WO2000071226A1 - Appareil de filtration sous pression et procede utilisant une chambre de depressurisation et materiau de transport - Google Patents

Appareil de filtration sous pression et procede utilisant une chambre de depressurisation et materiau de transport Download PDF

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Publication number
WO2000071226A1
WO2000071226A1 PCT/US2000/014182 US0014182W WO0071226A1 WO 2000071226 A1 WO2000071226 A1 WO 2000071226A1 US 0014182 W US0014182 W US 0014182W WO 0071226 A1 WO0071226 A1 WO 0071226A1
Authority
WO
WIPO (PCT)
Prior art keywords
phase material
solid phase
filtration unit
chamber
pressure
Prior art date
Application number
PCT/US2000/014182
Other languages
English (en)
Other versions
WO2000071226A9 (fr
Inventor
Jon O. Beard
John C. Rogers
Original Assignee
Baker Hughes Incorporated
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 Baker Hughes Incorporated filed Critical Baker Hughes Incorporated
Priority to US09/979,339 priority Critical patent/US6655531B1/en
Priority to BR0010920-7A priority patent/BR0010920A/pt
Priority to AU51572/00A priority patent/AU5157200A/en
Priority to MXPA01012034A priority patent/MXPA01012034A/es
Priority to KR1020017015075A priority patent/KR20020066369A/ko
Priority to EP00936224A priority patent/EP1225964A1/fr
Priority to CA002373162A priority patent/CA2373162A1/fr
Publication of WO2000071226A1 publication Critical patent/WO2000071226A1/fr
Publication of WO2000071226A9 publication Critical patent/WO2000071226A9/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/60—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for washing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
    • B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
    • B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/80—Accessories
    • B01D33/804—Accessories integrally combined with devices for controlling the filtration
    • B01D33/808—Accessories integrally combined with devices for controlling the filtration by pressure measuring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/20—Pressure-related systems for filters
    • B01D2201/202—Systems for applying pressure to filters

