1. Platform (150) for a bladed wheel of a turbomachine comprising a drum (130) and blades (120) of hammer-head attachment type, the foot (122) of which is retained in a circumferential groove (131) of the drum (130), wherein said platform has bearing andor retaining faces capable of cooperating with the drum (130) to retain the platform (150) on the drum (130), in that it covers an angular segment, and wherein said platform comprises at least two openings (151) spaced apart circumferentially and each able to receive the foot (122) of a blade (120), whereby it constitutes a multiple-blade platform in the form of a piece separate from the blades (120).
2. Platform (150) according to claim 1, wherein said platform also comprises, in the position of each opening (151), a recess (152) opening out onto the external face making it possible to receive a reduced blade platform (123).
3. Platform (150) according to claim 1, wherein said platform also comprises two stiffeners (153) comprising lateral bearing faces (153a) able, on their own, to axially retain the platform (150) on the drum (130) and to reduce air recirculations.
4. Platform (150) according to claim 1, wherein said platform also comprises, at each of its two circumferential ends, an inter-platform bearing face (154) able to bear, after fitting on the drum (130), against an inter-platform bearing face (154) of the adjacent platform (150).
5. Platform (150) according to claim 1, wherein said platform also comprises, either side of each opening (151), in the axial direction, two orifices (155) each enabling the passage of a blade catch (125).
6. Platform (150) according to claim 1, wherein said platform comprises four openings (151) spaced apart circumferentially and each able to receive a blade (120).
7. Platform (150) according to claim 1, wherein said platform is made of a light metal alloy or of a composite material comprising a thermoplastic matrix and fibres.
8. Blade (120) designed to be fitted on a drum by means of a platform according to claim 1, wherein said blade is made in a single piece and comprises a vane (121) and a foot (122), between which is formed a reduced platform (123) wherein the bottom face of the reduced platform (123) has two blade catches (125) arranged axially either side of the foot (122) and oriented towards the foot (122).
9. Moving bladed wheel comprising blades (120) of hammer-head attachment type and a drum (130) comprising a circumferential groove (131) able to retain the foot (122) of the blades (120) and having an insertion notch (133), wherein said bladed wheel comprises several platforms (150) according to claim 1, each covering an angular segment of the bladed wheel and retaining several blades (120) in the drum (130).
10. Compressor comprising at least one bladed wheel according to claim 9.
11. Turbomachine comprising at least one bladed wheel according to claim 10.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A mixed matrix membrane comprising at least two types of molecular sieves having, independently, a largest minor crystallographic free diameter of 3.8 angstroms or less dispersed in a continuous polymer matrix wherein said at least two types of molecular sieves are selected to produce a mixed matrix membrane having improved CO2CH4 selectivity and CO2 permeability wherein a first type of molecular sieve is AlPO-14 and a second type of molecular sieve has a largest minor crystallographic free diameter of its pores of 3.8 angstroms or less.
2. The mixed matrix membrane of claim 1 wherein said second type of molecular sieves is selected from the group consisting of pure silicate molecular sieves, alumino-phosphate molecular sieves; aluminosilicate molecular sieves and silico-alumino-phosphate molecular sieves.
3. The mixed matrix membrane of claim 2 wherein said pure silicate molecular sieve is Si-DDR, said alumino-phosphate molecular sieves are selected from the group consisting of AlPO-18, AlPO-34, AlPO-53, and AlPO-17, said aluminosilicate molecular sieves are selected from the group consisting of 4A, SSZ-13, SSZ-62, UZM-5, UZM-25, and UZM-9, and said silico-alumino-phosphate molecular sieve is SAPO-34.
4. The mixed matrix membrane of claim 1 wherein said continuous polymer matrix comprises one or more rigid, glassy polymers.
5. The mixed matrix membrane of claim 4 wherein said rigid glassy polymers are selected from the group consisting of polysulfones; sulfonated polysulfones; polyethersulfones; sulfonated polyethersulfones; cellulosic polymers including cellulose acetate and cellulose triacetate; polyamides; polyimides; polyamideimides; polyketones; polyether ketones; polyether ether ketones; poly(arylene oxide)s; poly(esteramide-diisocyanate)s; polyurethanes; polyesters; polybenzobenzimidazoles; polybenzimidazoles; polybenzoxozoles; polycarbodiimides; polyphosphazines; microporous polymers wherein said microporous polymers have rigid rod-like, randomly contorted structures; and blends thereof.
