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Hydrocracking method

A hydrocracking and hydrofining technology, which is applied in the fields of hydrotreating process, petroleum industry, hydrocarbon oil treatment products, etc., can solve the problems of complex operation of the unit, high yield of light hydrocarbons, complex operation, etc.

Active Publication Date: 2019-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] CN200610008417.8 discloses a hydrocracking method for circulating middle distillate oil. In this method, after mixing inferior catalytic fuel and heavy hydrocracking raw material, hydrocracking is first carried out, and the obtained middle distillate oil is subjected to two-stage hydrocracking. Obtain high aromatic potential heavy naphtha and tail oil with low BMCI value. This method requires high equipment investment, complicated operation, and high yield of light hydrocarbons with low added value.
[0009] CN201210440422.1 discloses a combined hydrogenation method of hydrocracking and hydrodearomatization, in which inferior diesel fuel and hydrogen are hydrorefined in a gas-liquid countercurrent manner; the refined oil is hydrogenated in the presence of a precious metal catalyst Dearomatization reaction; wax oil and hydrogen are subjected to hydrocracking pretreatment reaction, and hydrocracking pretreatment effluent is mixed with hydrodearomatization effluent to undergo hydrocracking reaction; hydrocracking effluent is separated and fractionated to obtain Different distillate products; the cracked tail oil is recycled to the hydrodearomatization reactor. Although this method can solve the problem of limited catalytic diesel processing capacity, it can also greatly increase the yield of light oil and improve product quality, but the investment in equipment is high , the operation of the device is complex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Take 200 g of the original NaY molecular sieve powder prepared in the laboratory, mix it with ammonium chloride with a concentration of 2.5 mol / L according to the liquid-solid ratio of 5:1, and exchange it at 85 °C for 2 hours. Repeat this process twice. The Na content in the molecular sieve is expressed as Na 2 O is calculated as 1.3%;

[0043] (2) Hydrothermal treatment of the Y molecular sieve obtained in step (1) at 530°C and 0.15Mpa for 1.5 hours;

[0044] (3) The Y molecular sieve obtained in step (2) was mixed with sodium nitrate with a concentration of 1.5 mol / L according to a liquid-solid ratio of 5:1, exchanged at 80 °C for 1 hour, and this process was repeated twice. The content is 3.6% as Na2O;

[0045] (4) The molecular sieve obtained in step (3) is mixed and beaten with ammonium fluorosilicate solution with a concentration of 0.5mol / L according to the liquid-solid ratio of 5:1, and treated at 95°C for 2 hours;

[0046] (5) The Y molecular sieve trea...

Embodiment 2

[0052] (1) Take 200 g of the original NaY molecular sieve powder prepared in the laboratory, mix with ammonium nitrate with a concentration of 1.6 mol / L according to the liquid-solid ratio of 3:1, exchange at 80 °C for 2 hours, repeat this process twice, the Y molecular sieve after exchange Na content in Na 2 O counts as 2.0%;

[0053] (2) Hydrothermal treatment of the Y molecular sieve obtained in step (1) at 550°C and 0.2MPa for 2 hours;

[0054] (3) The Y molecular sieve obtained in step (2) was mixed with a mixed solution containing sodium nitrate and glycerol at a ratio of 3.0 mol / L and 0.2 mol / L, respectively, according to a liquid-solid ratio of 5:1, exchanged at 80 °C for 1 hour, and repeated. This process is performed twice, and the Na content in the Y molecular sieve after exchange is equal to Na 2 O is calculated as 5.3%;

[0055] (4) The molecular sieve obtained in step (3) is mixed and beaten with an ammonium fluorosilicate solution with a concentration of 0.7 ...

Embodiment 3

[0062] With embodiment 1, just after obtaining Y-2, carry out following treatment: under stirring condition, Y molecular sieve and tetrapropyl ammonium hydroxide solution are mixed in autoclave, feed nitrogen to control system pressure at 0.4 MPa, then heat up to 70°C, continue stirring at constant temperature for 1 hour, release the pressure, cool, suction filter to pH less than 9, dry at 125°C for 12 hours, and calcinate at 500°C for 3 hours to obtain modified Y molecular sieves. The concentration of tetrapropylammonium hydroxide solution is 0.12mol / L, and the mass ratio of Y molecular sieve to water in the solution is 1:9.

[0063] Table 1 Main physicochemical properties of hydrocracking catalysts.

[0064]

[0065] Example 3

[0066] Using straight-run diesel as raw material, the upper bed of hydrocracking reactor is filled with catalyst , the lower bed is filled with catalyst , the catalyst loading volume ratio is 1:1.

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Abstract

The invention discloses a hydrocracking method, which comprises the following steps: (1) a diesel oil feedstock is mixed with hydrogen gas and then enters a hydrorefining reactor to carry out desulfurization, denitrification and aromatic saturation reaction; (2) the effluent from step (1) enters a hydrocracking reactor, wherein the hydrocracking reactor comprises at least two catalyst beds, wherein the molecular sieve content of the hydrocracking catalyst containing the modified Y molecular sieve in each catalyst bed increases progressively along the flow direction, and the average pore diameter of the catalyst decreases progressively; (3) the effluent of the hydrocracking reactor is separated into a gas phase and a liquid phase, the gas phase is recycled, the liquid phase enters a fractionation tower, and the fractionating products are obtained and comprise naphtha, aviation fuel, diesel oil and tail oil. The method takes diesel oil as a feedstock and increases the production of high-aromatic latent heavy naphtha through reasonable combination of different functional hydrocracking catalysts, thereby improving the quality of aviation fuel and diesel oil products.

Description

technical field [0001] The invention relates to a hydrocracking method, in particular to a hydrocracking method for producing high-quality clean fuel by using diesel oil as raw material, especially straight-run diesel oil. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability of raw materials, great flexibility in production operation and product scheme, and good product quality. As well as chemical naphtha and tail oil steam cracking to produce ethylene raw materials, it has become one of the most important heavy oil deep processing technologies in modern oil refining and petrochemical industries, and has been widely used at home and abroad. With the reduction of the current diesel market demand in my country, the reduction of diesel yield and the increase in the production of chemical raw materials have become an important means for refining and chemical enterprises to improve economic benefits. [0003] CN200610008413.X dis...

Claims

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Application Information

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IPC IPC(8): C10G67/02
CPCC10G67/02C10G2300/1048C10G2300/1055C10G2300/1059C10G2400/04
Inventor 崔哲杜艳泽吴子明王仲义孙士可彭冲曹正凯
Owner CHINA PETROLEUM & CHEM CORP
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