WO1994005841A1 - Fibrides contenant du charbon actif - Google Patents

Fibrides contenant du charbon actif Download PDF

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Publication number
WO1994005841A1
WO1994005841A1 PCT/US1992/007425 US9207425W WO9405841A1 WO 1994005841 A1 WO1994005841 A1 WO 1994005841A1 US 9207425 W US9207425 W US 9207425W WO 9405841 A1 WO9405841 A1 WO 9405841A1
Authority
WO
WIPO (PCT)
Prior art keywords
fibrids
adsorbent
activated carbon
polymeric
surface area
Prior art date
Application number
PCT/US1992/007425
Other languages
English (en)
Inventor
Thomas Irvin Bair
Original Assignee
E.I. Du Pont De Nemours And Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to IL10233892A priority Critical patent/IL102338A/en
Priority to ZA924892A priority patent/ZA924892B/xx
Priority to CA002142824A priority patent/CA2142824C/fr
Priority to JP6507137A priority patent/JP2747373B2/ja
Priority to DE69225909T priority patent/DE69225909T2/de
Priority to MX9203867A priority patent/MX9203867A/es
Application filed by E.I. Du Pont De Nemours And Company filed Critical E.I. Du Pont De Nemours And Company
Priority to EP92919821A priority patent/EP0656964B1/fr
Priority to PCT/US1992/007425 priority patent/WO1994005841A1/fr
Priority to KR1019950700725A priority patent/KR100219098B1/ko
Priority to AU25783/92A priority patent/AU670412B2/en
Priority claimed from CA002142824A external-priority patent/CA2142824C/fr
Publication of WO1994005841A1 publication Critical patent/WO1994005841A1/fr
Priority to US08/401,326 priority patent/US5482773A/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28028—Particles immobilised within fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/425—Cellulose series
    • D04H1/4258—Regenerated cellulose series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/43—Acrylonitrile series
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4326—Condensation or reaction polymers
    • D04H1/435—Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides

Definitions

  • nonwoven sheets of synthetic polymeric fibrids and short length 5 staple fibers are known from U.S. Patent No. 2,999,788.
  • the fibrids are prepared by shear precipitation of solutions of the polymer, preferably in an aqueous medium which extracts the polymer solvent and causes the polymer to come out of solution.
  • the fibrids are readily converted into paper by paper-forming techniques similar to those o employed with wood pulp.
  • Activated carbon is well-known to be useful in removing impurities from air, water and solvents because of its very high microporous surface area (>500 m ⁇ /g).
  • beds of loose carbon are commonly used for removing impurities from gaseous and liquid streams.
  • 5 fibrous systems e.g. felts, papers
  • carbon is mechanically entrained or adhesively attached
  • Fibrous systems employing mechanically entrapped carbon particles are invariably "dirty". That is, the fibrous matrix sheds small particles when pulsed, shaken, or “worked". The shed particles are messy and can interfere with 0 electrical equipment because they are conductive.
  • low porosity fibrous sheets can be bonded to the face of the fibrous system or the fibrous system can be impregnated with a resin.
  • Non-shedding, high porosity structures can be obtained by affixing carbon particles to the fibers of high-loft non-wovens with an adhesive.
  • the adhesive reduces the activity of the carbon.
  • the method is suitable only for a highly open porous fiber matrix wherein the carbon particles can penetrate o into the center of the structure.
  • FIG. 1 is a plot of CCI4 adsorption activity in percent versus surface area in square meters per gram.
  • This invention provides adsorbents comprising polymeric fibrids containing embedded activated carbon. Also encompassed are wet-laid composite sheet structures comprising papers of such fibrids with or without short staple fibers, or mats of such fibrids and fiber fluff and composite sheet structures formed by hydrolacing such fibrids with synthetic fibers.
  • the fibrids of the invention preferably contain from about 40 to 85 weight percent, more preferably at least 65 weight percent of activated carbon and have a surface area of at least 200 m 2 /g. Also encompassed by this invention are processes of using the fibrids.
  • This invention provides activated carbon-loaded fibrids which have high surface area and adsorption activity.
  • the fibrids can be tightly bound in fibrous articles especially by wet-laying techniques or by hydrolacing with staple fiber. Even though the carbon which constitutes part of the polymeric fibrid structure is completely encapsulated by the polymer, the microporous surface area of the fibrids is substantially greater than that of the non-loaded fibrid. This surprising result is believed due to micro-voids in the fibrids. These tiny voids allow fluids to pass through the polymer and impurities in the fluids to become adsorbed on the carbon particles.
  • the fibrids of this invention are not electrically conductive.
  • the fibrids of this invention exhibit high CCI4 adsorption activity.
  • the level of adsorption activity parallels the level of microporous surface area.
  • the loaded fibrids of this invention are especially useful for removing volatile organic compounds (NOC's) from air and dissolved impurities from water.
  • Certain of the nonwoven sheet structures containing the fibrids are useful for combined particle filtration and impurity adsorption.
  • the extent of loaded fibrid activity is dependent upon the surface area and activity of the carbon powder before loading and the amount of carbon powder in the fibrid.
  • Preferred carbon powders pass a 60-mesh screen while most preferred powders pass a 325-mesh screen and have a microporous surface area >500 m 2 /g preferably > 1000 m 2 /g.
  • Carbon-loaded fibrids of this invention possess surprisingly high (>200 m 2 /g) surface area, and absorb and retain greater than 4% by weight carbon tetrachloride vapor by the adsorption test described below.
  • the surface area of >200 m 2 /g is substantially higher than that of 100% polymer fibrids known in the art.
  • the adsorption activity is superior to commercial air filters in which an equivalent amount of active carbon is bound adhesively to a fiber matrix.
  • fibrids from a variety of synthetic organic polymers is well known. Many patents describe such manufacture and indeed also disclose incorporation of fillers (see Morgan U.S. Patent No.2,999,788).
  • various polymers suitable for fibrids of the invention are polyacrylonitrile and copolymers thereof, polystyrene, cellulose esters, e.g., cellulose acetate, aramids such as poly (m-phenylene isophthalamide) (MPD-I) and poly(p-phenylene terephthalamide) (PPD-T) etc., to name a few.
  • the present invention incorporates activated carbon in the polymeric fibrid during its manufacture.
  • activated carbon in the desired amount is mixed in with a solution of the polymer to be converted to fibrid form.
  • the mixture is then introduced with vigorous agitation into a liquid preferably water or other aqueous solution which is miscible with the polymer solvent but in which the polymer is insoluble.
  • the fibrids which form are then collected for subsequent use.
  • the fibrids containing the activated carbon may be used in the same general manner as activated carbon granules, as in a column. In such form, the activated carbon is protected against break-up in use and yet surprisingly is found to have high activity by virtue of the fact that its porosity is substantially retained even though it is a component of the fibrid.
  • One skilled in the art would have expected that the pores of the activated carbon would be covered by polymer.
  • This invention also provides non-shedding, fibrous sheet structures containing carbon-loaded fibrids which are suitable for separating gaseous impurities from air and dissolved impurities from water and other liquids.
  • Contemplated are wet-laid composite sheet structures comprising papers of the loaded fibrids with or without short staple fiber and wet-laid mats of such fibrids and fiber fluff with or without short staple fiber.
  • Such fibrous sheet structures can be made by conventional forming methods. High levels of carbon can be incorporated into structures with a wide range of densities and air permeability without the need for adhesives.
  • the level of activity of the fibrous structures is dependent upon their fibrid content and the activity of the loaded fibrids. It is desirable that sufficient fibrids be used such that the percentage of activated carbon in the sheet structures be at least 20%.
  • Sheet structures of this invention adsorb at least 4% by weight CCI4 and have a surface area of at least 50 m 2 /g.
  • Wet-laid papers can be made entirely from the aforementioned loaded fibrids, or from a mixture of the loaded fibrids and short fiber (floe) by conventional paper making processes.
  • the floe if used, is preferably of 1/4 in. to 3/4in. cut length.
  • the polymer composition of the floe is not critical and acceptable floe compositions include aramids, nylons, polyesters, polyacrylonitrile, etc.
  • Papers from 100% of the loaded fibrids of this invention have high adsorption activity (>4% CC14) and high surface area (> 200 m 2 /g). Those having low tensile strength are particularly useful in the preparation of hydrolaced fabrics because they disintegrate readily in the hydrolacing process while those with higher strengths are more suited for air and for water purification.
  • Air permeable papers are made by wet-laying a mixture of floe with the loaded fibrids. Suitable mixtures contain 10% to 50% floe and even more. Permeability can be adjusted by varying the percentage of floe in the paper and by changing the basis weight of the paper. Thus, one can prepare papers with air permeabilities ranging from 0.3 to 30 m ⁇ /min/m 2 by judicious selection of these variables. Papers with low air permeability (i.e., ⁇ 3 m ⁇ /min/m 2 ) are mostly suited for filtering of small particles (e.g., ⁇ 1 micron), as well as, adsorption of volatile organic compounds (NOC's). They are also useful for filtering liquid media to improve color, odor, and taste.
  • air permeability i.e., ⁇ 3 m ⁇ /min/m 2
  • Papers with high air permeability are useful where low pressure drops and high fluid flows per unit area are desired. Generally, these papers are less efficient filters than those of lower permeability and are most useful for filtering relatively large particles.
  • Low density wet-laid mats useful for air filtration, odor adsorption, and liquid filtration can be made from fibrids and fiber fluff of aramid fibers using conventional paper-making processes. Suitable fiber fluff of aramid fibers and mixtures with thermoplastic fibers are described in U.S. 4,957,794.
  • Useful polymeric fluffs include poly(m-phenylene isophthalamide), poly(p-phenylene terephthalamide), and mixtures thereof.
  • the activity level of the mat depends on the amount of loaded fibrids used and their activity.
  • the permeability and tensile strength of the mat are dependent upon the mat basis weight, bulk density, and percentage of fibrids used. By varying these parameters, one skilled in the art can prepare cohesive mats with air permeability ranging from 1.5 to 30 m ⁇ /min/m 2 . Even lower permeability can be achieved by densifying the mats as by passing them between high pressure rolls.
  • fiber floe can be added to the mixture of fiber fluff and loaded fibrids in order to increase the tensile strength of the mat.
  • Aramid floe is especially useful when mats for high temperature filtration are desired.
  • Thermoplastic floe is especially useful for preparing active mats which can be thermally shaped and set to various geometric shapes.
  • Useful amounts of fiber floe range from 2% to 50% (preferably 10% to 30%) of the total composite weight.
  • the aforementioned mat structures are useful as filter media for both particle filtration and organic vapor adsorption. They are especially useful as air-duct filters, cooking-range filters, air-conditioner filters, and shoe insoles for absorption of vapors, odors, etc.
  • Very high-strength, adsorbent fabrics have been made by coentangling the carbon-loaded fibrids with carded webs by use of high pressure water streams.
  • the resulting nonwoven structures have good drape and can be sewn into various convenient forms, such as bags, for air and water purification. They can be prepared by tying the fibrids into carded staple fiber webs.
  • a paper sheet of loaded fibrids may be layered between two carded webs, and high pressure water jets applied (hydrolacing).
  • the fibrid paper is broken apart by the water jets to generate loose fibrids which become inter-entangled with the interlocking fibers of the carded webs.
  • papers containing both fibrids and floe can be used, papers composed of 100% fibrids are preferred because of their higher activity and the relative ease with which they can be broken into individual or small clumps of fibrids by the water jets.
  • papers comprised of mixtures of carbon-loaded and non-loaded fibrids can be used. Hydrolacing is performed by techniques shown in U.S.
  • Suitable carded webs can be made from polymeric fibers of polyester, nylon, rayon, aramids, polyacrylonitrile, etc. using conventional textile carding processes.
  • Suitable fiber deniers range from 0.5 dpf to 8 dpf, preferably 1 dpf to 3 dpf.
  • Preferred staple cut length ranges between 1/4-in. to 3 in., most preferred is staple of 3/4-in. to 2 in. cut length. If desired, webs containing staple fiber of mixed polymer composition and denier are suitable. Products having a basis weight of from 1-10 oz/yd 2 are useful.
  • a weighed sample of dried fibrids or article is placed in a vacuum oven at 160°C for 2 hours and then allowed to set open to the atmosphere at room temperature for 1 hour.
  • the sample is weighed and then exposed to an air atmosphere saturated with carbon tetrachloride vapor at room temperature for 2 hours.
  • the exposed fibrids are then allowed to set open to the atmosphere for 2 hours at room temperature and then re-weighed.
  • the retained pick-up of CCI4 is determined by subtracting the weight of the fibrids before exposure to CCI4 from their weight after exposure and after setting for 2 hrs.
  • the CCI4 adsorbed is then expressed as a percentage of the unexposed weight.
  • Surface area is measured as follows:
  • Air Permeability is measured as follows: Air permeability of a fibrous article is determined under ambient conditions using a Fabric Permeability Machine sold by Frazier Precision Instrument Co., Gaithersburg, Maryland, USA. In conducting the .test, air flow measurements are taken using a pressure differential of about 0.5 inches of water at several different regions of a sample, and the measurements are averaged. The following examples are illustrative of this invention and are not intended as limiting. EXAMPLE 1
  • This example demonstrates the preparation of carbon-aramid fibrids having very high surface area and CC14 adsorption activity.
  • Dimethylacetamide (100 gms) was mixed with 100 gms of a solution comprised of 14 gms MPD-I, 76 gms dimethylacetamide, and 10 gms calcium chloride.
  • activated carbon Type PCB-G obtained from Calgon Carbon Corp. of Pittsburg, PA
  • the mixture was then poured slowly into vigorously stirred water (about one pint) in a Waring blender.
  • the resulting solid fibrids were collected on a Buchner funnel and washed thoroughly by successive amounts of water. A small portion of the black, homogeneous residue was dried in a vacuum oven at about 120 °C. The surface area (B.E.T. method) of the dried fibrids was 598 square meters per gram. A portion of the activated carbon was found to have a surface area of 994 square meters per gram. Thus, the activated carbon encapsulated in the aramid polymer was accessible and retained about 90% of its surface area.
  • Fibrids of encapsulated activated carbon were prepared similarly to the above except that the ratio of activated carbon to MPD-I was (1) 4:1, (2) 5:1, (3) 6:1, (4) 1:1, and (5) 3:1.
  • Surface area of the fibrids were as follows: Item Surface Area
  • This example demonstrates the preparation of carbon-aramid fibrids and shows their high surface area and high CCI4 adsorption activity compared to fibrids not containing encapsulated carbon.
  • a mixture containing dimethylacetamide (72%), MPD-I (6 %), calcium chloride (4 %) and activated carbon (18 %) was continuously precipitated by mixing with water in a high-shear fibridator such as described in U.S. 3,018,091.
  • the resulting fibrids were washed free of dimethylacetamide with water and the black homogeneous product collected on a drum filter. A portion of the black fibrids was dried in a vacuum oven at about 120°C.
  • a portion (3.00 gms) of the dried fibrids was mixed with 100 ml of dimethylacetamide containing 3% calcium chloride to dissolve away the MPD-I portion of the fibrids.
  • the remaining material, suspended activated carbon, was collected on a filter funnel and washed free of residual MPD-I with several portions of dimethylacetamide.
  • the carbon residue was dried in a vacuum oven at about 120°C.
  • the dried activated carbon weighed about 2.10 gms., or 70% of the original fibrids.
  • the surface area of another portion of the dried fibrids was found to be 603 square meters per gram compared to 1104 square meters per gram or a sample of pure activated carbon. Thus, about 78% of the pure carbon surface area is retained and accessible to the encapsulated carbon. Fibrids prepared similarly to the above, except that they contained no activated carbon had a surface area of only 32.1 square meters per gram.
  • This example demonstrates the suitability of polymers other than MPD-I. Specifically, cellulose acetate (CA), polystyrene (PS), and poly-acrylonitrile (ANP).
  • CA cellulose acetate
  • PS polystyrene
  • APN poly-acrylonitrile
  • the adso ⁇ tion activity of the fibrids with encapsulated activated carbon is vastly higher than the fibrids comprised of 100% polymer and, in spite of being encapsulated in a polymer matrix, the activated carbon retains about 85%-95% of its activity in the pure state.
  • This example demonstrates the preparation of adsorbent papers from activated-carbon fibrids.
  • Fibrids prepared as in Example 2 were mixed with water in a Jones Sharkle pulper at a consistency of 0.71% solids. This mixture was pumped to the headbox of a Fourdrinier paper machine equipped with a dryer section having 12 Sandy Hill dryer cans. The mixture was diluted at the headbox to 0.044% solids and then formed continuously into a paper by conventional methods at a speed of 7.5 meters per minute.
  • the dry paper (A) had a basis weight of 152.6 g/m 2 , and a CCI4 adso ⁇ tion activity of 15%. Surface area was 506 square meters/gram.
  • Another paper (B) was made similarly to the above paper except that final dilution was 0.05% solids, and the solids were composed of 80% fibrids and
  • This example illustrates the preparation of an adsorbent, hydrolaced non- woven fabric from activated carbon fibrids.
  • a paper of about 237.3 g/m 2 prepared similarly to that of Example 4A was placed between a carded web of polyethylene terephthalate fibers (38.1 mm cut length, 1.5 denier) 40.7 g/m 2 and one of 20.3 g/m 2 .
  • the layered structure was then hydrolaced to yield a drapeable, sewable fabric of 257.6 g/m 2 .
  • Fabric thickness is 1.8 mm.
  • Air permeability is 7.6 m ⁇ /min/m 2 and CCI4 adso ⁇ tion activity is 10.3%. Similar results can be expected where the polyester fibers are replaced with poly(m-phenylene) isophthalamide fibers.
  • This example demonstrates a second type of activated carbon, "Darco", useful for preparing active fibrids.
  • Dimethylacetamide (371 grams) was mixed with 200 grams of a solution comprised of 28 grams of MPD-I, 152 grams dimethylacetamide, and 20 grams calcium chloride. Eighty grams of activated carbon powder ("Darco", obtained from Aldrich Chemical Co.) was added with stirring until a uniform mixture was obtained. The mixture was then poured slowly into vigorously stirred water
  • This example demonstrates the preparation of papers from activated- carbon fibrids.
  • Fibrids prepared as in Example 2 were mixed with water and pumped to the headbox of a Rotoformer machine equipped with an extended wire table.
  • the stream of fibrids was combined with a second stream composed of a mixture of water and 6 mm cut length fibers of vinyl chloride/vinyl acetate copolymer (sold by Wacker Chemicals of New Canaan Ct. as paper grade Wacker MP Fibre), and a third stream composed of a mixture of water and fluff of poly(meta-phenylene isophthalamide) (as described in US Pat. No.4,957,794).
  • the flow rates and solids content of each stream were adjusted such that the combined mixture was composed of 67% fibrids, 20% fluff, and 13% fiber.
  • the combined streams were formed into a continuous wet-laid mat of conventional methods at 25 feet per minute (7.7 meters per minute).
  • the wet mat was dried on a flow-through dryer at 345°F (173.9°C).
  • the mat had a CCI4 adso ⁇ tion activity of 17.5%, and an air permeability of 20.5 m ⁇ /min/m 2 .
  • the mat had a basis weight of 213.6 grams/sq meter, and a thickness of 2.37 mm.
  • This example demonstrates the direct relationship between surface area and CCI4 adso ⁇ tion for sheet structures.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Des fibrides polymères, contenant du charbon actif incorporé, peuvent être utilisés comme adsorbants.
PCT/US1992/007425 1991-07-01 1992-08-31 Fibrides contenant du charbon actif WO1994005841A1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
IL10233892A IL102338A (en) 1991-07-01 1992-06-26 Polymeric fibers containing activated carbon
ZA924892A ZA924892B (en) 1991-07-01 1992-07-01 Activated carbon-containing fibrids
JP6507137A JP2747373B2 (ja) 1991-07-01 1992-08-31 活性炭含有フィブリド
DE69225909T DE69225909T2 (de) 1991-07-01 1992-08-31 Fibriden beinhaltend Aktivkohle
MX9203867A MX9203867A (es) 1991-07-01 1992-08-31 Fibridos que contienen carbon activado y metodo para su fabricacion.
CA002142824A CA2142824C (fr) 1991-07-01 1992-08-31 Fibrids renfermant du charbon active
EP92919821A EP0656964B1 (fr) 1991-07-01 1992-08-31 Fibrides contenant du charbon actif
PCT/US1992/007425 WO1994005841A1 (fr) 1991-07-01 1992-08-31 Fibrides contenant du charbon actif
KR1019950700725A KR100219098B1 (ko) 1991-07-01 1992-08-31 활성탄 함유 피브리드
AU25783/92A AU670412B2 (en) 1991-07-01 1992-08-31 Activated carbon-containing fibrids
US08/401,326 US5482773A (en) 1991-07-01 1995-03-09 Activated carbon-containing fibrids

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US72421191A 1991-07-01 1991-07-01
CA002142824A CA2142824C (fr) 1991-07-01 1992-08-31 Fibrids renfermant du charbon active
PCT/US1992/007425 WO1994005841A1 (fr) 1991-07-01 1992-08-31 Fibrides contenant du charbon actif

Publications (1)

Publication Number Publication Date
WO1994005841A1 true WO1994005841A1 (fr) 1994-03-17

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PCT/US1992/007425 WO1994005841A1 (fr) 1991-07-01 1992-08-31 Fibrides contenant du charbon actif

Country Status (4)

Country Link
IL (1) IL102338A (fr)
MX (1) MX9203867A (fr)
WO (1) WO1994005841A1 (fr)
ZA (1) ZA924892B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023768A1 (fr) * 1994-03-03 1995-09-08 E.I. Du Pont De Nemours And Company Bille poreuse contenant un biocatalyseur adsorbant
DE4446253A1 (de) * 1994-12-23 1996-06-27 Hasso Von Bluecher Filtermatten mit adsorbierenden Eigenschaften
WO1999004072A1 (fr) * 1997-07-17 1999-01-28 E.I. Du Pont De Nemours And Company Feuilles d'aramide moulee
US6045700A (en) * 1996-07-29 2000-04-04 Solutia Inc. Retrievable organic carbon scavengers for cleaning of contaminated surface water sediments
WO2007121940A2 (fr) * 2006-04-24 2007-11-01 Evonik Stockhausen Gmbh Produits superabsorbants colorés
WO2013068622A1 (fr) * 2011-11-10 2013-05-16 Claved Investment, Ltd Bouchon pour bouteilles de vin

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EP0031719A2 (fr) * 1979-12-28 1981-07-08 Albany International Corp. Fibres textiles et feuilles contenant une matière adsorbante et procédés pour leur fabrication
US4840838A (en) * 1988-09-08 1989-06-20 E. I. Du Pont De Nemours And Company High temperature filter felt
EP0386975A2 (fr) * 1989-03-06 1990-09-12 Courtaulds Plc Filaments et filtre pour des gaz chauds
EP0446870A1 (fr) * 1990-03-12 1991-09-18 E.I. Du Pont De Nemours And Company Papiers à haute résistance faits à partir de flocs et de fibres

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US2845962A (en) * 1953-07-14 1958-08-05 Dunlop Rubber Co Antistatic fabrics
EP0031719A2 (fr) * 1979-12-28 1981-07-08 Albany International Corp. Fibres textiles et feuilles contenant une matière adsorbante et procédés pour leur fabrication
US4840838A (en) * 1988-09-08 1989-06-20 E. I. Du Pont De Nemours And Company High temperature filter felt
EP0386975A2 (fr) * 1989-03-06 1990-09-12 Courtaulds Plc Filaments et filtre pour des gaz chauds
EP0446870A1 (fr) * 1990-03-12 1991-09-18 E.I. Du Pont De Nemours And Company Papiers à haute résistance faits à partir de flocs et de fibres

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995023768A1 (fr) * 1994-03-03 1995-09-08 E.I. Du Pont De Nemours And Company Bille poreuse contenant un biocatalyseur adsorbant
DE4446253A1 (de) * 1994-12-23 1996-06-27 Hasso Von Bluecher Filtermatten mit adsorbierenden Eigenschaften
US6045700A (en) * 1996-07-29 2000-04-04 Solutia Inc. Retrievable organic carbon scavengers for cleaning of contaminated surface water sediments
WO1999004072A1 (fr) * 1997-07-17 1999-01-28 E.I. Du Pont De Nemours And Company Feuilles d'aramide moulee
WO2007121940A2 (fr) * 2006-04-24 2007-11-01 Evonik Stockhausen Gmbh Produits superabsorbants colorés
WO2007121940A3 (fr) * 2006-04-24 2007-12-21 Stockhausen Chem Fab Gmbh Produits superabsorbants colorés
WO2013068622A1 (fr) * 2011-11-10 2013-05-16 Claved Investment, Ltd Bouchon pour bouteilles de vin
ES2412529A1 (es) * 2011-11-10 2013-07-11 Claved Investments, Ltd. Tapón para botellas de vino

Also Published As

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MX9203867A (es) 1993-01-29
IL102338A (en) 1996-11-14
ZA924892B (en) 1994-01-03

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