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 is adopted as a raw material oil; under a hydrogenation condition, the raw material oil and hydrogen are mixed, and pass through a first stage hydrogenation reaction zone; the stream generated from hydrogenation is separated to obtain hydrogen-rich gas; the hydrogen-rich gas is recycled at the first stage; the separated liquid enters a second stage hydrogenation modification reaction zone; the sub-hydrogen gas separated from the oil generated through second stage hydrogenation is recycled at the second stage circulation; and the separated liquid product is subjected to fractionation to obtain naphtha and low freezing point diesel oil, wherein hydrogenation activity 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 hydrogenation activity 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 under a reaction state. Compared to the method in the prior art, the two-stage hydrogenation method of the present invention has the following characteristics that: the 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 carbon deposition in the bed causes the operation cycle to be shortened, and the catalyst needs to be frequently shut down to replace

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