EP4240969A1 - Transport d'un fluide contenant un monomère (méth)acrylique au moyen d'une pompe - Google Patents

Transport d'un fluide contenant un monomère (méth)acrylique au moyen d'une pompe

Info

Publication number
EP4240969A1
EP4240969A1 EP21801559.2A EP21801559A EP4240969A1 EP 4240969 A1 EP4240969 A1 EP 4240969A1 EP 21801559 A EP21801559 A EP 21801559A EP 4240969 A1 EP4240969 A1 EP 4240969A1
Authority
EP
European Patent Office
Prior art keywords
liquid
pump
pump chamber
drive shaft
meth
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP21801559.2A
Other languages
German (de)
English (en)
Inventor
Tile GIESHOFF
Juergen Schroeder
Ulrich Hammon
Christian Rein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Publication of EP4240969A1 publication Critical patent/EP4240969A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/026—Details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/026—Selection of particular materials especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/0465—Ceramic bearing designs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • F04D29/0473—Bearings hydrostatic; hydrodynamic for radial pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/20—Oxide or non-oxide ceramics
    • F05D2300/22—Non-oxide ceramics
    • F05D2300/226—Carbides
    • F05D2300/2263—Carbides of tungsten, e.g. WC

Definitions

  • the present invention relates to a method for conveying a liquid F by means of a pump P, the liquid F containing at least 10% by weight of a (meth)acrylic monomer, the pump P having a pump chamber (3), the pump chamber (3) having at least one Contains a conveying element (4) for conveying the liquid F, the conveying element (4) is connected to a drive shaft (6) in such a way that the drive shaft (6) can transmit torque to the conveying element (4), the bearing of the drive shaft by means of at least two Plain bearing (5) in the pump chamber (3) takes place and the plain bearings (5) are made of tungsten carbide.
  • (meth)acrylic monomers stands for "acrylic monomers and/or methacrylic monomers”.
  • acrylic monomer stands for acrylic acid, esters of acrylic acid and/or acrylonitrile.
  • methacrylic monomer stands for methacrylic acid, esters of methacrylic acid and/or methacrylonitrile.
  • the (meth)acrylic monomers referred to in this document should include the following (meth)acrylic acid esters: hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, glycidyl acrylate, glycidyl methacrylate, methyl acrylate, methyl methacrylate, n-butyl acrylate, n-butyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, ethyl acrylate, ethyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, N,N-dimethylaminoethyl acrylate and N,N-dimethylaminoethyl methacrylate.
  • (Meth)acrylic monomers are important starting compounds for the production of polymers that are used, for example, as adhesives.
  • (Meth)acrylic acid is produced industrially predominantly by catalytic gas-phase oxidation of suitable C3/C4 precursor compounds, in particular of propene and propane in the case of acrylic acid or of isobutene and isobutane in the case of methacrylic acid.
  • suitable C3/C4 precursor compounds in particular of propene and propane in the case of acrylic acid or of isobutene and isobutane in the case of methacrylic acid.
  • propane, isobutene and isobutane other compounds containing 3 or 4 carbon atoms are also suitable as starting materials, for example isobutanol, n-propanol or the methyl ether of isobutanol.
  • Esters of (meth)acrylic acid can be obtained, for example, by reacting (meth)acrylic acid directly with the corresponding alcohols. However, in this case too, product mixtures are initially obtained, from which the (meth)acrylic esters have to be removed, for example by rectification and/or extraction.
  • the solvent can be either aqueous or an organic solvent.
  • the specific nature of the solvent is essentially immaterial in the present invention.
  • the content of (meth)acrylic monomers in solutions to be conveyed can be >20% by weight, or >40% by weight, or >60% by weight, or >80% by weight, or >90% by weight. , or >95% by weight, or >99% by weight.
  • the pump to be used should therefore be designed in such a way that, in addition to the intended inlet and outlet for the at least one (meth)acrylic monomer-containing Fluid F has no unintended discharge parts, leaks. At the same time, however, it should be such that undesirable radical polymerization of the (meth)acrylic monomers on mechanically stressed components (eg drive shaft bearings) is prevented.
  • mechanically stressed components eg drive shaft bearings
  • DE 102 28 859 A therefore recommends in its FIG. 1 to convey a liquid F containing at least one (meth)acrylic monomer to use a feed pump which has a pump chamber (3), a drive chamber (5) and a pump chamber and the drive chamber from one another separating space (4), and the space (4) is filled with a barrier medium, the drive shaft is not supported (8) within the pump space (3), the pressure of the barrier medium in the space (4) is greater than the pressure in the pump chamber (3) and than the pressure in the drive chamber (5).
  • the object of the present invention was to provide a new method for conveying a liquid F containing at least one (meth)acrylic monomer by means of a feed pump, with undesired radical polymerization of the (meth)acrylic monomers on mechanically stressed components (e.g. bearings of drive shafts) being prevented.
  • a method for conveying a liquid F by means of a pump P wherein the liquid F contains at least 10% by weight of a (meth)acrylic monomer, the pump P has a pump chamber (3), the pump chamber (3) has at least one conveying element ( 4) contains for conveying the liquid F, the liquid F is supplied to the pump chamber (3) with an input energy, the liquid F leaves the pump chamber (3) with an output energy that is greater than the input energy, the conveying element (4) with is connected to a drive shaft (6) in such a way that the drive shaft (6) can transmit a torque to the conveying element (4), and the drive shaft is supported by means of at least two plain bearings (5) in the pump chamber (3), characterized in that the Plain bearings (5) are made of tungsten carbide.
  • FIG. 1 of this document shows a schematic illustration of a pump P to be used according to the invention.
  • the reference symbols (1) and (2) designate the point of entry and exit of the liquid F into and out of the pump P, respectively.
  • the liquid F preferably contains at least 60% by weight, particularly preferably at least 80% by weight, very particularly preferably at least 90% by weight, of a (meth)acrylic monomer.
  • the preferred (meth)acrylic monomers are acrylic acid, methyl acrylate, ethyl acrylate, n-butyl acrylate, 2-ethylhexyl acrylate, 4-hydroxybutyl acrylate and cyclohexyl acrylate.
  • the temperature of the liquid is preferably from 10 to 120°C, more preferably from 40 to 100°C, most preferably from 50 to 90°C.
  • the liquid F advantageously contains a polymerization inhibitor, for example hydroquinone monomethyl ether, phenothiazine, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl, hydroquinone and N,N'-di-sec-butyl-p-phenylenediamine.
  • a polymerization inhibitor for example hydroquinone monomethyl ether, phenothiazine, 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl, hydroquinone and N,N'-di-sec-butyl-p-phenylenediamine.
  • the amount of polymerization inhibitor in the liquid F is preferably from 0.001 to 1% by weight, more preferably from 0.003 to 0.3% by weight, most preferably from 0.01 to 0.1% by weight.
  • Pumps P preferred according to the invention are centrifugal pumps and side channel pumps.
  • centrifugal pumps and side channel pumps work according to the dynamic principle.
  • a rotating impeller (the pumping element connected to the drive shaft) transfers work in the form of kinetic energy from the impeller to the liquid F to be pumped. After the impeller, the kinetic energy is mainly converted back into static pressure (pressure energy, law of conservation of energy) in a diffuser and/or in the volute casing.
  • the impeller is a simple disc on which blades are attached.
  • the blades create blade channels, the cross-section of which normally increases greatly from the inside to the outside due to the increasing circumference. As much liquid F to be conveyed can be thrown away through these vane channels as can flow into the middle of the impeller. In contrast to the piston pump, the liquid F to be pumped in the centrifugal and side channel pump flows continuously during operation.
  • closed impellers In contrast to open impellers, closed impellers can also be used.
  • the blade channels are simply covered by a second disc that has an opening in the middle.
  • the curvature of the blade usually runs like the natural path of a water droplet on a rotating, round, smooth disk from the point of view of a co-rotating observer if the water droplet falls onto the center of the disk.
  • This blade shape is called "Backward-curved” blade is referred to.
  • blades that are slightly forward-curved and also helical, i.e. twisted, backward-curved blades, which protrude with their cutting edges into the impeller inlet and capture the liquid F like a ship's propeller can also be used.
  • a centrifugal pump (a centrifugal pumping chamber) consists of the pump housing and the impeller rotating in the pump housing and equipped with blades.
  • the liquid F enters axially through the suction port. It is deflected radially outwards by the centrifugal force and accelerated by the impeller to high speed.
  • the pump housing has the task of catching the liquid F from all vane channels so that it can be collected and passed on through the pressure outlets. At the same time, however, the pump housing has the task of converting the kinetic energy of the liquid F into pressure. For this purpose, use is usually made of the fact that an enlargement of the cross section reduces the speed of the liquid F and thus causes an increase in pressure.
  • Two designs of the pump housing are common to increase the cross-section. Volute casings are often used in single-stage pumps or behind the last stage of multi-stage centrifugal pumps.
  • stationary diffusers are also used, particularly in the case of multi-stage pumps.
  • the guide wheel is installed in the pump housing and is designed as an annular space. It encloses the impeller. Guide vanes are arranged in the guide wheel, which form channels that widen towards each other towards the outside.
  • the liquid F is not thrown directly into the pump housing, but first flows through the vane channels of the diffuser. By expanding in the direction of flow, they in turn cause the flow rate to slow down and the resulting pressure build-up.
  • the direction of the diffuser channels is normally opposite to the direction of the impeller channels and corresponds to the direction of the discharge velocity of the pumped liquid from the impeller on the inner circumference of the diffuser.
  • Another task of the diffuser is to collect the liquid F in two-stage centrifugal pumps and to lead it to the inlet of the second stage.
  • liquid F is first collected in diffuser before it can get into spiral housing.
  • the pump chamber of the method according to the invention can also be designed as a multi-stage centrifugal pump, as is described in Pumps in the Fire Service, Part 1, Introduction to Hydromechanics, Operation of Centrifugal Pumps, 4th edition 1998, Verlag W. Kohlhammer, Berlin. Single-stage centrifugal pumps are preferred according to the invention.
  • a narrow impeller with open blades rotates in the casing, in which a side channel runs around most of the circumference next to the blades.
