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A method for extracting and rectifying separation of propylene-propane with alkanes as extractant

A technology of extractive distillation and extractive distillation tower, which is applied in the separation field of organic chemistry, can solve the problems of affecting the environment, many equipments, large investment, etc., and achieve the effect of reducing energy consumption

Inactive Publication Date: 2016-03-23
WUHAN YOULIKE NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CH 3 CN is highly toxic, and water-containing acetonitrile is used to generate sewage that seriously affects the environment. At the same time, the process requires 4 towers, a lot of equipment, and a large investment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] The propylene-propane mixture with a weight concentration of 20% enters the 12th tray of the extractive distillation column with a theoretical tray number of 50 at a flow rate of 1250kg / h, and the n-pentane comes out of the separation column tank and is in the rectification column reboiler After exchanging heat with the bottom liquid of the rectifying tower, after exchanging heat with the propylene-propane mixture in the feed heat exchanger, it enters the tower from the 48th tray of the extractive distillation tower, and performs countercurrent extraction with the propylene-propane mixture. The flow rate of n-pentane is 2500kg / h. Control the temperature of the tower item at 40-45°C, the pressure at 1.2-1.5MPa, the propylene at the top of the tower enters the top condenser to condense, enters the reflux tank and refluxes through the reflux pump, controls the reflux ratio (weight ratio) 9-10, and the temperature of the tower kettle is 50-55 ℃.

[0030] The bottom liquid ...

example 2

[0033] The propylene-propane mixture with a weight concentration of 40% enters the 10th plate of the extractive distillation column with a theoretical plate number of 60 at a flow rate of 1250kg / h. After exchanging heat with the bottom liquid of the rectifying tower, it enters the column from the 58th tray of the extractive distillation tower after exchanging heat with the propylene-propane mixture in the feed heat exchanger, and conducts countercurrent extraction with the propylene-propane mixture. The flow rate of n-pentane is 3000kg / h. Control the temperature of the tower item at 40-45°C, the pressure at 1.2-1.5MPa, the propylene at the top of the tower enters the top condenser to condense, enters the reflux tank and refluxes through the reflux pump, controls the reflux ratio (weight ratio) 9-10, and the temperature of the tower kettle is 50-55 ℃.

[0034] The still liquid of the extractive distillation tower enters the fifth tray of the separation tower with a theoretical...

example 3

[0037] The propylene-propane mixture with a weight concentration of 50% enters the 12th plate of the extractive distillation column with a theoretical plate number of 40 at a flow rate of 1250kg / h. After exchanging heat with the bottom liquid of the rectifying tower, after exchanging heat with the propylene-propane mixture in the feed heat exchanger, it enters the tower from the 39th tray of the extractive distillation tower, and performs countercurrent extraction with the propylene-propane mixture. The flow rate of isopentane is 1700kg / h. Control the temperature of the tower item at 40-45°C, the pressure at 1.2-1.5MPa, the propylene at the top of the tower enters the top condenser to condense, enters the reflux tank and refluxes through the reflux pump, controls the reflux ratio (weight ratio) 9-10, and the temperature of the tower kettle is 50-55 ℃.

[0038] The bottom liquid of the extractive distillation tower enters the fifth tray of the separation tower with a theoretic...

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PUM

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Abstract

The invention discloses a method for extracting, rectifying and separating propylene-propane with alkane as an extractant. The propylene-propane mixture with a propylene content of 20 (wt)%-80(wt)% is exchanged with the extractant separated from the separation tower. Entering the middle part of the extractive distillation tower, the propylene-propane mixture flows countercurrently with the extractant in the rectification section, refluxes after being condensed by the top condenser, and part of the extracted propylene product enters the propylene product storage tank; the material in the extractive distillation tower enters the extractant and In the middle of the propane separation tower, a reboiler is installed in the tank of the separation tower, and a condenser is installed at the top of the tower. After being condensed by the condenser, the top material is refluxed. After heat exchange in the reboiler of the distillation column, it exchanges heat with the feed propylene-propane mixture and enters the column from the upper part of the extractive distillation column. After separation, the purity of propylene reaches 99.7 (wt)%. The present invention simultaneously performs heat exchange between the extractant and the rectification column feedstock and the feedstock in cascades, reducing energy consumption. The energy consumption for separating one ton of product is only 1.0-1.2Gcal. Technique requires 1.8-2.0Gcal.

Description

technical field [0001] The invention belongs to the technical field of separation of organic chemistry, and relates to a method for extracting and rectifying separation of propylene-propane with alkane as an extractant. Background technique [0002] Propylene is a colorless flammable gas at normal temperature and pressure, heavier than air, and forms an explosive mixture with air, with an explosion limit (volume), soluble in ethanol and ether, and slightly soluble in water. [0003] Propylene is one of the basic petrochemical raw materials, which can be used to produce a variety of important organic chemical raw materials, such as acrylonitrile, propylene oxide, epichlorohydrin, isopropanol, butanol, octanol, etc., and can also be directly synthesized into polypropylene , ethylene propane, etc. Propylene can be used as a raw material for polypropylene and isopropanol, as well as acrylic fiber, acrylonitrile and other products. Propylene is in great demand in my country, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C9/08C07C7/08
Inventor 尹华清罗光辉肖勇
Owner WUHAN YOULIKE NEW MATERIAL TECH