Two-stage hydrogenation method for producing solvent oil

Abstract

The present invention relates to a two-stage hydrogenation method for producing a solvent oil. 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 hydrocracking reaction zone; the sub-hydrogen gas after hydrocracking 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: low aromatic hydrocarbon solvent oil production methods are increased, 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 solvent oil by using biological oil as raw material oil. Background technique [0002] The world economy continues to develop. At present, the main sources of chemical products worldwide are fossil energy, the most important of which are petroleum and coal. These two kinds of fossil energy are both non-renewable energy. Not only are the resources increasingly depleted, but also the quality and inferiority are intensified, and the difficulty and cost of processing are gradually increasing. In addition to improving the existing oil refining technology, looking for new oil substitutes, To produce qualified products at the lowest cost, especially the development and utilization of renewable resources has been paid more and more attention. [0003] As a renewable resource, bio-grease is mainly composed of carbon, hydrogen and oxygen, wh...

AI Technical Summary

Problems solved by technology

At present, the raw materials for the production of high-grade low-aromatic solvent oil are limited (generally limited to gasoline fractions or kerosene fractions of paraffin-based crude oil, or reformed raffinate, etc.), due to the requirement of low aromatics content (some solvent oil indicators require aromatics content to be less than 0.1 %), so complex processing routes are required, the conditions are harsh, and the production cost is high, which limits the production of high-grade low-aromatic solvent oil

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