Method for producing clean low freezing point diesel oil by treating high nitrogen diesel oil

A diesel and clean technology, applied in the treatment of hydrocarbon oil, hydrotreating process, petroleum industry, etc., can solve the limitation of diesel fraction yield and pour point depressurization effect, reduce the service life of hydropour pour point depressant catalyst, and reduce the reaction temperature at the bed outlet. Advanced problems, to achieve good selective cracking performance, good isomerization performance, and the effect of lowering freezing point

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the temperature drop in the bed of the hydrodepreciation catalyst is relatively large, and the yield of the diesel fraction and the improvement of the depreciation effect are limited to a certain extent, which reduces the service life of the hydrodecondensation catalyst.
[0006] CN102051232A introduces a method for diesel hydrotreating decondensation. This method is to adjust the properties of the catalyst so that the effect of diesel decondensation is good and the yield of diesel fractions is high. The combination process, the contradiction between the pour point depressing effect and the diesel fraction yield still exists
[0007] CN102453531A has introduced a kind of method of diesel oil hydrodepreciation, although the average reaction temperature of hydrodepreciation catalyst has been improved, and the temperature rise of refining agent has been used to increase the utilization rate of depreciation catalyst, but the reaction at the outlet of each bed layer The temperature is still relatively high, and the cycle is somewhat limited

Method used

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  • Method for producing clean low freezing point diesel oil by treating high nitrogen diesel oil

Examples

Experimental program
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Effect test

Embodiment 1

[0043] use figure 1 The process flow shown is to produce low-condensation-point diesel oil by using gradation series and mixed packing process. In Example 1, two hydrogenation reaction zones connected in series are included, and in the composite bed of the depreciation catalyst in each reaction zone, the mixing volume ratio of the hydrogenation modified isomerization depreciation catalyst to the hydrogenation modified isomerization depreciation catalyst is 1:2 . The hydrorefining catalyst agent used in Example 1 is FF-36 catalyst, the hydrogenation modified isomerization depreciation catalyst is FC-14 catalyst, and the hydrodepreciation catalyst is FDW-3 catalyst, all of which are Fushun Petroleum A commercial catalyst developed and produced by the Chemical Research Institute.

[0044] The operating conditions and test results are listed in Table 3.

Embodiment 2

[0046] use figure 1The process flow shown is to produce low-condensation-point diesel oil by using gradation series and mixed packing process. In embodiment 1, two hydrogenation reaction zones connected in series are included, and in the composite depreciation catalyst bed of each reaction zone, the mixing volume ratio of the hydrogenation modified isomerization depreciation catalyst and the hydrogenation modified isomerization depreciation catalyst is 1:2 , The total amount of catalyst used is the same as that of Comparative Example 1 and Comparative Example 2. The hydromodified isomerization depreciation catalyst used in Example 2 was FC-14G catalyst, and the hydrodegradation catalyst was FDW-3 catalyst, both of which were commercial catalysts developed and produced by Fushun Petrochemical Research Institute.

[0047] The operating conditions and test results are listed in Table 3.

[0048] Table 2 Raw oil properties table.

[0049] project Raw oil source...

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Abstract

The invention discloses a method for producing clean low freezing point diesel oil by treating high nitrogen diesel oil. The method comprises: after mixing a diesel oil raw material with hydrogen, sequentially feeding the mixture through at least two serial hydrogenation reaction regions, wherein each of the hydrogenation reaction regions according a material flowing direction sequentially comprises a hydrogenation refining catalyst bed layer and a compound catalyst bed layer mixed and filled with a hydrodewaxing catalyst and a hydrogenation modified isomerization-visbreaking catalyst; and separating and fractionating a reaction effluent obtained in the last hydrogenation reaction region to obtain the low freezing point diesel oil. According to the method disclosed by the invention, temperature rise in a modified depressing process and temperature drop in a hydrodewaxing process are reasonably utilized,so that the yield and cetane number of the diesel oil are improved while the low freezing point diesel oil is produced, and therefore, the hot-spot temperature is reduced and the operating period is prolonged. In addition, the consumption of cold hydrogen or the gas loss of a heating furance is reduced, and the operating cost is further lowered.

Description

technical field [0001] The invention relates to a process method for processing low-quality diesel oil to produce low-condensation diesel oil, in particular to a hydrogenation method for producing clean low-condensation diesel oil through catalyst grading technology and composite filling technology. Background technique [0002] Diesel, as a fuel for compression ignition engines, plays an irreplaceable role as a non-renewable resource in modern production and life, and can be used as vehicles, tanks, airplanes, tractors, railway vehicles and other vehicles or other machinery Fuel can also be used for power generation, heating, etc. Depending on the industry and environment in which it is used, the quality requirements of users for diesel products are also very different. For people living in alpine regions or in winter, the demand for low-condensing-point diesel has always been high. The traditional choice The cracking process can process waxy heavy diesel fractions, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/02C10G49/02
Inventor 杜艳泽王凤来秦波
Owner CHINA PETROLEUM & CHEM CORP
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