Heavy benzene hydro-upgrading method

Abstract

The invention discloses a heavy benzene hydro-upgrading method. The method includes: filtering the raw material heavy benzene, mixing the filtered heavy benzene with hydrogen, then adding the mixture into a pre-hydrofining reaction area to undergo reaction, subjecting the reaction effluent to gas-liquid separation, cycling part of a liquid phase product back to the pre-hydrofining reaction area, heating the rest part of liquid phase product and making it enter a main hydrogenation reaction area to pass through a hydrogenation protection reaction area and a main hydrofining reaction area to undergo hydrogenation reaction, leading the obtained hydrofining product into a separation system, bringing the separated liquid phase product into a hydro-upgrading reaction area to undergo hydro-upgrading reaction, and separating the hydro-upgrading product, thus obtaining gasoline and diesel fractions. The method provided by the invention can greatly reduce the temperature rise in the pre-hydrofining reaction area, extend operation cycle of equipment, reduce the load of a circulating hydrogen compressor, and save equipment investment, thus providing a high economical processing method for heavy benzene with low added value. The method not only develops new application of the raw material, but also expands the raw material sources of clean fuel oil, and increases the cetane number of diesel.

Description

technical field [0001] The invention relates to a hydrogenation method for heavy benzene, in particular to a two-stage hydrogenation method for producing clean fuel oil. Background technique [0002] The increasing scarcity of the world's petroleum resources has made the technology of processing and producing clean fuel oil from various unconventional petroleum resources a hot spot. One of the technologies is to produce clean fuel oil using coal chemical by-products as raw materials. [0003] Heavy benzene is a by-product produced during the crude benzene hydrogenation refining process in the coal chemical industry. In the crude benzene hydrogenation process, the raw material crude benzene is separated in a multi-stage evaporator, and high boiling point components such as trimethylbenzene, naphthalene, and indene Man, coumarone, etc. are discharged from the bottom of the multi-stage evaporator as residual oil, and this part of residual oil is heavy benzene. [0004] The pro...

AI Technical Summary

Problems solved by technology

The invention can not only produce clean gasoline and diesel products through hydrogenation reaction of heavy benzene, but also can effectively solve the problem of large temperature rise in the pre-hydrogenation refining reaction zone, protect the activity stability of the hydrogenation reforming catalyst, and ensure the safety of the device. Benefit from smooth operation and extended unit run time

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