Rotational flow-washing-rotational flow combined hot high-pressure separation method and device in suspended bed hydrogenation process

Abstract

The invention relates to a rotational flow-washing-rotational flow combined hot high-pressure separation method and a device in a suspended bed hydrogenation process. The method comprises the steps that primary rotational flow separation is conducted on a high-temperature and high-pressure multi-phase mixture after a hydrogenation reaction, so that most catalyst granules are removed; a light-component mixture separated by the primary rotational flow separation is sprayed and washed by a washing solution; secondary micro rotational flow separation is conducted on the sprayed and washed light-component mixture containing liquid drops and few catalyst granules; heavy components obtained from the primary rotational flow separation and the secondary micro rotational flow separation are mixed with the sprayed and washed washing solution; decompression flash is conducted on the heavy components and the washing solution together to recover distillate oil of the heavy components and the washing solution; hydrotreatment is conducted on the light-component mixture obtained after the secondary micro rotational flow separation and the distillate oil recovered by the decompression flash; cold separation is conducted on hydrotreated products to achieve the separation of the distillate oil and gas; hydrogen is recycled after a separated gas phase is purified; and component products are obtained by fractionating a liquid phase.

Description

technical field [0001] The invention belongs to the field of petroleum processing, and relates to a cyclone-washing-cyclone combined thermal high-pressure separation method and device, more specifically, to a cyclone dehydration and spray dedusting and thermal high-pressure tower in a residual oil hydrogenation process. Device connection method and device. Background technique [0002] In the petroleum refining industry, the key to improving petroleum utilization is to maximize the conversion of vacuum residue into transportation fuels, especially diesel. VCC vacuum residue suspension bed hydrocracking is an integrated process in which the suspension bed hydrogenation reaction system and the fixed bed hydrotreatment system operate at the same temperature and pressure, and are connected by a hot high-pressure separator in the middle. Compared with other technologies, this integrated process has low investment, high product quality and high thermal efficiency. [0003] Howev...

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Problems solved by technology

[0007] Therefore, in view of the characteristics of high pressure, high temperature and large processing capacity of the high temperature and high pressure separator in the hydrogenation reaction process, and considering the current situation of insufficient separation capacity of the traditional hot high pressure separator, it is necessary to adopt an efficient, reliable and applicable Economical thermal high-pressure separation method and device for long-term operation

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