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Method for grading catalysts during hydrogenation of medium-low-temperature coal tar

A hydrogenation process and catalyst technology, which is applied in the field of coal chemical industry, can solve the problems of unsatisfactory catalyst strength, heavy maintenance workload, and poor activity effect, and achieve the problems of increasing the active specific surface, solving back-mixing, and weakening the interaction Effect

Inactive Publication Date: 2015-10-14
JIANGSU HUDA CHEM TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, many reactors are involved, the cost is high, and the maintenance workload is heavy
In addition, there are some studies on hydrofining and cracking catalyst gradation methods for coal tar purification. Although they have high conversion rates, the strength of the catalyst is not ideal and the activity effect is relatively poor. The refined preparation of this scheme can only 1.5 years of operation, 1.0 years of cracking agent

Method used

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  • Method for grading catalysts during hydrogenation of medium-low-temperature coal tar
  • Method for grading catalysts during hydrogenation of medium-low-temperature coal tar
  • Method for grading catalysts during hydrogenation of medium-low-temperature coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 Catalyst gradation specific scheme in the middle and low temperature coal tar hydrogenation process

[0042] Mix medium-temperature coal tar, low-temperature coal tar, medium-low temperature coal tar, and shale oil at a weight ratio of 5:7:3:2, and the performance indicators of the raw material oil after mixing are shown in Table 1.

[0043] Table 1

[0044]

[0045]

[0046] The hydrogenation process is as follows: the raw oil and hydrogen are mixed and then enter the No. 1 protection reactor, the No. 2 refining reactor, the No. 3 upgrading reactor, and the high-low separation system to complete the hydrofining stage; the separated liquid enters the fractionation system, The resulting tail oil then enters No. 4 refining reactor, No. 5 cracking reactor, and high-low separation system to complete the hydrocracking stage to obtain light fuel oil;

[0047] Wherein, the loading ratios of the beds and catalysts in the No. 1 protection reactor are as follo...

experiment example 2

[0065] According to the method loading catalyst of embodiment 1, difference is:

[0066] The loading ratios of the beds and catalysts in the No. 1 protection reactor are as follows: the first bed is filled with 55V% demetallization agent, the second bed is filled with 25V% ZDL-T1 agent, and the third bed is filled with 20V% ZDL - T2 agent;

[0067] Each bed of described No. 2 refining reactor and the catalyst loading ratio are: the first bed is filled with 18V% ZDL-J1 agent, the second bed is filled with 17V% ZDL-J1 agent and 19V% ZDL-J2 agent, The third bed layer is filled with 46V% ZDL-J2 agent;

[0068] The loading ratios of the beds and catalysts in the No. 3 reforming reactor are as follows: the first bed is filled with 22V% of the ZDL-G1 agent, the second bed is filled with 19V% of the ZDL-G1 agent and 23V% of the ZDL-G2 agent , the third bed layer is filled with 36V% ZDL-G2 agent;

[0069] The loading ratios of the beds and catalysts in the No. 4 refining reactor are...

experiment example 3

[0075] According to the method loading catalyst of embodiment 1, difference is:

[0076] The loading ratios of the beds and catalysts in the No. 1 protection reactor are as follows: the first bed is filled with 65V% demetallization agent, the second bed is filled with 20V% ZDL-T1 agent, and the third bed is filled with 15V% ZDL - T2 agent;

[0077] The loading ratios of the beds and catalysts in the No. 2 refining reactor are as follows: the first bed is filled with 15V% ZDL-J1 agent, the second bed is filled with 20V% ZDL-J1 agent and 21V% ZDL-J2 agent, The third bed layer is filled with 44V% ZDL-J2 agent;

[0078] The loading ratios of the beds and catalysts in the No. 3 upgrading reactor are as follows: the first bed is filled with 20V% of the ZDL-G1 agent, the second bed is filled with 21V% of the ZDL-G1 agent and 18V% of the ZDL-G2 agent , the third bed layer is filled with 41V% ZDL-G2 agent;

[0079] The loading ratios of the beds and catalysts in the No. 4 refining r...

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Abstract

The invention relates to a method for grading catalysts during hydrogenation of medium-low-temperature coal tar. A hydrogenation process comprises the following steps: mixing raw coal tar and hydrogen, and allowing the mixture to enter a No.1 protection reactor, a No.2 refining reactor, a No.3 modification reactor and a high-low separation system in sequence to finish a hydrogenation refining stage; allowing the separated liquid to enter a fractionating system, and allowing the obtained tail coal tar to enter a No.4 refining reactor, a No.5 cracking reactor and the high-low separation system to finish a hydrogenation and cracking stage and obtain a light fuel. Through optimization of a combination mode of the catalysts, the activity of the catalysts is further improved, and the service life of the catalysts and the operation cycle of devices are prolonged on the premise of ensuring the quality of the fuel product.

Description

technical field [0001] The invention relates to a catalyst gradation method in a medium-low temperature coal tar hydrogenation process, belonging to the technical field of coal chemical industry. Background technique [0002] Coal tar is a kind of low-quality oil produced in the process of coal dry distillation. Its components are complex and contain a large number of heteroatoms. Currently, the best way to utilize coal tar is to refine it, and the hydrogenated oil is used as feed for hydrocracking. In the refining process, in order to achieve the refining effect, it is necessary to combine catalysts with different functions. The appropriate gradation ratio of different catalysts is not only the guarantee of the quality of the target product, but also can maximize the characteristics and functions of each catalyst. Therefore, the study of catalyst gradation is of great significance in the refining process of coal tar. [0003] The existing research results provide a varie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
Inventor 张婉秋沈彦梅林立兵
Owner JIANGSU HUDA CHEM TECH CO LTD
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