Heavy benzene hydrogenation working circulation method
A heavy benzene, sub-circulation technology, applied in the chemical industry, can solve the problems of lack of competitiveness, poor stability, low quality, etc., and achieve the effect of increasing the start-up cycle operation, increasing the flexibility of the operation, and facilitating the operation.
Active Publication Date: 2015-02-25
SHANGHAI INSTALLATION ENG GRP
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Problems solved by technology
In addition, because heavy benzene contains a certain amount of heterocyclic compounds such as S, N, and O, when used as solvent oil, it has a pungent odor in addition to poor stability; when used directly as fuel oil, not only the quality is not high, but also pollutes Environment, that is, these uses currently have problems with poor product quality, lack of competitiveness, or pollution of the environment
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[0019] A heavy benzene hydrogenation start-up circulation method, which is realized by establishing the independent circulation of the pre-fractionation unit 8, the reaction unit 10, and the fractionation unit 12, the two-by-two circulation between each unit, and the overall large circulation in which the three units participate together The normal operation of the heavy benzene hydrotreating process unit.
[0020] Such as figure 1 As shown, the heavy benzene hydrogenation unit includes a buffer tank A7, a pre-fractionation unit 8, a buffer tank B9, a reaction unit 10, a low fractionation tank 11 and a fractionation unit 12 successively from upstream to downstream. Establish the independent circulation of the pre-fractionation unit 8, the reaction unit 10, the fractionation unit 12, the two-two circulation between each unit, and the overall large circulation in which the three units participate together to realize the start-up of heavy benzene hydrogenation.
[0021] The bot...
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Abstract
The invention relates to a heavy benzene hydrogenation working circulation method; according to the method, through establishment of independent circulation of a pre-fractionation unit (10), a reaction unit (12) and a fractionation unit (14), pair circulation of all the units and co-participated whole big circulation of the three units, normal working of a heavy benzene hydrogenation processing process device is achieved. Compared with the prior art, the method is simple and convenient to operate, increases working circulation operations among the units, improves equipment operating flexibility based on no increase of any equipment investment, is beneficial for ensuring smooth operating of the device, and prolongs the catalyst service life in a heavy benzene hydrogenation reaction process.
Description
technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a heavy benzene hydrogenation start-up cycle method. Background technique [0002] 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, Indene , naphthalene, oxygen Indene Wait as the residual oil is discharged from the bottom of the multi-stage evaporator, this part of the residual oil is heavy benzene. The initial boiling point of heavy benzene is 55-100°C, the dry point is 230-280°C, and the density at 20°C is about 1000kg / m 3 , the total amount of aromatics is generally 60-85wt%, the main components are toluene, xylene, trimethylbenzene, naphthalene, 1-methylnaphthalene, 2-methylnaphthalene, etc., and the unsaturated c...
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IPC IPC(8): C10G67/00
CPCC10G67/00C10G2300/1096
Inventor 高希张建光王永贵
Owner SHANGHAI INSTALLATION ENG GRP