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Method for hydrogenation of coal tar via fluidized bed

A fluidized bed and coal tar technology, applied in the field of coal tar hydrogenation, can solve the problems of high impurity content of coal tar, increased cost, complicated process, etc.

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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  • Method for hydrogenation of coal tar via fluidized bed
  • Method for hydrogenation of coal tar via fluidized bed
  • Method for hydrogenation of coal tar via fluidized bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Catalyst preparation

[0059] 1. Preparation of a reverse hydrogenation catalyst I-1

[0060] Weigh 1000g of ferric oxyhydroxide filter cake prepared by wet air oxidation, which contains 400g of ferric oxyhydroxide, add 130g of citric acid dissolved in 1L of water to it and stir to make it evenly mixed, the modification treatment time is 0.5h, and the treated slurry stand-by.

[0061] Preparation of sodium metaaluminate solution concentration is 50gAl 2 o 3 / L, a total of 1L, heated to 80°C for use, the concentration of aluminum sulfate solution is 20gAl 2 o 3 / L, a total of 2L, heated to 80°C for use.

[0062] Add 1.0L of distilled water into the gel tank and heat to 80°C. Weigh 450g (macroporous alumina specific surface area 162m 2 / g, pore volume 0.84mL / g, average pore diameter 21nm) and 150g Y-type molecular sieve (SiO 2 / Al 2 o 3 =12.0), add it into the gelling tank and stir evenly, and then add sodium metaaluminate solution and aluminum sulfate solution,...

Embodiment 2

[0087] Catalysts I-1, I-2, I-3 and II-1, II-2 were evaluated on the continuous stirring autoclave (CSTR) in series, each reactor was filled with 100mL of catalyst, and medium and low temperature coal was selected for evaluation Tar is the raw material oil, 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.

[0088] Table 2 Raw Oil Properties

[0089]

[0090] Table 3 Evaluation Process Conditions

[0091]

[0092] Table 3 continued

[0093]

[0094] Analysis Project T-1 T-2 T-3 T-4 T-5 T-6 T-7 Yield, wt% 21.6 22 22.8 23.3 23.1 22.6 22.2 Density (20℃), kg / m 3 0.7535 0.7524 0.7520 0.7501 0.7511 0.7509 0.7528 Sulfur, μg / g 11 9.7 8.9 7.2 7.7 8.1 9 Research octane number RON 84.8 85.9 86.7 88.3 87.2 87.9 86.9 Distillation range, ℃ initial boiling point 97 94 90 83 85 85 ...

Embodiment 3

[0100] 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 method for hydrogenation of coal tar via a fluidized bed. The method comprises the following steps: subjecting a coal tar raw material to hydro-upgrading; carrying out separation to remove water; and then carrying out hydrorefining and fractionation so as to obtain a gasoline fraction, a diesel fraction and hydrogenation tail oil. A hydro-upgrading catalyst used in the method comprises iron oxyhydroxide, organic polybasic carboxylic acid, macroporous alumina, a molecular sieve and pseudo-boehmite; and a hydrofining catalyst used in the method comprises iron oxyhydroxide, organic polybasic carboxylic acid, macroporous alumina and a binder. The method provided by the invention adopts cheap iron oxyhydroxide as an active metal component, the hydro-upgrading catalyst and the hydro-refining catalyst are graded, so cost is low. According to the invention, moderate cracking of coal tar is carried out before refining of coal tar, so impurities in coal tar are effectively removed, product distribution and product quality are adjusted, and the running period of a device is prolonged.

Description

Technical field [0001] The present invention involves a method of coal coking oil hydrogen, which is particularly suitable for the hydrogenation process of boiling beds for coal tar. Background technique [0002] Coal tar is an important by -product in the process of coal thermal dissolving and dry distillation process. It is a complex mixture of a variety of substances. Depending on the coal thermal dissolving dry distillation temperature and process method, coal tar can be divided into low -temperature coal tar and high -temperature coal tar. [0003] Compared with petroleum distillation points, coal tar ingredients have high content of sulfur, nitrogen and other miscellaneous atoms, high gray scores, high polygon aromatic hydrocarbons, high glue and asphalt content.Therefore, direct combustion will produce a large amount of sulfide and nitride, causing severe environmental pollution.The cleaning and effective use of coal scorch oil became more important.The hydrogenation proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/12
CPCC10G67/14C10G2300/70C10G2400/02C10G2400/04
Inventor 刘杰朱慧红孙素华金浩杨光彭绍忠蒋立敬
Owner CHINA PETROLEUM & CHEM CORP
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