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A kind of hydrocracking method of coal tar

A hydrocracking and coal tar technology, which is applied in chemical instruments and methods, hydroprocessing technology, and hydrocarbon oil treatment, can solve the problems of low yield of cracked light oil, poor catalyst activity, and short catalyst life. The effect of high proportion of mesopores, lower coke yield, and better pore size distribution range

Active Publication Date: 2019-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared by this method has poor activity, more coking in the reaction, low yield of cracked light oil, and the single-pass conversion rate of coal tar pitch reaches about 35%. The conversion rate of coal tar pitch needs to be further improved, and the catalyst life is short

Method used

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  • A kind of hydrocracking method of coal tar
  • A kind of hydrocracking method of coal tar
  • A kind of hydrocracking method of coal tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Take 278g of NaY raw powder and put it into 800mL of clean water, raise the temperature to 95°C, and start to add dropwise (NH 4 ) 2 SiF 6 Aqueous solution, 307mL solution concentration is 72g / L (NH 4 ) 2 SiF 6 solution, stirring at constant temperature for 2 hours after the dropwise addition, filtering and drying after the completion of the constant temperature, the dry basis of the dried molecular sieve is 65.3wt%; the above-mentioned dried molecular sieve is added to the hydrothermal treatment device, under gauge pressure 0.25MPa, temperature Under the conditions of 610°C and treatment time of 1.0 hour, carry out hydrothermal treatment on molecular sieve; take 130g of molecular sieve after hydrothermal treatment and put it into 520mL aqueous solution of tetraethylammonium hydroxide with a mass concentration of 5.3%, and stir at constant temperature at 80°C for 4 hours , and then transfer the mixed material to a crystallization tank for hydrothermal crystallizatio...

Embodiment 2

[0057] Take 278g of NaY raw powder and put it into 800mL of clean water, raise the temperature to 100°C, and start to add dropwise (NH 4 ) 2 SiF 6 Aqueous solution, 182mL solution concentration is 55g / L (NH 4 ) 2 SiF 6 solution, stirring at constant temperature for 2 hours after the dropwise addition, filtering and drying after the completion of the constant temperature, the dry basis of the dried molecular sieve is 68.0wt%; the above-mentioned dried molecular sieve is added to the hydrothermal treatment device, under gauge pressure 0.30MPa, temperature Under the conditions of 670°C and treatment time of 2.0 hours, the molecular sieve was hydrothermally treated; 130g of the hydrothermally treated molecular sieve was put into 910mL of tetrapropylammonium hydroxide aqueous solution with a mass concentration of 7.5%, and stirred at 90°C for 4 hours , and then transfer the mixed material to a crystallization kettle for hydrothermal crystallization, the crystallization temperat...

Embodiment 3

[0059] Take 278g of NaY raw powder and put it into 1000mL of clean water, raise the temperature to 100°C, and start to add dropwise (NH 4 ) 2 SiF 6 Aqueous solution, 417mL solution concentration is 85g / L (NH 4 ) 2 SiF 6 solution, stirring at constant temperature for 3 hours after the dropwise addition, filtering and drying after the completion of the constant temperature, the dry basis of the dried molecular sieve is 67.2wt%; the above-mentioned dried molecular sieve is added to the hydrothermal treatment device, under gauge pressure 0.35MPa, temperature Under the conditions of 700°C and treatment time of 3.0 hours, the molecular sieve was hydrothermally treated; 130g of the hydrothermally treated molecular sieve was put into 1040mL of tetraethylammonium hydroxide aqueous solution with a mass concentration of 3.5%, and stirred at a constant temperature of 85°C for 3 hours , and then transfer the mixed material to a crystallization tank for hydrothermal crystallization, the...

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Abstract

The invention discloses a hydrocracking method for coal tar. The method comprises the steps of carrying out hydrorefining on coal tar feedstock, then, subjecting the coal tar feedstock and a hydrocracking catalyst to contact, carrying out a hydrocracking reaction, and subjecting the obtained hydrocracking product to separation, thereby obtaining a gasoline fraction and a diesel fuel fraction, wherein modified Y molecular sieves serve as the hydrocracking catalyst and have the following properties: the relative crystallinity is 110% to 150%, the SiO2 / Al2O3 mole ratio is 55 to 100, the unit cell parameter is 2.425nm to 2.435nm, the total pore volume is 0.55mL / g to 1.0mL / g, and the pore volume of mesopores accounts for 70% or more of the total pore volume. The method can be used for effectively converting a polycyclic aromatic hydrocarbon heavy component in the coal tar to produce traffic transportation fuel blending components with higher quality.

Description

technical field [0001] The invention relates to a coal tar hydrocracking method, in particular to a hydrocracking method for converting coal tar fractions into clean gasoline and diesel oil. 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 more importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G65/12B01J29/16
CPCB01J29/166B01J2229/16B01J2229/18B01J2229/32B01J2229/40C10G65/12C10G2400/02C10G2400/04
Inventor 刘昶王凤来关明华杜艳泽黄薇赵红郝文月曹均丰
Owner CHINA PETROLEUM & CHEM CORP
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