A method for liquid-liquid extraction-extractive distillation separation of propylene glycol methyl ether and water

A technology of propylene glycol methyl ether and extractive distillation, which is applied in the liquid-liquid extraction-extractive distillation separation of propylene glycol methyl ether and water in rectification towers, and in the field of liquid-liquid extraction-extractive distillation separation of propylene glycol methyl ether and water, to achieve Effects of high-purity separation and energy consumption reduction

Active Publication Date: 2020-06-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, there is no report about adopting liquid-liquid extraction-extractive distillation process to carry out propylene glycol methyl ether dehydration in the current patent and literature, so a new, energy-saving method for separating propylene glycol methyl ether and water binary azeotropic system is proposed. Great environmental significance and industrial value

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  • A method for liquid-liquid extraction-extractive distillation separation of propylene glycol methyl ether and water

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Effect test

Embodiment 1

[0042] In the liquid-liquid extraction tower with 10 trays, the propylene glycol methyl ether-water mixture with a flow rate of 1000 kmol / h enters from the first plate, and the feed contains 7.8mol% of water and 92.2mol% of propylene glycol methyl ether. The agent 2-ethylhexanoic acid enters from the 10th plate, the flow rate is 350 kmol / h, the temperature at the top of the tower is 45°C, and the temperature at the top of the tower is 40°C; the theoretical plate number of the extractive distillation column is 20, and the feed position of the mixture is 12 , the extraction agent 2-ethylhexanoic acid enters from the fifth plate, the flow rate is 60 kmol / h, the reflux ratio is 0.3, the temperature at the top of the tower is 95°C, and the temperature at the bottom of the tower is 175°C; the number of theoretical plates in the rectification column is 25, The number of feed plates is 17, the reflux ratio is 0.7, the temperature at the top of the tower is 120°C, and the temperature at...

Embodiment 2

[0045] In the liquid-liquid extraction tower with 12 trays, the propylene glycol methyl ether-water mixture with a flow rate of 1000 kmol / h enters from the first plate, with 7.8mol% water and 92.2mol% propylene glycol methyl ether in the feed, The extraction agent 2-ethylhexanoic acid enters from the 12th plate, the flow rate is 500 kmol / h, the temperature at the top of the tower is 40°C, and the temperature at the bottom of the tower is 35°C; the number of theoretical plates of the extractive distillation column is 18, and the feed position of the mixture is 10. The extraction agent 2-ethylhexanoic acid enters from the fourth plate, the flow rate is 80 kmol / h, the reflux ratio is 0.7, the temperature at the top of the tower is 100°C, and the temperature at the bottom of the tower is 178°C; the number of theoretical plates in the rectification column is 20 , the feed plate is 12, the reflux ratio is 1, the temperature at the top of the tower is 122°C, and the temperature at the...

Embodiment 3

[0048] In the liquid-liquid extraction tower with 8 trays, the propylene glycol methyl ether-water mixture of flow rate 1000kmol / h enters from the 1st plate, and the water content is 7.8mol% and propylene glycol methyl ether 92.2mol% in the feed, The extraction agent 2-ethylhexanoic acid enters from the eighth plate, the flow rate is 550 kmol / h, the temperature at the top of the tower is 48°C, and the temperature at the bottom of the tower is 42°C; the number of theoretical plates of the extractive distillation column is 20, and the feed position of the mixture is 12. The extraction agent 2-ethylhexanoic acid enters from the third plate, the flow rate is 100 kmol / h, the reflux ratio is 1.0, the temperature at the top of the tower is 105°C, and the temperature at the bottom of the tower is 180°C; the number of theoretical plates in the rectification column is 20 , the feed plate is 12, the reflux ratio is 1.2, the temperature at the top of the tower is 115°C, and the temperature...

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Abstract

The invention relates to a method for separating propylene glycol methyl ether from water through liquid-liquid extraction-extraction distillation, and a device applicable to the method. The method comprises the following steps: firstly, performing liquid-liquid extraction on an aqueous solution with 7.8mol% of propylene glycol methyl ether by using an extraction agent, namely 2-ethylhexoic acid, when the purity of raffinate water at the bottom of a liquid-liquid extraction tower is up to 99.9mol% or above, conveying the raffinate to an extraction distillation tower, and performing extraction distillation; and adding the extraction agent, namely the 2-ethylhexoic acid into the upper part of an extraction distillation tower, collecting water from the tower top, collecting a mixed liquid of 2-ethylhexoic acid and propylene glycol methyl ether, and conveying the mixed liquid to a distillation tower for separation, wherein a product collected from the top of the distillation tower is propylene glycol methyl ether, the purity of the propylene glycol methyl ether is up to 99.9mol% or above, and the tower bottom extraction agent, namely the 2-ethylhexoic acid can be recycled. The device mainly comprises a liquid-liquid extraction tower (LET), an extraction distillation tower (EDT), a distillation tower (DT), condensers (C1), (C2) and (C3), return tanks (D1) and (D2), reboilers (R1) and (R2), a mixer (Mix) and a diverter (Fs).

Description

【Technical field】 [0001] The invention belongs to the field of separation and purification in the chemical industry, and specifically relates to a method for separating propylene glycol methyl ether and water through liquid-liquid extraction-extractive distillation. Extraction tower, then adopt extractive rectification tower, rectification tower liquid-liquid extraction-extractive rectification to separate the method of propylene glycol methyl ether and water. 【Background technique】 [0002] Propylene glycol methyl ether (PM) is an important "universal solvent", detergent, emulsifier, and can also undergo esterification with acetic acid to form one of the most commonly used esters with high industrial demand in surface coatings Propylene glycol methyl Ether acetate, water are by-products of this reaction. Therefore, the dehydration of propylene glycol methyl ether is an important and necessary operation in this process. The separation process is the most energy-consuming l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/42C07C43/13
CPCC07C41/42C07C43/13
Inventor 王英龙赵婷然秦斌白文婷朱兆友
Owner QINGDAO UNIV OF SCI & TECH
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