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Method for preliminarily separating Fischer-Tropsch synthesized water by dividing-wall distillation column

A technology of dividing wall distillation and Fischer-Tropsch synthesis, which is applied in the field of preliminary separation of Fischer-Tropsch synthetic water by using a wall rectifying tower, can solve problems such as environmental protection and uneconomical, and achieve process energy consumption reduction, thermodynamic efficiency improvement, Effect of reducing energy consumption

Inactive Publication Date: 2019-05-24
HEBEI UNIV OF TECH
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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 provide a low energy consumption, high-efficiency Fischer-Tropsch synthetic water treatment method in order to solve the problems of uneconomical and environmental protection in the direct discharge of industrial Fischer-Tropsch synthetic water

Method used

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  • Method for preliminarily separating Fischer-Tropsch synthesized water by dividing-wall distillation column
  • Method for preliminarily separating Fischer-Tropsch synthesized water by dividing-wall distillation column
  • Method for preliminarily separating Fischer-Tropsch synthesized water by dividing-wall distillation column

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Embodiment 1

[0032] This embodiment is a method for preliminary separation of low-temperature Fischer-Tropsch synthetic water by using a rectifying tower with a dividing wall. The method includes using synthetic water produced by the low-temperature Fischer-Tropsch synthesis method as a raw material, and adopting a high-efficiency and energy-saving rectifying device for a rectifying wall of a dividing wall. Synthetic water raw materials are separated, and the top of the next-wall rectification tower is equipped with a condenser, and a reflux and recovery circuit, which can be used to extract the top product and adjust the reflux ratio; the second-wall rectification tower There is a reboiler at the bottom, which can provide heat for the evaporation of liquid in the whole rectification system; the middle part of the body of the rectifying column with dividing wall is provided with a vertical partition, and the two sides of the partition are divided into the pre-fractionation side and the main ...

Embodiment 2

[0049] This embodiment is a method for preliminary separation of high-temperature Fischer-Tropsch synthetic water by using a rectifying column next to the next wall. The process of this treatment method is the same as that of Example 1; the total number of theoretical plates is 60, and there are 25 theoretical plates on the upper side of the dividing plate. There are 9 theoretical plates on the lower side of the plate, and there are 26 theoretical plates in the entire partition height, the feed position is on the pre-fractionation side (counting from the bottom of the partition) on the sixth theoretical plate, and the side line extraction position is on the main tower side ( Counting down from the partition) the 15th theoretical board.

[0050] The composition of the high-temperature Fischer-Tropsch synthetic water raw material is as follows:

[0051] Raw material composition

[0052]

[0053]

[0054] (1) When the reflux ratio of the next-wall distillation column is co...

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Abstract

The invention relates to a method for preliminarily separating Fischer-Tropsch synthesized water by a dividing-wall distillation column. The method includes taking the synthesized water obtained fromliquid fuel production based on a Fischer-Tropsch synthesis method as a raw material, separating the synthesized water by the dividing-wall distillation column, adding the synthesized water via a pre-fractionation side feed inlet of the dividing-wall distillation column, obtaining a mixture of low-boiling-point oxygen-containing organics containing a trace amount of water at the top of the column,obtaining a dilute acid water solution mainly containing high-boiling-point organic acids at the bottom of the column, and extracting an oxygen-containing organic mixture mainly comprising mixed alcohols containing a small amount of water from the lateral line of a main column of the dividing-wall distillation column, wherein the operating conditions of the dividing-wall distillation column includes that the temperatures of the top, the bottom and the lateral line of the column are 30-80 DEG C, 70-160 DEG C and 50-130 DEG C respectively, the reflux ratio is 5-35, the gas phase distribution ratio is 0.5-20, and the liquid phase distribution ratio is 0.1-2. The method has the advantages that the dividing-column column distillation technology is fully utilized in the preliminary separation stage of the Fischer-Tropsch synthesized water in terms of energy conservation, and accordingly, energy consumption during treatment of the Fischer-Tropsch synthesized water is greatly reduced.

Description

technical field [0001] The invention relates to a method for separating oxygen-containing organic substances such as aldehydes, ketones, esters, alcohols and acids from water, in particular to a method for preliminary separation of Fischer-Tropsch synthetic water by using a rectifying column with a dividing wall. Background technique [0002] With the sharp increase in the demand for liquid fuels such as petroleum and the continuous reduction of the available reserves of petroleum resources, methods for producing scarce liquid fuels from raw materials such as coal, natural gas, and biomass have attracted more and more attention. The most representative method for the indirect liquefaction of coal, natural gas, biomass and other fuels is the Fischer-Tropsch synthesis method. The method is to convert carbon monoxide (CO) and hydrogen (H 2 )-based synthesis gas, a process for catalytically synthesizing hydrocarbon fuels under certain temperature and pressure conditions. The i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/80C07C31/04C07C31/08
CPCY02P20/10
Inventor 李春利张乾龙李浩方静王晨希
Owner HEBEI UNIV OF TECH
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