  • the liquid to be pumped does not enter the axis, but rather through a slit in the end face of the vane chambers, with the liquid already in the chambers being forced outwards by centrifugal force.
  • the flow at the casing wall is deflected into the side channel, where it describes a helical path and, after a short distance, re-enters the impeller. This process is repeated e.g. 10 to 50 times for a liquid particle on the way from the suction to the pressure connection, depending on the throughput.
  • the liquid In the vane chambers, the liquid is accelerated not only in the radial direction but also to the peripheral speed of the wheel. With this peripheral speed and the superimposed circulation speed, the liquid particle passes from the impeller into the side channel. On the further helical path, the circulation component is slowed down only slightly by wall friction, while the circumferential component is slowed down considerably and essentially only as a result of the pressure build-up. The loss of kinetic energy of the resulting flow is compensated again and again in the impeller.
  • the drive shaft (6) can be driven by a magnetic coupling or a canned motor.
  • the magnetic coupling uses the attraction and repulsion forces between permanent magnets in both coupling halves for non-contact and non-slip torque transmission. Between the two magnet-equipped coupling halves there is a can that separates the product space and the environment.
  • the canned motor is an electric motor in which the rotor and stator are separated by a can. The can is located in the gap between the motor's stator and rotor.
  • the drive shaft (6) is located entirely in the pump chamber (3). This eliminates the need for a seal between the drive shaft (6) and the pump chamber (3). However, the drive shaft (6) must be mounted in the pump chamber (3) using plain bearings (5).
  • a plain bearing is generally understood to be a machine element for supporting or guiding machine parts that are movable relative to one another, with it absorbing the forces that occur and dissipating them to the housing, component or foundation.
  • the present invention is based on the finding that silicon carbide, which is frequently used as a material for plain bearings, promotes the undesired polymerization of (meth)acrylic monomers. On the other hand, this effect does not occur when tungsten carbide is used for this purpose.
  • Tungsten carbide can be made directly from the elements.
  • the carbon atoms are stored between the lattice sites of the tungsten.
  • a gaseous product gas mixture with the following composition was generated by two-stage catalytic gas-phase oxidation of propylene with molecular oxygen:
  • Residual amount up to 100% by weight Propionic acid, furfural, propane, propene, nitrogen, oxygen and carbon oxides.
  • This gaseous product gas mixture was cooled in a spray cooler (direct cooler, quench) by injecting crude acrylic acid (4000 l/h) (the temperature of the crude acrylic acid was 95° C.; the crude acrylic acid used for direct cooling contained 1.1 as starting concentrations wt .-% water and 0.1 wt .-% phenothiazine as a polymerization inhibitor).
  • the crude acrylic acid used for quenching was circulated by means of a circulating pump via a heat exchanger and repeatedly readjusted to 95.degree.
  • a centrifugal pump of the type MKP 32-160 (CP-Pumpen AG, Zofingen, Switzerland) was used as the circulating pump in the quench. Pump room and drive room are separated by a metal wall. The drive in the pump room was magnetically coupled. The drive shaft was mounted horizontally in the pump room with a plain bearing made of silicon carbide.
  • the cooled gas mixture leaving the spray cooler and containing the acrylic acid to be separated off was fed below the bottom tray into a rectification column which was equipped with 27 bubble-cap trays and a spray condenser at the top of the column.
  • the temperature at the top of the column was 20°C and the bottom temperature of the rectification column was 90°C.
  • the condensate obtained in the spray condenser which consisted mainly of water, was discharged and, after addition of 0.03% by weight of hydroquinone and cooling in a heat exchanger, as a spray liquid at a temperature of 17° C. via the spray condenser as reflux back to the top column tray upset.
  • the reflux ratio was 4.
  • the crude acrylic acid obtained at the bottom of the rectification column was partly discharged (430 g/h), partly (250 g/h) after the addition of 0.1% by weight of phenothiazine to inhibit polymerization of the rectification column on the 13th tray of the column (Calculated from below) recycled and partly (about 15 l / h) first passed through a heat exchanger and then at a temperature of 100 ° C on the z. Bottom of the column (calculated from below) recycled to adjust the column temperature. A further portion of the crude acrylic acid obtained at the bottom of the column was fed to the quench at a temperature of 102° C. via a heat exchanger upstream of the quench to equalize the liquid.
  • the discharged crude acrylic acid contained 97.2% by weight of acrylic acid, 1.6% by weight of acetic acid, 0.024% by weight of propionic acid, 0.4% by weight of maleic acid, 0.005% by weight of acrolein, 0.02% by weight % furfural and 1.2% by weight water and 0.05% by weight phenothiazine and 0.03% by weight hydroquinone.
  • the centrifugal pump was blocked by polymer formation within less than 10 hours of operation.
  • the procedure is as in example 1.
  • the silicon carbide plain bearings are replaced by tungsten carbide plain bearings.
  • the process can be operated without interruption.
  • SiC silicon carbide
  • WC tungsten carbide
  • MEHQ hydroquinone monomethyl ether
  • SiC silicon carbide
  • WC tungsten carbide
  • MEHQ hydroquinone monomethyl ether
  • Silicon carbide destabilizes significantly more than tungsten carbide.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

La présente invention concerne un procédé de transport d'un fluide F au moyen d'une pompe P, le fluide F contenant au moins 10 % en poids d'un monomère (méth)acrylique, la pompe P comportant une chambre de pompe (3), la chambre de pompe (3) contenant au moins un élément de transport (4) pour transporter le fluide F, l'élément de transport (4) étant relié à un arbre d'entraînement (6) de sorte que l'arbre d'entraînement (6) puisse transférer un couple sur l'élément de transport (4), l'arbre d'entraînement étant supporté au moyen d'au moins deux paliers lisses (5) dans la chambre de pompe (3) et les paliers lisses (5) étant constitués de carbure de tungstène.
EP21801559.2A 2020-11-03 2021-11-02 Transport d'un fluide contenant un monomère (méth)acrylique au moyen d'une pompe Pending EP4240969A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20205447 2020-11-03
PCT/EP2021/080297 WO2022096422A1 (fr) 2020-11-03 2021-11-02 Transport d'un fluide contenant un monomère (méth)acrylique au moyen d'une pompe

Publications (1)

Publication Number Publication Date
EP4240969A1 true EP4240969A1 (fr) 2023-09-13

Family

ID=73059573

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21801559.2A Pending EP4240969A1 (fr) 2020-11-03 2021-11-02 Transport d'un fluide contenant un monomère (méth)acrylique au moyen d'une pompe

Country Status (7)

Country Link
US (1) US20230400016A1 (fr)
EP (1) EP4240969A1 (fr)
JP (1) JP2023548202A (fr)
KR (1) KR20230096108A (fr)
CN (1) CN116438379A (fr)
TW (1) TW202227718A (fr)
WO (1) WO2022096422A1 (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956841A (en) * 1957-01-30 1960-10-18 Westinghouse Electric Corp Bearing and mounting therefor
US5549459A (en) * 1993-12-30 1996-08-27 Westinghouse Electric Corporation Radial bearing assembly for a high intertia flywheel of a canned motor pump
US5674057A (en) * 1995-03-03 1997-10-07 Westinghouse Electric Corporation Submersible canned motor mixer pump
DE29610799U1 (de) * 1996-06-20 1997-02-27 Klaus Union Armaturen Hydrodynamisches Gleitlager für einen Läufer einer Pumpe
JP2001114705A (ja) * 1999-10-12 2001-04-24 Nippon Shokubai Co Ltd 易重合性化合物の移送方法
DE10224341A1 (de) 2002-05-29 2003-07-17 Basf Ag Verfahren zur Herstellung von Acrylsäure und/oder deren Ester sowie von Propionsäure und/oder deren Ester im Verbund
DE10228859A1 (de) 2002-06-27 2004-01-15 Basf Ag Verfahren zum Fördern einer wenigstens ein (Meth)acrylmonomeres enthaltenden Flüssigkeit F
US9771938B2 (en) * 2014-03-11 2017-09-26 Peopleflo Manufacturing, Inc. Rotary device having a radial magnetic coupling

Also Published As

Publication number Publication date
JP2023548202A (ja) 2023-11-15
CN116438379A (zh) 2023-07-14
US20230400016A1 (en) 2023-12-14
WO2022096422A1 (fr) 2022-05-12
KR20230096108A (ko) 2023-06-29
TW202227718A (zh) 2022-07-16

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