# US 8,465,648 B2 · Ceramic pervaporation membrane and ceramic vapor-permeable membrane

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- Number: US 8,465,648 B2
- Document ID: US8465648B2
- Status: Granted
- Kind: B2
- Application number: 13/289,223
- Filed: 2011-11-04
- Published: 2012-03-29
- Granted: 2013-06-18
- Earliest claimed: 2009-05-18
- Assignees: NGK Insulators, Ltd.
- Applicants: Makoto Teranishi; Hideyuki Suzuki; Satoshi Sakashita; Manabu Isomura
- Inventors: Makoto Teranishi; Hideyuki Suzuki; Satoshi Sakashita; Manabu Isomura
- Web page: https://patentgrep.com/patent/US8465648B2

## CPC

- B01D 63/066: {with a porous block having membrane coated passages}
- B01D 61/362: {Pervaporation}
- B01D 61/363: {Vapour permeation}
- B01D 67/0046: {by slurry techniques, e.g. die or slip-casting}
- B01D 67/0095: {Drying}
- B01D 69/108: {Inorganic support material}
- B01D 69/1216: {Three or more layers}
- B01D 2313/12: Specific discharge elements
- B01D 2325/0233: with clearly distinguishable layers
- B01D 2325/0283: Pore size
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)

## Abstract

A ceramic pervaporation membrane and a ceramic vapor-permeable membrane where the total aperture length of discharge channels parallel to the channel direction of water collection cells is at least 10% of the length of filtration cells and where the ratio m/n of the number m of rows of filtration cells to the number n of rows of water collection cells is between 1 and 4 have a high water permeation rate and a high separation coefficient.

## Claims

### Claim 1

A ceramic filter comprising a porous body and a separation membrane that separates a mixed fluid containing water and an organic solvent into a permeated separation water vapor,
wherein the porous body has opposed end faces and an outer peripheral face, plural filtration cells extending from one end face to the other end face and forming rows, and plural water vapor collection cells extending from one end face to the other end face and forming rows, the water vapor collection cells being plugged in both the end faces, and discharge channels provided so that the water vapor collection cells communicate with an external space, wherein a ratio m/n of the number m of the rows of filtration cells to the number n of the rows of water vapor collection cells is between 1 and 4,
the separation membrane is disposed on inner wall faces of the filtration cells of the porous body,
a total aperture length of the discharge channels parallel to the channel direction of the water vapor collection cells is at least 10% of the length of the filtration cells, and
the permeation rate per membrane area of the ceramic filter is greater than 1.8 kg/m2h.

### Claim 2 (depends on 1)

The ceramic filter according to claim 1, wherein the total aperture length of the discharge channels parallel to the channel direction of the water vapor collection cells is at least 20% of the length of the filtration cells.

### Claim 3 (depends on 1)

The ceramic filter according to claim 1, wherein the plural discharge channels are formed, and
the longest interval between discharge channels adjacent to each other in the channel direction of the water vapor collection cells is no more than 45% of the length of the filtration cells.

### Claim 4 (depends on 1)

The ceramic filter according to claim 1, wherein the number of the rows of filtration cells between two rows of water vapor collection cells is at most 3.

### Claim 5 (depends on 1)

The ceramic filter according to claim 1, wherein the number of the rows of filtration cells between two rows of water collection cells is 2 and wherein the filtration cells are constantly adjacent to the water vapor collection cells.

### Claim 6 (depends on 1)

The ceramic filter according to claim 1, wherein the length of the filtration cells is 300 mm or more and 1500 mm or less.

### Claim 7 (depends on 1)

The ceramic filter according to claim 1, wherein the cross-sectional shape of the filtration cells is circular.

### Claim 8 (depends on 1)

A dehydration method for removing moisture as vapor from an aqueous solution, a mixed gas of water and an organic solvent or a water and an organic solvent multiphase solution by using a ceramic filter according to claim 1.