Definitions

  • This invention relates to a filtration device and associated method for separating a slurry into solid and liquid phases More particularly, this invention relates to a pressure filtration device and associated method for continuously separating solid phase material from a slurry and rapidly depressurizing that material
  • filtration or centrifugal separation include gravitational, vacuum-assisted and pressure filtration
  • crystals of terephthalic acid are conventionally separated from a slurry using a rotary vacuum filtration unit
  • the filtration unit has a cylindrical filter drum rotatably mounted inside a housing As the slurry is fed into the filtration unit housing, a pressure differential is created inside the filter to move the liquid portion of the slurry through the filter media The crystals are deposited in a layer on the outer cylindrical surface of the drum
  • the solid material removed from the filter media typically as a cake of solid phase material, prior to subsequent processing or disposal
  • a jet of pressurized gas removes the solid material from the filter media and pushes that material to a discharge outlet.
  • certain processes may require that the solid material is discharged to lower pressure (such as atmospheric conditions) for downstream processing.
  • pressure differential in the filtration unit it may also be desired that the pressure differential in the filtration unit not be significantly disrupted.
  • U.S. Patent Number 5,093,001 discloses a pressurized filtration unit that has a pair of valves at the output to provide for the discharge of material. This patent is incorporated by reference herein. That configuration, however, is not sufficient to solve the pressure control problem and to maintain a high level of throughput of material through the filtration unit.
  • U.S. Patent Numbers 5,589,079 and 5,470,473 disclose a pair of valve units and hoppers that provide for batch processing of solid material from a pressurized filtration unit. These patents are incorporated by reference herein. Each valve unit may have a dome-shaped valve member. In operation, solid material is discharged from the filtration unit into a first hopper.
  • a valve unit attached to the first hopper seals that hopper while the pressure is equalized between the first hopper and the second hopper. That pressure is intermediate the initial pressure and the final, lower pressure. After the pressure is equalized between the hoppers, the solid material is then transferred to the second hopper. The second hopper is depressurized to the final, lower pressure, and then the solid material is discharged to a storage vessel or conveyer. While the disclosed apparatus and method are superior to prior devices and methods, that apparatus and method are limited to batch processing of solid material. The multi-stage, batchwise processing requirements create a bottleneck that preclude high speed, continuous throughput of material. The valve units and pressure equalization equipment also require frequent maintenance to keep that equipment working efficiently.
  • An assembly for continuously recovering solid phase material from a slurry comprises, in accordance with the present invention, a pressurized filtration unit including a vessel having filter media for separating the solid phase material from the slurry.
  • the filtration unit has a slurry input and, optionally, a source of inert gas.
  • a liquid outlet discharges liquid phase material from that unit. Gas can also be discharged through the liquid outlet, depending on the design of the filtration unit.
  • a solids outlet discharges solid phase material from the filtration unit.
  • the filtration unit can optionally include a washing apparatus for dispensing a washing fluid or liquor onto a cake of mate ⁇ al that is deposited on the filter media. The washing fluid is displaces other liquids and/or impurities in the cake.
  • the depressurizing chamber has a lower pressure than the filtration unit to facilitate subsequent processing of that material.
  • that material is directly and rapidly depressurized to the lower pressure of that chamber.
  • the rapid depressurization can cause "flashing" of the solid phase material, which removes residual liquid, gas and volatile substances from that material.
  • the depressurizing chamber may further include one or more outlets for releasing the vapor, gas and/or volatile substances from that chamber.
  • the depressurizing chamber can contain an inert gas to stabilize reactive or otherwise unstable solid phase material. Any suitable conveyance can remove the solid phase material from the chamber for subsequent processing, such as drying.
  • the mate ⁇ al transport generally includes an inlet for receiving solid phase material from the solids outlet of the filtration unit. That material is discharged under pressure into the material transport inlet. It is a feature of the present invention that the material transport maintains the pressure difference between the filtration unit and the depressurizing vessel. The solid phase material is transported to an outlet where it is discharged into the depressurizing chamber. That material is rapidly depressurized as it is exposed to the lower pressure of the depressurizing chamber.
  • a system of one or more filtration units, depressurizing units and material transports can further include one or more chemical reactors or precipitators that provide a source of slurry to the filtration units
  • One or more downstream conveyors and/or dryers can aid in further processing of the solid phase material
  • the conveyor may be a screw conveyor or other type of conveyance
  • a method for separating solid phase material from a slurry includes the steps of (a) providing a filtration unit having a vessel maintained at a first pressure and having filter media, (b) introducing a slurry to the vessel, (c) separating the slurry into a solid phase material and a liquid phase material, (d) continuously transporting the solid phase material to a depressurizing chamber while maintaining the pressure difference between the filtration unit and the chamber, and (e) rapidly depressurizing the solid phase material as it enters the depressurizing chamber
  • the solid phase material is maintained at substantially the first pressure until it enters the depressurizing chamber, although a minor amount of controlled pressure leakage during transportation of the solid phase material may be permitted
  • Further steps include (f) providing the slurry from a chemical reactor, and (g) conveying the depressurized solid phase material to a dryer BRIEF DESCRIPTION OF THE DRAWING
  • FIG 1 is a side view of a pressurized filtration unit with portions of the vessel wall cut away
  • FIG 2 is a flow diagram of one embodiment of a pressurized filtration system
  • the assembly includes a filtration unit 10 with a solids outlet 12 for discharging solid phase material separated from the slurry by filtration unit 10.
  • a liquids outlet 1 1 provides for the discharge of liquid phase material and, optionally, gaseous material.
  • a material transport 15 is connected to filtration unit 10 at solids outlet 12.
  • the filtration unit 10 and material transport 15 can be interconnected by an adapter 14.
  • Such an adapter 14 is particularly useful for retrofitting filtration units.
  • Material transport 15 is connected at its downstream side to a depressurizing chamber 20.
  • Chamber 20 preferably has one or more outlets 25 for the discharge of vapor, gas and/or volatile substances (generally "vapor") from that chamber 20.
  • Chamber 20 can be further connected to a conveyer and/or dryer (not shown) for further processing of the solid phase material.
  • Filtration unit 10 includes a vessel 13 for containing the slurry 5 and filter media 8.
  • the filtration unit 10 can be any device for separating the slurry 5 into solid phase and liquid phase materials. Because filtration unit 10 is pressurized, it is advantageously either cylindrical or spherical, although other configurations are possible.
  • filtration unit 10 can be a pressurized, rotary drum filtration unit as disclosed in U.S. Patent Nos. 5,589,079; 5,470,473 and 2,352,303, the disclosures of which are incorporated by reference herein.
  • Slurry 5 is provided to filtration unit 10 from a suitable source, such as, for example, a chemical reactor or precipitation unit (not shown). The slurry 5 is fed into the filtration unit 10 through an inlet 3.
  • the inlet 3 can be located and structured to introduce the slurry 5 into the unit 10 according to the design and function of that particular filtration unit, which is well known to those skilled in the art.
  • Other pressurized filtration units such as pressurized disc filter units, are also suitable for use in the present invention.
  • Filtration unit 10 is pressurized to facilitate separation of the slurry 5 into solid phase material and liquid phase material by filter media 8.
