METHOD FOR HYDROCONVERSION OF HEAVY OIL FRACTIONS Russian patent published in 2015 - IPC C10G47/02 C10G47/36 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for hydroconversion of heavy oil fractions - feed stock, the method including a zero step and subsequent N steps. The zero step includes feeding, into a reactor, material, a catalyst precursor - aqueous solution of a Mo (VI) salt or salts of Mo and Ni, and hydrogen at pressure of 4-9 MPa under normal conditions; reacting the material and hydrogen at 420-450°C in the presence of a precursor of a suspended nanosize molybdenum or molybdenum-nickel catalyst formed in the reactor; atmospheric or atmospheric-vacuum distillation of the hydrogenation product; removing the low-boiling fraction with a boiling point not higher than 500°C as a product and returning the high-boiling fraction or part thereof into the reactor. The next steps include feeding, into the reactor, material, a catalyst precursor, the returned part of the high-boiling fraction and hydrogen; reaction thereof; said atmospheric distillation of the hydrogenation product; removing the low-boiling fraction as a product; returning part of the high-boiling fraction into the reactor; burning at 1000-1300°C or gasification of the remaining part of the high-boiling fraction, after which trapped ash-slag residues are subjected to further oxidising burning at 800-900°C and the obtained ash product, which is carbon-free, is used to regenerate the catalyst precursor and produce an industrial concentrate of vanadium and nickel. The number of steps N is determined using formulae: $$b^d\cdot (n_n+n_m+1)=a+{\displaystyle {\sum }_{i=1}^{n_m}{b}_i+b^e\cdot n_m},$$ N=n_n+n_m+1, where n_n is the number of steps with recirculation, after which equilibrium output of the low-boiling fractions is achieved; n_m is the number of steps with recirculation after achieving equilibrium output of the low-boiling fractions, which enables to achieve a given output of low-boiling fractions from the feed stock; b^d is the given output of low-boiling fractions, wt %; a is the output of low-boiling fractions at the zero step, wt %; b_i is the output of low-boiling fractions at the i-th step before achieving equilibrium, wt %; b^e is the output of low-boiling fractions after achieving equilibrium, wt %, b^e>b^d.

EFFECT: high output of low-boiling fractions, low molybdenum consumption, high degree of extraction of molybdenum, vanadium and nickel from the solution, enabling calculation of the required reactor volume, obtaining an industrial concentrate of vanadium and nickel, low hydrogen consumption.

3 cl, 1 dwg, 2 tbl, 2 ex