WO2000035562A2 - Separation de l'eau et de melanges chimiques - Google Patents

Separation de l'eau et de melanges chimiques Download PDF

Info

Publication number
WO2000035562A2
WO2000035562A2 PCT/US1999/030064 US9930064W WO0035562A2 WO 2000035562 A2 WO2000035562 A2 WO 2000035562A2 US 9930064 W US9930064 W US 9930064W WO 0035562 A2 WO0035562 A2 WO 0035562A2
Authority
WO
WIPO (PCT)
Prior art keywords
drying agent
binder
effective amount
weight percent
composition
Prior art date
Application number
PCT/US1999/030064
Other languages
English (en)
Other versions
WO2000035562A3 (fr
Inventor
Raymond Hilton Percival Thomas
Roy Philip Robinson
David John Williams
Peter Brian Logsdon
Original Assignee
Alliedsignal Inc.
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
Application filed by Alliedsignal Inc. filed Critical Alliedsignal Inc.
Priority to AU21918/00A priority Critical patent/AU2191800A/en
Priority to EP99966357A priority patent/EP1144090A3/fr
Publication of WO2000035562A2 publication Critical patent/WO2000035562A2/fr
Publication of WO2000035562A3 publication Critical patent/WO2000035562A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/28—Selection of materials for use as drying agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption

Definitions

  • the present invention relates to novel desiccant compositions comprised of certain drying agents and binders and a method for separating, drying and/or filtering chemical mixtures.
  • the composition and method of the invention have broad applicability. They may be used for example to remove water from chemical mixtures like refrigerants (e.g., in vehicular air conditioning systems), air (e.g, in vehicular braking systems), natural gas and cleaning solvents (e.g., in semiconductor manufacture and pipeline cleaning).
  • a number of methods have been developed in order to separate water from chemical mixtures.
  • the known methods include the use of alkaline earth compounds, carbon molecular sieves, oleum, distillation, and membranes.
  • Many of the known methods are disadvantageous because the processes are inefficient or uneconomical; the drying agents undergo undesirable side reactions and/or adsorbs or absorbs the material being dried (See, U.S.P. 5,347,822).
  • Drying agents used principally in connection with circulating refrigerants include activated aluminum oxide, silica gels and molecular sieves in solid or granulated form. During use, these materials are abraded by the flow of the cooling liquid and mechanical vibrations and form dust particles. In order to prevent the dust from clogging the valves and conduits of the refrigeration system, a filter must be employed. This costs time (for installation) and money.
  • the compositions and method of the invention overcome the difficulties associated with the prior art. In particular, we have found that certain of the compositions eliminate the need for a separate filter element.
  • a composition comprising a drying agent and a binder wherein: (a) said drying agent comprises an effective amount of a molecular sieve and said binder comprises an effective amount of a support comprising cellulose; (b) said drying agent comprises an effective amount of a molecular sieve and said binder comprises at least 25 weight percent of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam; or (c) said drying agent comprises an effective amount of a superabsorbent polymer and molecular sieve and said binder comprises an effective amount of a material selected from the group consisting of polyurethane foam, polyisocyanurate foam and a support comprising cellulose.
  • a process comprising contacting a chemical mixture comprising water with an effective amount of a composition comprising a drying agent and a binder wherein: (a) said drying agent comprises an effective amount of a molecular sieve and said binder comprises an effective amount of a support comprising cellulose; (b) said drying agent comprises an effective amount of a molecular sieve and said binder comprises at least 25 weight percent of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam; or (c) said drying agent comprises an effective amount of a superabsorbent polymer and molecular sieve and said binder comprises an effective amount of a material selected from the group consisting of polyurethane foam, polyisocyanurate foam and a support comprising cellulose
  • the invention relates to a desiccant composition comprising a drying agent and a binder.
  • the invention relates to the following compositions: A composition comprising a drying agent and a binder wherein: (a) said drying agent comprises an effective amount of a molecular sieve and said binder comprises an effective amount of a support comprising cellulose; (b) said drying agent comprises an effective amount of a molecular sieve and said binder comprises at least 25 weight percent of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam; or (c) said drying agent comprises an effective amount of a superabsorbent polymer and molecular sieve and said binder comprises an effective amount of a material selected from the group consisting of polyurethane foam, polyisocyanurate foam and a support comprising cellulose.
  • the drying agent comprises an effective amount of a molecular sieve and said binder comprises from 30 to 75 weight percent of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam.
  • the drying agent comprises 50 weight percent of a molecular sieve and said binder comprises from 50 weight percent of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam.
  • Polymer means a homopolymer, copolymer (not limited to only two components), or mixtures thereof having a molecular weight of from 1,000,000 to 100,000,000 and preferably from 10,000,000 to 100,000,000 and more preferably from 85,000,000 to 100,000,00 and which are crosslinked sufficiently to impart moisture absorbing or adsorbing properties;
  • Superabsorbent Polymer means a Synthetic or Semi-Synthetic (defined below) Polymer that swells, to at least twice its dry volume, with the addition of water at room temperature after standing for up to two hours; Semi-Synthetic means a derivative of a naturally occurring Polymer; and "Synthetic” means a Polymer produced through chemical reaction.
  • Exemplary Semi-Synthetic Polymers include, without limitation, cellulose ethers, modified starches, starch derivatives, natural gum derivatives, and mixtures thereof.
  • Illustrative Synthetic Polymers include, without limitation, polymers, related polymers, and polymer salts of acrylamide, acrylic acid, ethylene oxide, methacrylic acid, polyethyleneimine, polyvinyl alcohol, polyvinyl pyrrolidone, and mixtures thereof.
  • “related polymer” means that the polymer repeat unit, or a branch thereof, is extended by carbon atoms, preferably from one to four carbon atoms.
  • a related polymer of acrylic acid is one in which the vinyl group is extended by one carbon to form an allyl group.
  • Synthetic Polymers are preferred. Polyacrylic acid and its salts are more preferred and sodium polyacrylate (such as SXM70 and SXM77 from Stockhausen of Greensboro, North Carolina) and potassium polyacrylate are most preferred.
