Coal tar heavy fraction fluidized-bed hydrocracking method and system thereof

A hydrocracking and heavy fraction technology, applied in the field of coal chemical industry, can solve the problems of catalyst activity greatly affected, catalyst activity reduction, catalyst bed clogging, etc., achieve high catalyst utilization rate, high conversion rate, and solve bed clogging Effect

Inactive Publication Date: 2011-02-02
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This production method is actually a combined process of fixed bed and ebullating bed. However, due to the high impurity content in tar, and the reaction is easy to coke under high temperature conditions, the catalyst bed is seriously blocked. To maintain long-term operation, the catalyst needs to be replaced frequently. A large amount of catalyst is used, which increases the cost and complicates the process
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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  • Coal tar heavy fraction fluidized-bed hydrocracking method and system thereof
  • Coal tar heavy fraction fluidized-bed hydrocracking method and system thereof
  • Coal tar heavy fraction fluidized-bed hydrocracking method and system thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0023] The above coal tar heavy fraction ebullating bed hydrocracking system is used to mix high-pressure hydrogen 1 and circulating hydrogen 6, coal tar heavy fraction 2 and circulating tail oil 14, and the mixed hydrogen and mixed oil are produced by ebullating bed reactor 3 The bottom enters, the catalyst 4 enters from the top of the ebullated bed reactor 3, and the reaction product output from the top of the ebullated bed reactor 3 enters the high-pressure separator 5, and the circulating hydrogen 6 separated by the high-pressure separator 5 returns through the circulating hydrogen compressor 7 The ebullated bed reactor 3 is recycled. The separated liquid phase product oil is sent to fractionation tower 11 for separation, and its product is gaseous hydrocarbon 8 (C 1 ~C 4 ), gasoline fraction 9 (C 5 ~170°C fraction), 10 diesel fractions (170~350°C fraction), 12 tail oils (greater than 350°C). A part of the tail oil is returned to the ebullated bed reactor 3 for recyclin...

Embodiment 5～8

[0028] The method and system for ebullating bed hydrocracking of the heavy fraction of coal tar mentioned above are adopted, and the test method and process are the same as those of the above-mentioned Examples 1-4.

[0029] In the test, the addition amount of 4 kinds of heavy fractions of coal tar is 15kg / h, and the supported catalyst used is a strip-shaped molybdenum-nickel catalyst with silicon oxide as the carrier, and the molybdenum content in the catalyst is 10% (according to MoO 3 Calculation), the nickel content is 6% (calculated as NiO), and the bulk density of the catalyst is 0.7g / cm 3 , the specific surface area is 200m 2 / g, the pore volume is 0.50mL / g, and the catalyst particle diameter is 0.20mm. The reaction conditions and results of the ebullating bed hydrocracking test are shown in Table 3.

[0030] Table 3 Reaction conditions and results of fluidized bed hydrocracking test

[0031]

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Abstract

The invention relates to the field of coal chemical industry, in particular to a coal tar heavy fraction fluidized-bed hydrocracking method. The method comprises the following steps: the raw materials of coal tar heavy fractions are mixed with hydrogen and then enter a fluidized-bed reactor from the bottom thereof, and a supported catalyst enters the fluidized-bed reactor from the top thereof; under the action of the supported catalyst, the coal tar heavy fractions and the hydrogen carry out hydrocracking reaction in the fluidized-bed reactor; and the obtained reaction product is delivered from the top of the fluidized-bed reactor and then subject to gas-liquid separation, the separated hydrogen returns to the fluidized-bed reactor to be recycled, and the separated liquid product is subject to distillation separation to obtain gaseous hydrocarbon, gasoline fractions, diesel fractions and tail oil. In the invention, by directly adopting the fluidized-bed hydrocracking method, the coal tar heavy fractions can keep light weight, the yield of the fuel oil product hydrogenated by coal tar can be effectively increased, and blockage phenomenon of a catalyst bed layer can be effectively eliminated; and the method of the invention has the characteristics of simple and reasonable process, long-term operation, a small amount of the catalyst adopted, low cost, high yield of the oil generated by the product and good quality.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and in particular relates to a method and system for ebullating bed hydrocracking of heavy fractions of coal tar. Background technique [0002] In the process of petroleum processing, fluidized bed hydrocracking is one of the main methods to lighten various inferior heavy oils and residual oils. In order to meet the rapid growth of market demand for light fuel oil, more than 20 sets of heavy oil and residual oil fluidized bed hydrocracking units have been put into industrial production in various countries. Ebullating bed hydrocracking technology has the remarkable characteristics of wide adaptability to high viscosity, high carbon residue, high bitumen, high metal residue, uniform temperature in the reactor, high catalyst utilization rate, long operation period and flexible operation of the unit. Ebullating bed hydrocracking technology has become one of the main development direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02
Inventor 张秋民马宝岐关珺何德民
Owner DALIAN UNIV OF TECH
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