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Method for producing middle distillate oil from Fischer-Tropsch synthetic oil

A technology for Fischer-Tropsch synthetic oil and middle distillate oil, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of low yield and low selectivity of middle distillate oil, and achieve improved selectivity and Yield, investment cost savings, and flexible product solutions

Active Publication Date: 2017-01-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of low selectivity and low yield of middle distillates in the prior art, and provide a new method for producing middle distillates by hydrotreating Fischer-Tropsch synthetic oil

Method used

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  • Method for producing middle distillate oil from Fischer-Tropsch synthetic oil
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  • Method for producing middle distillate oil from Fischer-Tropsch synthetic oil

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Embodiment 1

[0076] This embodiment is used to illustrate the method for producing middle distillate oil from Fischer-Tropsch synthetic oil according to the present invention, and the details are as follows:

[0077] The Fischer-Tropsch synthetic oil feedstock enters the hydrorefining reactor, and sequentially contacts and reacts with the hydrogenation protection catalyst and the hydrorefining catalyst. The hydrorefining reaction effluent enters the separation and fractionation system for separation and fractionation to obtain the first naphtha fraction, light Diesel fraction and heavy oil fraction. The heavy oil fraction then enters the isomerization hydrocracking reactor equipped with the upper reaction zone and the lower reaction zone. According to the flow direction of the reactant stream, the heavy oil fraction is in the upper reaction zone and the lower reaction zone respectively with the isomer hydrocracking catalyst RCF -1 and the isomeric hydrocracking catalyst CDB-46 contact reactio...

Embodiment 2

[0081] This embodiment is used to illustrate the method for producing middle distillate oil from Fischer-Tropsch synthetic oil according to the present invention, and the details are as follows:

[0082] The Fischer-Tropsch synthetic oil feedstock enters the hydrorefining reactor, and sequentially contacts and reacts with the hydrogenation protection catalyst and the hydrorefining catalyst. The hydrorefining reaction effluent enters the separation and fractionation system for separation and fractionation to obtain the first naphtha fraction, light Diesel fraction and heavy oil fraction. The heavy oil fraction then enters the isomerization hydrocracking reactor equipped with the upper reaction zone and the lower reaction zone. According to the flow direction of the reactant stream, the heavy oil fraction is in the upper reaction zone and the lower reaction zone respectively with the isomer hydrocracking catalyst RCF -1 and the heterogeneous hydrocracking catalyst CDB-44 contact re...

Embodiment 3

[0099] This embodiment adopts a method similar to that of embodiment 1, except that:

[0100] In this embodiment, based on the total weight of the tail oil fraction in the effluent of the heterogeneous hydrocracking reaction, the tail oil fraction recycled to the inlet of the heterogeneous hydrocracking reactor is 40% by weight. The rest are the same as in Example 1. The specific reaction conditions, reaction performance and product properties after the isomerization hydrocracking reaction are shown in Table 4 and Table 5.

[0101] It can be seen from Table 5 that the selectivity of the middle distillate in this example is 81.36%, and the bed temperature rise of the cracking reactor is 33°C.

[0102] It can be seen from Table 5 that the cetane number of middle distillate oil is 79, and the content of sulfur and nitrogen is very low. It can be used as a high cetane number diesel blending component.

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Abstract

The invention relates to the field of oil refining and discloses a method for producing middle distillate oil from Fischer-Tropsch synthetic oil. The method comprises the following steps: introducing the Fischer-Tropsch synthetic oil and a hydrogen-containing stream into a hydrofining reactor for reaction; sequentially separating and fractionating hydrofining reaction effluents to obtain a first naphtha fraction, a light diesel oil fraction and a heavy oil fraction; introducing the heavy oil fraction into a heterogeneous hydrocracking reactor for reaction; then sequentially separating and fractionating heterogeneous hydrocracking reaction effluents, wherein at least two reaction regions are arranged in the heterogeneous hydrocracking reactor; cracking activities of heterogeneous hydrocracking catalysts per unit volume in two adjacent reaction regions are sequentially reduced in a flow direction of the reaction stream. With adoption of the method provided by the invention, the selectivity and yield of the middle distillate oil can be improved when the middle distillate oil is produced through hydrogenation and quality increasing of the Fischer-Tropsch synthetic oil.

Description

Technical field [0001] The invention relates to the field of oil refining, in particular, to a method for producing middle distillate oil from Fischer-Tropsch synthetic oil, and more specifically, to a method for producing middle distillate oil from Fischer-Tropsch synthetic oil by hydro-upgrading. Background technique [0002] With the rapid development of the national economy, my country's oil consumption is showing a rapid upward trend. At the same time, with the increasingly stringent environmental protection requirements, more stringent requirements have been put forward on the composition of engine fuels, the content of impurities and the emission of pollutants during processing. However, as a non-renewable energy source, oil is facing a crisis of depletion, the quality of oil is getting worse and worse, and the trend of deterioration and re-quality is becoming more and more obvious. Therefore, the development of new sustainable energy technologies that meet the requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G65/12
Inventor 李猛牛传峰吴昊董松涛田鹏程
Owner CHINA PETROLEUM & CHEM CORP
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