Patent US3884846A successfully refreshed from Google Patents.
US3884846A
Expired / Lapsed
US
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Process for producing materials which complex heavy metals in liquid
Assignee: Tosoh Corp
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Filing: 1973-05-17
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Granted: 1975-05-20
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Expires: 1993-05-17
Abstract
Abstract A process is described for the separation of heavy metals from solutions by treating solutions containing the heavy metals with partially dehydrochlorinated polyvinylchloride whose ability to complex heavy metals is enhanced by treatment with at least one reagent selected from the group consisting of urea, ammonia and amines and/or at least one reagent selected from the group consisting of thiols, thiazoles, dithiocarbamates, thiourea, guanidine, thiolignin, carbon disulfide, sodium hydrosulfide and thiocyanates.
Inventors
- 👤 Susumu Otsuki
- 👤 Isao Miyanohara
- 👤 Norimasa Mizui
- 👤 Hideo Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:12
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/5272; B; B01; B01J; B01J20/00; B01J20/22; B01J20/26; B01J20/265; C02F1/28; C02F1/285; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
A PROCESS FOR THE PRODUCTION OF A HEAVY METAL COMPLEXING MATERIAL WHICH COMPRISES REACTING A REACTION PRODUCT FROM THE PARTIAL DEHYDROCHLORINATION REACTION OF POLYVINYLCHLORIDE FROM WHICH 5-90% OF ITS CHLORINE CONTENT IS REMOVED, WITH AT LEAST ON AMINE REAGENT SELECTED FROM THE GROUP CONSISTING OF ALKYLAMINES, ALKYLPOLYAMINES, AND HYDROXYAMINES.
Claim 2
Dependent Claim
49 words
A PROCESS FOR THE PRODUCTION OF A HEAVY METAL COMPLEXING MATERIAL WHICH COMPRISES REACTING A REACTION PRODUCT FROM THE PARTIAL DEHYDROCHLORINATION REACTION OF POLYVINYLCHLORIDE FROM WHICH 5-90% OF ITS CHLORINE CONTENT IS REMOVED, WITH AT LEAST ON AMINE REAGENT SELECTED FROM THE GROUP CONSISTING OF ALKYLAMINES, ALKYLPOLYAMINES, AND HYDROXYAMINES.
Claim 3
Dependent Claim
15 words
The process of claim 1, wherein said reaction product is a particulate or powder material.
Claim 4
Dependent Claim
16 words
The process of claim 1, wherein said reaction is conducted in a solvent for said reagent.
Claim 5
Dependent Claim
22 words
The process of claim 3, wherein said solvent is selected from the group consisting of water, dimethylformamide, dimethylsulfoxide, ethyleneglycol, glycerine and nitrobenzene.
Claim 6
Dependent Claim
14 words
The process of claim 4 wherein said reaction is conducted at 50* to 200*C.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein said reaction is conducted under pressure.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the amine is selected from the group consisting of diethanolamine, ethylenediamine, hexamethylenediamine and triethylenetetramine.
Claim 9
Dependent Claim
19 words
The process of claim 1, wherein the partially dehydrochlorinated polyvinylchloride is obtained by the pyrolysis of a polyvinylchloride resin.
Claim 10
Dependent Claim
24 words
The process of claim 1, wherein the reaction product from the partial dehydrochlorination reaction of polyvinylchloride is pulverized before reaction with the amine reagent.
Claim 11
Dependent Claim
26 words
The process of claim 1, wherein the reaction product from the partial dehydrochlorination reaction of polyvinylchloride has from 10 - 60% of its chlorine content removed.
Claim 12
Dependent Claim
16 words
The process of claim 8, wherein the pyrolysis takes place at a temperature of from 150*-300*C.
Claim 13
Dependent Claim
41 words
The process of claim 1, which further comprises reacting the reaction product from the partial dehydrochlorination reaction of polyvinylchloride with at least one reagent selected from the group consisting of thiourea, ethylphenyl zinc dithiocarbamate, guanidine, carbondisulfide, sodium suLfide and sodium hydrosulfide.
References Cited (Backward Citations)
SU114943A1
Cited
NL6500661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |