CA2225084A1 - Vacuum drying diaphragm filter press plates - Google Patents
Vacuum drying diaphragm filter press plates Download PDFInfo
- Publication number
- CA2225084A1 CA2225084A1 CA002225084A CA2225084A CA2225084A1 CA 2225084 A1 CA2225084 A1 CA 2225084A1 CA 002225084 A CA002225084 A CA 002225084A CA 2225084 A CA2225084 A CA 2225084A CA 2225084 A1 CA2225084 A1 CA 2225084A1
- Authority
- CA
- Canada
- Prior art keywords
- plate
- filter press
- shell
- core
- cake
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/001—Making filtering elements not provided for elsewhere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/21—Plate and frame presses
- B01D25/215—Construction of the filter plates, frames
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Filtering Materials (AREA)
Abstract
A filter press plate (10) having a one piece outer shell (26), rotationally molded out of cross-linked polyethylene, providing an inner cavity filled with a structural polyurethane foam core (24), wherein the outer shell (26) and inner core (24) are adapted to delaminate so that in the filtration area the shell can be expanded out by pressurizing the inner core (24) with a fluid.
Description
CA 0222~084 1997-12-18 W O97/00171 PCT~US96/11470 VA~UUM ~K~ lN~ DIAPHRAGM FILTER PRESS PLATES
~R~-RO~ND OF THE lNV~N LlON
DESCRIPTION
TECHNICAL FIELD
ThiR in~ention relates generally to filter pres_ plates, and more Rpeclfically to an impro~ed vacuum drying ~;aph~agm-type filter press plate.
R~ ROUND ART
There are many manufacturers of recessed filter plates and ~;arhragm filter plates on the market.
StAn~rd diap_ragm plate~ are m_nufactured by placing an ela_tomer co~er o~er a solid pla~tic core. The _olid pla~tic core contain_ the indi~idual drain channels and the corner drain piping. The elastomer covers the filtration area of the plate and i8 inflated with a fluid introduced through a pipe fitting in t_e core of the plate. The advantagee of a ~;~rhTagm plate are: shortened cycle timeR, better cake w~h;ng, and the ability of the press to take vari_ble feed 10A~;ng.
Disad~antages of current ~iArhTagm plates are many. The main reason ~;Aphragm plates are not used exclu~ively in the filter press market iB cost. The current method of mPn~fActure i~ very expen~i~e and requires a large capital cost for equipment. A diaphragm plate will usually cost four timee that of a stan~ard recessed plate. In addition to the initlal cost the two piece construction (elastomer ~;Arhragm and ~olid plate body) will have higher failure rate due to ~eparation of the pieces. Failure of the elastomer ~;ap~Tagm itself can alRo occur.
At lea_t one manufacturer of diaphragm plates ha~ suggested that a hot or cold liquid can be pumped into the core area. Thi~ is prim_rily used to preheat or precool the plate and diaphragm to stay within the material temperature limitations of the part, and not to actually transfer heat to or from the material being filtered.
CA 0222~084 1997-12-18 WO 97100171 PCTrUS96/11470 A non~ phragm teflon plate with steam coils in the plate has also been proposed. Thi~ was to heat and dry the cake solids after the filtration cycle was complete. This approach is problematic because after any initial drying the fllter cake loses volume and creates a gap between the cake and the filter press plate. This gap insulates the cake, and heat transfer and drying are limited only to applications where the cake remains in contact with the hot plate surface. Another manufacturer has tried to rotationally mold an outer shell and foam fill the inner section. HO.I_VeL, it is difficult to manufacture a continuous outer shell out of crosslink polyethylene, and incorporate drain ports from the filter area to the drain link6.
DISC~OSURE OF lNV .llON
The filter press plate of this invention can be distinguished from any other commercial filter plate in physical differ-nces and in functional differences. As oppo~ed to a stan~d diaphragm plate that has an exposed core with an ela~tomer ~;ap~agm covering the filtration area, the inventive plate is rotationally molded in one sealed hollow piece. The shell is placed in a second mold and urethane foamed under pressure. This results in a solid core inside the shell that can ~upport the pressures from the press closure and the filtration pressures.
Because no other plate is rotationally molded, no other plate is made from cross linked polyethylene.
The crosslinked other shell allows the plate to handle much higher temperatures than the propylene plastic plates currently available.
The inventive plate also has multiple pipe fittings molded into the shell. The pipe fittings allow the hot or cold fluid to be pumped into the core area to heat the shell.
The filter press plate functions like no other available plate. This is primarily due to its one piece cross link polyethylene shell and urethane core. As a CA 0222~084 1997-12-18 conventional ~;aph~agm plate, the one piece outer shell cannot separate in the f~ltration area because there is no joint or connection point. The cross linked polyethylene i~ not an ela~tomer and i~ much tougher and allows higher filtration temperatures.
Because the shell iR a thin sealed crosslinked piece, this allows heat tran~fer from any fluid pumped into the core to the filter cake. The heating fluid inflates the diaphragm and maintains contact with the cake as the cake loses ~olume during the drying process under vacuum.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 ie a perspective view of a complete rotomolded filter press plate of thi~ invention, without cloths.
Fig. 2 is a cutaway perspective view of a filter press plate of this invention.
Fig. 3 is a side elevation cross-sectional view of a filter press plate of this invention, showing the foamed core and outer shell.
Fig. 4 is an elevation view of a pipe fitting molded into the crosslinked shell, used to introduce or remove fluids form the core area.
BEST MODE FOR CARRYING O~T THE lNv~r.~lON
Fig. 1 i6 a perspective view of a complete rotomolded filter press plate 10 of this invention, without cloths. Filtration area 12 of the plate i6 ribbed to allow filtrate to flow to the four corner drain ports.
This i8 also the area that delaminate~ from the core when core pressure is applied and diaphragms out. Heat transfer to the cake occur~ in this area. Drain porting 14 allow~ filtrate to leave each plate and flow to the fixed end of the pre~s to exit. Sludge is pumped to each plate cavity through feed port 16, and is cont~;ne~ by sealing edge 18 of the plate. Molded in pipe fittings 20 allow fluids to be introduced or removed from the plate CA 0222S084 l997-l2-l8 W O 97/00171 PCTrUS96/11470 core (bottom connections not shown). Molded in drain pa~sages 22 allow filtrate to get to the drain ports.
Fig. 2 is a cutaway perspective view of a filter press plate 10 of this invention, illustrating the solid foam core 24 of the plate, drain passages 22, and molded in pipe fittings 20.
~ ig. 3 is a side elevation cross-sectional view of filter press plate 10 of this invention, showing the foam core 24 and outer shell 26.
Fig. 4 is an elevation view of a pipe fitting 20 molded into the crosslinked shell 26, used to introduce or remove fluids form the core area.
The invention provides a one piece outer shell, ~l~phragm recessed filter press plate. The outer shell i6 rotationally molded out of cross linked polyethylene. The inner cavity is filled with a structural polyurethane foam. The outer shell and the inner core foam delaminate 80 that in the filtration area the shell can be expanded out by pressurizing the inner core with a fluid. This eYr~nA;ng of the outer shell makes the plate a diaphragm filter press plate. Conventional diaphragm plates utilize an elastomer diaphragm fitted to a solid plastic core.
This design is not one piece and fail6 when the diaphragm separates from the core.
In the rotomolding of the ehell, internal drain passages are molded into the shell with pin inserts that are removed prior to opening the mold. Thi6 leaves molded in drain pipes that do not compromise the sealed shell of the part.
This invention provides the ability to pump hot or cold fluids into the core area of the plate. Metal pipe inserts are molded into the outer edge of the one piece shell during the manufacturing proce~s. Fluids pumped into the ~ealed core area heat or cool the shell of the plate. This in turn heat6 or c0016 the filter cake held inside each plate cavity. In the case of heating, hot fluid is pumped through the shell under pressure.
While the filter press is still in the closed position, a .
CA 0222~084 1997-12-18 vacuum is pulled on the filter cake through the filtrate drain lines. Under reduced pressure moisture or other volatile materials will ~aporize out of the cake. The heat of vaporization is supplied by the heat trans$er from the hot fluid through the shell. The vacuum allows drying and heat transfer at a temperature compatible with the plastic materiale used in the part. The pressure to ~Yp~r~A the ~;~pl~ragm~ i~ suppliQd by the heating fluid.
As the $ilter cake driee it lo~ee volume and could loose contact with the plate shell thus stopping heat transfer.
The ~ap~agm operation of the plate allows the heat transfer ~urface to eY~n~ as the cake shrinks. This maintains good heat transfer through out the drying cycle.
The inventi~e process vacuum dries by tran~ferring heat to the filter cake to supply the heat of vaporization through the membrane or diaphragm part of the plate from the circulating hot water. Vacuum is supplied to the filter cake side of the press plate through the filtrate drain lines to lower the boiling point of the liquids in the cake ~o that there will be enough of a temperature differential between the hot water in the diaphragm area and the cake to get sufficient heat transfer for drying.
Each plate i8 ported with molded in fittings to allow the hot water to be circulated through the inside of the plate. The internal flow path i8 between the core of the plate and the ~i~p~ragm. The circulation rate is sufficiently high to create turbulence for uniform heating. An external water tank is heated and pumped to a manifold along the bottom of the press. This manifold is hosed to each plate to ~upply hot water. The top of each ~ plate i6 ho~ed to a return manifold that returns the hot water to the tank. Back pres~ure iB maint:-;neA on the return manifold to inflate the diaphragms and maintain contact with the cake.
After cake i~ made and filtrate is no longer exiting the press, the drain lines are connected to the ~acuum source. For example, ~acuum can be supplied by a ~rB
CA 0222~084 1997-12-18 W O 97/00171 PCTrUS96/11470 liguid eductor, wherein water is circulated through a liquid eductor that pulls a vacuum on the filter prees.
Vaporized liquids can be con~n~ed by direct contact in the eductor, or in an ~Ych~nger prior to the eductor.
~acuum is maint~; ne~ by cooling the circulating water etream. Vacuum can be supplied through any one of many meane.
Hot water can be manifolded ae above, or can be ~upplied through internal plate porting ae are feed and drain lines. Vacuum can be eupplied by any means. The heating medium could be any fluid. Other core and diaphragm materials could be utilized that could withstand live steam or some other hot fluid.
Wa~te~ can be dried beyond what can normally achieved with sta~rd dewattering devices. Liquids in the void spacee between ~olid particles in the cake can be removed through vaporization, thus reducing the weight and volume of the waste to be di~posed of. In some case6 other contaminates can be removed with the primary liquid stream that will help in the disposal options. An example of thi~ is the benzene in A.P.I. wastes that limit land fill options. The low level benzene will azeatroph with the water in the drying process.
Products that need to be supplied in a dry form for sale or for further procee~ing can be dried in the filter preee. This would include things like pigments, metals and metal salts, foods and pharmaceuticals.
~ecauee the drying ie done under vacuum temperature degradation will not occur.
Sewer sludge dispoeal i~ limited by the level of pathogens and by the level of moisture in it. St~n~rd dewatering method~ cannot meet either requirement with out further treatment. The inventive proces~ can meet 503 regulations for pathogen kill and solids content. The pathogen kill ie accompllehed by heating the cake with the circulating hot water in the ~;~rhragms without the vacuum. The cake could also be heated by introducing a hot fluid into the cake area. After the temperature and CA 0222~084 1997-12-18 WO97/00171 PCT~S96/11470 time reguirement~ are met, the vacuum is turned on and the cake iB dried to meet the percent solid~ requirementE~.
The inventive process can also be used if the sludge is being incineratod, becauRe enough water i~ removed to make the sludge a po~itive heat value.
In an alternate embodiment, in~tead of the hot fluid circulation and Reparate ~acuum eystem to dry the filter cake, a vapor recompression internal heat pump system could be u~ed. After cake is made in the press, a ~racuum pump/compressor i8 used to pull a ~racuum on the cake side of the press. The~e vapors are recompressed to a pressure high enough to inflate the ~;ap~agm~ of the plate~ and are introduced to the core area of the plate to supply the heat of vaporization to ~aporize more liquid from the cake. In order not to exceed the temperature limitation~ of the plate, a non-con~enQahle gas is introduced in the recompre_sed gas stream to lower the dew point of con~nRing temperature of the ~tream.
~R~-RO~ND OF THE lNV~N LlON
DESCRIPTION
TECHNICAL FIELD
ThiR in~ention relates generally to filter pres_ plates, and more Rpeclfically to an impro~ed vacuum drying ~;aph~agm-type filter press plate.
R~ ROUND ART
There are many manufacturers of recessed filter plates and ~;arhragm filter plates on the market.
StAn~rd diap_ragm plate~ are m_nufactured by placing an ela_tomer co~er o~er a solid pla~tic core. The _olid pla~tic core contain_ the indi~idual drain channels and the corner drain piping. The elastomer covers the filtration area of the plate and i8 inflated with a fluid introduced through a pipe fitting in t_e core of the plate. The advantagee of a ~;~rhTagm plate are: shortened cycle timeR, better cake w~h;ng, and the ability of the press to take vari_ble feed 10A~;ng.
Disad~antages of current ~iArhTagm plates are many. The main reason ~;Aphragm plates are not used exclu~ively in the filter press market iB cost. The current method of mPn~fActure i~ very expen~i~e and requires a large capital cost for equipment. A diaphragm plate will usually cost four timee that of a stan~ard recessed plate. In addition to the initlal cost the two piece construction (elastomer ~;Arhragm and ~olid plate body) will have higher failure rate due to ~eparation of the pieces. Failure of the elastomer ~;ap~Tagm itself can alRo occur.
At lea_t one manufacturer of diaphragm plates ha~ suggested that a hot or cold liquid can be pumped into the core area. Thi~ is prim_rily used to preheat or precool the plate and diaphragm to stay within the material temperature limitations of the part, and not to actually transfer heat to or from the material being filtered.
CA 0222~084 1997-12-18 WO 97100171 PCTrUS96/11470 A non~ phragm teflon plate with steam coils in the plate has also been proposed. Thi~ was to heat and dry the cake solids after the filtration cycle was complete. This approach is problematic because after any initial drying the fllter cake loses volume and creates a gap between the cake and the filter press plate. This gap insulates the cake, and heat transfer and drying are limited only to applications where the cake remains in contact with the hot plate surface. Another manufacturer has tried to rotationally mold an outer shell and foam fill the inner section. HO.I_VeL, it is difficult to manufacture a continuous outer shell out of crosslink polyethylene, and incorporate drain ports from the filter area to the drain link6.
DISC~OSURE OF lNV .llON
The filter press plate of this invention can be distinguished from any other commercial filter plate in physical differ-nces and in functional differences. As oppo~ed to a stan~d diaphragm plate that has an exposed core with an ela~tomer ~;ap~agm covering the filtration area, the inventive plate is rotationally molded in one sealed hollow piece. The shell is placed in a second mold and urethane foamed under pressure. This results in a solid core inside the shell that can ~upport the pressures from the press closure and the filtration pressures.
Because no other plate is rotationally molded, no other plate is made from cross linked polyethylene.
The crosslinked other shell allows the plate to handle much higher temperatures than the propylene plastic plates currently available.
The inventive plate also has multiple pipe fittings molded into the shell. The pipe fittings allow the hot or cold fluid to be pumped into the core area to heat the shell.
The filter press plate functions like no other available plate. This is primarily due to its one piece cross link polyethylene shell and urethane core. As a CA 0222~084 1997-12-18 conventional ~;aph~agm plate, the one piece outer shell cannot separate in the f~ltration area because there is no joint or connection point. The cross linked polyethylene i~ not an ela~tomer and i~ much tougher and allows higher filtration temperatures.
Because the shell iR a thin sealed crosslinked piece, this allows heat tran~fer from any fluid pumped into the core to the filter cake. The heating fluid inflates the diaphragm and maintains contact with the cake as the cake loses ~olume during the drying process under vacuum.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 ie a perspective view of a complete rotomolded filter press plate of thi~ invention, without cloths.
Fig. 2 is a cutaway perspective view of a filter press plate of this invention.
Fig. 3 is a side elevation cross-sectional view of a filter press plate of this invention, showing the foamed core and outer shell.
Fig. 4 is an elevation view of a pipe fitting molded into the crosslinked shell, used to introduce or remove fluids form the core area.
BEST MODE FOR CARRYING O~T THE lNv~r.~lON
Fig. 1 i6 a perspective view of a complete rotomolded filter press plate 10 of this invention, without cloths. Filtration area 12 of the plate i6 ribbed to allow filtrate to flow to the four corner drain ports.
This i8 also the area that delaminate~ from the core when core pressure is applied and diaphragms out. Heat transfer to the cake occur~ in this area. Drain porting 14 allow~ filtrate to leave each plate and flow to the fixed end of the pre~s to exit. Sludge is pumped to each plate cavity through feed port 16, and is cont~;ne~ by sealing edge 18 of the plate. Molded in pipe fittings 20 allow fluids to be introduced or removed from the plate CA 0222S084 l997-l2-l8 W O 97/00171 PCTrUS96/11470 core (bottom connections not shown). Molded in drain pa~sages 22 allow filtrate to get to the drain ports.
Fig. 2 is a cutaway perspective view of a filter press plate 10 of this invention, illustrating the solid foam core 24 of the plate, drain passages 22, and molded in pipe fittings 20.
~ ig. 3 is a side elevation cross-sectional view of filter press plate 10 of this invention, showing the foam core 24 and outer shell 26.
Fig. 4 is an elevation view of a pipe fitting 20 molded into the crosslinked shell 26, used to introduce or remove fluids form the core area.
The invention provides a one piece outer shell, ~l~phragm recessed filter press plate. The outer shell i6 rotationally molded out of cross linked polyethylene. The inner cavity is filled with a structural polyurethane foam. The outer shell and the inner core foam delaminate 80 that in the filtration area the shell can be expanded out by pressurizing the inner core with a fluid. This eYr~nA;ng of the outer shell makes the plate a diaphragm filter press plate. Conventional diaphragm plates utilize an elastomer diaphragm fitted to a solid plastic core.
This design is not one piece and fail6 when the diaphragm separates from the core.
In the rotomolding of the ehell, internal drain passages are molded into the shell with pin inserts that are removed prior to opening the mold. Thi6 leaves molded in drain pipes that do not compromise the sealed shell of the part.
This invention provides the ability to pump hot or cold fluids into the core area of the plate. Metal pipe inserts are molded into the outer edge of the one piece shell during the manufacturing proce~s. Fluids pumped into the ~ealed core area heat or cool the shell of the plate. This in turn heat6 or c0016 the filter cake held inside each plate cavity. In the case of heating, hot fluid is pumped through the shell under pressure.
While the filter press is still in the closed position, a .
CA 0222~084 1997-12-18 vacuum is pulled on the filter cake through the filtrate drain lines. Under reduced pressure moisture or other volatile materials will ~aporize out of the cake. The heat of vaporization is supplied by the heat trans$er from the hot fluid through the shell. The vacuum allows drying and heat transfer at a temperature compatible with the plastic materiale used in the part. The pressure to ~Yp~r~A the ~;~pl~ragm~ i~ suppliQd by the heating fluid.
As the $ilter cake driee it lo~ee volume and could loose contact with the plate shell thus stopping heat transfer.
The ~ap~agm operation of the plate allows the heat transfer ~urface to eY~n~ as the cake shrinks. This maintains good heat transfer through out the drying cycle.
The inventi~e process vacuum dries by tran~ferring heat to the filter cake to supply the heat of vaporization through the membrane or diaphragm part of the plate from the circulating hot water. Vacuum is supplied to the filter cake side of the press plate through the filtrate drain lines to lower the boiling point of the liquids in the cake ~o that there will be enough of a temperature differential between the hot water in the diaphragm area and the cake to get sufficient heat transfer for drying.
Each plate i8 ported with molded in fittings to allow the hot water to be circulated through the inside of the plate. The internal flow path i8 between the core of the plate and the ~i~p~ragm. The circulation rate is sufficiently high to create turbulence for uniform heating. An external water tank is heated and pumped to a manifold along the bottom of the press. This manifold is hosed to each plate to ~upply hot water. The top of each ~ plate i6 ho~ed to a return manifold that returns the hot water to the tank. Back pres~ure iB maint:-;neA on the return manifold to inflate the diaphragms and maintain contact with the cake.
After cake i~ made and filtrate is no longer exiting the press, the drain lines are connected to the ~acuum source. For example, ~acuum can be supplied by a ~rB
CA 0222~084 1997-12-18 W O 97/00171 PCTrUS96/11470 liguid eductor, wherein water is circulated through a liquid eductor that pulls a vacuum on the filter prees.
Vaporized liquids can be con~n~ed by direct contact in the eductor, or in an ~Ych~nger prior to the eductor.
~acuum is maint~; ne~ by cooling the circulating water etream. Vacuum can be supplied through any one of many meane.
Hot water can be manifolded ae above, or can be ~upplied through internal plate porting ae are feed and drain lines. Vacuum can be eupplied by any means. The heating medium could be any fluid. Other core and diaphragm materials could be utilized that could withstand live steam or some other hot fluid.
Wa~te~ can be dried beyond what can normally achieved with sta~rd dewattering devices. Liquids in the void spacee between ~olid particles in the cake can be removed through vaporization, thus reducing the weight and volume of the waste to be di~posed of. In some case6 other contaminates can be removed with the primary liquid stream that will help in the disposal options. An example of thi~ is the benzene in A.P.I. wastes that limit land fill options. The low level benzene will azeatroph with the water in the drying process.
Products that need to be supplied in a dry form for sale or for further procee~ing can be dried in the filter preee. This would include things like pigments, metals and metal salts, foods and pharmaceuticals.
~ecauee the drying ie done under vacuum temperature degradation will not occur.
Sewer sludge dispoeal i~ limited by the level of pathogens and by the level of moisture in it. St~n~rd dewatering method~ cannot meet either requirement with out further treatment. The inventive proces~ can meet 503 regulations for pathogen kill and solids content. The pathogen kill ie accompllehed by heating the cake with the circulating hot water in the ~;~rhragms without the vacuum. The cake could also be heated by introducing a hot fluid into the cake area. After the temperature and CA 0222~084 1997-12-18 WO97/00171 PCT~S96/11470 time reguirement~ are met, the vacuum is turned on and the cake iB dried to meet the percent solid~ requirementE~.
The inventive process can also be used if the sludge is being incineratod, becauRe enough water i~ removed to make the sludge a po~itive heat value.
In an alternate embodiment, in~tead of the hot fluid circulation and Reparate ~acuum eystem to dry the filter cake, a vapor recompression internal heat pump system could be u~ed. After cake is made in the press, a ~racuum pump/compressor i8 used to pull a ~racuum on the cake side of the press. The~e vapors are recompressed to a pressure high enough to inflate the ~;ap~agm~ of the plate~ and are introduced to the core area of the plate to supply the heat of vaporization to ~aporize more liquid from the cake. In order not to exceed the temperature limitation~ of the plate, a non-con~enQahle gas is introduced in the recompre_sed gas stream to lower the dew point of con~nRing temperature of the ~tream.
