Hydrofining technology of heavy benzol

Abstract

The invention discloses a hydrofining technology of heavy benzol, which is characterized in that heavy benzol is filtered and is mixed with hydrogen to successively enter a fixed bed pre-hydrogenation reactor and a fixed bed main hydrogenation reactor for selective hydrofining; the obtained hydrogenated oil is converted into solvent oil and industrial naphthalene after cooling, gas stripping, distillation, rectification and the like. The heavy benzol has favourable quality, high additional value and small pollution to environment when the heavy benzol is used, the device has long operation period, and the invention provides a new path for effectively using heavy benzol.

Description

technical field [0001] The invention relates to the effective utilization of heavy benzene, in particular to a method for obtaining products such as solvent oil and process naphthalene after heavy benzene is hydrogenated and refined. Background technique [0002] Heavy benzene refers to the by-product obtained from the bottom of the dibenzene tower when the crude benzene is rectified by the acid washing method or the by-product obtained from the bottom of the pre-fractionating tower when the crude benzene is pre-fractionated by the hydrogenation method. Heavy benzene is mainly composed of aromatic compounds such as xylene, mesitylene and naphthalene, high-boiling unsaturated compounds such as styrene, coumarone and indene, and macromolecular sulfur- and nitrogen-containing compounds. At present, the processing and utilization of heavy benzene mainly focus on ① production of fuel oil: the production of fuel oil after mixing heavy benzene with other raw materials not only has ...

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Problems solved by technology

At present, the processing and utilization of heavy benzene mainly focus on ① production of fuel oil: the production of fuel oil after mixing heavy benzene with other raw materials not only has low added value, but also sulfur and nitrogen-containing compounds in heavy benzene will produce a large amount of SO during combustion x and NO x , causing serious environmental pollution; ②Direct extraction of chemical products: the method of extracting heavy benzene through initial distillation and rectification is simple, and a variety of valuable chemical products are extracted, which increases the added value of heavy benzene products to a certain extent , but the high content of sulfur and nitrogen compounds in heavy benzene cannot be removed, and environmental protection problems still exist

On the other hand, due to the presence of coking-prone precursors such as styrene, cycloolefin, coumarone, and indene in heavy benzene, coking problems will inevitably occur during the initial distillation and rectification of heavy benzene, which will affect the device. continuous operation and economic benefits; ③ production of coumarone-indene resin by catalytic polymerization: this method only utilizes coumarone and indene components in heavy benzene, and aromatic compounds such as xylene and trimethylbenzene in heavy benzene raw materials Not utilized, wasting valuable aromatics resources

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