Patent US4496664A successfully refreshed from Google Patents.
US4496664A
Expired / Lapsed
US
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Oxine impregnated activated charcoal metal ion adsorbent
Assignee: Hitachi Ltd
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Filing: 1982-03-24
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Granted: 1985-01-29
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Expires: 2002-03-24
Abstract
Abstract A metal ion adsorbent free from release of oxine from activated charcoal even at a high temperature of more than 150° C. is prepared by adsorbing oxine or its derivative onto activated charcoal, adsorbing a phenol onto activated charcoal, dipping the resulting activated carbon into an aqueous solution of aldehyde such as formaldehyde, methylolizing oxine or its derivative in the presence of an acid or an alkali as a reaction promoter, and binding the methylolized oxine derivative, and the phenol by copolymerization or oxine can be methylolized in advance and then adsorbed onto the activated charcoal in place of adsorption of oxine onto the activated carbon, followed by methylolization of the oxine on the surface of the activated charcoal.
Inventors
- 👤 Kenji Motojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:17
CPC Classifications
B; B01; B01J; B01J45/00; B01J20/00; B01J20/02; B01J20/20; B01J20/28; B01J20/28002; B01J20/28004; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3242; B01J20/3268; B01J20/3276; B01J2220/00; B01J2220/40; B01J2220/48; B01J2220/4812; B01J2220/485; B01J2220/50; B01J2220/64; Y; Y10; Y10S; Y10S588/00; Y10S588/901
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
97 words
A process for preparing a metal ion adsorbent stable at temperatures up to about 300° comprising: providing activated charcoal; providing up to about 35 percent by weight based on the weight of the charcoal of an oxine having the following structure: ##STR3## or its derivative substituted at positions 2-7 of the structure; adsorbing the oxine or its derivative onto the activated charcoal; and heating the oxine or oxine derivative adsorbed activated charcoal at a temperature of 150° to 200° C., thereby binding the oxine or its derivative to pores of the activated charcoal through polymerization or condensation.
Claim 2
Dependent Claim
97 words
A process for preparing a metal ion adsorbent stable at temperatures up to about 300° comprising: providing activated charcoal; providing up to about 35 percent by weight based on the weight of the charcoal of an oxine having the following structure: ##STR3## or its derivative substituted at positions 2-7 of the structure; adsorbing the oxine or its derivative onto the activated charcoal; and heating the oxine or oxine derivative adsorbed activated charcoal at a temperature of 150° to 200° C., thereby binding the oxine or its derivative to pores of the activated charcoal through polymerization or condensation.
Claim 3
Dependent Claim
15 words
A process according to claim 1, wherein the heating is conducted for about three hours.
Claim 4
Dependent Claim
98 words
A process for preparing a metal ion adsorbent comprising: (a) adsorbing an oxine having the following structure: ##STR4## or its derivative substituted at positions 2-7 of the structure; onto activated charcoal; (b) dipping the material resulting from (a) into an aqueous aldehyde solution or or an aqueous solution of hexamethylenetetramine; (c) synthesizing methyloloxine from the material resulting from (b) on the activated charcoal in the presence of acid or alkali as a reaction promoter; and (d) heating the material resulting from (c) to bind it together and to the pores of the activated charcoal through polymerization or condensation.
Claim 5
Dependent Claim
98 words
A process for preparing a metal ion adsorbent comprising: (a) adsorbing an oxine having the following structure: ##STR4## or its derivative substituted at positions 2-7 of the structure; onto activated charcoal; (b) dipping the material resulting from (a) into an aqueous aldehyde solution or or an aqueous solution of hexamethylenetetramine; (c) synthesizing methyloloxine from the material resulting from (b) on the activated charcoal in the presence of acid or alkali as a reaction promoter; and (d) heating the material resulting from (c) to bind it together and to the pores of the activated charcoal through polymerization or condensation.
Claim 6
Dependent Claim
18 words
A process according to claim 3, wherein the heating is conducted for about three hours at 150° C.
Claim 7
Dependent Claim
17 words
A process according to claim 3, wherein the aldehyde selected from the group consisting formaldehyde or acetaldehyde.
Claim 8
Dependent Claim
15 words
A process according to claim 3, wherein a phenol is also adsorbed in step (b).
Claim 9
Dependent Claim
20 words
A process according to claim 6, wherein the heating is conducted for about three hours at 150° to 200° C.
Claim 10
Dependent Claim
18 words
A process according to claim 6, wherein the aldehyde selected from the group consisting of formaldehyde or acetaldehyde.
Claim 11
Dependent Claim
19 words
A process according to claim 6, wherein the phenol is selected from the group consisting of phenol and resorcinol.
Claim 12
Dependent Claim
92 words
A process for preparing a metal ion adsorbent comprising: (a) adding an aqueous aldehyde solution or an aqueous solution of hexamethylenetetramine to an oxine having the following structure: ##STR5## or its derivative substituted at positions 2-7 of the structure; (b) synthesizing methyloloxine from the material resulting from (a) in the presence of acid or alkali as a reaction promoter; (c) adsorbing the material resulting from (b) onto activated charcoal; and (d) heating the material resulting from (c) to bind it together on the surface of said activated charcoal by polymerization or condensation.
