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Purification method of propylene oxide

A technology of propylene oxide and purification method, applied in the direction of distillation purification/separation, organic chemistry, etc., which can solve the problems of increased loss rate of propylene oxide, increased hydrolysis of propylene oxide, small scale, etc.

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

[0013] In summary, the washing method can reduce the diol content in the extractant, but because the liquid-liquid phase separation requires a long residence time, the efficiency of liquid-liquid extraction is low, which will increase the loss of the extractant, and the washing method will increase the hydrolysis of propylene oxide. The loss rate of propylene oxide increases; in addition, because diol has a high boiling point and forms an azeotrope with the extractant, the extraction agent is separated by distillation to increase equipment investment, and the energy consumption is high. From an economic point of view, the economic benefit is low; Adsorption and static separation methods have the problems of low efficiency and small scale; extraction separation methods have the problem of extractant purification
Moreover, since heavy component impurities such as alcohol ethers have low solubility in water and do not form azeotropes with the extractant, the loss of the extractant is relatively large through the method of cyclic enrichment

Method used

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  • Purification method of propylene oxide
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] according to figure 1 In the shown process flow, the extraction agent is n-octane, and in the feed stream containing 1,2-propylene oxide, the extraction agent and the heavy component impurities, the ratio of the extraction agent to 1,2-propylene oxide is calculated as a percentage by weight The ratio is 6:1, the number of theoretical plates in the separation column is 20, and the first theoretical plate above the return port of the reboiler is drawn from the side line of the separation column. The operating pressure of the separation tower is 0.10MPaA, the temperature is 34.1°C, the azeotrope azeotrope temperature of the side-line extraction is 112.8°C, the diol content is 6.86wt%, the side-line diol is enriched and extracted, and the second heavy component impurity stream at the bottom of the extractant purifier enrichment extraction. Separation tower reboiler B adopts thermosiphon type reboiler, extractant purifier E is kettle type reboiler, and the ratio of heat exc...

Embodiment 2

[0085] according to figure 1 Shown in the process flow diagram, the extractant is n-octane, and in the feed stream containing 1,2-epoxy propylene, the extractant and the heavy component impurity stream, the extractant and 1,2-epoxy propylene are measured in weight percentages. The ratio is 6:1, the number of theoretical plates in the separation column is 30, and the second theoretical plate above the return port of the reboiler is drawn from the side line of the separation column. The operating pressure of the separation tower is 0.16MPaA, the temperature is 47.9°C, the azeotrope azeotrope temperature of the side-line extraction is 134.8°C, the diol content is 8.14wt%, the side-line diol is enriched and extracted, and the second heavy component impurity stream at the bottom of the extractant purifier enrichment extraction. Separation tower reboiler B adopts thermosiphon type reboiler, extractant purifier E is kettle type reboiler, and the ratio of heat exchange area between r...

Embodiment 3

[0088] according to figure 1 Shown in the process flow diagram, the extractant is n-octane, and in the feed stream containing 1,2-epoxy propylene, the extractant and the heavy component impurity stream, the extractant and 1,2-epoxy propylene are measured in weight percentages. The ratio is 6:1, the number of theoretical plates of the separation column is 40, and the second theoretical plate above the return port of the reboiler is drawn from the side line of the separation column. The operating pressure of the separation tower is 0.32MPaA, the temperature is 71.1°C, the azeotrope azeotrope temperature of the side-line extraction is 159.8°C, the glycol content is 10.63wt%, the side-line glycol is enriched and extracted, and the second heavy component impurity stream at the bottom of the extractant purifier enrichment extraction. Separation tower reboiler B adopts thermosiphon type reboiler, extractant purifier E is kettle type reboiler, and the ratio of heat exchange area betw...

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Abstract

The invention relates to a method for purifying propylene 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 increases, the yield of propylene oxide is low, and the energy consumption is high. The process includes providing a feed stream containing propylene oxide, an extractant, and impurities including 1,2-propylene glycol; the feed stream enters a separation column having a first reboiler; Operate under the condition of forming an azeotrope with 1,2-propylene glycol; Draw the first stream containing extractant and 1,2-propylene glycol azeotrope in the side line of the separation tower, and obtain the second stream containing extractant in the tower still , the top of the tower obtains the third stream containing propylene oxide; at least a part of the second stream enters the extractant purifier, and the obtained gas phase light component fourth stream returns to the separation tower, and the liquid phase first heavy component impurity stream Go post-processing. The method can be used in the industrial production of propylene oxide.

Description

technical field [0001] The invention relates to a method for purifying propylene oxide, in particular to a method for purifying propylene oxide by extracting and rectifying an extraction agent. Background technique [0002] Propylene oxide is mainly used in the production of polyether polyols, propylene glycol, polyurethane, degradable plastics, isopropanolamine, etc. It is also the fourth generation of nonionic surfactants, demulsifiers, plasticizers, flame retardants, lubricants, Main raw material of pesticide emulsifier, etc. It is widely used in surfactants, food, tobacco, medicine and cosmetics and other industries. It is an important raw material for fine chemicals and has a broad market in the future. [0003] At present, the domestic industrial production routes of propylene oxide mainly include chlorohydrin method, isobutane co-oxidation method, ethylbenzene co-oxidation method, and hydrogen peroxide method. At present, the chlorohydrin method accounts for a high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/32C07C7/06C07C9/15
Inventor 胡松胡帅李晗杨卫胜
Owner CHINA PETROLEUM & CHEM CORP