Method for producing cleaning oil from coal-tar oil

Abstract

The invention relates to the method to produce clean oil by coal tar, especially the hydrocracking technology of the coal tar. The characteristic of the invention includes: after removing the mechanical impurities and water, the coal tar enters the hydrogenation refining reactor to hydrogenate, remove the metal, remove sulphur, remove nitrogen and remove oxygen to get the refined oil; the refined oil enters the fractionator to separate the heavy magnesium carbonate distillate and the light magnesium carbonate distillate; part of the heavy magnesium carbonate distillate enters the refining reactor and the other part enters the cracking reactor or all the heavy magnesium carbonate distillate enters the cracking reactor to get the hydrocracked oil; the hydrocracked oil enters the fractionator to be separated into light magnesium carbonate distillate and heavy magnesium carbonate distillate. Compared to the present technologies, the invention can broaden the source for clean oil producing and improve the quality of the coal tar products; besides, the catalyst in the invention has long service life and the device can operate steadily.

Description

technical field [0001] The invention discloses a method for producing clean oil from coal tar. Coal tar is used as a raw material to produce high-quality clean oil through hydrofining and hydrocracking. Background technique [0002] With the rapid development of the world economy, the demand for fuel oil products is increasing, and the quality requirements for oil products are becoming more and more stringent. The world's proven reserves of crude oil can only be used continuously for more than a hundred years based on the current production volume, and the shortage of oil resources is imminent. However, the storage of coal is very abundant, so using coal to produce vehicle fuel oil is a way. The main technologies of coal-to-oil include direct coal liquefaction and coal indirect liquefaction, etc., but these technologies are costly and expensive. complex. Another technology for coke production is that the by-product is coal tar while producing coke, which is a widely used t...

AI Technical Summary

Problems solved by technology

[0005] CN1331130A introduces a method for producing diesel oil by hydrogenation of coal tar, mainly through fractionation of coal tar, the fraction below the diesel oil obtained is hydrotreated, and can directly produce diesel oil that meets the fuel oil index or as a blending component of diesel products. But it only hydrotreats the lighter fraction of coal tar, and does not fully utilize coal tar

However, coal tar is a special hydrocarbon raw material. Experimental results show that this process cannot keep the catalyst running for a long period, especially the modified catalyst will cause non-renewable deactivation in a short period of time.

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