Combined coal tar whole fraction hydroprocessing system and application thereof

Abstract

The invention relates to a combined coal tar whole fraction hydroprocessing system and an application thereof. The system comprises a desalination dehydration impurity-removing refining system 1 which is connected with a hydrogen compressor 11 and an up-flow moving bed hydrofining reactor 3 respectively through one hydrogenation feeding pump 12, the up-flow moving bed hydrofining reactor 3 is respectively connected with a catalyzer on-line feeding system 2 and two series connection fixed bed hydrofining reactors 4, the fixed bed hydrofining reactors 4 are connected with separators 5, the separators 5 are respectively connected with a hydrogen refining system 10 and a flash tower 6, the flash tower 6 is connected with a fixed bed hydrocracking reactor 7 through the other hydrogenation feeding pump 12 and then sequentially connected with a fixed bed hydrofining reactor 8, the separators 5 and a fractionating tower 9. Compared with combined coal tar whole fraction hydroprocessing systems in the prior art, the combined coal tar whole fraction hydroprocessing system has the advantages that the process is simpler, the conversion rate is higher, operation is stable, product properties are good, and the system can be used for production processes of excellent light fuels by poor raw materials such as various coal tar, shale oil and residual oil.

Description

technical field [0001] The invention relates to a process for treating the whole fraction of coal tar, especially the whole fraction of coal tar is used as a raw material, and it is also suitable for the processing of inferior raw materials such as coal tar, shale oil, residue oil, etc., and is produced by a combined hydrogenation treatment process Methods and systems for cleaning light fuels. Background technique [0002] Coal tar is one of the liquid products obtained during the dry distillation and gasification of coal. It is an extremely complex mixture that is mainly used to produce benzene, toluene, xylene, and naphthalene, anthracene, acenaphthene, and pyrene by means of separation. And other chemical products and asphalt products. [0003] Due to the sharp rise in crude oil prices in the international market, the market demand for light petroleum products is large, and the price rises accordingly. Therefore, the production of light fuel oil products from coal tar is...

AI Technical Summary

Problems solved by technology

[0007] CN1351130A firstly fractionates the coal tar, and carries out hydrogenation upgrading on the light fraction, but its main disadvantage is that the raw materials are not fully utilized

The existing device process is relatively simple, unable to achieve the purpose of deep desalination, dehydration, and slag removal

[0018] 2. Hydrogenation process: The hydrogenation process of the existing equipment adopts a two-stage fixed-bed series reaction process. The first-stage hydrofinishing and the second-stage hydrocracking all use downflow fixed-bed reactors. There is no A separator is installed so that the process is shortened, but the water and alkaline ammonia nitrogen produced in the first stage of hydrogenation will cause fatal poisoning damage to the acidic catalyst in the second stage reactor, and the effect of the second stage of hydroisomerization depreciation will lose its effect. Therefore, the cetane number of existing diesel oil can only be maintained below 40

Images