A hydrogenation method for producing high-quality motor fuel from bio-oil

Abstract

The invention relates to a hydrogenation method for producing a high-quality motor fuel with biological grease. The method comprises: taking one or several kinds of biological grease as raw oil; passing the raw oil and hydrogen through at least two precious metal hydrogenation catalyst beds, the hydrogenation active component contents of which increase in order, leaving the raw oil and hydrogen first to pass through a catalyst bed with low hydrogenation active component content and then to pass through a catalyst bed with high hydrogenation active component content, with reduced Pt and / or Pd adopted as the hydrogenation active component under a reaction state; separating a hydrogenation effluent into a gas phase and a liquid phase, recycling the gas phase and leaving the liquid phase to enter a fractionating tower; conducting fractionation in the fractionating tower so as to obtain naphtha, diesel oil and unconverted oil, circulating part of the diesel oil and / or part of the unconverted oil back to a reaction system. Compared with prior art, the method of the invention not only can effectively improve the storage stability of biological grease taken as fuel oil, and simultaneously can realize long-period stable operation of a device.

Description

technical field [0001] The invention relates to a hydrogenation method, in particular to a hydrogenation method for directly producing high-quality 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 various resea...

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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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