  • sodium polyacrylate such as SXM70 and SXM77 from Stockhausen of Greensboro, North Carolina
  • potassium polyacrylate are most preferred.
  • Any molecular sieve may be used in the composition of the invention. These materials are commercially available from for example UOP of Des Plaines, Illinois and Grace Corporation of Baltimore, Maryland. They may also be prepared by methods well known in the art. Suitable molecular sieves include without limitation: Type A, Type B, Type L, Type X, Type Y and mixtures thereof. In the practice of this invention Type A is preferred. For refrigeration applications molecular sieves of 3 - 4 Angstroms are preferred such as XH6, XH7, XH9 and XH11 from UOP.
  • drying agents may be used in the compositions and method of the invention. Besides Superabsorbent Polymers and molecular sieves, other known drying agents can optionally be employed in the compositions of the invention. They include without limitation activated alumina, activated carbon, silica gel and mixtures thereof. When multiple drying agents are used they may be used in any ratio that is from 1 to 99 to 99 to 1.
  • drying agent(s) including type and form will depend on the process (including materials and equipment) that produces the chemical mixture or in which the chemical mixture is being used.
  • the shape and hardness of the drying agent should be chosen to withstand the rigors of the system in which it is used and to avoid entrainment in the equipment, plugging openings and conduits.
  • the drying agent may be a powder, fine particles, fibers, or a shaped piece or pieces.
  • a 50/50 mixture of superabsorbent polymer and molecular sieve (with 50 weight percent binder) provides superior capacity and drying ability than either drying agent alone in a process for separating water from halogenated hydrocarbons, for example a refrigerant such as R-134a.
  • Suitable binder materials include, without limitation, organic plastic binders such as isocyanate-based polymers, phenolic resins, aliphatic epoxy resins, silicone, polyvinyl alcohol resins, polyphenylene sulfide, poly(ether ketone), polyether sulfone, supports comprising cellulose and mixtures thereof.
  • organic plastic binders such as isocyanate-based polymers, phenolic resins, aliphatic epoxy resins, silicone, polyvinyl alcohol resins, polyphenylene sulfide, poly(ether ketone), polyether sulfone, supports comprising cellulose and mixtures thereof.
  • Polyurethane foam, polyisocyanurate foam and supports comprising cellulose are preferred. These materials are known in the art and can be purchased commercially or prepared by known methods.
  • the processing temperature should be less than 300°C, preferably less than 250°C.
  • the desiccant compositions of the invention can be prepared by adding the drying agent as one of the components in the process (e.g, polymerization) used to prepare the binder.
  • the desiccant composition can be prepared by adding the drying agent with the other foam ingredients from the same or a different mix head and foaming the mixture. If a preblend of the foam ingredients is used, the drying agent can be added to the "A" and/or "B side" of the preblend. Preferably it is added to the "B side".
  • the desiccant composition has a laminate structure (i.e, layered e.g., binder/drying agent/binder etc.)
  • Desiccant compositions which utilize a support comprising cellulose may be prepared by following the procedure outlined in European Patent Application 0 359 615.
  • the amount of drying agent and binder utilized in the desiccant composition is application dependent. Each should be used in "effective amounts" where this term means that amount of drying agent and optionally binder necessary to achieve a desired degree of dryness, separation and/or filtering and that amount of binder necessary to support the drying agent.
  • the desiccant compositions have the compositions disclosed in Table I below. The numerical ranges are understood to be prefaced by "about.”
  • the requisite initial dryness of the drying agent will depend on such factors as the amount of water in the chemical mixture to be dried, the amount of drying agent used, and the equilibrium concentration of water in the drying agent when it is in contact with the chemical mixture at its final, or desired, water content.
  • the drying agent is dried to the greatest extent possible prior to.
  • the temperature at which the drying agent is dried should be high enough to remove water without degrading the drying agent. In the case of molecular sieves this drying is conducted generally in a vacuum desiccator at temperatures up to 300°C. In the case of Superabsorbent Polymers the drying is conducted again in a vacuum desiccator but at temperatures between 100 and 200°C. As the drying agent loses water, its weight decreases until it reaches a constant weight.
  • essentially anhydrous means that the drying agent contains less than 1 weight percent water.
  • the amount of desiccant composition utilized will depend again on the application.
  • An effective amount of the desiccant composition should be used where this term means an amount necessary to achieve a desired degree of dryness, separation and/or filtering. This amount is readily determined by consideration of the amount of water sought to be separated, the flow rate of the chemical mixture, and the adsorptive or absorptive characteristics of the drying agent and binder.
  • the desiccant composition is used in an amount of from 3 to 700 percent, preferably from 100 to 700 percent and most preferably from 200 to 700 percent based upon the amount of water to be removed.