Claim 13
Dependent Claim
92 words
A process for preparing a metal ion adsorbent comprising: (a) adding an aqueous aldehyde solution or an aqueous solution of hexamethylenetetramine to an oxine having the following structure: ##STR5## or its derivative substituted at positions 2-7 of the structure; (b) synthesizing methyloloxine from the material resulting from (a) in the presence of acid or alkali as a reaction promoter; (c) adsorbing the material resulting from (b) onto activated charcoal; and (d) heating the material resulting from (c) to bind it together on the surface of said activated charcoal by polymerization or condensation.
Claim 14
Dependent Claim
18 words
A process according to claim 10, wherein the heating is conducted for about three hours at 150° C.
Claim 15
Dependent Claim
15 words
A process according to claim 10, wherein a phenol is also adsorbed in step (b).
Claim 16
Dependent Claim
18 words
A process according to claim 12, wherein the heating is conducted for about three hours at 150° C.
Claim 17
Dependent Claim
17 words
A process according to claim 12, wherein the aldehyde selected from the group consisting formaldehyde or acetaldehyde.
Claim 18
Dependent Claim
19 words
A process according to claim 12, wherein the phenol is selected from the group consisting of phenol and resorcinol.
Claim 19
Dependent Claim
53 words
A metal ion adsorbent stable at temperatures up to about 300° C. comprising activated charcoal and an oxine having the following structure: ##STR6## or its derivative substituted at positions 2-7 of the structure; polymerized or condensed in pores and on the surface of the activated charcoal by heating at 150° to 200° C.
Claim 20
Dependent Claim
53 words
A metal ion adsorbent stable at temperatures up to about 300° C. comprising activated charcoal and an oxine having the following structure: ##STR6## or its derivative substituted at positions 2-7 of the structure; polymerized or condensed in pores and on the surface of the activated charcoal by heating at 150° to 200° C.
Claim 21
Dependent Claim
54 words
A metal ion adsorbent stable at temperatures up to about 300° C. comprising activated charcoal and an oxine having the following structure: ##STR7## or its derivative substituted at positions 2-7 of the structure; and a phenol polymerized in pores and on the surface of the activated charcoal by heating at 150° to 200° C.
Claim 22
Dependent Claim
54 words
A metal ion adsorbent stable at temperatures up to about 300° C. comprising activated charcoal and an oxine having the following structure: ##STR7## or its derivative substituted at positions 2-7 of the structure; and a phenol polymerized in pores and on the surface of the activated charcoal by heating at 150° to 200° C.
Claim 23
Dependent Claim
19 words
An adsorbent according to claim 17, wherein the phenol is selected from the group consisting of phenol and resorcinol.
Claim 24
Dependent Claim
73 words
A process for preparing a metal ion adsorbent, which comprises adsorbing oxine onto activated charcoal, aging the oxine adsorbed activated charcoal, adsorbing resorcinol powder onto the oxine adsorbed activated charcoal, adding an aqueous formaldehyde solution and then formic acid to the activated charcoal, followed by mixing and aging, and heating the activated charcoal at 150° to 200° C., thereby copolymerizing the oxine with resorcinol in pores on the surface of the activated charcoal.
Claim 25
Dependent Claim
73 words
A process for preparing a metal ion adsorbent, which comprises adsorbing oxine onto activated charcoal, aging the oxine adsorbed activated charcoal, adsorbing resorcinol powder onto the oxine adsorbed activated charcoal, adding an aqueous formaldehyde solution and then formic acid to the activated charcoal, followed by mixing and aging, and heating the activated charcoal at 150° to 200° C., thereby copolymerizing the oxine with resorcinol in pores on the surface of the activated charcoal.
Claim 26
Dependent Claim
71 words
The process according to claim 19, wherein 40 grams of oxine are adsorbed on 200 grams of activated charcoal and the mixture ages for about three hours; wherein 6.7 grams of resorcinol are adsorbed are adsorbed on the charcoal and further wherein 25 ml of 30 percent formaldehyde solution and 15 ml of formic acid are added and the mixture is aged for about three hours at 80° C. before heating.
Claim 27
Dependent Claim
78 words
A process for preparing a metal ion adsorbent, which comprises adding oxine to activated charcoal, shaking and then leaving the mixture for a few hours, adding an aqueous formaldehyde solution thereto, shaking the mixture, thereby making the mixture uniform, adding a sodium hydroxide solution thereto, followed by mixing and aging, washing the mixture with warm water, and heating the mixture at 150° to 200° C., thereby polymerizing the oxine in pores on the surface of the activated charcoal.
Claim 28
Dependent Claim
78 words
A process for preparing a metal ion adsorbent, which comprises adding oxine to activated charcoal, shaking and then leaving the mixture for a few hours, adding an aqueous formaldehyde solution thereto, shaking the mixture, thereby making the mixture uniform, adding a sodium hydroxide solution thereto, followed by mixing and aging, washing the mixture with warm water, and heating the mixture at 150° to 200° C., thereby polymerizing the oxine in pores on the surface of the activated charcoal.
Claim 29
Dependent Claim
87 words
The process according claim 21, wherein 20 grams of oxine are adsorbed and 200 grams of activated charcoal and the mixture ages for about three hours; wherein 15 ml of 37 percent aqueous formaldehyde solution are added; wherein 210 ml of 30 percent sodium hydroxide are added and the mixture mixed for about two hours at 80° C. and aged for about four hours at 80° C.; and further wherein the resulting mixture is washed with 500 ml of water before heating at 150° to 200° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |