US4892625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing high purity chemicals
Assignee: MOSES LAKE INDUSTRIES Inc 780 RANDOLPH ROAD MOSES LAKE WASHINGTON 98837
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Filing: 1987-06-23
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Granted: 1990-01-09
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Expires: 2007-06-23
Abstract
Abstract A distillable liquid containing non-volatile impurities is freed of those impurities by boiling the liquid to form vapors of the liquid, passing the vapors through a packed column heated to a temperature such that liquid entrained in the vapors is completely vaporized and the non-volatile impurities remain in the packed column, and condensing the vapors from the column.
Inventors
- 👤 Shumpei Shimizu
- 👤 Mamoru Yoshizako
- 👤 Toshitsura Cho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:21
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/43; C07C51/44; B; B01; B01D; B01D3/00; C01; C01B; C01B11/00; C01B11/16; C01B21/00; C01B21/20; C01B21/38; C01B21/46; C01B7/00; C01B7/01; C01B7/07; C01B7/0706; C01B7/0712; C01B7/13; C01B7/135; C01B7/19; C01B7/191; C01B7/195; C01B7/196; C07C17/00; C07C17/38; C07C17/383; C07C45/00; C07C45/78; C07C45/81; C07C45/82; Y; Y10; Y10S; Y10S203/00; Y10S203/11
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
161 words
A method for the distillation in a distillation device of an inorganic acid having non-volatile matter impurities therein, said distillation device comprising a heating section, a contacting section and a condensing section, to obtain the inorganic acid essentially free of non-volatile matter impurities, said method consisting essentially of: (a) boiling the inorganic acid in the heating section to form vapors of the inorganic acid; (b) contacting the vapors of the inorganic acid from the heating section with a contact member inert to said vapors in the contacting section, said vapors being passed through the contacting section at a flow rate of 0.01 to 10 sec -1 per unit volume of the contacting section; (c) heating the contacting section at a temperature of 1 to 100° C. higher than the boiling point of the inorganic acid being distilled and maintaining the inorganic acid completely vaporized in the contacting section; and (d) condensing the vapors from the contacting section in the condensing section.
Claim 2
Independent Claim
161 words
A method for the distillation in a distillation device of an inorganic acid having non-volatile matter impurities therein, said distillation device comprising a heating section, a contacting section and a condensing section, to obtain the inorganic acid essentially free of non-volatile matter impurities, said method consisting essentially of: (a) boiling the inorganic acid in the heating section to form vapors of the inorganic acid; (b) contacting the vapors of the inorganic acid from the heating section with a contact member inert to said vapors in the contacting section, said vapors being passed through the contacting section at a flow rate of 0.01 to 10 sec -1 per unit volume of the contacting section; (c) heating the contacting section at a temperature of 1 to 100° C. higher than the boiling point of the inorganic acid being distilled and maintaining the inorganic acid completely vaporized in the contacting section; and (d) condensing the vapors from the contacting section in the condensing section.
Claim 3
Dependent Claim
22 words
A method according to claim 1, wherein the inorganic acid is hydrochloric acid, nitric acid, hydrofluoric acid perchloric acid or hydroiodic acid.
Claim 4
Dependent Claim
12 words
A method according to claim 1, wherein the impurities are metal impurities.
Claim 5
Dependent Claim
19 words
A method according to claim 1, wherein the contact member is silica gel, alumina, teflon, glass, quartz or graphite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |