Refining method and device for alkylene oxide

A technology of alkylene oxide and refining method, which is applied in the direction of organic chemistry, can solve the problems of high cost, small processing capacity, troublesome adsorption and analysis process, etc., and achieve the effects of reducing energy consumption, improving the purity of the extractant, and increasing the yield

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cost of this method is high, the adsorption and analysis process will be more troublesome, and the processing volume is not large

Method used

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  • Refining method and device for alkylene oxide
  • Refining method and device for alkylene oxide
  • Refining method and device for alkylene oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] according to figure 1 In the process flow shown, the extractant is n-octane, and the crude product stream containing 1,2-epoxybutane and the extractant stream containing n-octane enter the first rectification tower. In terms of molar percentage, the ratio of extractant to 1,2-epoxybutane is 8:1, the separation column reboiler E adopts a thermosiphon reboiler, and the extractant purifier F is a thermosiphon reboiler. The heat exchange area ratio of reboiler E and reboiler F is 5:1, and the part of the third stream entering the extractant purifier is 3% of the weight of the third stream.

[0109] The operating conditions of the first rectification tower are: pressure 0.042MPaG, tower top temperature 75°C.

[0110] The operating conditions of the second rectification tower are: pressure 0.04MPaG, tower top temperature 60°C.

[0111] The operating conditions of the separation tower are: pressure 0.04MPaG, tower top temperature 45°C.

[0112] The purity of the 1,2-butylen...

Embodiment 2

[0114] according to figure 1 In the process flow shown, the extractant is n-octane, and the crude product stream containing 1,2-epoxybutane and the extractant stream containing n-octane enter the first rectification tower. In terms of molar percentage, the ratio of extractant to 1,2-epoxybutane is 7:1, the separation tower reboiler E adopts a thermosiphon reboiler, and the extractant purifier F is a kettle-type reboiler, and then The heat exchange area ratio of the boiler E and the reboiler F is 5:1, and the part of the third stream entering the extractant purifier is 5% of the weight of the third stream.

[0115] The operating conditions of the first rectification tower are: pressure 0.10MPaG, tower top temperature 60°C.

[0116] The operating conditions of the second rectification tower are: pressure 0.09MPaG, tower top temperature 52°C.

[0117] The operating conditions of the separation tower are: pressure 0.09MPaG, tower top temperature 45°C.

[0118] The purity of the...

Embodiment 3

[0120] according to figure 1 In the process flow shown, the extractant is n-octane, and the crude product stream containing 1,2-epoxybutane and the extractant stream containing n-octane enter the first rectification tower. In terms of molar percentage, the ratio of extractant to 1,2-epoxybutane is 6:1, the separation tower reboiler E adopts a thermosyphon reboiler, and the extractant purifier F is a kettle-type reboiler, and then The heat exchange area ratio of the boiler E and the reboiler F is 5:1, and the part of the third stream entering the extractant purifier is 8% of the weight of the third stream.

[0121] The operating conditions of the first rectification tower are: pressure 0.20MPaG, tower top temperature 50°C.

[0122] The operating conditions of the second rectification tower are: pressure 0.19MPaG, tower top temperature 48°C.

[0123] The operating conditions of the separation tower are: pressure 0.18MPaG, tower top temperature 45°C.

[0124] The purity of the...

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Abstract

The invention relates to a method and device for refining alkylene oxide, which mainly solves the problems in the prior art that the accumulation of impurities in heavy components causes the purity of the extractant to decrease, the loss to increase, the yield of alkylene oxide to decrease, and the energy consumption to increase. The refining method includes: a) the crude product stream containing alkylene oxide and the extractant stream enter the first rectification tower, the top of the tower obtains the crude impurity stream, and the bottom of the tower obtains the first crude extractant stream; b) the second A crude extractant stream enters a separation tower with a first reboiler, the top of the tower obtains an alkylene oxide product, and the bottom of the tower obtains a third stream; c) at least a part of the third stream enters an extractant purifier, and the obtained The light components in the gas phase are returned to the separation tower, and the impurities in the heavy components in the liquid phase are sent for post-processing.

Description

technical field [0001] The invention relates to a method and device for refining alkylene 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. It is estimated that by 2020, the production capacity of propylene oxide will reach 12 million tons / year, and the demand will reach 10 million tons / year. In the long...

Claims

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Application Information

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