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Propylene oxide purification method and purification device

A technology of propylene oxide and purification methods, applied in organic chemistry, azeotropic distillation, etc., to achieve the effects of reducing losses, increasing yields, and reducing energy consumption

Active Publication Date: 2021-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology can only be used for the removal of light components whose boiling point is lower than that of propylene oxide, which can be azeotroped with the extractant, and the proportion of impurities in water is much larger than that of impurities in extractant during phase separation.

Method used

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  • Propylene oxide purification method and purification device
  • Propylene oxide purification method and purification device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] according to figure 1 The process flow shown, the extractant is n-octane, in the stream containing 1,2-propylene oxide, extractant and impurity propylene glycol monomethyl ether, propylene glycol dimethyl ether, by weight percentage, the impurity propylene glycol monomethyl ether, propylene glycol The content of dimethyl ether is 1.0%, the ratio of extractant to 1,2-propylene oxide is 2.1:1, the number of theoretical plates of the separation tower is 30, and the side stream of the separation tower is located at the seventh theoretical plate.

[0097] Extraction tower operating conditions: pressure 0.043MPaG, tower top temperature 75°C.

[0098] The flow rate of the side stream azeotrope is 1.5:1 of the impurity flow rate contained in the feed stream; the pressure of the side stream is 0.02MPaG, the temperature is 100°C, the impurity propylene glycol monomethyl ether and propylene glycol dimethyl ether content is 52.85wt%, and the side stream impurity propylene glycol M...

Embodiment 2

[0101] according to figure 1 The process flow shown, the extractant is n-octane, in the stream containing 1,2-propylene oxide, extractant and impurity propylene glycol monomethyl ether, propylene glycol dimethyl ether, by weight percentage, the impurity propylene glycol monomethyl ether, propylene glycol The content of dimethyl ether is 1.0%, the ratio of extractant to 1,2-propylene oxide is 2.1:1, the number of theoretical plates of the separation tower is 30, and the side stream of the separation tower is located at the seventh theoretical plate.

[0102] Extraction tower operating conditions: pressure 0.043MPaG, tower top temperature 75°C.

[0103] The flow rate of the side stream azeotrope is 2.5:1 of the impurity flow rate contained in the feed stream; the pressure of the side stream is 0.02MPaG, the temperature is 100°C, the content of impurity propylene glycol monomethyl ether and propylene glycol dimethyl ether is 52.85wt%, and the side stream impurity propylene glycol...

Embodiment 3

[0106] according to figure 1 The process flow shown, the extractant is n-octane, in the stream containing 1,2-propylene oxide, extractant and impurity propylene glycol monomethyl ether, propylene glycol dimethyl ether, by weight percentage, the impurity propylene glycol monomethyl ether, propylene glycol The content of dimethyl ether is 1.0%, the ratio of extractant to 1,2-propylene oxide is 2.1:1, the number of theoretical plates of the separation tower is 30, and the side stream of the separation tower is located at the seventh theoretical plate.

[0107] Extraction tower operating conditions: pressure 0.043MPaG, tower top temperature 75°C.

[0108] The flow rate of the azeotrope stream produced by the side stream is 3.5:1 of the impurity flow rate contained in the feed stream; the pressure of the side stream is 0.02MPaG, the temperature is 100°C, the content of impurity propylene glycol monomethyl ether and propylene glycol dimethyl ether is 52.85wt%, and the side stream im...

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Abstract

The invention relates to a purification method and purification device of propylene oxide, which mainly solves the problem of low purity of extractant, large loss, low yield of propylene oxide, and low yield of propylene glycol monomethyl ether and propylene glycol dimethyl ether caused by the accumulation of impurities in heavy components of propylene glycol monomethyl ether and propylene glycol dimethyl ether in the prior art. The problem of high energy consumption. The method comprises the following steps: a) the feed stream containing propylene oxide, propylene glycol monomethyl ether and propylene glycol dimethyl ether and the extractant stream enter the extraction tower, the light component impurity stream is obtained at the top of the tower, and the crude extractant is obtained at the bottom of the tower Logistics; b) the crude extraction agent stream enters the separation tower, the top of the tower obtains the propylene oxide product, and the first stream is obtained at the bottom of the tower; c) the separation tower is sufficient to make the extraction agent and propylene glycol monomethyl ether, propylene glycol dimethyl ether Operate under the condition of forming an azeotrope, and extract the stream containing extractant-propylene glycol monomethyl ether azeotrope and extractant-propylene glycol dimethyl ether azeotrope in the side line of the separation tower. The method can be used in the industrial production of propylene oxide.

Description

technical field [0001] The invention relates to a propylene oxide purification method and a purification device, in particular to a purification method and a purification device for recovering an extractant through extraction and rectification of propylene oxide. Background technique [0002] Propylene oxide (PO) is mainly used in the production of polyether polyols, propylene glycol and propylene glycol ethers. Its output in propylene derivatives is second only to polypropylene, and it is the second largest propylene derivative. According to statistics, in 2011, the global consumption of propylene oxide used in the production of polyether polyols accounted for about 66% of the total consumption, that used in the production of propylene glycol accounted for about 17%, and that used in the production of propylene glycol ethers accounted for about 6%. . In 2011, the global production capacity of propylene oxide was 8.822 million tons, and it exceeded 10 million tons in 2016. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/32B01D3/36
Inventor 胡松胡帅李晗杨卫胜
Owner CHINA PETROLEUM & CHEM CORP