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Ionic polymer membranes

A technology of ionic polymers and compositions, applied in membrane technology, separation methods, semi-permeable membrane separation, etc., can solve problems such as insufficient inherent efficiency of single distillation

Inactive Publication Date: 2007-08-01
BP CORP NORTH AMERICA INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the vapor / liquid equilibrium line is close to the operating line of the McCabe-Thiele diagram, the inherent efficiency of a single distillation is not sufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] The examples show the preparation of polymer compositions from copolymers of polyvinylpyrrolidone and polyvinyl acetate (PVP-VAc). The copolymer was purchased from Aldrich Chemical Company, Milwaukee WI 53566 USA (Cat. No. 19,084-5). The average molecular weight (Mw) of the polymer was 50,000 and consisted of 1 / 1 wt / wt vinylpyrrolidone and vinyl acetate (ratio pyrrolidone / acetate molar ratio 1.3 / 1). The polymer was dried in a vacuum oven at 40°C for 16 hours.

[0090] A 2.27 gram portion of dry copolymer and 9.0 grams of methanol were placed in a 20 ml vial. Cap and shake the vial for one hour to obtain a clear solution of copolymer in methanol. Next, 1.0 mL aliquots of the clear solution were added to four 2 mL tared vials. The open vial was placed on a hot plate at 40°C for 18 hours, during which time the methanol solvent was allowed to evaporate slowly. A clear film formed on the bottom of the vial and was identified as PVP-VAc copolymer. The vials were cooled i...

Embodiment 2

[0092] This example measures the non-selective absorption of toluene / isooctane mixtures on polyvinylpyrrolidone and polyvinyl acetate (PVP-VAc) copolymer films prepared according to Example A.

[0093] A 1 / 1 v / v mixture of toluene and isooctane (both HPLC grade from Aldrich) was prepared. To each of the four vials containing the PVP-VAc film prepared in Example A, approximately 0.3 grams of the liquid mixture was added. Reweigh the vial to four decimal places and calculate the net weight of the liquid added. A measured amount of the toluene / iso-octane mixture was added to each of the four vials (average g liquid / g solid 0.357 g / g). Close the vial tightly and shake vigorously for one minute. Allow vials to stand at room temperature for 48 hours. There was no significant change in vial weight indicating less than about 2% evaporation. The refractive indices of the four supernatants were measured and found to average 1.44177 (range of + / - 0.0002) at 21.98°C. Simultaneously, ...

Embodiment 3

[0095] This example demonstrates the preparation of polymer compositions from copolymers of polyvinylpyrrolidone and polyvinyl acetate (PVP-VAc).

[0096] A 3.0 gram portion of dry copolymer and 20 mL of methanol were placed in a 20 mL vial. The mixture was shaken at room temperature for one hour to obtain a clear methanol solution of the copolymer. Next, add 0.84 mL of 70% nitric acid (13.0 mmol HNO 3 ) into a clear solution and the mixture was stirred for two hours using a small magnetic stir bar. An aliquot (2.0 mL) of the solution was added to a tared 10 mL glass vial and the solvent was evaporated under vacuum on a hot plate at approximately 70°C to 80°C for four hours to form a solid ionic polymer. The vial was cooled, then 2 mL of methanol was added to redissolve the solid ionomer. The vial was then placed on a hot plate at approximately 40°C to 50°C overnight (14 hours) to obtain a clear, pale yellow ionomer film at the bottom of the vial, determined as (PVP-VAc) / HN...

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Abstract

Compositions and processes are disclosed for economical separation of fluid mixtures. Broadly, the present invention discloses ionic polymer compositions that are useful for perm-selective membrane separations. More particularly, ionic polymers of the invention comprise a plurality of repeating structural units having as a constituent part thereof organic ionic moieties consisting of nitrogen containing anions and / or cations. In the form of non-porous membranes, ionic polymers of the invention facilitate recovery of purified organic and inorganic products from fluid mixtures by means of perm-selective membrane separations. The present invention also provides methods for forming the ionic polymers, for example by treating selected nitrogen-containing organic polymers with acids, or treating a polymeric material comprising a plurality of carboxylate groups with an amine. Ionic polymer compositions of the invention are particularly useful for simultaneous recovery of a permeate product of an increased concentration, and a desired non-permeate stream, from a fluid mixture containing at least two compounds of different boiling point temperatures.

Description

technical field [0001] The present invention relates to ionic polymer compositions for use in permselective membrane separations. More specifically, the ionic polymers of the present invention comprise a plurality of repeating structural units having as their constituent organic ionic moieties composed of nitrogen-containing anions and / or cations. In the form of non-porous membranes, the ionic polymers of the present invention are separated by permselective membranes, allowing easy recovery of purified organic and inorganic products from mixed liquids. [0002] The ionic polymer compositions of the present invention are particularly useful for simultaneously recovering a permeate product of increased concentration and a desired non-permeate stream from a fluid mixture comprising at least two compounds of different boiling temperatures. [0003] As described in more detail below, the present invention provides methods of forming ionic polymers, such as by treating selected nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D71/64
CPCB01D71/82B01D53/228B01D71/56
Inventor 杰弗里·T·米勒乔治·A·小赫夫威廉·约翰·科罗什查尔斯·理查德·霍平
Owner BP CORP NORTH AMERICA INC
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