US4522951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of Mg++ and Ca++ ions from NaCl brine
Assignee: Dow Chemical Co
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Filing: 1983-09-19
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Granted: 1985-06-11
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Expires: 2003-09-19
Abstract
Abstract Alkaline earth metal ions, e.g., Mg ++ and/or Ca ++ , are removed from alkali metal brines, e.g., NaCl, by use of a particulate, macroporous, anion exchange resin containing the in-situ reaction product of polymeric, amorphous, hydrous zirconium oxide and a source of PO 4 --- ions, e.g., H 3 PO 4 .
Inventors
- 👤 John M. Lee
- 👤 William C. Bauman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:51
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/14; C01D3/145; B; B01; B01J; B01J41/00; B01J41/08; B01J41/10; B01J47/00; B01J47/018
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
99 words
A method for substantially removing alkaline earth metal ions from a NaCl brine feed to an electrolytic cell wherein NaCl is electrolyzed to produce chlorine and sodium hydroxide, said method comprising passing said NaCl brine through a vessel containing a particulate, macroporous, anion exchange resin composite containing therein the post-deposited in-situ reaction product of polymeric amorphous hydrous zirconium oxide and a source of PO 4 --- ions, removing from contact with said composite in said vessel, the NaCl brine with its alkaline earth metal ions being substantially removed, and thereafter feeding said NaCl brine to the said electrolytic cell.
Claim 2
Independent Claim
99 words
A method for substantially removing alkaline earth metal ions from a NaCl brine feed to an electrolytic cell wherein NaCl is electrolyzed to produce chlorine and sodium hydroxide, said method comprising passing said NaCl brine through a vessel containing a particulate, macroporous, anion exchange resin composite containing therein the post-deposited in-situ reaction product of polymeric amorphous hydrous zirconium oxide and a source of PO 4 --- ions, removing from contact with said composite in said vessel, the NaCl brine with its alkaline earth metal ions being substantially removed, and thereafter feeding said NaCl brine to the said electrolytic cell.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein the alkaline earth metal ions comprise Mg ++ and/or Ca ++ .
Claim 4
Dependent Claim
27 words
The method of claim 1 wherein the resin of the composite comprises an anion exchange resin of styrene crosslinked with divinylbenzene and having amine groups attached thereto.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the source of PO 4 --- ion comprises H 3 PO 4 .
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein the resin of the composite comprises a particulate, macroporous polymer of styrene crosslinked with divinylbenzene and having tertiary amine groups attached thereto.
Claim 7
Dependent Claim
21 words
The method of claim 1 wherein the pH of the brine is in the range of about 5 to about 8.5.
Claim 8
Dependent Claim
22 words
The method of claim 1, using a brine having a temperature in the range of about 20° C. to about 100° C.
Claim 9
Dependent Claim
22 words
The method of claim 1, using a brine having a temperature in the range of about 50° C. to about 60° C.
Claim 10
Dependent Claim
49 words
The method of claim 1 wherein the contacting of the brine with the resin composite is performed in a column containing 1 bed volume of the resin and where the brine is flowed through the bed at the rate of about 0.001 to about 0.2 bed volumes per minute.
Claim 11
Dependent Claim
25 words
The method of claim 1 wherein the flow rate of the brine through the bed is about 0.01 to about 0.08 bed volumes per minute.
Claim 12
Dependent Claim
27 words
The method of claim 1 wherein the resin of the composite comprises an anion exchange resin of styrene crosslinked with divinylbenzene and having amine groups attached thereto.
Claim 13
Independent Claim
95 words
A method for determining the presence of Mg ++ and/or Ca ++ ions in an alkali metal brine solution, said method comprising passing said alkali metal brine solution through a column packed with a particulate, macroporous anion exchange resin composite containing therein the in-situ reaction product of polymeric amorphous hydrous zirconium oxide and source of PO 4 --- ions, removing the said brine from said column, and analyzing the said resin for Mg ++ and/or Ca ++ ions by dissolving said ions from the resin and determining the amount of said ions in the solute.
Claim 14
Independent Claim
95 words
A method for determining the presence of Mg ++ and/or Ca ++ ions in an alkali metal brine solution, said method comprising passing said alkali metal brine solution through a column packed with a particulate, macroporous anion exchange resin composite containing therein the in-situ reaction product of polymeric amorphous hydrous zirconium oxide and source of PO 4 --- ions, removing the said brine from said column, and analyzing the said resin for Mg ++ and/or Ca ++ ions by dissolving said ions from the resin and determining the amount of said ions in the solute.
Claim 15
Dependent Claim
19 words
The method of claim 12 wherein the source of PO 4 --- ion comprises H 3 PO 4 .
Claim 16
Dependent Claim
28 words
The method of claim 12 wherein the resin of the composite comprises a particulate, macroporous polymer of styrene crosslinked with divinylbenzene and having tertiary amine groups attached thereto.
Claim 17
Dependent Claim
21 words
The method of claim 12 wherein the pH of the brine is in the range of about 5 to about 8.5.
Claim 18
Dependent Claim
22 words
The method of claim 12, using a brine having a temperature in the range of about 20° C. to about 100° C.
Claim 19
Dependent Claim
22 words
The method of claim 12, using a brine having a temperature in the range of about 50° C. to about 60° C.
Claim 20
Dependent Claim
49 words
The method of claim 12 wherein the contacting of the brine with the resin composite is performed in a column containing 1 bed volume of the resin and where the brine is flowed through the bed at the rate of about 0.001 to about 0.2 bed volumes per minute.
Claim 21
Dependent Claim
25 words
The method of claim 12 wherein the flow rate of the brine through the bed is about 0.01 to about 0.08 bed volumes per minute.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
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