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Separation process of water-propylene glycol monomethyl ether-propylene glycol ternary system

A technology of propylene glycol monomethyl ether and ternary system, which is applied in the field of separation engineering, can solve the problems of difficult ternary system separation, affect the efficiency of separation and purification, change the thermodynamic properties of ternary components, etc., and achieve the effect of efficient and reliable separation

Active Publication Date: 2021-12-07
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It has been reported to separate water and propylene glycol monomethyl ether binary azeotropic system by extraction and rectification coupling, but the water-propylene glycol monomethyl ether-1,2-propylene glycol ternary system contains a small amount of 1,2-propylene glycol, The small amount of 1,2-propanediol not only changes the thermodynamic properties of the ternary components, but also has different distributions in the extract phase and the raffinate phase, which affects the efficiency of subsequent further separation and purification. The separation of water and propylene glycol monomethyl ether binary system method is difficult to efficiently solve the separation of the ternary system, therefore, the present invention is also proposed based on this

Method used

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  • Separation process of water-propylene glycol monomethyl ether-propylene glycol ternary system
  • Separation process of water-propylene glycol monomethyl ether-propylene glycol ternary system

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Effect test

Embodiment 1

[0047] Using methyl tert-butyl ether as the extraction agent, the recycled methyl tert-butyl ether and the added fresh methyl tert-butyl ether are mixed, and then the heat exchange temperature is 5°C through the heat exchanger, and the flow rate is 100kg / h Pumped into the top of the extraction tower S1052, the WAT (water)-MME-PG mixed raw material is heat-exchanged to 5°C (the same value as the extractant) through a heat exchanger and pumped from the bottom of the extraction tower S1052. The number of stages of the extraction column S1052 is 35, and the operating temperature is the feed temperature. After extraction, the methyl tert-butyl ether and MME in the extraction phase flow out from the top of the extraction tower S1052, and 98% of the methyl tert-butyl ether and 97% of MME in the feed enter the overhead stream after extraction, with WAT 0.15% of PG and 0.01% of PG are brought out from the top of the tower. The raffinate phase is mainly WAT and PG, which flow out from ...

Embodiment 2

[0051] The extractant is 2,3-dimethylbutane, the recycled 2,3-dimethylbutane and the added fresh 2,3-dimethylbutane are mixed and then the heat exchange temperature is 35 °C, pumped into the top of the extraction tower S1052 at a flow rate of 3000kg / h, the WAT-MME-PG mixed raw material is heat-exchanged to 35 °C through a heat exchanger, and pumped from the bottom of the extraction tower S1052. The number of stages of the extraction column S1052 is 50, and the operating temperature is the feed temperature. After extraction, the 2,3-dimethylbutane and MME in the extraction phase flow out from the top of the extraction tower S1052, and 98% of the 2,3-dimethylbutane and 97% of the MME in the feed enter after extraction In the overhead stream, 0.15% of WAT and 0.01% of PG are carried out from the top of the tower. The raffinate phase is mainly WAT and PG, which flow out from the bottom of the extraction tower S1052. Compared with the feed materials of the extraction tower, 99.85%...

Embodiment 3

[0055] In this implementation, the extractant is 2-methylpentane, the heat exchange temperature is 20°C through the heat exchanger, and it is pumped into the top of the extraction tower S1052 at a flow rate of 1000kg / h, and the WAT-MME-PG mixed raw material is passed through the heat exchanger Exchange the heat to 20°C and pump it in from the bottom of the extraction tower S1052. The number of stages of the extraction column S1052 is 25, and the operating temperature is the feed temperature. After the extraction, the 2-methylpentane and MME of the extraction phase flow out from the top of the extraction tower S1052, and 98.5% of the 2-methylpentane and 97.6% of the MME in the feed enter the stream at the top of the tower after extraction, with 0.25% % WAT and 0.02% PG are brought out from the top of the tower. The raffinate phase is mainly WAT and PG, which flow out from the bottom of the extraction tower S1052. Compared with the feed materials of the extraction tower, 99.75%...

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Abstract

The invention relates to a separation process of a water-propylene glycol monomethyl ether-propylene glycol ternary system. The process comprises the following steps: (1) feeding a water-propylene glycol monomethyl ether-propylene glycol ternary mixture into an extraction tower, and extracting propylene glycol monomethyl ether by adopting an extraction agent to obtain an extraction phase and a raffinate phase; (2) feeding the obtained extraction phase into a first rectifying tower for rectification separation to obtain an extraction agent and propylene glycol monomethyl ether; and (3) feeding the obtained raffinate phase into a second rectifying tower to be subjected to rectification separation so as to obtain water and propylene glycol, wherein the water is distilled off from the tower top, and the propylene glycol is distilled off from the tower bottom after the purity of propylene glycol meets the requirement. Due to the fact that an existing liquid mixture obtained after the main product PO and the solvent methanol are separated contains a large amount of water and a small amount of propylene glycol monomethyl ether and propylene glycol, propylene glycol monomethyl ether and water form an azeotrope, and the problems that the separation difficulty is large, and the separation energy consumption is high are solved by adopting the separation technology, and the separation cost is low, so that he efficient separation of the ternary system is realized.

Description

technical field [0001] The invention belongs to the technical field of separation engineering and relates to a separation process of a water-propylene glycol monomethyl ether-propylene glycol ternary system. Background technique [0002] Propylene oxide is an important chemical raw material. It is a synthetic raw material for polyether polyol, propylene glycol, propylene glycol ether, dimethyl carbonate, polypropylene carbonate, nonionic surfactant, etc. It is an essential raw material for the polyurethane industry. It plays an important role in the chemical industry. The preparation of propylene oxide by one-step direct oxidation of propylene (HPPO method) is a clean and economical process technology route, and it is also listed as a new green technology for key development in my country. [0003] The product of propylene oxide produced by HPPO method has seven components: oxygen (formed by side reaction of hydrogen peroxide decomposition), propylene (excess unreacted prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C41/34C07C43/13C07C29/76C07C31/20
CPCC07C41/34C07C29/76C07C43/13C07C31/205
Inventor 曹贵平吕慧蔡乾相叔鑫
Owner EAST CHINA UNIV OF SCI & TECH