  • the invention in another embodiment, relates to a process comprising: contacting a chemical mixture comprising water with a drying effective amount of a desiccant composition comprising a drying agent and a binder wherein: (a) said drying agent comprises an effective amount of a molecular sieve and said binder comprises an effective amount of a support comprising cellulose; (b) said drying agent comprises an effective amount of a molecular sieve and said binder comprises at least 25 weight percent of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam; or (c) said drying agent comprises an effective amount of a superabsorbent polymer and molecular sieve and said binder comprises an effective amount of a material selected from the group consisting of polyurethane foam, polyisocyanurate foam and a support comprising cellulose.
  • a chemical mixture is a liquid, gaseous or partially gaseous mixture of water and at least one inorganic material, organic material, or mixtures thereof.
  • inorganic materials include, without limitation, air, hydrogen, hydrogen chloride, sulfur dioxide, sulfur trioxide, carbon monoxide, carbon dioxide, boron trifluoride, uranium hexafluoride, sulfur hexafluoride, arsenic pentafluoride, halide salts, nitric acid, sulfuric acid, chlorine, metal ions, non-aqueous inorganic solvents, and mixtures thereof.
  • Exemplary organic materials include, without limitation, alcohols such as methanol, ethanol and propanol, ketones including acetone, and aromatics including benzene, toluene and naphthalene, hydrocarbons, including gaseous hydrocarbons such as methane, ethane, propane and butane; and halogenated hydrocarbons such as chlorofluorocarbons, hydrochlorofluorocarbons, hydrofluorocarbons, and perfluorocarbons, chlorocarbons, hydrochlorocarbons, hydrofluoroethers, fluoroethers, and mixtures thereof, including without limitation difluoromethane, trifluoroethane, tetrafluoroethane, pentafluoroethane, pentafluoropropane and the like.
  • alcohols such as methanol, ethanol and propanol
  • ketones including acetone
  • aromatics including benzene, toluene and naphthalene
  • the process of the invention may be carried out in any suitable vessel.
  • the chemical mixture is contacted with the desiccant composition for from 1 to 24 hours, preferably from 1 to 6 hours and most preferably from 1 to 4 hours.
  • the desiccant composition is utilized in a refrigeration system such as a car air conditioning system to absorb water from the refrigerant.
  • the process comprises cycling a refrigerant in a system wherein the refrigerant is condensed and thereafter evaporated, said system comprising an effective amount of a composition comprising an drying agent and a binder wherein said drying agent comprises an effective amount of a material selected from the group consisting of superabsorbent polymer, molecular sieve and mixtures thereof and said binder comprises an effective amount of a material selected from the group consisting of polyurethane foam and polyisocyanurate foam and a support comprising cellulose.
  • the desiccant composition may comprise the core of a drier.
  • a drier core which utilizes a drying agent of the invention with a polyurethane foam or polyisocyanurate foam binder may be prepared by adding the drying agent to a foam formulation in the manner discussed above and foaming the composition in a container, the resulting desiccant composition would comprise the core and the container the drier.
  • a drier core which utilizes a drying agent of the invention and a support comprising cellulose as the binder can be prepared by adding the drying agent to the cellulose binder as discussed above and rolling or stacking the resulting composition in a container.
  • the desiccant composition would once again comprise the core and the container the drier.
  • This drier core would be fixed in the refrigeration system in the circulation path by means known in the art.
  • a desiccant compositions comprising a mixture of a Superabsorbent Polymer and molecular sieve and a polyurethane or polyisocyanurate foam binder are particularly useful in this process embodiment especially at loadings of 50 weight percent drying agent (50:50 ratio of drying agents) and 50 weight percent foam.
  • This composition exhibits several advantages over prior art materials including greater capacity and drying ability, smaller volume and elimination of a separate filter element.
  • the invention can be used to absorb water from spent cleaning solvent such as that used in semiconductor manufacture or natural gas or other pipeline cleaning.
  • the process would comprise exposing a solvent comprising water to a desiccant composition of the invention. This could be done after the solvent was recovered as a separate step or during the cleaning process itself.
  • the desiccant composition would be fixed, for example, to the inside of a pipeline and the solvent in the course of passing through the pipeline would pass through the desiccant and water would be removed from the solvent.
  • the invention can be used to absorb water from air such as for example in air brake applications.
  • the performance of the drying agent may be improved by periodically regenerating the drying agent to release the water separated from the chemical mixture.
  • Regeneration may be accomplished by any convenient means, such as by heating the drying agent to a temperature suitable to release water from the drying agent.
  • the amount of water removed by the Superabsorbent Polymer must be monitored in order to maintain its mechanical integrity. If the Superabsorbent Polymer is in solid form, allowing the amount of water separated from the chemical mixture by the Superabsorbent Polymer to reach a level at which it turns from a solid into a gel or liquid may be disadvantageous. The amount of water at which this phase change occurs will vary depending on the Superabsorbent Polymer used but is readily determined by routine experimentation.
  • the Superabsorbent Polymer is used to a point just below the point at which a phase change occurs.
  • Water separation may be monitored by any convenient means as for example, measuring the amount of water in the chemical mixtures. Further, if one or more other chemicals in the chemical mixture forms a gel or solid with the Superabsorbent Polymer, the water required for the solid to liquid phase change may be altered.
  • That mixture may be treated sequentially with more than one drying agent bed to reach the desired level.
  • more than one drying agent bed we have discovered the use of a sodium polyacrylate polymer bed followed by a molecular sieve bed is particularly effective.
  • the process of the invention may be used in conjunction with other well known drying methods.
  • This example demonstrates the preparation of a desiccant composition comprising polyurethane foam and a superabsorbent polymer.
  • the isocyanate or A component of the mixture used was Mondur 2OS available from Bayer Corporation.
  • the formulation of the B component of the mixture was as follows: 50 parts VORANOL-490 (polyol available from Dow Chemical Co.) 50 parts VORANOL-391 (polyol available from Dow Chemical Co.) 2.5 parts L-6164 (surfactant available from Goldschmidt Chemical Co.) 3.2 parts POLYCAT 41 (catalyst available from Air Products and Chemicals) 53 parts HCFC-141b (blowing agent available from AlliedSignal Inc.).
  • the A and B side were mixed together and sodium polyacrylate (constituting 43 weight percent of the entire mixture) was added to the mixture and quickly stirred.
  • the whole mass was then poured into a 150 cc Teflon vessel.
  • the vessel was capped and the foam allowed to rise.
  • the vessel was equipped with ports on both ends so that gaseous refrigerant could be passed through it.
  • Example 1 A sample of R-134a containing 578 ppm water was passed through the vessel described in Example 1 above which contained 27 grams of the potassium salt of polyacrylic acid and foam (The potassium salt of polyacrylic acid comprised 43% of the composition). The moisture content on exiting the vessel was measured using a Karl Fischer coulometer and found to be 25 ppm.
  • Example 2 The experiment of Example 2 is repeated except that R-134a containing 1114 ppm water was passed through a different vessel containing 51.3 grams of the desiccant composition (containing 43% of the potassium salt of polyacrylic acid). The moisture content on exiting the vessel was 23 ppm.
  • a desiccant composition was prepared as in Example 1 except that the sodium polyacrylate constituted 70 weight percent of a 30 gram sample. Wet nitrogen was passed through the vessel until the desiccant composition had absorbed 20% of its dry weight in water. R-134a was then passed through the vessel very slowly. The exiting
  • R-134a had a moisture content of 180 ppm.
  • This example demonstrates the superior capacity of the desiccant composition in that even after having absorbed 20% of its dry weight in water, the moisture concentration is far below that reported in the 1994 ASHRAE Handbook for molecular sieve (800 ppm at 16% of its dry weight in water). (I do not understand this)
  • a desiccant composition is prepared as in Example 1 except that the polyol used is polybutylene oxide and the sodium polyacrylate constitutes 60 weight percent of a 30 gram sample.
  • Wet nitrogen is passed through the vessel until the desiccant composition absorbs 20% of its dry weight in water.
  • R-134a is passed through the vessel very slowly. The exiting R-134a has a moisture content of 180 ppm.
  • a desiccant composition is prepared as in Example 1 except that the polyol used is polypropylene oxide and the sodium polyacrylate is 60 weight percent of a 30 gram sample.
  • R-134a is passed through the vessel very slowly. The exiting R-134a has a moisture content of 180 ppm.
  • Sodium polyacrylate deposited on cellulosic material was obtained from Gelok International. The material's tradename is 9525 s/s.
  • a strip that measured 16 in. x 2 in. was rolled to fit into a stainless steel cylinder that was 11.5 in. tall with a diameter of 1.5 in. The cylinder was initially open at both ends. Two ends with tube connection were then bolted on to the cylinder.
  • This fixture was then connected to an apparatus comprising a pump, a supply cylinder of dry R-134a, a flow meter and a loop that bypassed the fixture.
  • the loop contained Celite that was saturated with water.
  • a Panometrics MIS2 probe for measuring the moisture in liquid refrigerants was attached in line with the fixture.
  • the apparatus with the refrigerant supply cylinder valves closed, was evacuated. The valves were then opened and liquid refrigerant fed to the pump and the pump turned on. In order to wet the refrigerant, the fixture was closed off and the refrigerant fed through the bypass loop. The bypass was then closed and the fixture opened. The reading on the probe was initially off scale indicating a very high moisture level. After a few minutes the probe registered 380 ppm. After three hours the concentration of water in the R-134a was measured to be 100 ppm.
  • a rigid, open-celled foam was blown into a cylinder that was 4 in. long and
  • the foam formulation contained a mixture of sodium polyacrylate and molecular sieve (7.25 grams each).
  • the cylinder was initially open at both ends. Two ends with tube connection were then bolted on to the cylinder.
  • This fixture was then connected to an apparatus comprising a pump, a supply cylinder of dry R-134a, a flow meter and a loop that bypassed the fixture.
  • the loop contained Celite that was saturated with water.
  • a Panometrics MIS2 probe for measuring the moisture in liquid refrigerants was attached in line with the fixture.
  • the fixture was closed off and the refrigerant fed through the bypass loop.
  • the bypass was then closed and the fixture opened.
  • the reading on the probe was initially off scale indicating a very high moisture level. After 6 minutes the probe registered 528 ppm. After 50 minutes the concentration of water in the R-134a was measured to be 86 ppm.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Drying Of Gases (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Detergent Compositions (AREA)

