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Hydrogenation method for Fischer-Tropsch synthesis oil

A Fischer-Tropsch synthetic oil and Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, hydrocarbon oil cracking, petroleum industry, etc., can solve the problems of complex operation, high equipment investment and high freezing point of diesel products

Active Publication Date: 2017-12-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that it adopts an integrated process, the operation flexibility is small, the condensation point of diesel products is high, and the yield is low
But its disadvantages are that the Fischer-Tropsch condensate goes to the hydrofining reactor separately, and the catalyst is easy to coke; the synthetic wax is directly sent to hydrocracking without hydrofining, which leads to an increase in hydrocracking investment; at the same time, the freezing point of diesel products cannot be guaranteed
[0011] CN200710065309 discloses a process for hydrotreating Fischer-Tropsch synthetic oil. The process is to first hydrotreat the full fraction of Fischer-Tropsch synthetic oil, then separate the first diesel oil fraction from the product, and then hydrocrack the tail oil to produce the cracked product Then separate the second diesel fraction, but this method requires high equipment investment, complicated operation, and can only produce part of low-condensation diesel

Method used

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  • Hydrogenation method for Fischer-Tropsch synthesis oil
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  • Hydrogenation method for Fischer-Tropsch synthesis oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Take 200g of NaY molecular sieve raw powder prepared in the laboratory, mix it with ammonium nitrate with a concentration of 2.0mol / L according to the liquid-solid ratio of 4:1, 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 1.8%;

[0037] (2) Hydrothermally treat the Y molecular sieve obtained in step (1) at 550°C and 0.3Mpa for 2 hours;

[0038] (3) Mix the Y molecular sieve obtained in step (2) with a sodium chloride solution with a concentration of 1.7mol / L according to the liquid-solid ratio of 5:1, exchange at 65°C for 1 hour, repeat this process 3 times, and the Y molecular sieve after exchange Na content in Na 2 O is calculated as 3.8%;

[0039] (4) The molecular sieve obtained in step (3) is mixed with 0.5mol / L ammonium fluorosilicate and 0.3mol / L citric acid (with H + ) solution mixed beating, 85 ℃ for 2 hours;

[0040] (5) The molecular sieve Y after the treatment in ...

Embodiment 2

[0046] (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%;

[0047] (2) Hydrothermally treat the Y molecular sieve obtained in step (1) at 530°C and 0.15Mpa for 1.5 hours;

[0048] (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;

[0049] (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;

[0050] (5) The Y molecu...

Embodiment 3

[0056] (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%;

[0057] (2) Hydrothermally treat the Y molecular sieve obtained in step (1) at 550°C and 0.2Mpa for 2 hours;

[0058] (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%;

[0059] (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...

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Abstract

The invention discloses a hydrogenation method for Fischer-Tropsch synthesis oil. The hydrogenation method comprises the following steps: (1) mixing Fischer-Tropsch synthesis oil and hydrogen, and allowing the obtained mixture to enter a hydrocracking reactor for a reaction under the action of a hydrocracking catalyst, wherein the average pore size of the hydrocracking catalyst tends to decrease along the flow direction of a material flow; (2) separating a hydrogenation effluent obtained in the step (1) into a gas phase and a liquid phase, recycling the gas phase and allowing the liquid phase to enter a fractionation column; and (3) carrying out fractionation in the fractionation column to obtain naphtha, an aviation fuel, diesel and tail oil and recycling the tail oil to the hydrocracking reactor. The method can greatly improve the yield of light oil, reduce the freezing point of the aviation fuel and the condensation point of diesel.

Description

technical field [0001] The invention relates to a method for hydrogenating Fischer-Tropsch synthetic oil, in particular to a method for hydrogenating Fischer-Tropsch synthetic oil to produce high-quality clean fuel. Background technique [0002] With the rapid development of the automobile industry, aviation industry, etc., the supply of natural oil is in short supply, and countries all over the world have joined the ranks of research on new coal liquefaction technologies, making coal-based synthetic (F-T synthetic) fuel "CTL" gradually put on the industrialization agenda. Through indirect conversion technology, Fischer-Tropsch synthetic oil is converted into chemical products such as gasoline, diesel oil, wax, ethylene, propylene, polymer, ammonia, alcohol, aldehyde, ketone, etc. The composition and properties of oil synthesized by coal indirect liquefaction (F-T) are very different from natural oil: no sulfur, no nitrogen and other impurities, (no) cyclic hydrocarbons, hig...

Claims

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Application Information

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IPC IPC(8): C10G47/16B01J29/16
CPCB01J29/166B01J2229/18C10G47/16C10G2300/1022C10G2300/70C10G2400/04
Inventor 崔哲于波王仲义孙士可吴子明曹正凯
Owner CHINA PETROLEUM & CHEM CORP
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