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Method for producing diesel oil from Fischer-Tropsch synthetic oil

A Fischer-Tropsch synthetic oil and Fischer-Tropsch synthesis technology, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of low diesel density, high freezing point, and can not meet the requirements of vehicle diesel indicators, etc. The effect of increasing density

Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But each has some defects, the diesel oil obtained in US6858127 has low density and high freezing point, which cannot meet the requirements of vehicle diesel oil indicators, the diesel oil obtained in US7390397 can only be used as a blending component, and only part of low-condensation diesel oil can be obtained in CN200710065309

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  • Method for producing diesel oil from Fischer-Tropsch synthetic oil

Examples

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Embodiment 1

[0054] The mixed oil LLH-1 of LTFT-LO-1, LTFT-HO-1 and HTFT-1 is used as the raw material for hydrofining reaction, wherein the LTFT-LO-1, LTFT-HO-1 and HTFT-1 are The products prepared under the same Fischer-Tropsch synthesis reaction conditions were isolated, and their properties are shown in Table 1. Wherein, the weight ratio of LTFT-LO-1:LTFT-HO-1:LTFT-HW-1 is 10:3:12.

[0055] Such as figure 1 As shown, the hydrofinishing product is separated into hydrogen-rich gas, water and liquid hydrocarbons through the separation system, the hydrogen-rich gas is circulated back to the reaction system, and the water is discharged from the device. The liquid hydrocarbons enter the fractionation tower to distill the naphtha fraction 350°C, among which the naphtha fraction and the diesel fraction are used as products. The wax oil fraction >350°C fractionated by the fractionating tower is mixed with LTFT-HW-1 (see Table 1 for properties) and then enters the hydrocracking reactor for hyd...

Embodiment 2

[0064] The mixed oil LLH-2 of LTFT-LO-2, LTFT-HO-2 and HTFT-2 is used as the raw material for hydrofining reaction, wherein the LTFT-LO-2, LTFT-HO-2 and HTFT-2 are The products prepared under the same Fischer-Tropsch synthesis reaction conditions were isolated, and their properties are shown in Table 2. Wherein, the weight ratio of LTFT-LO-2:LTFT-HO-2:LTFT-HW-2 is 5.1:2.6:8.9.

[0065] Such as figure 1 As shown, the hydrofinishing product is separated into hydrogen-rich gas, water and liquid hydrocarbons through the separation system, and the hydrogen-rich gas and water are discharged from the device. The liquid hydrocarbons enter the fractionation tower to distill the naphtha fraction 350°C, among which the naphtha fraction and the diesel fraction are used as products. The wax oil fraction >350°C fractionated by the fractionating tower is mixed with LTFT-HW-2 (see Table 1 for properties) and then enters the hydrocracking reactor for hydrocracking reaction, and the hydrocrac...

Embodiment 3

[0070] The mixed oil LLH-3 of LTFT-LO-3, LTFT-HO-3 and HTFT-3 is used as the raw material for hydrofining reaction, wherein the LTFT-LO-3, LTFT-HO-3 and HTFT-3 are The products prepared under the same Fischer-Tropsch synthesis reaction conditions were isolated, and their properties are shown in Table 3. Wherein, the weight ratio of LTFT-LO-3:LTFT-HO-3:LTFT-HW-3 is 6.2:2.3:10.2.

[0071] Such as figure 1 As shown, the hydrofinishing product is separated into hydrogen-rich gas, water and liquid hydrocarbons through the separation system, and the hydrogen-rich gas and water are discharged from the device. The liquid hydrocarbons enter the fractionation tower to distill the naphtha fraction at 350°C, among which the naphtha fraction and the diesel fraction are used as products. The wax oil fraction >350°C fractionated by the fractionating tower is mixed with LTFT-HW-3 (see Table 1 for properties) and then enters the hydrocracking reactor for hydrocracking reaction, and the hydro...

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Abstract

The invention discloses a method for producing diesel oil from Fischer-Tropsch synthetic oil. The method comprises the following steps of (1) contacting mixed oil composed of low temperature method Fischer-Tropsch synthetic light oil, low temperature method Fischer-Tropsch synthetic heavy oil and full fractions of high temperature method Fischer-Tropsch synthetic oil in presence of a hydrorefining catalyst, under hydrorefining reaction conditions; and (2) performing gas-liquid separation on the product obtained from the step (1), and cutting the product to obtain a first wax oil fraction; (3) contacting a mixture of the first wax oil fraction obtained from the step (2) and the low temperature method Fischer-Tropsch synthetic wax with hydrogen in the presence of a hydrocracking catalyst, under hydrocracking reaction conditions; and (4) performing the gas-liquid separation and a cutting operation on the product obtained from the step (3). The method has the following advantages of (1) improving the density of the obtained diesel oil, allowing the diesel oil to meet the requirement of Europe IV diesel oil standard; (2) greatly reducing a condensation point of the obtained diesel oil; and (3) effectively preventing the occurrence from a too fast coking phenomenon.

Description

technical field [0001] The invention relates to a method for producing diesel from Fischer-Tropsch synthetic oil. Background technique [0002] With the decrease of petroleum resources in the world, the development of alternative energy technology has gradually been paid attention to. Fischer-Tropsch synthesis technology is prepared as a technology that can use coal, natural gas, biomass and other raw materials containing carbon and hydrogen resources to produce high-clean fuels. attention. Fischer-Tropsch synthesis technology is distinguished by operating temperature, and can be divided into low-temperature Fischer-Tropsch synthesis and high-temperature Fischer-Tropsch synthesis. The synthetic oils of the two methods are both sulfur-free and nitrogen-free. Among them, low-temperature Fischer-Tropsch synthetic oil has the characteristics of high straight-chain alkanes, high freezing point of oil products, and low product oil density; , High content of diolefins, containing...

Claims

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Application Information

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IPC IPC(8): C10G67/02
Inventor 吴昊胡志海聂红李猛董松涛王锦业
Owner CHINA PETROLEUM & CHEM CORP
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