Abstract

la présente invention concerne des nouvelles compositions d'agents siccatifs faits de polymères superabsorbants, de tamis moléculaires et de mélanges de ces substances, des liants pour mousse de polyuréthane, mousse de polyisocyanurate,t des supports renfermant du cellulose. Est également décrit un procédé de séparation, de séchage et/ou de filtrage de mélanges chimiques. Les compositions et le procédé selon l'invention se prêtent à de multiples applications, par exemple pour extraire l'eau présente dans des mélanges chimiques tels que des réfrigérants (utilisés par exemple dans des circuits de climatisation de véhicules), dans l'air (par exemple dans les circuits de freinage de véhicules), dans le gaz naturel et les solvants de nettoyage (utilisés notamment pour la fabrication des semi-conducteurs et le nettoyage des conduites).
PCT/US1999/030064 1998-12-16 1999-12-16 Separation de l'eau et de melanges chimiques WO2000035562A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU21918/00A AU2191800A (en) 1998-12-16 1999-12-16 Process for separating water from chemical mixtures
EP99966357A EP1144090A3 (fr) 1998-12-16 1999-12-16 Separation de l'eau et de melanges chimiques

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11254698P 1998-12-16 1998-12-16
US60/112,546 1998-12-16
US29133999A 1999-04-14 1999-04-14
US09/291,339 1999-04-14

Publications (2)

Publication Number Publication Date
WO2000035562A2 true WO2000035562A2 (fr) 2000-06-22
WO2000035562A3 WO2000035562A3 (fr) 2001-09-07

Family

ID=26810080

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/030064 WO2000035562A2 (fr) 1998-12-16 1999-12-16 Separation de l'eau et de melanges chimiques

Country Status (3)

Country Link
EP (1) EP1144090A3 (fr)
AU (1) AU2191800A (fr)
WO (1) WO2000035562A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002051518A2 (fr) * 2000-12-27 2002-07-04 Stockhausen, Inc. Procede et appareil de deshydratation de l'huile moteur utilisant des polymeres superabsorbants
WO2005073646A1 (fr) * 2004-01-28 2005-08-11 Airsept, Inc. Separateur d'huiles presentant un mecanisme de vanne bidirectionnelle a utiliser avec une machine de recyclage de fluide frigorigene
CN106890630A (zh) * 2017-03-28 2017-06-27 中国天辰工程有限公司 一种高吸水量核﹣壳结构变色硅胶干燥剂的制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013566A (en) * 1975-04-07 1977-03-22 Adsorbex, Incorporated Flexible desiccant body
EP0359615A1 (fr) * 1988-09-01 1990-03-21 James River Corporation Of Virginia Fabrication de structures composites superabsorbantes
EP0594431A2 (fr) * 1992-10-23 1994-04-27 Matsushita Refrigeration Company Compresseur de réfrigérant et système de réfrigération avec ce compresseur
US5685897A (en) * 1995-07-06 1997-11-11 Laroche Industries, Inc. High strength, low pressure drop adsorbent wheel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013566A (en) * 1975-04-07 1977-03-22 Adsorbex, Incorporated Flexible desiccant body
EP0359615A1 (fr) * 1988-09-01 1990-03-21 James River Corporation Of Virginia Fabrication de structures composites superabsorbantes
EP0594431A2 (fr) * 1992-10-23 1994-04-27 Matsushita Refrigeration Company Compresseur de réfrigérant et système de réfrigération avec ce compresseur
US5685897A (en) * 1995-07-06 1997-11-11 Laroche Industries, Inc. High strength, low pressure drop adsorbent wheel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002051518A2 (fr) * 2000-12-27 2002-07-04 Stockhausen, Inc. Procede et appareil de deshydratation de l'huile moteur utilisant des polymeres superabsorbants
WO2002051518A3 (fr) * 2000-12-27 2003-02-20 Stockhausen Inc Procede et appareil de deshydratation de l'huile moteur utilisant des polymeres superabsorbants
US7033493B2 (en) 2000-12-27 2006-04-25 Stockhausen, Inc. Method and apparatus using super absorbent polymers for dehydration of oil
US7086238B2 (en) 2003-01-28 2006-08-08 Airsept, Inc. Oil separator with bi-directional valve mechanism for use with a refrigerant recycling machine
WO2005073646A1 (fr) * 2004-01-28 2005-08-11 Airsept, Inc. Separateur d'huiles presentant un mecanisme de vanne bidirectionnelle a utiliser avec une machine de recyclage de fluide frigorigene
CN106890630A (zh) * 2017-03-28 2017-06-27 中国天辰工程有限公司 一种高吸水量核﹣壳结构变色硅胶干燥剂的制备方法

Also Published As

Publication number Publication date
EP1144090A3 (fr) 2001-11-28
EP1144090A2 (fr) 2001-10-17
AU2191800A (en) 2000-07-03
WO2000035562A3 (fr) 2001-09-07

Similar Documents

Publication Publication Date Title
US6589444B2 (en) Process for separating water from chemical mixtures
US10493399B2 (en) Process for drying a gas stream comprising 2,3,3,3 tetrafluoropropene
JP2785870B2 (ja) 圧力スイング吸着法
WO2015130338A1 (fr) Procédé de régénération de milieu adsorbant utilisé pour extraire des liquides de gaz naturel du gaz naturel
WO2002004115A1 (fr) Adsorbant d'azote a liaison polymere
JP3213828B2 (ja) ＨＦＣ−３２、ＨＦＣ−１５２ａ用乾燥剤
US6101818A (en) Process for separating water from chemical mixtures
WO2015130339A1 (fr) Procédé de commande de processus pour extraire des liquides de gaz naturel à partir d'un gaz naturel
EP3030339A1 (fr) Procédé d'extraction de liquides de gaz naturel à partir de gaz naturel à l'aide d'un milieu absorbant comprenant un polymère macroporeux réticulé
US7759275B2 (en) Sorbent system for water removal from air
EP1144090A2 (fr) Separation de l'eau et de melanges chimiques
Toribio et al. Adsorption of water vapor by poly (styrenesulfonic acid), sodium salt: isothermal and isobaric adsorption equilibria
Shirey et al. SPME-adsorption versus absorption: which fiber is best for your application
MXPA01006080A (en) Process for separating water from chemical mixtures
EP3030340A1 (fr) Procédé d'extraction de liquides du gaz naturel à partir de gaz naturel au moyen d'un milieu adsorbant comprenant un polymère macroporeux partiellement pyrolysé
JPH08208212A (ja) 活性炭の製造方法
JPH08173799A (ja) 乾燥剤、その製造方法及びその用途
Meng et al. Synthesis of 4-vinylpyridine–divinylbenzene copolymer adsorbents for microwave-assisted desorption of benzene
Zhenghao et al. Adsorption characteristics of phenolic compounds onto a new hypercrosslinked polymeric resin containing the 2-carbonylbenzoyl group (ZH-01)
JP4378612B2 (ja) 有機化合物吸着用繊維状活性炭およびそれを用いた排ガス処理装置
JP3838676B2 (ja) プロピレンオキサイドの精製方法
Sobiesiak et al. Polymer-based carbon adsorbents obtained from copolymer of 4, 4'-bis (maleimidodiphenyl) methane and divinylbenzene for use in SPE
MXPA00004507A (en) Process for separating water from chemical mixtures
JPH0252043A (ja) 空気浄化剤
Izumi et al. Oxygen selectivity of calcined Na-A type zeolite

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH GM HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

WWE Wipo information: entry into national phase

Ref document number: 1999966357

Country of ref document: EP

WWE Wipo information: entry into national phase

Country of ref document: MX

Ref document number: PA/a/2001/006080

Ref document number: 1020017007540

Country of ref document: KR

ENP Entry into the national phase

Ref document number: 2000 587871

Country of ref document: JP

Kind code of ref document: A

AK Designated states

Kind code of ref document: A3

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH GM HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A3

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

WWP Wipo information: published in national office

Ref document number: 1999966357

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1020017007540

Country of ref document: KR

WWW Wipo information: withdrawn in national office

Ref document number: 1999966357

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

WWR Wipo information: refused in national office

Ref document number: 1020017007540

Country of ref document: KR

ENPW Started to enter national phase and was withdrawn or failed for other reasons

Ref document number: PI9916292

Country of ref document: BR

Free format text: PEDIDO CONSIDERADO RETIRADO, POR TER SIDO A FASE NACIONAL INTEMPESTIVA.