Combined process of hydrotreatment and delayed coking for residual oil

A technology of delayed coking and hydrotreating, which is applied in the fields of hydrotreating process, petroleum industry, and hydrocarbon oil treatment, etc. It can solve the problems of reducing the processing capacity of the unit and low thermal cracking temperature, so as to reduce the processing load, delay the tendency of coking, The effect of reducing foam generation

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires an additional heating furnace and a reactor. Since the reactor is not a coking tower, the thermal cracking temperature used is relatively low, and part of the unconverted coking gas oil is returned to the coking system, which reduces the processing capacity of the device accordingly.

Method used

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  • Combined process of hydrotreatment and delayed coking for residual oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, vacuum residue, 10% by weight coker gas oil (accounting for vacuum residue) and hydrogen are mixed together, and enter the residue hydrogenation unit for reaction in the presence of a catalyst, and the hydrogenation reaction product is separated to obtain the generated gas , naphtha, diesel oil, hydrogenated tail oil (including hydrogenated vacuum gas oil and hydrogenated vacuum residue, both of which enter the coking tower evenly in the same proportion), separate the coking products to obtain coking dry gas, coking gasoline, Coker diesel, coker gas oil and needle coke, where coker gas oil is recycled to hydrotreating unit. Operating conditions, material balance and properties of some products are shown in Table 2, Table 3 and Table 4, respectively.

[0034] It can be seen from Table 3 and Table 4 that the yield of hydrogenated tail oil (greater than 350°C) obtained after hydrotreating is 86.8% by weight; the yield of coked gasoline and coked diesel oil...

Embodiment 2

[0036] In this example, vacuum residue, 30% by weight coker gas oil (accounting for vacuum residue) and hydrogen are mixed together, and enter the residue hydrogenation unit for reaction in the presence of a catalyst, and the hydrogenation reaction product is separated to obtain the generated gas , naphtha, diesel oil, hydrogenated tail oil (including hydrogenated vacuum gas oil and hydrogenated vacuum residue, both of which enter the coking tower evenly in the same proportion), separate the coking products to obtain coking dry gas, coking gasoline, Coker diesel, coker gas oil and needle coke, where coker gas oil is recycled to hydrotreating unit. Operating conditions, material balance and properties of some products are shown in Table 2, Table 3 and Table 4, respectively.

[0037] It can be seen from Table 1 that the viscosity of the vacuum residue raw material after adding coking gas oil is significantly reduced, and the viscosity at 100°C is from nearly 1285mm 2 / s down to...

Embodiment 3

[0047] According to the method described in Example 1, the hydrogenated vacuum gas oil is injected into 80% of the total feed of the hydrogenated vacuum gas oil in the entire feed cycle in the first 40% of the coking tower feed cycle. The results show that the circulation of coking gas oil can be reduced by about 20% in the whole cycle, indicating that the single-pass cracking rate of hydrotreated vacuum gas oil in the coking tower is improved.

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Abstract

The invention discloses a combined process of hydrotreatment and delayed coking for residual oil. According to the invention, residual oil, coker gas oil and hydrogen are mixed together, and an obtained mixture enters into a hydrotreatment unit in the presence of a catalyst; a reaction product of hydrotreatment is separated; residual oil having undergone hydrotreatment is mixed with separated pressure-reduced gas oil or with other conventional raw materials, and an obtained mixture enters into a delayed coking unit; a coking product is separated, and coked gas oil therein is totally recycled to a residual oil hydrogenation unit. With the combined process, a product structure is improved, a coked gas oil product is not generated, a light oil product can be maximumly produced, high-quality needle coke can be obtained, generation of foam in a coking tower can be effectively reduced, and the coking tendency of a coking furnace is delayed.

Description

technical field [0001] The invention relates to a combined process of residual oil hydrogenation treatment process and a delayed coking process for treating hydrocarbon oil, which can improve the distribution structure of delayed coking products. Background technique [0002] Delayed coking has the characteristics of low investment and operating costs, strong adaptability to different raw materials, and mature technology. Delayed coking is still one of the most important processing methods for the lightening of residual oil, and has been widely valued by people. At present, a lot of research and industrial application work have been done on improving the liquid yield of the delayed coking process and reducing the ordinary coke yield at home and abroad. The main work is to increase the liquid product yield by reducing the cycle ratio of the coking unit operation. The main problem is that the part of the liquid product yield increase is mainly the increase of the heavy gas oil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G69/06
Inventor 孙国权王鑫刘纾言赵起超李殿昭
Owner CHINA PETROLEUM & CHEM CORP
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