Method for biphase hydrogenation of hydrocarbon oil

Abstract

The present invention discloses a method for biphase hydrogenation of hydrocarbon oil. According to the method, recycle hydrogen and a recycle hydrogen compressor are cancelled; hydrogen is mixed with fresh raw oil and one part of 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; after the other part of the recycle oil is mixed with the hydrogen and the gas is discharged, an obtained mixture enters the reactor by a path or branches from spaces between catalyst bed layers of the reactor; after the solvent or the diluent is mixed with the hydrogen and the gas is discharged, an obtained mixture enters the reactor by a path or branches from spaces between catalyst bed layers of the reactor; the reaction effluent is subjected to gas-liquid separation, and the liquid phase is further separated to obtain the solvent or the diluent, wherein the separated solvent or the separated diluent is used for recycle use; and the partial separated liquid product is used as the product, and the partial separated liquid product is used as the recycle oil.

Description

[0001] This application is the application number: 200810140990.3, the application date is: August 11, 2008, and the name is: a divisional application of a two-phase hydrogenation method technical field [0002] The invention relates to hydrocarbon oil hydrogenation technology, in particular to liquid-solid two-phase hydrocarbon oil hydrogenation technology. Background technique [0003] 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 p...

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Problems solved by technology

[0009] 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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