Two-stage hydrogenation method for producing high quality solvent oil

Abstract

The present invention relates to a two-stage hydrogenation method for producing a high quality solvent oil. 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 hydrocracking reaction zone; the sub-hydrogen gas separated from the oil generated through second stage hydrogenation is recycled at the second stage; and the separated liquid product is subjected to fractionation to obtain various solvent oils, 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 reduction state Pt and / or Pd 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: 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 high-quality 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 a...

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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