , C 4 , i s o - C 5 , n - C 5) o f g a s - f r a c t i o n a t i o n p l a n t s , i n c l u d i n g b a s e - c a t a l y s i s treatment to remove hydrogen sulfide and mercaptans from WCLHs, utilizing the homogeneous catalyst IVKAZ; removal of carbonyl sulfide from propane with hot alkali and regeneration of the alkali; removal of dimethyl sulfide from isopentane by azeotropic distillation; oxidative catalytic treatment of sulfur-containing alkaline wastes using the homogeneous catalyst IVKAZ. The obvious advantages of the homogeneous catalyst IVKAZ compared with the heterogeneous phthalocyanine catalysts KS and KSM in demercaptanization of light hydrocarbon feedstock and oxidative treatment of sulfur-containing alkaline wastes has been proven in practice. Key words: mercaptans, hydrogen sulfide, sulfur-containing alkaline wastes, disulfides, demercaptanization, liquid-phase oxidation. In 1974, the first domestic Merox-type plant was put into operation at the Novokuibyshevsk Petrochemical Co. (Novokuibyshevskii NKhK), now Samara Petroleum and Organic Synthesis Closed Jt.-Stock Management Co. (ZAO Upravlyayushchaya Kompaniya SamarNefteorgSintez), for removing mercaptans from n-pentane based on the revamped block for removal of hydrogen sulfide from propane in the central gas fractionation unit TsGFU-2 using tripotassium phosphate. The process was developed by the Russian National ____________________________________________________________________________________________________ Samara Petroleum and Organic Synthesis Closed Joint-Stock Management Co. Russian National Scientific Research Institute of Hydrocarbon Raw Materials Open Joint-Stock Co. Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 5, pp. 7– 10, September – October, 2013. 0009-3092/13/4905–0375 2013 Springer Science+Business Media New York
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Table 1
Boiling point, °C
Content of iso-C5 and n-C5 in azeotrope, mole %
Boiling point, °C
Content of iso-C5 and n-C5 in azeotrope, mole %
0.6 MPa
Content of iso-C5 and n-C5 in azeotrope, mole %
0.3 MPa
Boiling point, °C
0.1 MPa
iso-Ñ5- DMS
26.3
75.4
60.6
67.8
89.0
63.1
n -Ñ 5- DMS
32.7
52.1
66.3
46.7
92.0
43.0
System
iso -Ñ5- n-Ñ5
Zeotropic mixture
Scientific Research Institute of Hydrocarbon Raw Materials (VNIIUS), Kazan, which proposed use of the homogeneous phthalocyanine catalyst DSFK and acquired the name VNIIUS-12 [1]. The DSFK catalyst concentration in the alkali solution was 5000 ppm and the catalyst consumption rate was 0.5 g/ton. Later, the new highly effective catalyst IVKAZ was dev
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