  • Filtration unit 10 is pressurized, according to the design of that unit. For example, referring to Figure 1 , filtration unit 10 is pressurized from a source 30 of pressurized gas, such as an inert gas. Other methods of pressurizing filtration unit 10 are possible, such as introducing a pressurized slurry into unit 10.
  • the filter media 8 separates the slurry into liquid phase and solid phase material.
  • Filter media 8 is selected according to the slurry being separated.
  • filter media 8 can be a layer of cloth fiber or stainless steel provided along the outer surface of a steel drum.
  • the filter media is preferably capable of withstanding elevated temperature as well as elevated pressure.
  • liquid phase material means liquid separated from the slurry, although that liquid may contain some suspended solid material.
  • solid phase material means the material that is separated from that slurry by the filter media 8, such as a "cake” that is deposited on that filter media.
  • the solid phase material may also contain substantial liquid, such as, for example, liquid that is not separated from the solid phase material and/or washing fluid.
  • the temperature of the solid phase material can be greater than the atmospheric boiling point of the liquid contained in that material.
  • the liquid rapidly vaporizes as the pressure, or pressure and temperature, are lowered.
  • a pressurized solid phase material that contains water and has a temperature greater than 212°F
  • Other pressurized, heated, liquid-containing solid phase material can be processed using this equipment.
  • Filtration unit 10 may optionally include a washing apparatus 7 for dispensing a washing fluid or liquor onto a cake that is deposited on filter media 8 during the filtration process.
  • the washing fluid can be ejected under pressure through the cake or solid phase material and into the filter.
  • the washing fluid may displace residual moisture in the cake, remove impurities in the cake and/or displace the liquid in the cake with the washing fluid.
  • the washing fluid can be water that is used to displace acetic acid from terephthalic acid crystals before that material is discharged from the solids outlet 12.
  • a suitable washing apparatus may include, for example, headers spanning vessel 13 that eject the washing liquid into the cake Other washing fluid and apparatuses are possible
  • the solid phase material can be discharged from the filter media by any suitable mechanism, as will be appreciated by those skilled in the art
  • a jet of pressurized gas from inside the rotating cylindrical filter can push a deposited cake from the outer surface of the filter media and into the solids outlet 12
  • the cake can be mechanically removed from the filter media 8 by a scraper or similar device (not shown)
  • Other apparatuses for discharging solid phase material from the filtration unit are possible and within the scope of the present invention
  • Material transport 15 has an inlet 16 for receiving solid phase material from the solids outlet 12 of the filtration unit 10 Because inlet 16 is in communication with filtration unit 10, that inlet is pressurized Material transport 15 moves solid phase material to an outlet 18 The movement of solid phase material is preferably continuous such that that material moves from the inlet to the outlet without stepwise decompression or equalization of pressure between the filtration unit 10 and the depressurizing chamber 20 Material transport 15 maintains the pressure difference between the filtration unit 10 and the depressurizing chamber 20 while the solid phase material is being continuously moved through that apparatus
  • material transport 15 can be a rotary valve That valve has a plurality of rotatably mounted vanes 19 As solid phase material is deposited between the vanes, it is moved to outlet 18 Vanes 19 preferably sealmgly engage the inside surfaces 17 of the rotary valve to maintain the pressure difference between the filtration unit 10 and the depressurizing chamber 20.
  • Vanes 19 can also permit a minor amount of controlled leakage of pressure past those vanes, such that the cake on the filter media 8 is not displaced and such that the pressure difference is maintained between the filtration unit 10 and the depressurizing chamber 20.
  • Other material transports 15 are possible.
  • Material transport 15 is operated by any suitable mechanism.
  • material transport 15 is operated by drive 40 and bearing assembly and driveshaft 41.
  • Drive 40 may be, for example, an electric motor or combustion engine or other device for providing mechanical power to material transport 15.
  • Depressurizing chamber 20 has a solids inlet 22 for receiving solid phase material transported from the filtration unit 10. Side walls 24 contain the solid phase material as it enters, or is exposed to, the lower pressure in the depressurizing chamber 20.
  • the lower pressure of chamber 20 is preferably about atmospheric pressure, although higher and lower pressures can be used in chamber 20.
  • Depressurizing chamber 20 has at least one outlet 25 for discharging vapor that is formed upon exposure of the solid phase material to the lower pressure in that chamber.
  • An outlet 25 can be vented to the atmosphere or connected to a storage and/or recovery system (not shown). Such a system can aid in the cleaning and recovery of gases or vaporized liquids that are released from the depressurizing tank 20.
  • Depressurizing chamber 20 can, optionally, contain a gas, such as an inert gas, to limit the reactivity of solid phase material and/or to blanket the process to prevent ignition.
  • a gas such as an inert gas
  • depressurizing chamber 20 is connected to a source 30 of an inert gas, such as nitrogen, argon, helium or carbon dioxide.
  • an inert gas such as nitrogen, argon, helium or carbon dioxide.
  • the gas is selected according to the reactivity of the solid phase material.
  • a slurry filtration system is provided.
  • One or more filtration units 10 can be connected to one or more material transports 15 and one or more depressurizing chambers 20.
  • a source 1 provides slurry 5 to filtration units 10.
  • Source 1 can include a chemical reactor, precipitation unit, extraction unit, waste processor, or other suitable supply of a slurry containing solid and liquid phase materials.
  • Each filtration unit 10 is connected to a material transport 15. Material transports 15 move solid phase material to a common depressurizing chamber 20, although multiple depressurizing chambers 20 could also be used.
  • Solid phase material is conveyed from depressurizing chamber 20 via a conveyer 50 (such as a screw conveyor or other mechanism adapted to transport that material) to a dryer or other solid phase material processing equipment 60.
  • Conveyer 50 and equipment 60 are preferably adapted for continuous transport and processing.
  • the rate of operation of conveyor 50 can be adjusted during use in accordance with the slurry feed rate and output rate of solid phase material.
  • Other configurations of the system are possible.
  • a method for separating solid phase material from a slurry includes providing a filtration unit 10 having a vessel 13.
  • the vessel 13 is maintained at a first pressure.
  • the vessel contains filter media 8.
  • a slurry 5 is introduced into vessel 13 through an inlet 3.
  • the slurry 5 can be provided from any suitable source 1 , such as a chemical reactor, precipitator, extraction unit, waste processor, or other suitable supply of a slurry containing solid and liquid phase materials.
  • Slurry 5 is separated into a solid phase material and a liquid phase material using filter media 8.
  • the solid phase material may be washed.
  • the solid phase material is then transported to a depressurizing chamber while maintaining the pressure difference between the filtration unit and that chamber.
  • the solid phase material is preferably continuously moved or transferred from the filtration unit 10 to the depressurizing chamber 20 to provide for continuous filtration and processing of solid phase material.
  • the solid phase material is directly and rapidly depressurized as it enters the depressurizing chamber, without the need for pressure equalizing equipment that is required in other methods.
  • the solid phase material is preferably maintained at substantially the first pressure until it enters the depressurizing chamber.
  • the solid phase material may be partially depressurized while it is transported from the filtration unit to the chamber.
  • the depressurized solid phase material is conveyed from depressurizing chamber by any suitable conveying apparatus. Subsequent steps can include drying the solid phase material and/or providing that material to other equipment for additional processing or disposal.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Filtration Of Liquid (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

L'invention concerne un ensemble permettant de séparer un matériau en phase solide d'une suspension épaisse. Cet ensemble comprend une unité de filtration sous pression contenant un réceptacle et une couche filtrante. Une suspension (5) alimente l'unité (10) de filtration dans laquelle la suspension est séparée en un matériau en phase solide et un matériau en phase liquide. L'unité de filtration (10) est pourvue d'une sortie (12) de solides permettant d'évacuer le matériau en phase solide vers un matériau (15) de transport. Ce matériau (15) déplace le matériau en phase solide vers une chambre (20) de dépressurisation, laquelle chambre présente une pression inférieure à celle de l'unité (10) de filtration. Au fur et à mesure que le matériau en phase solide pénètre dans la chambre (20) de dépressurisation, celui-ci est exposé à la pression inférieure de la chambre. Le matériau (15) de transport maintient la différence de pression entre l'unité (10) de filtration et la chambre (20). Le matériau en phase solide dépressurisé peut ensuite être conduit vers d'autres installations afin d'être séché ou afin d'être soumis à tout autre traitement.
PCT/US2000/014182 1999-05-24 2000-05-23 Appareil de filtration sous pression et procede utilisant une chambre de depressurisation et materiau de transport WO2000071226A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US09/979,339 US6655531B1 (en) 2000-05-23 2000-05-23 Pressure filtration device
BR0010920-7A BR0010920A (pt) 1999-05-24 2000-05-23 Dispositivo de filtração por pressão e método empregando uma câmara de despressurização e transporte de material
AU51572/00A AU5157200A (en) 1999-05-24 2000-05-23 Pressure filtration device and method employing a depressurizing chamber and material transport
MXPA01012034A MXPA01012034A (es) 1999-05-24 2000-05-23 Dispositivo de filtracion de presion y metodo que emplea una camara de despresurizacion y transporte de material.
KR1020017015075A KR20020066369A (ko) 1999-05-24 2000-05-23 가압여과장치 및 감압챔버와 재료이송수단을 이용한 방법
EP00936224A EP1225964A1 (fr) 1999-05-24 2000-05-23 Appareil de filtration sous pression et procede utilisant une chambre de depressurisation et materiau de transport
CA002373162A CA2373162A1 (fr) 1999-05-24 2000-05-23 Appareil de filtration sous pression et procede utilisant une chambre de depressurisation et materiau de transport

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13564099P 1999-05-24 1999-05-24
US60/135,640 1999-05-24

Publications (2)

Publication Number Publication Date
WO2000071226A1 true WO2000071226A1 (fr) 2000-11-30
WO2000071226A9 WO2000071226A9 (fr) 2002-06-20

Family

ID=22468977

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/014182 WO2000071226A1 (fr) 1999-05-24 2000-05-23 Appareil de filtration sous pression et procede utilisant une chambre de depressurisation et materiau de transport

Country Status (8)

Country Link
EP (1) EP1225964A1 (fr)
KR (1) KR20020066369A (fr)
CN (1) CN1423574A (fr)
AU (1) AU5157200A (fr)
BR (1) BR0010920A (fr)
CA (1) CA2373162A1 (fr)
MX (1) MXPA01012034A (fr)
WO (1) WO2000071226A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001049647A1 (fr) * 1999-12-29 2001-07-12 Inca International S.P.A. Procede de recuperation d'acide terephthalique purifie (pta)
US6639104B2 (en) 1999-12-10 2003-10-28 Inca International S.P.A. Process for the recovery of purified terephthalic acid (PTA)
EP1402942A1 (fr) * 2001-05-15 2004-03-31 Mitsubishi Chemical Corporation Procede de production d'un compose
DE102006058163A1 (de) * 2006-12-09 2008-06-19 Lurgi Ag Verfahren und Anlage zur Herstellung von Roh-Terephthalsäure
WO2009024872A2 (fr) * 2007-05-31 2009-02-26 Dow Italia S.R.L. Procédé amélioré de récupération d'acide téréphtalique
DE102012206590A1 (de) 2012-04-20 2013-10-24 Coperion Gmbh Verfahren zum Betrieb einer Zellenradschleuse sowie Zellenradschleuse zur Durchführung des Verfahrens
DE102013211197A1 (de) 2013-06-14 2014-12-18 Coperion Gmbh Zellenradschleuse sowie Fördereinrichtung zu einer derartigen Zellenradschleuse

