Method of separating olefins/alkanes via Cu(I)/eutectic solvent supporting liquid membrane

A technology of deep eutectic solvent and supporting liquid membrane, which is applied in separation methods, semi-permeable membrane separation, and dispersed particle separation, etc., and can solve the problems of low volatility of deep eutectic solvent, membrane liquid contamination of separated components, and loss of membrane liquid and other problems, to achieve the effect of low cost, high volatility, and large olefin permeation flux

Inactive Publication Date: 2017-10-20
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention is beneficial to the low volatility and high stability of the deep eutectic solvent, and over

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Accurately weighed 5.7462g of ethylamine hydrochloride was placed in a single-necked bottle, and 12.9793g of glycerol was added at a molar ratio of 1:2, and magnetically stirred at 60°C for 4 hours to obtain a colorless and transparent deep eutectic solvent. Accurately weigh 3 mL of ethylamine hydrochloride-glycerol deep eutectic solvent, add 0.891 g of CuCl, and stir magnetically at 60° C. for 4 hours to obtain 3 mol / L CuCl / active deep eutectic solvent. Spread the above-mentioned deep eutectic solvent evenly on an area of ​​19.625cm 2 On the PVDF circular diaphragm, a eutectic support liquid film was prepared under a transmembrane pressure of 1.0 bar. The prepared liquid film was used to separate the ethylene / ethane mixture. The operating conditions were ethylene gas 30mL / min, ethane 30mL / min, makeup gas N 2 20mL / min, transmembrane pressure difference 0.1bar, operating temperature 298.15K, the test results: ethylene flux 142Barrer, ethane 7.39Barrer, separation selec...

Embodiment 2

[0039] Accurately weighed 5.1145 g of ethylamine hydrochloride was placed in a single-necked bottle, and 9.6576 g of glycerol was added at a molar ratio of 1:2, and magnetically stirred at 60°C for 4 hours to obtain a colorless and transparent deep eutectic solvent. Accurately weigh 3 mL of ethylamine hydrochloride-glycerol deep eutectic solvent, add 1.188 g of CuCl, and stir magnetically at 60° C. for 4 hours to obtain 4 mol / L CuCl / active deep eutectic solvent. Spread the above-mentioned deep eutectic solvent evenly on an area of ​​19.625cm 2 On the PVDF circular diaphragm, a eutectic support liquid film was prepared under a transmembrane pressure of 1.0 bar. The prepared liquid film was used to separate the ethylene / ethane mixture. The operating conditions were ethylene gas 30mL / min, ethane 30mL / min, makeup gas N 2 20mL / min, transmembrane pressure difference 0.1bar, operating temperature 298.15K, the test results: ethylene flux 158Barrer, ethane 5.11Barrer, separation sele...

Embodiment 3

[0041]Accurately weighed 12.599g of ethylamine hydrobromide was placed in a single-necked bottle, and 9.209g of glycerol was added at a molar ratio of 1:1, and magnetically stirred at 60°C for 4 hours to obtain a colorless and transparent deep eutectic solvent. Accurately weigh 3mL of ethylamine hydrobromide-glycerol deep eutectic solvent, add 0.891g CuCl, and stir magnetically at 60°C for 4h to obtain 3mol / L CuCl / active deep eutectic solvent. Spread the above-mentioned deep eutectic solvent evenly on an area of ​​19.625cm 2 On a nylon circular diaphragm, a eutectic support liquid membrane was prepared under a transmembrane pressure of 1.2bar. The prepared liquid membrane was used to separate the ethylene / ethane mixture. The operating conditions were ethylene gas 30mL / min, ethane 30mL / min, makeup gas N 2 20mL / min, transmembrane pressure difference 0.1bar, operating temperature 298.15K, the test results: ethylene flux 98.5Barrer, ethane 7.5Barrer, separation selectivity 13.1....

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Abstract

The invention provides a method of separating olefins/alkanes, comprising the steps of (1) mixing a hydrogen bond receptor and a hydrogen bond donor in a suitable ratio to prepare a eutectic solvent; (2) dissolving a cuprous salt in the eutectic solvent prepared in step (1) to prepare an active eutectic solvent containing the cuprous salt; (3) applying the active eutectic solvent containing the cuprous salt prepared in step (2) evenly to a porous organic supporting membrane, and preparing the Cu(I)/eutectic supporting liquid membrane by a pressurizing method; (4) using the eutectic supporting liquid membrane prepared in step (3) to separate olefins/alkanes. The active membrane liquid with high support concentration is acquired herein by changing the types of cations, anions and hydrogen bond donor in a eutectic system and changing the ratio of the hydrogen bond donor and hydrogen bond receptor to adjust the dissolvability of the cuprous salt therein. Unique hydrogen bond network and proton environment in the eutectic solvent are used to stabilize a support, so that long-term stability of the supporting liquid membrane is ensured.

Description

technical field [0001] The invention belongs to the technical field of gas separation membranes, and in particular relates to a method for separating olefins / alkanes by using a Cu(I) / deep eutectic solvent to support a liquid membrane. Background technique [0002] Olefin / alkane separation occupies an important position in the field of gas separation, because olefins, as important chemical raw materials, are used in the synthesis of various chemical products. However, olefin / alkane separation is very challenging because of their similar physicochemical properties, eg, similar molecular structure, similar boiling point, similar solubility. Due to its reliability and availability, cryogenic distillation is currently the most widely used olefin / alkane separation technology. However, the cryogenic rectification separation process requires huge operating and equipment costs. Therefore, it is of great significance to explore and develop more energy-saving and more efficient olefi...

Claims

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Application Information

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IPC IPC(8): B01D53/22B01D67/00B01D69/10B01D71/34B01D71/56
CPCB01D53/228B01D67/0088B01D69/10B01D71/34B01D71/56
Inventor 姜斌徐咪窦浩桢肖晓明
Owner TIANJIN UNIV
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