US3939217A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alcohol purification process
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1975-02-24
•
Granted: 1976-02-17
•
Expires: 1995-02-24
Abstract
Abstract In the clean-up and recovery of isopropanol used to deash polypropylene prepared by the polymerization of propylene in the presence of a TiCl 3 .AlCl 3 catalyst, the neutralized bottoms from the first stage of a two stage evaporization of isopropanol are deashed by adding a small quantity of water, which causes flocculation of a substantial portion of the ash in the bottoms which are separated from liquids in the system by centrifuging, with the centrate going to the second stage evaporization in which substantially only amorphous polypropylene is left as bottoms.
Inventors
- 👤 Herbert W. H. Meyer, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:07
CPC Classifications
C; C08; C08J; C08J11/00; C08J11/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
65 words
A process for the recovery of lower alkanol used to deash alpha-olefin polymer wherein the alkanol after deashing comprises a mixture of said alkanol, contaminates and amorphous alpha-olefin polymer which comprises adding a minor amount of water to said mixture to form a floc containing a substantial portion of said contaminates, centrifuging said mixture to remove the floc therefrom, and thereafter evaporating to recover alkanol.
Claim 2
Dependent Claim
65 words
A process for the recovery of lower alkanol used to deash alpha-olefin polymer wherein the alkanol after deashing comprises a mixture of said alkanol, contaminates and amorphous alpha-olefin polymer which comprises adding a minor amount of water to said mixture to form a floc containing a substantial portion of said contaminates, centrifuging said mixture to remove the floc therefrom, and thereafter evaporating to recover alkanol.
Claim 3
Dependent Claim
17 words
The process according to claim 1 wherein the temperature is in the range of 90° to 250°F.
Claim 4
Dependent Claim
23 words
The process according to claim 2 wherein about 0.1 to 5 volume percent water based on the volume of alkanol present is added.
Claim 5
Dependent Claim
23 words
The process according to claim 3 wherein said process is batch and the volume percent of water added is about 0.1 to 1.0.
Claim 6
Dependent Claim
23 words
The process according to claim 3 wherein said process is continuous and the volume percent of water added is about 0.3 to 2.0.
Claim 7
Dependent Claim
22 words
The process according to claim 1 wherein said contaminates are present in about 5 to 30 weight percent based on the alkanol
Claim 8
Dependent Claim
14 words
The process according to claim 6 wherein contaminates comprise Ti, Al, Na, and Cl.
Claim 9
Dependent Claim
21 words
The process according to claim 1 wherein the pH of the flocculation system is in the range of 4 to 12.
Claim 10
Dependent Claim
17 words
The process according to claim 8 wherein the pH is in the range of 6 to 10.
Claim 11
Dependent Claim
23 words
The proess according to claim 1 wherein from 1 to 15 weight percent based on water of a trivalent metal electrolyte is present.
Claim 12
Dependent Claim
34 words
The process according to claim 1 wherein up to 40 volume percent of a C 5 to C 8 hydrocarbon is present as a cosolvent in the lower alkanol used to deash said polymer.
Claim 13
Dependent Claim
17 words
The process according to claim 9 wherein the pH is in the range of 6.5 to 7.5.
Claim 14
Dependent Claim
17 words
The process according to claim 1 wherein said alkanol is a C 1 to C 6 alkanol.
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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |