US3887688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for refining aqueous solution of thiocyanate containing impurities
Assignee: Japan Exlan Co Ltd
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Filing: 1974-01-31
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Granted: 1975-06-03
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Expires: 1994-01-31
Abstract
Abstract Process for refining an aqueous solution of a thiocyanate containing impurities which involves (a) feeding an aqueous solution of a thiocyanate containing impurities to a cross-linked dextran layer so that the impurities and thiocyanate may be caught in said cross-linked dextran layer, (b) passing an eluent through said cross-linked dextran layer so that the impurities flow away together with the eluent, and (c) then further passing an eluent through the cross-linked dextran layer to recover the effluent containing the thiocyanate.
Inventors
- 👤 Yukio Shimosaka
- 👤 Masahiko Ozaki
- 👤 Jiro Negi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:07
CPC Classifications
C; C01; C01C; C01C3/00; C01C3/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
A PROCESS FOR REFINING AN AQUEOUS SOLUTION OF A THIOCYANATE CONTAINING IMPURITIES WHICH COMPRISES (A) FEEDING AN AQUEOUS SOLUTION OF A THIOCYANATE CONTAINING IMPURITIES TO A CROSS-LINKED DEXTRAN LAYER SO THAT THE IMPURITIES AND THIOCYANATE MAY BE CAUGHT IN SAID CROSS-LINKED DEXTRAN LAYER, (B) THEN PASSING AN ELUENT IN AN AMOUNT NECESSARY TO FLOW AWAY THE IMPURITIES THROUGH SAID CROSS-LINKED DEXTRAN LAYER SO THAT THE IMPURITIES MAY BE FLOWED AWAY TOGETHER WITH THE ELUENT, AND (C9 THEN FURTHER PASSING AN ELUENT THROUGH SAID CROSS-LINKED DEXTRAN LAYER SO THAT THE EFFLUENT CONTAINING THE THIOCYANATE MAY BE SEPARATED.
Claim 2
Dependent Claim
96 words
A PROCESS FOR REFINING AN AQUEOUS SOLUTION OF A THIOCYANATE CONTAINING IMPURITIES WHICH COMPRISES (A) FEEDING AN AQUEOUS SOLUTION OF A THIOCYANATE CONTAINING IMPURITIES TO A CROSS-LINKED DEXTRAN LAYER SO THAT THE IMPURITIES AND THIOCYANATE MAY BE CAUGHT IN SAID CROSS-LINKED DEXTRAN LAYER, (B) THEN PASSING AN ELUENT IN AN AMOUNT NECESSARY TO FLOW AWAY THE IMPURITIES THROUGH SAID CROSS-LINKED DEXTRAN LAYER SO THAT THE IMPURITIES MAY BE FLOWED AWAY TOGETHER WITH THE ELUENT, AND (C9 THEN FURTHER PASSING AN ELUENT THROUGH SAID CROSS-LINKED DEXTRAN LAYER SO THAT THE EFFLUENT CONTAINING THE THIOCYANATE MAY BE SEPARATED.
Claim 3
Dependent Claim
97 words
A process for refining an aqueous solution of a thiocyanate containing impurities which comprises (a) feeding an aqueous solution of a thiocyanate containing impurities to a cross-linked dextran layer so that the impurities and thiocyanate may be caught in said cross-linked dextran layer, (b) then passing an eluent in an amount necessary to flow away the impurities through said cross-linked dextran layer so that the impurities may be flowed away together with the eluent, and (c) then further passing an eluent through said cross-linked dextran layer so that the effluent eluent containing the thiocyanate may be separated.
Claim 4
Dependent Claim
97 words
A process for refining an aqueous solution of a thiocyanate containing impurities which comprises (a) feeding an aqueous solution of a thiocyanate containing impurities to a cross-linked dextran layer so that the impurities and thiocyanate may be caught in said cross-linked dextran layer, (b) then passing an eluent in an amount necessary to flow away the impurities through said cross-linked dextran layer so that the impurities may be flowed away together with the eluent, and (c) then further passing an eluent through said cross-linked dextran layer so that the effluent eluent containing the thiocyanate may be separated.
Claim 5
Dependent Claim
39 words
The process for refining an aqueous solution of a thiocyanate containing impurities as in claim 1 wherein a concentration of a thiocyanate in an aqueous solution to be refined is 0.01 % by weight to 60 % by weight.
Claim 6
Dependent Claim
39 words
The process for refining an aqueous solution of a thiocyanate containing impurities as in claim 2 wherein a concentration of a thiocyanate in an aqueous solution to be refined is 0.1 % by weight to 50 % by weight.
Claim 7
Dependent Claim
22 words
The process for refining an aqueous solution of a thiocyanate containing impurities as in claim 1 wherein the thiocyanate is sodium thiocyanate.
Claim 8
Dependent Claim
22 words
The process for refining an aqueous solution of a thiocyanate containing impurities as in claim 1 wherein the eluent is a water.
Claim 9
Dependent Claim
39 words
The process for refining an aqueous solution of a thiocyanate containing impurities as in claim 1 wherein the aqueous solution to be refined is an aqueous solution of a thiocyanate recovered in the process for producing acrylic synthetic fibers.
References Cited (Backward Citations)
US2871093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |