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A method for producing middle distillates from Fischer-Tropsch synthetic oil

A technology for Fischer-Tropsch synthetic oil and middle distillate oil, which is applied in the field of oil refining, can solve the problems of low yield and low selectivity of middle distillate oil, etc., so as to improve the selectivity and yield, save investment costs, and have flexible product solutions. Effect

Active Publication Date: 2018-11-02
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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  • A method for producing middle distillates from Fischer-Tropsch synthetic oil
  • A method for producing middle distillates from Fischer-Tropsch synthetic oil
  • A method for producing middle distillates from Fischer-Tropsch synthetic oil

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Embodiment 1

[0076] The present embodiment is used to illustrate the method for producing middle distillates from Fischer-Tropsch synthetic oil of the present invention, specifically as follows:

[0077] The Fischer-Tropsch synthetic oil raw material enters the hydrofinishing reactor, and successively contacts and reacts with the hydrogenation protection catalyst and the hydrofinishing catalyst, and the hydrofinishing reaction effluent enters the separation and fractionation system for separation and fractionation to obtain the first naphtha fraction, light Diesel fractions and heavy oil fractions. Wherein the heavy oil fraction enters the heterogeneous hydrocracking reactor provided with the upper reaction zone and the lower reaction zone, and according to the flow direction of the reactant flow, the heavy oil fraction is respectively in the upper reaction zone and the lower reaction zone with the isomerization hydrocracking catalyst RCF -1 contacting and reacting with isomeric hydrocrack...

Embodiment 2

[0081] The present embodiment is used to illustrate the method for producing middle distillates from Fischer-Tropsch synthetic oil of the present invention, specifically as follows:

[0082] The Fischer-Tropsch synthetic oil raw material enters the hydrofinishing reactor, and successively contacts and reacts with the hydrogenation protection catalyst and the hydrofinishing catalyst, and the hydrofinishing reaction effluent enters the separation and fractionation system for separation and fractionation to obtain the first naphtha fraction, light Diesel fractions and heavy oil fractions. Wherein the heavy oil fraction enters the heterogeneous hydrocracking reactor provided with the upper reaction zone and the lower reaction zone, and according to the flow direction of the reactant flow, the heavy oil fraction is respectively in the upper reaction zone and the lower reaction zone with the isomerization hydrocracking catalyst RCF -1 contact with the heterogeneous hydrocracking cat...

Embodiment 3

[0099] Present embodiment adopts the method similar to embodiment 1 to carry out, and difference is:

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

[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 the middle distillate oil is 79, and the sulfur and nitrogen contents are very low, so it can be used as a blending component of high cetane number diesel oil.

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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 from Fischer-Tropsch synthetic oil, more specifically, to a method for producing middle distillate from Fischer-Tropsch synthetic oil by hydrotreating and upgrading. Background technique [0002] With the rapid development of the national economy, my country's oil consumption presents a rapid upward trend. At the same time, with the increasingly stringent environmental protection requirements, more stringent requirements are put forward for the composition of engine fuels, impurity content and pollutant emissions during processing. However, as a non-renewable energy source, oil is facing a crisis of depletion, and the quality of oil is getting worse and worse, and the trend of inferior and heavy quality is becoming more and more obvious. Therefore, the development of new sustainable energy technologies that meet the requirements of environment...

Claims

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Application Information

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Patent Type & Authority Patents(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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