US4125482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing magnesium oxide impregnated activated carbon
Assignee: Calgon Carbon Corp
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Filing: 1977-03-22
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Granted: 1978-11-14
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Expires: 1997-03-22
Abstract
Abstract A novel impregnated activated carbon, containing from about 1.0 percent to about 15.0 percent by weight of MgO, has been found to be useful in a method of decolorizing a crude vegetable oil or a degummed vegetable oil, and removing organic acids therefrom, as well as in a process for making a refined edible vegetable oil wherein a crude vegetable oil is degummed, passed through the impregnated activated carbon, and subjected to steam distillation at reduced pressure. A novel method of preparing the MgO impregnated activated carbon has also been discovered.
Inventors
- 👤 Rabindra K. Sinha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:29
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; B01J20/04; B01J20/041; B01J20/30; B01J20/32; B01J20/3202; B01J20/3204; B01J20/3231; B01J20/3234; B01J20/3236; C; C11; C11B; C11B3/00; C11B3/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
A method of preparing an activated carbon impregnated with from about 1.0 percent to about 15.0 percent by weight of magnesium oxide, comprising: (a) admixing the activated carbon to be impregnated with an aqueous solution of a sufficient amount of a water soluble magnesium salt to result in from about 1.0% to about 15.0% by weight magnesium oxide in the final activated carbon product; (b) drying said mixture; (c) admixing with the dried product of the previous step an aqueous solution of a stoichiometric amount of sodium hydroxide; (d) drying said mixture; (e) calcining the product of the previous step at a temperature of from about 550° to about 650° F. in an inert atmosphere for from about 0.25 to about 1.0 hours; (f) water washing the product of the previous step until the sodium ion concentration of the wash effluent is less than 1.0 part per million; and (g) drying the product of the previous step to recover the final product.
Claim 2
Independent Claim
162 words
A method of preparing an activated carbon impregnated with from about 1.0 percent to about 15.0 percent by weight of magnesium oxide, comprising: (a) admixing the activated carbon to be impregnated with an aqueous solution of a sufficient amount of a water soluble magnesium salt to result in from about 1.0% to about 15.0% by weight magnesium oxide in the final activated carbon product; (b) drying said mixture; (c) admixing with the dried product of the previous step an aqueous solution of a stoichiometric amount of sodium hydroxide; (d) drying said mixture; (e) calcining the product of the previous step at a temperature of from about 550° to about 650° F. in an inert atmosphere for from about 0.25 to about 1.0 hours; (f) water washing the product of the previous step until the sodium ion concentration of the wash effluent is less than 1.0 part per million; and (g) drying the product of the previous step to recover the final product.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein the water soluble magnesium salt is magnesium chloride hexahydrate.
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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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |