Propylene epoxide purifying method and purifying device

A technology of propylene oxide and purification methods, applied in organic chemistry, azeotropic distillation, etc., to achieve the effects of reduced energy consumption, increased yield, and improved purity

Active Publication Date: 2019-06-07
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 epoxide purifying method and purifying device
  • Propylene epoxide purifying method and purifying device

Examples

Experimental program
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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 propylene epoxide purifying method and purifying method. The problems that in the prior art, due to accumulation of heavy component impurities of propylene glycol monomethylether and propylene glycol dimethyl, an extraction agent is low in purity and large in loss, and propylene epoxide is low in yield and high in energy consumption are mainly solved. The method comprises the following steps of (1) making feeding material flows containing propylene epoxide, propylene glycol monomethyl ether and propylene glycol dimethyl and an extraction agent material flow enter anextraction tower, obtaining a light component impurity material flow on a tower top, and obtaining a crude extraction agent material flow on a tower bottom; (2) making the crude extraction agent material flow enter a separation tower, obtaining a propylene epoxide product on a tower top, and obtaining a first material flow on a tower bottom; and (3) operating the separation tower under conditionsenough for making an extraction agent, the propylene glycol monomethyl ether and the propylene glycol dimethyl form azeotrope, and collecting material flows which contain the extraction agent-propylene glycol monomethyl ether azeotrope and the extraction agent-propylene glycol dimethyl azeotrope on a side line of the separation tower. The method can be used for industrial production of propyleneepoxide.

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