6. The mixed matrix membrane of claim 2 wherein said AlPO-14 and said second type of molecular sieve are present at a ratio by weight of from 1:2 to 2:1.
7. The mixed matrix membrane of claim 1 wherein said mixed matrix membrane is a mixed matrix dense film, a flat sheet asymmetric mixed matrix membrane, a thin film composite mixed matrix membrane or a hollow fiber asymmetric mixed matrix membrane.
8. A method of making a mixed matrix membrane comprising dispersing AlPO-14 and a second type of molecular sieve particles in one or more solvents to form a slurry, dissolving a polymer as a continuous polymer matrix in said slurry to form a concentrated suspension, and then fabricating a mixed matrix membrane from said concentrated suspension wherein said second type of molecular sieves are selected, from the group consisting of SAPO-34, Si-DDR, UZM-9, AlPO-14, AlPO-53, AlPO-34, AlPO-17, SSZ-62, SSZ-13, AlPO-18, UZM-5, UZM-25, ERS-12, CDS-1, MCM-65, ZSM-52, and MCM-47, 4A, to produce a mixed matrix membrane having improved CO2CH4 selectivity and CO2 permeability.
9. The method of claim 8 further comprising dissolving a second polymer into said slurry.
10. The method of claim 8 further comprising coating a top surface of said mixed matrix membrane with a thin layer of a material to fill in any surface voids or defects.
11. The method of claim 10 wherein said thin layer of material is selected from the group consisting of a polysiloxane, a thermally curable silicone rubber, a fluoro-based polymer, or a radiation curable silicone.
12. The method of claim 8 wherein said AlPO-14 and said second type of molecular sieve are present at a ratio by weight of from 1:2 to 2:1.
13. The method of claim 8 wherein said continuous polymer matrix comprises one or more rigid, glassy polymers.
14. The method of claim 13 wherein said rigid glassy polymers are selected from the group consisting of polysulfones; sulfonated polysulfones; polyethersulfones; sulfonated polyethersulfones; cellulosic polymers including cellulose acetate and cellulose triacetate; polyamides; polyimides; polyamideimides; polyketones; polyether ketones; polyether ether ketones; poly(arylene oxide)s; poly(esteramide-diisocyanate)s; polyurethanes; polyesters; polybenzobenzimidazoles; polybenzimidazoles; polybenzoxazoles; polycarbodiimides; polyphosphazines; microporous polymers wherein said microporous polymers have rigid rod-like, randomly contorted structures; and blends thereof.
15. A process to separate at least one gas from a mixture of gases comprising providing a mixed matrix gas separation membrane comprising at least two types of molecular sieves comprising AlPO-14 and a second type of molecular sieve with a largest minor crystallographic free diameter of 3.8 angstroms or less dispersed in a continuous polymer matrix wherein said mixture of gases contacts one side of said mixed matrix gas separation membrane to cause at least one gas to permeate the mixed matrix gas separation membrane and then to remove said at least one gas which permeated the membrane while at least one other gas does not permeate the mixed matrix gas separation membrane.
16. The process of claim 15 wherein said second type of molecular sieves is selected, from the group consisting of pure silicate molecular sieves, alumino-phosphate molecular sieves; aluminosilicate molecular sieves and silico-alumino-phosphate molecular sieves.
17. The process of claim 15 wherein said mixture of gases is selected from pairs of gases comprising CO2CH4, H2CH4, O2N2, CO2N2, olefinparaffin, and isonormal paraffins.
18. The mixed matrix membrane of claim 1 wherein said second type of molecular sieves is selected, from the group consisting of SAPO-34, Si-DDR, UZM-9, AlPO-14, AlPO-53, AlPO-34, AlPO-17, SSZ-62, SSZ-13, ALPO-18, UZM-5, UZM-25, ERS-12, CDS-1, MCM-65, ZSM-52, and MCM-47, 4A.
19. The process of claim 15 wherein said mixture of gases comprises CO2 and CH4.