US4402837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treatment of a liquid containing a nickel cyanide compound
Assignee: Dainichi Nippon Cables Ltd
•
Filing: 1981-05-21
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Granted: 1983-09-06
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Expires: 2001-05-21
Abstract
Abstract A process for continuous treatment of a liquid containing a nickel cyanide compound which comprises (1) continuously supplying the said liquid containing a water-soluble metal hydroxide in a content of not less than 0.5 mol per mol of the nickel cyanide compound to a continuous reactor through a supply pipe, steam being introduced into the supply pipe so as to heat the said liquid to a temperature of 175° to 200° C., (2) passing the said liquid through the reactor while maintaining the said liquid at the said temperature and (3) discharging from the reactor the liquid having a CN content lower than that of the liquid prior to the supply to the reactor.
Inventors
- 👤 Michihide Okugawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:54
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/025; C02F2101/00; C02F2101/10; C02F2101/16; C02F2101/18; C02F2101/20; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/903; Y10S210/904
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A process for continuous treatment of a liquid containing a nickel cyanide compound which comprises (1) incorporating the liquid with a water-soluble metal hydroxide so as to adjust the amount of the water-soluble metal hydroxide to be not less than 0.5 mol per mol of the nickel cyanide compound, (2) continuously supplying the liquid to a continuous reactor through a supply pipe, the liquid being heated to a temperature of 175° to 200° C. prior to the supply to the reactor by introducing steam into the supply pipe, (3) passing the liquid through the reactor with a retention time of not less than 10 minutes while maintaining the liquid within the said temperature range, and (4) discharging from the reactor the liquid having a CN content of not more than 1 ppm.
Claim 2
Dependent Claim
132 words
A process for continuous treatment of a liquid containing a nickel cyanide compound which comprises (1) incorporating the liquid with a water-soluble metal hydroxide so as to adjust the amount of the water-soluble metal hydroxide to be not less than 0.5 mol per mol of the nickel cyanide compound, (2) continuously supplying the liquid to a continuous reactor through a supply pipe, the liquid being heated to a temperature of 175° to 200° C. prior to the supply to the reactor by introducing steam into the supply pipe, (3) passing the liquid through the reactor with a retention time of not less than 10 minutes while maintaining the liquid within the said temperature range, and (4) discharging from the reactor the liquid having a CN content of not more than 1 ppm.
Claim 3
Dependent Claim
49 words
The process according to claim 1, wherein the initial liquid prior to the supply to the reactor is incorporated with a water-soluble metal hydroxide so as to adjust the content of the water-soluble metal hydroxide to be not less than 0.5 mol per mol of the nickel cyanide compound.
Claim 4
Dependent Claim
30 words
The process according to claim 1, wherein the liquid incorporated with the water-soluble metal hydroxide is pre-heated to a temperature lower than the temperature to be maintained in the reactor.
Claim 5
Dependent Claim
21 words
The process according to claim 1, wherein the pre-heating is effected by heat exchange with the liquid discharged from the reactor.
Claim 6
Dependent Claim
23 words
The process according to claim 1, wherein the nickel cyanide compound is a compound having a group of the formula: [Ni(CN) 4 ].
Claim 7
Dependent Claim
26 words
The process according to claim 5, wherein the nickel cyanide compound is K 2 [Ni(CN) 4 ] or Na 2 [Ni(CN) 4 ], or its hydrate.
Claim 8
Dependent Claim
20 words
The process according to claim 1, wherein the nickel cyanide compound is NiCN or Ni(CN) 2 , or its hydrate.
References Cited (Backward Citations)
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Cited
US3394080A
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US3464917A
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US3617567A
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US3945919A
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US4042502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |