US4414111A
Expired / Lapsed
US
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Shaped composite adsorbent and a process for preparing the same
Assignee: Asahi Kasei Corp
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Filing: 1981-12-15
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Granted: 1983-11-08
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Expires: 2001-12-15
Abstract
Abstract A shaped composite adsorbent made of a shaped porous material of a skin-core structure comprising a powdery ion-exchange type adsorbent and an ionic group-containing acrylonitrile polymer and wherein said shaped porous material has a semi-permeable skin layer of 0.01 to 1μ in thickness and a void volume rate of 50 to 90%, which is capable of adsorbing solutes present at low concentration with high selectivity and high yield. The shaped composite adsorbent of the present invention can be obtained by a process comprising dissolving an ionic group-containing acrylonitrile polymer in and dispersing a powdery ion exchange type adsorbent in an inorganic solvent for said acrylonitrile polymer, extruding the resultant into a coagulating liquid bath to effect coagulation-shaping thereof. The adsorption capacity and mechanical strength of the shaped composite adsorbent of the present invention can be further improved by subjecting the above-obtained coagulation-shaped material to heat treatment in a wet state, without drying.
Inventors
- 👤 Toshiyuki Iwaisako
- 👤 Akio Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/30; B01J20/32; B01J20/3231; B01J20/3242; B01J20/3244; B01J20/3265; B01J20/3202; B01J20/3206; B01J20/3208; B01J20/321; B01J20/3234; B01J20/3236; B01J20/3238; B01J47/00; B01J47/018; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/268
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
60 words
A shaped composite adsorbent made of a shaped porous material of a skin-core structure comprising a powdery ion-exchange type adsorbent and an acrylonitrile polymer containing 0.1 to 20% by weight of an ionic group and wherein said shaped porous material has a semi-permeable skin layer of 0.01 to 1μ in thickness and a void volume rate of 50 to 90%.
Claim 2
Dependent Claim
60 words
A shaped composite adsorbent made of a shaped porous material of a skin-core structure comprising a powdery ion-exchange type adsorbent and an acrylonitrile polymer containing 0.1 to 20% by weight of an ionic group and wherein said shaped porous material has a semi-permeable skin layer of 0.01 to 1μ in thickness and a void volume rate of 50 to 90%.
Claim 3
Dependent Claim
37 words
A shaped composite adsorbent according to claim 1, wherein said powdery ion-exchange type adsorbent is at least one member selected from the group consisting of a zeolite, titanic acid, zirconium phosphate, zirconic acid and a chelate resin.
Claim 4
Dependent Claim
39 words
A shaped composite adsorbent according to claim 1, wherein said ionic group is at least one member selected from the group consisting of a carboxylic acid group, a sulfonic acid group, a phosphonic acid group and an ammonium group.
Claim 5
Dependent Claim
27 words
A shaped composite adsorbent according to claim 1, wherein the surface of said skin layer exhibits a pumiceus appearance when observed by means of an optical microscope.
Claim 6
Dependent Claim
17 words
A shaped composite adsorbent according to claim 1, wherein the void volume rate is 60 to 80%.
Claim 7
Dependent Claim
131 words
A process of preparing a shaped composite adsorbent made of a shaped porous material of a skin-core structure comprising a powdery ion-exchange type adsorbent and an acrylonitrile polymer containing 0.1 to 20% by weight of an ionic group and wherein said shaped porous material has a semipermeable skin layer of 0.01 to 1μ in thickness and a void volume rate of 50 to 90%, which comprises dissolving an ionic group-containing acrylonitrile polymer in and dispersing a powdery ion-exchange type adsorbent in an inorganic solvent for said acrylonitrile polymer, said acrylonitrile polymer and said powdery ion-exchange type adsorbent being employed in a weight ratio of 1/0.5 to 1/10, extruding the resultant into an inorganic coagulating liquid bath to effect coagulation-shaping thereof, followed by removal of said solvent from the resulting shaped material.
Claim 8
Dependent Claim
131 words
A process of preparing a shaped composite adsorbent made of a shaped porous material of a skin-core structure comprising a powdery ion-exchange type adsorbent and an acrylonitrile polymer containing 0.1 to 20% by weight of an ionic group and wherein said shaped porous material has a semipermeable skin layer of 0.01 to 1μ in thickness and a void volume rate of 50 to 90%, which comprises dissolving an ionic group-containing acrylonitrile polymer in and dispersing a powdery ion-exchange type adsorbent in an inorganic solvent for said acrylonitrile polymer, said acrylonitrile polymer and said powdery ion-exchange type adsorbent being employed in a weight ratio of 1/0.5 to 1/10, extruding the resultant into an inorganic coagulating liquid bath to effect coagulation-shaping thereof, followed by removal of said solvent from the resulting shaped material.
Claim 9
Dependent Claim
22 words
A process according to claim 6, wherein said solvent is nitric acid and said coagulating liquid is an aqueous nitric acid solution.
Claim 10
Dependent Claim
29 words
A process according to claim 7, wherein said coagulating liquid is an aqueous 30 to 45 weight % nitric acid solution having a temperature of 5° to 30° C.
Claim 11
Dependent Claim
29 words
A process according to claim 6, wherein said resulting shaped material obtained by the removal of the solvent is subjected to heat treatment in a wet state, without drying.
Claim 12
Dependent Claim
21 words
A process according to claim 9, wherein said heat treatment in a wet state is effected by means of hot water.
Claim 13
Dependent Claim
18 words
A process according to claim 10, wherein the hot water has a temperature of 70° C. or more.
References Cited (Backward Citations)
US4265959A
Cited
US4360434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |