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Method and device for removing oxygen-containing compounds in narrow fraction of Fischer-Tropsch synthetic oil

A Fischer-Tropsch synthetic oil and compound technology, which is applied in the fields of hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of high energy consumption and equipment costs, and complicated processes, so as to improve market competitiveness, simple process, The effect of high economic benefit

Inactive Publication Date: 2018-12-28
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned literature generally has the defects of complicated process, high energy consumption and equipment cost

Method used

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  • Method and device for removing oxygen-containing compounds in narrow fraction of Fischer-Tropsch synthetic oil
  • Method and device for removing oxygen-containing compounds in narrow fraction of Fischer-Tropsch synthetic oil
  • Method and device for removing oxygen-containing compounds in narrow fraction of Fischer-Tropsch synthetic oil

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Embodiment 1

[0026] Applying the present invention to the process of removing oxygenates in Fischer-Tropsch synthetic light oil narrow cuts, such as figure 1As shown, it includes a dividing wall extractive distillation column (T11), a condenser, a reboiler, a pump, and related feed lines and lines connecting the above equipment. The raw material is 1000g C5 narrow fraction cut from Fischer-Tropsch synthetic oil light oil, including various C5 hydrocarbons and trace amounts of oxygen-containing compounds. The hydrocarbons mainly include normal alkanes and α-olefins, and also include some isoparaffins, internal olefins, branched olefins, and a small amount of cycloalkanes, aromatics, and cycloolefins. Oxygenated compounds include one or more of alcohols, aldehydes, ketones, acids, and esters. The extractant used is cyclohexanone. The number of theoretical plates on the feed side is 10, the number of theoretical plates on the non-feed side is 200, the number of theoretical plates from the b...

Embodiment 2

[0028] Applying the present invention to the process of removing oxygenates in Fischer-Tropsch synthetic light oil narrow cuts, such as figure 2 As shown, including the extractive rectification column with dividing wall (T12), condenser, reboiler, pump and related feed lines and lines connecting the above equipment. The raw material is 1000g C6 narrow fraction cut from Fischer-Tropsch synthetic oil light oil, including various C6 hydrocarbons and trace oxygen-containing compounds. The hydrocarbons mainly include normal alkanes and α-olefins, and also include some isoparaffins, internal olefins, branched olefins, and a small amount of cycloalkanes, aromatics, and cycloolefins. Oxygenated compounds include one or more of alcohols, aldehydes, ketones, acids, and esters. The extractant used is furfural. The number of theoretical plates on the feed side is 200, the number of theoretical plates on the non-feed side is 10, the number of theoretical plates from the top of the parti...

Embodiment 3

[0030] Applying the present invention to the process of removing oxygenates in Fischer-Tropsch synthetic light oil narrow cuts, such as image 3 As shown, it includes a dividing wall azeotropic distillation column (T21), a condenser, a reboiler, a pump, and related feed lines and lines connecting the above equipment. The raw material is 1000g C8 narrow fraction cut from Fischer-Tropsch synthetic oil light oil, including various C8 hydrocarbons and trace oxygen-containing compounds. The hydrocarbons mainly include normal alkanes and α-olefins, and also include some isoparaffins, internal olefins, branched olefins, and a small amount of cycloalkanes, aromatics, and cycloolefins. Oxygenated compounds include one or more of alcohols, aldehydes, ketones, acids, and esters. The entrainer used is formaldehyde-methanol aqueous solution. The number of theoretical plates on the feed side of the raw material is 50, the number of theoretical plates on the non-raw material feed side is 1...

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Abstract

The invention relates to a method for removing oxygen-containing compounds in a narrow fraction of Fischer-Tropsch synthetic oil. A dividing-wall extractive distillation tower or a dividing-wall azeotropic distillation tower is adopted. According to a process, the dividing-wall extractive distillation tower or the dividing-wall azeotropic distillation tower is adopted to replace a conventional extraction or azeotropic distillation twin tower structure. After the separation and purification by the process, the mass content of the C5-C12 fraction product can reach 99% or above, and the recoveryrate can be 95% or more. The method has the advantages that a dividing-wall tower technology is combined with extractive distillation or azeotropic distillation, the energy consumption and device costcan be greatly reduced, and high economic benefits are created.

Description

technical field [0001] The invention relates to a method and device for removing oxygen-containing compounds in the narrow fraction of Fischer-Tropsch synthetic oil by extraction or azeotropic distillation in a dividing wall tower, and is especially suitable for the C5-C12 narrow fraction obtained by cutting Fischer-Tropsch synthetic light oil. Removal of oxygenates from fractions. Background technique [0002] Fischer-Tropsch synthesis is the indirect coal liquefaction process, in which the synthesis gas (CO, H 2 ) into gasoline, diesel and other hydrocarbon products. The reaction crude products are mainly light oil, heavy oil and heavy wax. Fischer-Tropsch synthesis products are usually used to further produce gasoline, diesel, naphtha and other products, and the olefins in them need to be hydrotreated, resulting in the waste of α-olefin components with higher added value. The main substances in Fischer-Tropsch synthetic light oil are C6-C10 normal paraffins and normal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/00C07C11/10C07C11/107C07C11/02C07C9/15C07C9/16
CPCC07C7/005C07C11/10C07C11/107C07C11/02C07C9/15C07C9/16
Inventor 李洪赵悦李鑫钢高鑫
Owner TIANJIN UNIV
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