METHOD FOR HYDROGENATION TREATMENT OF OIL STOCK Russian patent published in 2016 - IPC C10G65/12 C10G45/22 

FIELD: oil industry.

SUBSTANCE: invention relates to a method for hydrogenation treatment of oil stock at high temperatures and pressure. Method includes following steps: a) hydrogen saturation of oil stock by dissolving hydrogen in feedstock prior before feeding for hydrogenation treatment at temperature of 50-350 °C and pressure 1.0-20.0 MPa separately in mass exchange apparatus, providing developed and evenly distributed surface of contact of gas phase and liquid phase of oil stock; b) hydrofining, for removal from oil stock of sulphur and nitrogen, at temperature of 340-400 °C and pressure 1.0-20.0 MPa in a catalytic reactor, enabling to maintain given process temperature in granular catalyst bed by heat removal from reaction zone through a heat-transfer wall by an external heat carrier; c) hydrogen saturation of purified from sulphur compounds and nitrogen oil stock or feedstock, requiring no hydrofining by dissolving hydrogen in feedstock prior to feeding for hydrocracking, at temperature of 50-400 °C and pressure 1.0-20.0 MPa separately in mass exchange apparatus, providing developed and evenly distributed surface of contact of gas phase and liquid phase of oil stock; d) hydrocracking of oil stock saturated with hydrogen at step (c), at temperature of 350-460°C and pressure 1.0-20.0 MPa in a catalytic reactor, enabling to maintain given process temperature in granular catalyst bed by heat removal from reaction zone through a heat-transfer wall by an external heat carrier. Processes for hydrogen saturation of oil stock at steps (a) and (c) are performed in mass exchange apparatus by passing through it oil stock and hydrogen, hydrogen undissolved in hydrocarbon feedstock circulates through mass exchange apparatus, and hydrogen-saturated hydrocarbon feedstock is directed for hydrofining and/or hydrocracking at steps (b) and (d), processes of hydrofining and/or hydrocracking of oil stock at steps (b) and (d) are carried out at high volume rate of oil stock only due to hydrogen dissolved in said feedstock at steps (a) and (c), without supply of gaseous hydrogen in hydrocarbon material before hydrofining and hydrocracking reactors and into said reactors, and degree of extraction of sulphur and nitrogen from oil stock when hydrofining, as well as depth of processing oil stock with hydrocracking is only due to recycling a portion of said fluid stock via steps (a) and (b) and/or (c) and (d).

EFFECT: disclosed method enables to achieve required processing depth of oil stock, reduced hydrogen consumption longer service life of catalyst increased volumetric supply of feedstock, and, as a result, reduced weight and size characteristics of catalytic hydrogenation reactors, lower pressure of hydrogenation process, and thus reducing power consumption.

4 cl, 1 dwg