Two-phase hydrogenation process

Abstract

The present invention discloses a biphase hydrogenation method, which cancels circulating hydrogen and a circulating hydrogen compressor. Hydrogen is mixed with fresh crude oil and circulating oil under the existence of a solvent or a diluting agent so as to form a mixture flow; the mixture flows into a reactor to contact a catalyst; after the other part of the circulating oil is mixed with hydrogen for gas discharging, a circuit or a shunt circuit enters the reactor between reactor catalyst bed layers; after the solvent or the diluting agent is mixed with hydrogen for gas discharging, a circuit or a shunt circuit enters the reactor between reactor catalyst bed layers; the reacted effluent is used for gas-liquid separation and the liquid phase further separates the solvent or the diluting solvent for recycling use; a part of the separated liquid product is used as the product and the other part is used as the circulating oil.

Description

technical field [0001] The invention relates to hydrocarbon oil hydrogenation technology, in particular to liquid-solid two-phase hydrocarbon oil 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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