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4179043A (en) * 1978-01-03 1979-12-18 Koppers Company, Inc. Rotary valve apparatus
US4279760A (en) * 1977-12-27 1981-07-21 Samuroh Yamamoto Process and apparatus for continuous cake filteration under pressure
US5093001A (en) * 1988-05-27 1992-03-03 Mitsui Petrochemical Industries, Ltd. Method for recovering crystals from slurry
US5175355A (en) * 1991-04-12 1992-12-29 Amoco Corporation Improved process for recovery of purified terephthalic acid
US5470473A (en) * 1994-02-17 1995-11-28 Baker Hughes Incorporated Rotary vacuum filtration drum with valved hopper cake treatment means
JPH11179115A (ja) * 1997-12-24 1999-07-06 Mitsui Chem Inc スラリーからの結晶回収方法および装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4279760A (en) * 1977-12-27 1981-07-21 Samuroh Yamamoto Process and apparatus for continuous cake filteration under pressure
US4179043A (en) * 1978-01-03 1979-12-18 Koppers Company, Inc. Rotary valve apparatus
US5093001A (en) * 1988-05-27 1992-03-03 Mitsui Petrochemical Industries, Ltd. Method for recovering crystals from slurry
US5175355A (en) * 1991-04-12 1992-12-29 Amoco Corporation Improved process for recovery of purified terephthalic acid
US5470473A (en) * 1994-02-17 1995-11-28 Baker Hughes Incorporated Rotary vacuum filtration drum with valved hopper cake treatment means
JPH11179115A (ja) * 1997-12-24 1999-07-06 Mitsui Chem Inc スラリーからの結晶回収方法および装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Derwent World Patents Index; AN 1999-496556, XP002145520 *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 12 29 October 1999 (1999-10-29) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6639104B2 (en) 1999-12-10 2003-10-28 Inca International S.P.A. Process for the recovery of purified terephthalic acid (PTA)
WO2001049647A1 (fr) * 1999-12-29 2001-07-12 Inca International S.P.A. Procede de recuperation d'acide terephthalique purifie (pta)
EP1402942A1 (fr) * 2001-05-15 2004-03-31 Mitsubishi Chemical Corporation Procede de production d'un compose
EP1402942A4 (fr) * 2001-05-15 2006-11-29 Mitsubishi Chem Corp Procede de production d'un compose
DE102006058163A1 (de) * 2006-12-09 2008-06-19 Lurgi Ag Verfahren und Anlage zur Herstellung von Roh-Terephthalsäure
WO2009024872A2 (fr) * 2007-05-31 2009-02-26 Dow Italia S.R.L. Procédé amélioré de récupération d'acide téréphtalique
WO2009024872A3 (fr) * 2007-05-31 2009-05-07 Dow Italia S R L Procédé amélioré de récupération d'acide téréphtalique
JP2010528100A (ja) * 2007-05-31 2010-08-19 ダウ イタリア ソチエタ レスポンサビリタ リミテ テレフタル酸の回収のための改善された方法
DE102012206590A1 (de) 2012-04-20 2013-10-24 Coperion Gmbh Verfahren zum Betrieb einer Zellenradschleuse sowie Zellenradschleuse zur Durchführung des Verfahrens
DE102013211197A1 (de) 2013-06-14 2014-12-18 Coperion Gmbh Zellenradschleuse sowie Fördereinrichtung zu einer derartigen Zellenradschleuse

Also Published As

Publication number Publication date
AU5157200A (en) 2000-12-12
KR20020066369A (ko) 2002-08-16
EP1225964A1 (fr) 2002-07-31
BR0010920A (pt) 2003-07-01
MXPA01012034A (es) 2002-05-06
WO2000071226A9 (fr) 2002-06-20
CA2373162A1 (fr) 2000-11-30
CN1423574A (zh) 2003-06-11

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