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Patent US5021391A successfully refreshed from Google Patents.
US5021391A
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US
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Carbonaceous adsorbent for removal of pyrogen and method of producing pure water using same
Assignee: Tokyo Organic Chemical Industries Inc
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Filing: 1989-09-01
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Granted: 1991-06-04
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Expires: 2009-09-01
Abstract
Abstract A carbonaceous adsorbent to be used for the removal of a pyrogen dissolved in water is disclosed. The adsorbent is obtained by carbonizing porous beads of a cross-linked polymer. This adsorbent is favorably used for the removal of endotoxin in the production of pure water from deionized water resulting from the treatment with ion-exchange resins.
Inventors
- 👤 Wataru Agui
- 👤 Shuji Tamura
- 👤 Hiroshi Kuyama
- 👤 Yoshiya Kurachi
- 👤 Masahiko Abe
- 👤 Yukihiro Kaneko
- 👤 Keizo Ogino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:49
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; C; C02; C02F; C02F1/00; C02F1/28; C02F1/283; C02F2103/00; C02F2103/02; C02F2103/04; Y; Y10; Y10S; Y10S210/00; Y10S210/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension polymerizing divinylbenzene and styrene in the presence of an additive of butanol or toluene; subjecting the resulting porous cross-linked copolymer beads to sulfonation; infusibilizing the thus-treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads by steam, thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
Claim 2
Dependent Claim
96 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension polymerizing divinylbenzene and styrene in the presence of an additive of butanol or toluene; subjecting the resulting porous cross-linked copolymer beads to sulfonation; infusibilizing the thus-treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads by steam, thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
Claim 3
Dependent Claim
19 words
An adsorbent as claimed in claim 1 wherein the sulfonation and infusibilization are simultaneously conducted with fuming sulfuric acid.
Claim 4
Dependent Claim
100 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension-polymerizing divinyl benzene and styrene in the presence of an additive of butanol or toluene; subjecting the resulting porous cross-linked copolymer beads to sulfonation; infusibilizing the thus treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads with aqueous ZnCl 2 , thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
Claim 5
Dependent Claim
100 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension-polymerizing divinyl benzene and styrene in the presence of an additive of butanol or toluene; subjecting the resulting porous cross-linked copolymer beads to sulfonation; infusibilizing the thus treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads with aqueous ZnCl 2 , thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
Claim 6
Dependent Claim
19 words
An adsorbent as claimed in claim 3, wherein the sulfonation and infusibilization are simultaneously conducted with fuming sulfuric acid.
Claim 7
Dependent Claim
99 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension-polymerizing divinyl benzene and styrene in the presence of an additive of butanol or toluene; subjecting the resuling porous cross-linked copolymer beads to chloromethylation followed by amination; infusibilizing the thus-treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads by steam, thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
Claim 8
Dependent Claim
99 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension-polymerizing divinyl benzene and styrene in the presence of an additive of butanol or toluene; subjecting the resuling porous cross-linked copolymer beads to chloromethylation followed by amination; infusibilizing the thus-treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads by steam, thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
Claim 9
Dependent Claim
102 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension-polymerizing divinyl benzene and stryene in the presence of an additive of butanol or toluene; subjecting the resulting porous cross-linked copolymer beads to chloromethylation followed by amination; infusibilization the thus-treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads with aqueous ZnCl 2 , thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
Claim 10
Dependent Claim
102 words
A carbonaceous adsorbent for the removal of pyrogens dissolved in pure water, which adsorbent is produced by suspension-polymerizing divinyl benzene and stryene in the presence of an additive of butanol or toluene; subjecting the resulting porous cross-linked copolymer beads to chloromethylation followed by amination; infusibilization the thus-treated copolymer beads; carbonizing the infusibilized copolymer beads; and activating the carbonized beads with aqueous ZnCl 2 , thereby producing an adsorbent which retains the skeletal structure of the copolymer beads intact and which is capable of reducing the pyrogenic content of water containing the same to at least the pyrogen detection limit of 0.01 ng/ml.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-03 | 1994-12-03 | 1995-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-03 | 1998-12-03 | 1999-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-03 | 2002-12-03 | 2003-06-04 | $7700.00 | Window Closed / Lapsed |