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Reclaiming device and separation method for heavy component residue of coked crude benzene hydrogenation process

A technology for coking crude benzene and heavy components, applied in distillation purification/separation, organic chemistry, etc., can solve the problems of large gaps in benzene raw materials, and achieve the effects of high product purity, low operating temperature, and simple process

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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the emergence of the oil crisis, the shortage of benzene raw materials in the country is even greater

Method used

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  • Reclaiming device and separation method for heavy component residue of coked crude benzene hydrogenation process
  • Reclaiming device and separation method for heavy component residue of coked crude benzene hydrogenation process
  • Reclaiming device and separation method for heavy component residue of coked crude benzene hydrogenation process

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Experimental program
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Effect test

Embodiment 1

[0020] see figure 1 , the present invention comprises weight removal tower 1, light removal tower 2, trimethylbenzene tower 3, indane tower 4 and tetralin tower 5; Feed port is communicated; the outlet at the bottom of the light removal tower 2 and the feed inlet in the middle of the trimethylbenzene tower 3, the outlet at the bottom of the trimethylbenzene tower 3 and the middle feed inlet of the indane tower 4, The outlet at the bottom of the indane tower 4 is communicated with the middle feed inlet of the tetralin tower 5 through pipelines respectively; Device 12, trimethylbenzene tower reboiler 13, indane tower reboiler 14 and tetralin tower reboiler 15 are communicated with, and the tower top of each tower is respectively connected with weight-removing tower condenser 6, light-removing tower condenser 7, The trimethylbenzene tower condenser 8, the indane tower condenser 9 and the tetralin tower condenser 10 are in communication, and each of the above-mentioned condenser...

Embodiment 2

[0024] The separation and purification process of the present invention will be described below with the separation and purification process of the heavy component raffinate in the coking crude benzene hydrogenation process of a certain plant.

[0025] The material composition of the heavy component raffinate produced by the coking crude benzene hydrogenation process is shown in Table 1.

[0026] Separation steps:

[0027] ①The heavy component raffinate produced by the coking crude benzene hydrogenation process is fed into the weight removal tower 1 at a flow rate of 6250kg / h. The operating pressure at the top of the tower is 5kPa, the temperature at the top of the tower is 100°C, the temperature at the bottom of the tower is 170°C, and the reflux ratio It is 0.5: 1, and the high-boiling point heavy aromatics cut E with higher boiling point than naphthalene is discharged from the bottom of the tower, and the mixed cut mainly containing xylene, trimethylbenzene, indane, tetrali...

Embodiment 3

[0035] The material composition of the heavy component raffinate of the coking crude benzene hydrogenation process in a factory is shown in Table 1, and its separation steps:

[0036] ① Add the heavy component raffinate produced by the coking crude benzene hydrogenation process to the weight removal tower 1 at a flow rate of 6250kg / h. The operating pressure at the top of the weight removal tower 1 is 20kPa, the temperature at the top of the tower is 110°C, and the temperature at the bottom of the tower is 180 ℃, the reflux ratio is 1.5: 1, the high-boiling heavy aromatics fraction E with a higher boiling point than naphthalene is discharged from the bottom of the tower, and the mixed fraction mainly containing xylene, trimethylbenzene, indane and tetralin is obtained from the top of the tower;

[0037] ② Step ① The mixed fraction obtained at the top of the tower is sent from the middle to the light removal tower 2, the operating pressure at the top of the light removal tower 2 ...

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Abstract

The invention discloses a device and a method for reclaiming and separating heavy component residue of a coked crude benzene hydrogenation process, and belongs to the technical field of rectification separation. The reclaiming device comprises a heavy component removal tower, a light component removal tower, a trimethyl benzene tower, an indane tower and a tetrahydronaphthalene tower connected sequentially; the bottom of each tower is communicated with a re-boiler, the top of each tower is communicated with a condenser, and the condenser is communicated with a vacuum system; the heavy component residue of the coked crude benzene hydrogenation process is continuously rectified and separated through the heavy component removal tower, the light component removal tower, the trimethyl benzene tower, the indane tower and the tetrahydronaphthalene tower in sequence, and trimethyl benzene, indane, tetrahydronaphthalene and naphthalene are obtained and respectively have purity of over 98.0 weight percent, 99.5 weight percent, 99.7 weight percent and 99.0 weight percent. The process has the advantages of reasonable flow, high reclaiming rate, low operating temperature, low process energy consumption, high product quality and the like, and is an efficient and feasible process for reclaiming and separating the heavy component residue of the coked crude benzene hydrogenation process.

Description

technical field [0001] The invention relates to the technical field of rectification, separation and purification, in particular to a recovery device and a separation method for heavy component raffinate produced in a coking crude benzene hydrogenation process. Background technique [0002] Benzene, toluene, and xylene are valuable basic organic chemical raw materials, and their demand and consumption are increasing in recent years. At present, with the emergence of the oil crisis, the shortage of benzene raw materials in the country is even greater. Due to my country's rich coal resources, coke production ranks first in the world, and currently obtaining pure benzene from coking crude benzene, a by-product of the coal coking industry, has become an important way to obtain pure benzene products. [0003] Coking crude benzene is mainly refined by pickling and hydrofining processes. The pickling method has the characteristics of simple process, less investment and flexible op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C15/08C07C15/02C07C13/465C07C13/48C07C15/24
Inventor 张英伟华超杨洪庆夏淑倩耿瑞增高忠超罗帅许东辉陈思
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