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Process for making monomer solution for making cation exchange membranes

A monomer solution and solution technology, applied in the direction of final product manufacturing, chemical instruments and methods, sustainable manufacturing/processing, etc., can solve problems such as difficult ultra-high capacity

Active Publication Date: 2013-08-07
SIEMENS WATER TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0026] All the above examples illustrate that the currently used general scheme of styrene sulfonate has limited solubility in solvents and thus it is difficult to obtain ultra-high capacity, high efficiency and low water content CEMs based on all the above

Method used

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  • Process for making monomer solution for making cation exchange membranes
  • Process for making monomer solution for making cation exchange membranes
  • Process for making monomer solution for making cation exchange membranes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] Preparation of styrene sulfonic acid pyridine and CEM

[0080] In an 8 oz jar, 61.1 g of NaSS, 29.92 g of pyridine hydrochloride, 44.38 g of NMP, 47.25 g of DVB-80, and 0.42 g of MEHQ were added. The mixture was heated to 76°C and refluxed for 100 minutes, then slowly cooled under stirring for 18 hours, and then filtered at 15°C using a vacuum pump suction. Output: 133.45 g of clear yellow-green solution. The filtered NaCl was dried in an oven at 90°C for 70 hours; weighing: 41.68 g.

[0081] 0.35 gm of Vazo-64 (DuPont) was added to 50.43 g of the solution obtained above. The samples of Teklon HPIP, APorous H6A, Celgard EZ2090, Celgard EZ2590, Solupor 10P05A and Solupor 16P10A were immersed for 45 minutes respectively, and then they were sandwiched between Mylar discs, and any bubbles in the sandwich were removed by squeezing. Place the interlayer in an aluminum weighing pan, and put the weighing pan into a Ziploc® or similar expandable plastic bag, pressurize with nitrog...

Embodiment 2

[0088] CEM prepared from a mixture of PySS, 2-SEM DVB, AA and NMP:

[0089] In a 40 ml glass bottle containing 7.38 g of acrylic acid, dissolve 7.6 g of NMP, add 7.4 g of DVB-80 and 0.15 g of Vazo-64 (DuPont) to obtain a completely transparent light yellow solution.

[0090] To 20.09 g of the solution from Example 1 doped with Vazo-64, 2.6 g of the above solution and 3.10 g of 2-SEM (2-sulfoethyl methacrylate, Evan Chemetics) were added. Stir at room temperature until homogeneous mixture. Then sandwich the samples of Tekion HPIP, APorous H6A, Celgard EZ2090, Celgard EZ2590, Solupor 10P05A and Solupor 16P10A between Mylar discs, and squeeze to remove any bubbles in the sandwich. The sandwich is placed in an aluminum weighing pan, and the weighing pan is placed in a Ziploc™ bag and pressurized with nitrogen. The Ziploc™ bag was placed in an oven at 90°C for 45 minutes.

[0091] Each film sample thus prepared was placed in 0.5N NaCl(aq) to adjust. The Solartron electrochemical teste...

Embodiment 3

[0096] Synthesis of styrene sulfonic acid pyridine (PySS)

[0097] Add 50.22 g of NaSS, 26.40 g of pyridine hydrochloride, and 26.30 g of NMP to an 8 oz jar. The solution was heated at 40-75°C for 6 hours under stirring and reflux, and then slowly cooled under stirring for 18 hours. The precipitated NaCl is filtered out using a vacuum pump suction device at room temperature. Output: 61 g of clear yellow-green solution. The filter cake weighed 31.10 g after being dried in an oven at 80°C for 6 days.

[0098] The clear yellow-green solution was kept in the refrigerator overnight, forming some flaky crystals. The crystals were filtered using a vacuum pump suction device; 58.5 g of remaining solution and 2.6 g of precipitated crystals were obtained.

[0099] In this example, 0.244 mol of NaSS was initially present. If MW = 183.2 in terms of sulfonate ion, then there is 73% sulfonate in 61.1 g of the final clear solution.

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Abstract

A method of making a monomer solution of styrene sulfonic acid or the pyridine salt of styrene sulfonic acid or mixtures of both in an organic solvent, said solution being suitable for producing cation exchange membranes. The method comprises the steps of dissolving a metal salt of styrene sulfonate in said organic solvent and pyridinium styrene sulfonate. The mixture solution is reacted under conditions that generate a salt byproduct precipitate and the reactant product solution is collected. Embodiments of the present invention provide for cation exchange membranes and processes for their manufacture. Membranes made by the processes described herein combine low resistance and high permselectivity which make them highly effective for membrane components in desalination of water by electrodialysis (ED), as a power generating sources in reverse electrodialysis and as separators in fuels cells.

Description

[0001] This application claims the priority of U.S. Provisional Applications 61 / 393770 and 61 / 393754 filed on October 15, 2010. Technical field [0002] Embodiments of the present invention provide methods for preparing monomer-containing solutions suitable for manufacturing cation exchange membranes, and cation exchange membranes manufactured from these solutions and methods for manufacturing the same. Background technique [0003] Cation exchange membranes transport cations under electrical or chemical potential. The cation exchange membrane will have a fixed negative charge as well as moving positively charged cations. The characteristics of ion exchange membranes are controlled by the amount, type and distribution of fixed ion groups. Strong acid cation exchange membranes usually contain sulfonic acid groups as charged groups, while for weak acid membranes, carboxylic acids typically constitute fixed charged groups. [0004] The most important applications of ion exchange memb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00
CPCB01D2323/36B01D61/422B01D67/0006B01D2323/345B01D2325/42C08J5/2275H01M8/1069B01D2323/34B01D71/28B01D71/82H01M2300/0082C08J5/2206B01D69/10H01M8/1018B01D69/106B01D69/107Y02A20/124Y02P70/50
Inventor J.R.林
Owner SIEMENS WATER TECH CORP
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