Liquid phase hydrogenating method of hydrocarbon oil

Abstract

The invention discloses a liquid phase hydrogenating method of hydrocarbon oil. In the method, recycle hydrogen and a recycle hydrogen compressor are cancelled; hydrogen reacts with fresh raw oil and partial recycle oil in the presence of a solvent or a diluent to form a mixture flow, and the mixture flow enters a reactor to contact with a catalyst; the other part of or all recycle oil is mixed with hydrogen, and an obtained mixture enters the reactor by a path or branches from spaces between catalyst bed layers of the reactor; partial reaction effluent is subjected to hydrogen sulfide removal and then used as recycle oil, and the other part enters a separator; and the solubility of the hydrogen in the solvent or the diluent is larger than that in the mixture of the fresh raw oil and the solvent or the diluent.

Description

technical field [0001] The invention relates to the technical field of hydrocarbon oil processing in the presence of hydrogen, in particular to a liquid-phase hydrogenation method for hydrocarbon oil. Background technique [0002] In hydrocarbon oil processing technology, hydrogenation technology is one of the commonly used technologies to improve the quality of hydrocarbon oil. As the global crude oil market tends to supply crude oil with higher sulfur content, refineries need to process low-quality hydrocarbon oil with higher sulfur content. Impurities such as sulfur, nitrogen, oxygen and metals are removed during the refining process, and the quality of hydrocarbon oil is changed by changing the molecular structure, so that various products meet the specification requirements. The hydrogen that participates in the reaction in the hydrocarbon oil hydrogenation process is actually only hydrogen used for chemical hydrogen consumption, while the traditional trickle bed reacto...

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Problems solved by technology

[0010] Whether it is US6428686 or CN200810049938.7, the reactor outlet stream is directly recycled to the reactor inlet or between the catalyst beds without removing hydrogen sulfide, although CN200810049938.7 uses the liquid phase from the separator as circulating oil, from the separation The liquid phase out of the reactor contains dissolved hydrogen sulfide, which is produced by removing sulfide from the raw material during the hydrogenation reaction. This is the desired reaction of the hydrogenation reaction, but the hydrogen sulfide in the cycle oil will affect Catalyst activity, inhibiting the access of sulfur-containing compounds to the active center of the catalyst, reducing the activity and selectivity of the catalyst, which is an undesirable result

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