Hydrogenation method of coal tar

A technology for coal tar and hydro-upgrading, which is applied in hydrotreating process, petroleum industry, processing of hydrocarbon oil, etc., can solve the problems of great influence on catalyst activity, high impurity content of coal tar, blockage of catalyst bed, etc. The effect of improving product distribution and product properties, extending operating cycle, and suitable cracking activity

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is actually switching the fixed bed process to carry out hydrofining of coal tar raw materials. However, due to the high impurity content in coal tar, and the reaction is easy to coke under high temperature conditions, resulting in serious blockage of the catalyst bed, it is necessary to maintain long-term operation. The catalyst needs to be replaced frequently, the amount of catalyst is large, the cost is increased, and the process is complicated
In addition, the product from the switching reactor contains a considerable amount of water, which directly enters the hydrogenation reactor without treatment, which has a great impact on the activity of the catalyst (especially the catalyst containing molecular sieves), which will greatly reduce the activity of the catalyst

Method used

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  • Hydrogenation method of coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Catalyst preparation

[0053] 1. Preparation of a reverse hydrogenation catalyst I-1

[0054] Weigh 1000g of ferric oxyhydroxide filter cake prepared by wet air oxidation method, which contains 400g of ferric oxyhydroxide, add 80g of citric acid dissolved in 1L of water to it and stir to make it evenly mixed, the modification treatment time is 1h, and the treated slurry is use.

[0055] Preparation of sodium metaaluminate solution concentration is 50gAl 2 o 3 / L, a total of 1L, heated to 75°C for use, the concentration of aluminum sulfate solution is 20gAl 2 o 3 / L for a total of 2L, heated to 75°C for use.

[0056] Add 1.0L of distilled water into the gel tank and heat to 75°C. Weigh 500g (the specific surface area of ​​macroporous alumina is 220m 2 / g, pore volume 0.92mL / g, average pore diameter 17nm) and 100g Y-type molecular sieve (SiO 2 / Al 2 o 3 =11.5), add it into the gelling tank and stir evenly, and then add sodium metaaluminate solution and aluminum ...

Embodiment 2

[0078] Catalysts I-1, I-2, I-3 and II-1 were evaluated on the activity of continuous stirring autoclaves (CSTR) in series, each reactor was loaded with 100mL of catalyst, and medium and low temperature coal tar was selected as the raw material oil for evaluation , its properties are shown in Table 2, the process conditions are shown in Table 3, and the evaluation results are shown in Table 4, Table 5 and Table 6.

[0079] Table 2 Raw Oil Properties

[0080]

[0081] Table 3 Evaluation Process Conditions

[0082]

[0083] Table 3 continued

[0084]

[0085] Table 4 gasoline fraction properties (C 5 -180°C)

[0086]

[0087] Table 4 continued

[0088]

[0089] Table 5 Properties of diesel fractions (180-350°C)

[0090]

[0091] Table 5 continued

[0092]

[0093] Table 6 Hydrogenation Tail Oil Properties (>350°C)

[0094]

[0095] Table 6 continued

[0096]

[0097] From the above evaluation results, it can be seen that after coal tar is hydrot...

Embodiment 3

[0099] Select catalyst I-1 / II-1 in series, at a reaction temperature of 370°C, a reaction pressure of 15MPa and a space velocity of 0.5h -1 Under the condition of normal operation for 1000h, the S in the hydrogenation tail oil was sampled and analyzed at different times, and the hydrogenation activity of the catalyst at different times was obtained. figure 2 .

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Abstract

The invention discloses a hydrogenation method of coal tar. The method includes performing hydrogenation modification of the coal tar raw material, separating to remove water, and performing hydrofining and fractionation to obtain a gasoline fraction, a diesel oil fraction and a hydrogenation tail oil, wherein a catalyst applied in the hydrogenation modification process comprises ferric oxyhydroxide, organic polybasic carboxylic acid, macroporous alumina, molecular sieve and pseudo-boehmite. The inventive method adopting the hydrogenation modification catalyst with the low-cost ferric oxyhydroxide as an active metal component has low cost, and can realize moderate cracking and refining of the coal tar, effectively remove impurities in the coal tar, adjust product distribution and properties, and extend running cycle of a device.

Description

technical field [0001] The invention relates to a coal tar hydrogenation catalyst and a preparation method thereof, which is particularly suitable for the fluidized bed hydrocracking process of coal tar. Background technique [0002] Coal tar is an important by-product of coal pyrolysis and carbonization process. It is a complex mixture of various substances. According to the temperature and process method of coal pyrolysis and carbonization, coal tar can be divided into low-temperature coal tar and high-temperature coal tar. [0003] Compared with petroleum heavy fractions, coal tar raw materials have the characteristics of high content of heteroatoms such as sulfur and nitrogen, high ash content, high content of polycyclic aromatic hydrocarbons, and high content of colloids and asphaltenes. Therefore, direct combustion will produce a large amount of sulfide and nitride, causing serious environmental pollution. Clean processing and effective utilization of coal tar become...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/02
CPCC10G65/02C10G2300/202C10G2300/70
Inventor 朱慧红孙素华刘杰金浩杨光彭绍忠蒋立敬
Owner CHINA PETROLEUM & CHEM CORP
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