Hydrotreating method for producing motor fuels with biological oil and fat

Abstract

The invention discloses a hydrotreating method for producing motor fuels by hydrogenation of biological oil and fat. The method comprises the steps of (a) selecting one or more of the biological oil and fat as raw oil; (b) passing the raw oil and hydrogen successively through at least two reduced hydrogenation catalyst layers which has increased content of a hydrogenation active component in sequence, wherein the raw oil and hydrogen are introduced in from the bottom of the reactor, firstly passes through the reduced hydrogenation catalyst layer with low content of the hydrogenation active component, and then asses through the reduced hydrogenation catalyst layer with high content of the hydrogenation active component; (c) discharging effluent after the reaction from the top of the reactor, separating the effluent after the reaction into a gas phase and a liquid phase, wherein the gas phase is used circularly, and the liquid phase is introduced into a fractionating tower; and (d) fractionating in the fractionating tower to obtain naphtha, diesel oil and unconverted oil, wherein partial of the diesel oil and / or partial of the unconverted oil can be returned to the reaction system. The method provided by the invention can guarantee that a hydrogenation apparatus of the biological oil and fat runs stably in a long period.

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 hydrogenation unit is poor, the operation period is short, and the catalyst needs to be frequently shut down to replace

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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