Liquid-solid two-phase hydrogenation method

Abstract

The invention discloses a solid-liquid two phase hydrogenation method. In the method, the circulating hydrogen and a circulating hydrogen compressor are not used, hydrogen is mixed with fresh raw oil and circulating oil to form mixing material current in the presence of a solvent or a diluent, the mixing material current enters a reactor, a part of or all the circulating oil is mixed with the hydrogen, and enters the reactor from the catalyst bed interlayers through one path or a plurality of branch paths, a part of the reaction effluent is used as the circulating oil, and another part of the reaction effluent is separated to be the solvent or the diluent, the liquid product is the finished product, the gas with the volume percentage of between 0.1 and 15 percent is contained in the reactor according to the total volume of the reactor, and the solubility of the hydrogen in the solvent or the diluent is larger than that in the mixture of fresh raw oil and the solvent or the diluent.

Description

technical field [0001] The invention relates to hydrocarbon oil hydrogenation technology, in particular to a liquid-solid two-phase hydrogenation method. 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 large amount of e...

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Problems solved by technology

[0008] The above improvements still require circulating hydrogen and circulating hydrogen compressors. US6428686 proposes a liquid-phase hydrogenation method, which dissolves hydrogen in the raw material 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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