Two-stage hydrogenation method for producing low freezing point motor fuel

Abstract

The present invention relates to a two-stage hydrogenation method for producing a low freezing point motor fuel. The method is characterized in that a biological oil raw material and hydrogen pass through a first stage hydrogenation reaction zone containing at least two hydrogenation reactors, wherein the mixture passes through a low temperature operation reactor, and then passes through a high temperature operation reactor; the hydrogen-rich gas is recycled at the first stage; the liquid enters a second stage hydrogenation modification reaction zone; the sub-hydrogen gas after hydrogenation modification is recycled at the second stage; the liquid product is subjected to fractionation to obtain naphtha and a low freezing point diesel oil; and under a reaction state, active components of the hydrogenation catalyst used at the first stage are one or a plurality of materials selected from sulfurization state W, Mo, Ni and Co, and active components of the hydrogenation catalyst used at the second stage are one or a plurality of materials selected from reduction state W, Mo, Ni and Co. Compared to the method in the prior art, the method of the present invention has the following advantages that: a low freezing point motor fuel can be produced, activity stability of the catalyst can be ensured, and stable and long period device operation can be ensured.

Description

technical field [0001] The invention relates to a hydrogenation method, in particular to a two-stage hydrogenation method for directly producing low-freezing-point 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, a...

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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 shortened, and the catalyst needs to be frequently shut down to replace it.

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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