Liquid-solid two-phase hydrogenation method for hydrocarbon oil

Abstract

The invention discloses a method of hydrocarbon oil liquid-solid two-phase hydrogenation; the method avoids the recycle hydrogen and the recycle hydrogen compressor; hydrogen is mixed with fresh raw oil and a part of recycle oil under the existence of solvent or diluent; after the gas is separated in the mixer, the mixture is fed into the reactor and is contacted with the catalyst for reaction after the gas is separated on top of the reactor; the other part of the recycle oil is mixed with hydrogen and solvent or diluent and the gas is separated; the mixture is all or partially fed into the bed of the catalyst; the effluent of the reaction is discharged from the bottom of the reactor for separation; the separated solvent or the diluent is used for recycle use; the liquid product is used as the product or the recycle oil; the solubility of hydrogen in solvent or diluent is more than the solubility of hydrogen in the mixture of fresh raw oil and solvent or diluent.

Description

technical field [0001] The invention relates to hydrocarbon oil hydrogenation technology, in particular to hydrocarbon oil liquid-solid two-phase hydrogenation technology. 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. In the hydrocarbon oil hydrogenation process, the only hydrogen that participates in the reaction is hydrogen used for chemical hydrogen consumption, while the traditional trickle bed reactor hydrogenation technology requires a...

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Problems solved by technology

[0008] The above improvements still require circulating hydrogen and circulating hydrogen compressors. US6428686 proposes a two-phase hydrogenation method, which dissolves hydrogen in raw oil before the reactor, cancels circulating hydrogen and circulating hydrogen compressors, and reduces the hydrogenation unit. investment and operating costs, the technology uses the liquid phase circulation of the reaction product to increase the dissolved amount of hydrogen to meet the hydrogen requirements in the hydrogenation process and bring out the heat of reaction. After mixing, it enters the hydrogenation reactor. The disadvantage is that the existence of a large amount of circulating oil will affect the reaction rate of fresh raw materials and hydrogen, because the reaction between fresh raw materials and hydrogen is relatively intense when they start to contact with the catalyst, and the existence of circulating oil inhibits the reaction rate of fresh raw materials. The contact chance of oil and hydrogen with catalyst reduces the mass transfer and reaction rate of fresh raw oil and hydrogen

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