Hydroprocessing method for producing motor fuel from bio-oil

Abstract

The invention relates to a hydroprocessing method for producing motor fuel from biological oil. The hydroprocessing method comprises the following steps of: by taking one or several kinds of biological oil as raw oil, leading the raw oil and hydrogen to pass through at least two hydrogenation catalyst beds with sequentially increasing contents of hydrogenation active components under a hydrogenation operation condition, wherein the raw oil and the hydrogen firstly pass through the catalyst bed with low content of the hydrogenation active components and then pass through the catalyst bed with high content of the hydrogenation active components, and the hydrogenation active components are one or more of W, Mo, Ni and Co in a reduction state under a reaction state; separating a hydrogenation effluent into a gaseous phase and a liquid phase, wherein the gaseous phase is circularly used and the liquid phase is fed into a fractionating column; and fractionating the liquid phase in the fractionating column to obtain naphtha, diesel and unconverted oil, wherein partial diesel and / or partial unconverted oil are circulated back to a reaction system. Compared with the prior art, the hydroprocessing method disclosed by the invention not only can be used for effectively improving the storage stability of the biological oil serving as fuel oil, but also can be used for simultaneously realizing the long-term stable operation of a device.

Description

technical field [0001] The invention relates to a hydrogenation treatment method, in particular to a hydrogenation treatment method for directly producing motor fuel by using biological oil as raw material oil. Background technique [0002] At present, the energy on a global scale mainly comes from fossil energy, among which petroleum is the most important source of motor fuel. Petroleum is a non-renewable energy source. Not only are the resources increasingly depleted, but also the quality and inferiority are intensifying. The continuous development of the world economy and increasingly stringent environmental protection regulations require the production of a large amount of light and clean fuels, which require the existing refining technology to be improved and improved. While improving, new oil substitutes are added to produce products that meet the requirements at the lowest cost. [0003] As a renewable resource, bio-oil has been widely valued in the world, and variou...

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Problems solved by technology

[0005] EP1741767 and EP1741768 disclose a method for producing diesel fractions from animal and vegetable oils, mainly animal and vegetable oils first undergo hydrogenation, and then pass through an isomerization catalyst bed to obtain low-condensation diesel components, but due to the hydrogenation Water is generated during the process, which has a very adverse effect on the isomerization catalyst, and the device cannot run stably for a long period of time

[0006] In the bio-oil hydrogenation process including the above method, one of the main problems encountered is that the stability of the catalyst is poor, the operation cycle is short, and the catalyst needs to be frequently shut down to replace the catalyst

Especially when bio-oil is used as raw material alone or the mixing ratio of bio-oil is high, the operation cycle of the hydrogenation catalyst will be significantly affected, which cannot meet the requirements of industrial applications

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