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A kind of hydrocracking method

A hydrocracking and hydrofining technology, which is applied in the fields of hydrotreating process, hydrocarbon oil treatment products, hydrocarbon oil treatment, etc., can solve the problems of complex operation, high equipment investment, and complex operation of the device

Active Publication Date: 2020-09-11
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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  • A kind of hydrocracking method
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  • A kind of hydrocracking method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

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

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

[0046] (5) The Y molecu...

Embodiment 2

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

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

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

[0055] (4) The molecular sieve obtained in step (3) is mixed with ammonium fluorosilicate solution with a concentration of 0.7mol / L according to the liquid-solid ratio of 10:1 and b...

Embodiment 3

[0062] Same as Example 1, except that after obtaining Y-2, the following treatment is carried out: under stirring conditions, Y molecular sieve and tetrapropyl ammonium hydroxide solution are mixed in a high-pressure reactor, and nitrogen gas is introduced to control the system pressure at 0.4 MPa, then raise the temperature to 70°C, continue stirring at constant temperature for 1 hour, release the pressure, cool, filter with suction until the pH value is less than 9, dry at 125°C for 12 hours, and calcinate at 500°C for 3 hours to obtain a modified Y molecular sieve. The concentration of the 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 the hydrocracking reactor is loaded with catalyst , the lower bed is packed with cata...

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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 to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad. With the reduction of demand in my country's current diesel market, reducing diesel yield and increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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