Claims (2)
1. A filter press plate comprising:
one piece outer shell, diaphragm recessed filter press plate, said outer shell rotationally molded out of cross linked polyethylene, providing an inner cavity filled with a structural polyurethane foam core, wherein said outer shell said inner core are adpated to delaminate so that in the filtration area the shell can be expanded out by pressurizing the inner core with a fluid.
one piece outer shell, diaphragm recessed filter press plate, said outer shell rotationally molded out of cross linked polyethylene, providing an inner cavity filled with a structural polyurethane foam core, wherein said outer shell said inner core are adpated to delaminate so that in the filtration area the shell can be expanded out by pressurizing the inner core with a fluid.
2. The filter press plate of claim 1 including internal drain passages molded into the shell with pin inserts that are removed prior to opening the mold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US31595P | 1995-06-19 | 1995-06-19 | |
| US60/000,315 | 1995-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2225084A1 true CA2225084A1 (en) | 1997-01-03 |
Family
ID=21690946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002225084A Abandoned CA2225084A1 (en) | 1995-06-19 | 1996-06-19 | Vacuum drying diaphragm filter press plates |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0869868A4 (en) |
| JP (1) | JPH11509772A (en) |
| AU (1) | AU6486696A (en) |
| CA (1) | CA2225084A1 (en) |
| MX (1) | MX9800542A (en) |
| WO (1) | WO1997000171A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6180002B1 (en) | 1998-08-03 | 2001-01-30 | United States Filter Corporation | Filter press with alternating diaphragm squeeze chamber plates and filtration chamber plates |
| KR100386552B1 (en) * | 2000-08-03 | 2003-06-02 | 한국화인케미칼주식회사 | Polymeric chiral salen derivatives useful for asymmetric epoxidation of olefins |
| KR100364482B1 (en) * | 2000-08-08 | 2002-12-12 | 주식회사 에코셋 | Membrane plate for filter press |
| US7125432B2 (en) | 2004-07-23 | 2006-10-24 | J.M. Huber Corporation | Method for making precipitated silica or silicate compositions and products thereof |
| WO2012177521A1 (en) * | 2011-06-20 | 2012-12-27 | Simpson Daniel J | Bitumen extraction and dewatering in a filter press |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5416781A (en) * | 1977-07-07 | 1979-02-07 | Kurita Mach Mfg Co Ltd | Pess filter plate of filter press |
| DE3637977A1 (en) * | 1986-11-07 | 1988-08-04 | Lenser Kunststoff Press | METHOD FOR CONNECTING PLASTIC AREAS |
| DE3701862A1 (en) * | 1987-01-23 | 1988-08-04 | Lenser Kunststoff Press | FILTER PLATE MADE OF THERMOPLASTIC PLASTIC FOR A FILTER PRESS |
| DE3843250A1 (en) * | 1988-12-22 | 1990-07-05 | Jv Kunststoffwerk | FINISHED MOLDED PART |
| GB9125597D0 (en) * | 1991-12-02 | 1992-01-29 | Ici Plc | Process for production of a component part of a filter-press type structure |
-
1996
- 1996-06-19 CA CA002225084A patent/CA2225084A1/en not_active Abandoned
- 1996-06-19 JP JP9503422A patent/JPH11509772A/en not_active Ceased
- 1996-06-19 WO PCT/US1996/011470 patent/WO1997000171A1/en not_active Application Discontinuation
- 1996-06-19 EP EP96924401A patent/EP0869868A4/en not_active Withdrawn
- 1996-06-19 AU AU64866/96A patent/AU6486696A/en not_active Abandoned
-
1998
- 1998-01-19 MX MX9800542A patent/MX9800542A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| MX9800542A (en) | 1998-11-29 |
| AU6486696A (en) | 1997-01-15 |
| EP0869868A4 (en) | 1999-08-25 |
| WO1997000171A1 (en) | 1997-01-03 |
| JPH11509772A (en) | 1999-08-31 |
| EP0869868A1 (en) | 1998-10-14 |
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| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |