Method and device for preparing low carbon olefine and arene

Abstract

The low carbon olefin and arene producing process includes the following steps: hydroprocessing material oil to obtain hydrogenated tail oil; catalytically cracking and separating catalytically cracked oil and gas to obtain C2=-C3=, C2o-C3o, C4-C5, naphtha, LCO, etc.; returning C4-C5 to catalytical cracking, returning LCO to hydroprocessing, selectively hydrogenating and solvent extracting naphtha to obtain raffinate oil and arene as one target product; steam cracking raffinate oil, hydrogenated C2o-C4o, hydrogenated naphtha and cracked C2o-C3o and separating reacted oil and gas to obtain C2=-C3=, C2o-C3o, C4-C5, naphtha, etc.; returning C2o-C3o to steam cracking, and returning C4-C5 to catalytical cracking. The producing apparatus includes hydroprocessing unit, atalytically cracking unit, steam cracking unit, selectively hydrogenating unit and solvent extracting unit. The present invention produces low carbon olefin with heavy material and has propylene yield over 30 wt% and co-produced toluene, etc.

Description

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AI Technical Summary

Benefits of technology

This technology allows for efficient production of lightweight lower carbon molecules like propane or butanes that are important chemical products used throughout industry. By maximizing yields over these sources, this process produces more valuable compounds than traditional methods without producing unwanted side reactions.

Problems solved by technology

This patents discuss various technical problem addressed during research into improving the efficiency of converting feedstock molecules like natural resources, specifically coal, towards useful compounds called fuel precursors. Current techniques involve expensive processes involving multiple steps including pyrolysis, hydrocracking, separation, purification, etc., resulting in lower yields compared to current options. Therefore there is a desire to provide a new approach for efficiently making these valuable chemical starting sources without requiring extensive processing equipment.

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