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Process for concentrating at least one chemical from liquid or gaseous mixtures using a membrane comprising fluoropolymer and hydrophobic silica particles

A technology of fluoropolymers and mixtures, applied in chemical instruments and methods, separation methods, membrane technology, etc., can solve the problems of zeolite membrane redundancy

Inactive Publication Date: 2015-06-24
CLARIANT INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, fabricating such zeolite membranes is tedious and requires multiple fabrication steps, expertise, and machinery

Method used

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  • Process for concentrating at least one chemical from liquid or gaseous mixtures using a membrane comprising fluoropolymer and hydrophobic silica particles
  • Process for concentrating at least one chemical from liquid or gaseous mixtures using a membrane comprising fluoropolymer and hydrophobic silica particles
  • Process for concentrating at least one chemical from liquid or gaseous mixtures using a membrane comprising fluoropolymer and hydrophobic silica particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] Embodiment 1: the manufacture of PTFE-zeolite composite material

[0114] Mix 25g of PTFE dispersion (about 60% PTFE, Sigma Aldrich) with 150g of zeolite powder (ZSM-5, H-type; SiO 2 / Al 2 o 3 >800; Süd-Chemie AG, Germany; now: Clariant Produkte (Deutschland) GmbH) mixed and treated in a Werner & Pfleiderer LUK 075 laboratory kneader at 90°C for 45 minutes to fibrillate the PTFE and form a dust-free mixture.

[0115] After the kneading step, the mat-like product was biaxially calendered at 50° C. to a film of 0,5 mm thickness using a Fetzel two-roll calendering system.

Embodiment 2

[0116] Example 2: Lamination of a PTFE layer to the membrane of Example 1

[0117] Five layers of PTFE membranes (thickness 45 μm) were stacked and placed on both sides of the membrane of Example 1 and used a Fetzel two-roll calendering system with a roll opening of 0,6 mm in one pass at 0,6 to 0,8 m / The calendering was performed at a slower feed rate of s to obtain a sandwich membrane system with a thickness of 0,75 mm. 80 mm diameter circular samples were punched out of this material for testing.

Embodiment 3

[0118] Example 3: Pervaporation experiment using 5% ethanol solution

[0119] 1 liter of 5% w / w ethanol in water was added to the storage device and pumped therefrom at a flow rate of 4 L / min onto the membranes fabricated as described in Examples 1 and 2. Pump the retentate back into storage. The temperature of the storage device was maintained at 60 °C using a thermal jacket. On the other side of the membrane, a vacuum is applied using a vacuum pump. The absolute pressure was kept constant at 10 mbar. The permeate was coagulated using two cold hydrazines cooled with liquid nitrogen. The experimental setup is as figure 1 shown in .

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Abstract

Process for concentrating at least one chemical from a liquid or gaseous feed mixture comprising the steps (a) contacting a liquid or gaseous feed mixture with a first surface of a composite membrane having two surfaces, wherein said feed mixture comprises - at least one gaseous or liquid diluent and - at least one chemical having a vapour pressure in pure form of 0.8 mbar or more at 20 °C, and wherein said composite membrane consists of (i) a matrix of a fluoropolymer in the form of fibrils, wherein said fluoropolymer has a content of tetrafluoroethylene repeating units of at least 90 mol-% relative to the total amount of repeating units, (ii) hydrophobic siliceous particles enmeshed into said matrix, (b) applying reduced pressure to the second surface of the composite membrane which is opposite to the first surface in contact with the feed mixture such that a permeate mixture is obtained on said second surface of the composite membrane, wherein said permeate mixture has a higher content of said at least one organic component and / or hydrogen than said feed mixture; (c) collecting said permeate mixture.

Description

technical field [0001] The present invention relates to a method for the enrichment of organic components from liquid or gaseous mixtures using composite membranes comprising fibril-forming fluoropolymers and hydrophobic siliceous particles. Background technique [0002] Separation of liquid or gaseous mixtures has been performed for decades for many commercial and industrial applications. Examples are chromatographic or preparative separations (HPLC, GC), drying of gases and liquids by porous hydrophilic desiccants, selective adsorption and desorption by hydrophobic adsorbents (e.g., zeolites), and by vapor permeation or permeation Evaporated gas or liquid separation. [0003] According to the state of the art, pervaporation has been achieved in two classical ways, namely by means of membranes composed of a) polymers or b) ceramic zeolites, or porous silica membranes. The osmotic control of the different permeating substances according to two different models and dependin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/32B01D69/14C12P7/16B01D53/22
CPCB01D53/228B01D69/12B01D69/147B01D69/148B01D71/32B01D71/36B01D2256/16B01D2257/70B01D2257/80B01D61/362B01D69/1213B01D69/1216B01D71/0281B01D71/04
Inventor A·科赫M·扎夫热尔D·登内瓦尔德
Owner CLARIANT INT LTD