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A deep coupling process of hydroisomerization and pour point depressing for the production of low-point diesel oil

A technology of hydroisomerization and isomerization depreciation, which is applied in the fields of hydrotreating process, petroleum industry, hydrocarbon oil treatment, etc., and can solve the limitation of reducing the service life of hydrodecondensation catalyst, diesel fraction yield and depreciation effect , high reaction temperature at the outlet of the bed, etc., to achieve good selective cracking performance, good hydrogenation saturation and ring-opening conversion, and lower freezing point

Active Publication Date: 2017-01-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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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  • A deep coupling process of hydroisomerization and pour point depressing for the production of low-point diesel oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 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 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 hydromodified isomerization depreciation catalyst used in Example 1 is FC-14 catalyst, the hydrodepreciation catalyst is FDW-3 catalyst, and the hydrorefining catalyst is FH-UDS catalyst, all of which are Fushun Petroleum A commercial catalyst developed and produced by the Chemical Research Institute.

[0043] The operating conditions and test results are listed in Table 3.

Embodiment 2

[0045] use figure 1 The 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 to 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.

[0046] The operating conditions and test results are listed in Table 3.

[0047] Table 2 Raw oil properties table.

[0048] project Raw oil source...

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Abstract

The invention discloses a hydroisomerization pour-point-depressing deep-coupling process for producing low-pour-point diesel oil. The process comprises the following steps: mixing a diesel oil raw material and hydrogen; then successively allowing the mixture to pass through at least two tandem hydrogenation reaction zones, wherein each hydrogenation reaction zone successively includes a composite catalyst bed layer filled by a mixture of a hydrodewaxing catalyst and a hydro-upgrading isomerization pour-point-depressing catalyst, and a hydrofining catalyst bed layer according to a flow direction of the materials; and finally, subjecting an obtained reaction effluent of the last hydrogenation reaction zone to separation and fractionation so as to obtain the low-pour-point diesel oil. The method provided by the invention reasonably utilizes temperature rise in upgrading pour-point-depressing process and temperature drop in hydrodewaxing process, so clean low-pour-point diesel oil is produced; meanwhile, the yield and cetane number of the diesel oil are improved; hot-spot temperature of a device is reduced; and operation cycle is prolonged; moreover, consumption of cooled hydrogen and fuel gas loss of a heating furnace are reduced, and operation cost is saved.

Description

technical field [0001] The invention relates to a hydrogenation isomerization deep coupling process for producing low-condensation diesel oil, in particular to a hydrogenation process for producing high-quality clean low-condensation-point clean diesel oil through catalyst grading technology and uniform mixing and filling technology method. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/02
Inventor 杜艳泽关明华
Owner CHINA PETROLEUM & CHEM CORP
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