Patent US3862026A successfully refreshed from Google Patents.
US3862026A
Expired / Lapsed
US
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Adsorption of n-paraffins with graphite-alumina pellets
Assignee: Individual
•
Filing: 1974-01-09
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Granted: 1975-01-21
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Expires: 1994-01-09
Abstract
Abstract Graphite/alumina pellets formed from vacuum or gas ground graphite and alumina of pseudoboehmite structure, by mixing with water extruding and sintering, which are useful as selective adsorbents for normal paraffins e.g. in de-waxing waxy raffinates, are less corrosive to metals than pellets made from other types of alumina.
Inventors
- 👤 Gordon Charles Friend
- 👤 Charles John Geach
- 👤 Aleksander Jerzy Groszek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/52; B; B01; B01J; B01J20/00; B01J20/02; B01J20/20; C01; C01B; C01B32/00; C04B35/01; C04B35/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
34 words
A process as claimed in claim 1 in which the feed mixture is a petroleum fraction boiling between 300* and 700*C, and after adsorption the adsorbed normal hydrocarbons are desorbed off the graphite/alumina pellets.
Claim 2
Dependent Claim
21 words
A process as claimed in claim 2 in which the adsorption is carried out at a temperature of -50* to 200*C.
Claim 3
Dependent Claim
18 words
A process as claimed in claim 1 in which the graphite feed weight ratio is less than 1:1.
Claim 4
Dependent Claim
45 words
A process as claimed in claim 2 in which the process is carried out in the presence of a solvent liquid in which the adsorbed and subsequently desorbed compounds are soluble, and the volume ratio of solvent liquid to feed mixture is up to 50:1.
Claim 5
Dependent Claim
41 words
A process as claimed in claim 1 for separating waxes from feed mixtures containing waxes in which the process is carried out at a temperature of 0* to 50*C and in which the graphite:feed weight ratio is from 0.5:1 to 10:1.
Claim 6
Dependent Claim
104 words
A process for improving the heat and colour stability of a petroleum fraction selected from gas oils, lubricating oils and hydrocracked gas oils which comprises contacting the said petroleum fraction with graphite/alumina pellets, which pellets consist essentially of a 50-80 percent wt. of a gas or vacuum ground graphite of surface area 50-2000 square metres per gram and, as a binder, 6 to 50 percent wt, of alumina of pseudoboehmite structure of crystallite size less than 10 nanometres and of surface area 200-600 square metres per gram at a temperature of 50*- 200*C in a graphite: petroleum fraction weight ratio of 0.01 to 1:1.
Claim 7
Dependent Claim
23 words
A process as claimed in claim 1 wherein said graphite pellets have a particle size of 4 - 200 British Standard Seive mesh.
Claim 8
Dependent Claim
22 words
A process as claimed in claim 1 wherein said graphite pellets have a weight ratio of 1:1 to 9:1 of graphite: alumina.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |