US3628918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for production of polyethylene
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1970-05-15
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Granted: 1971-12-21
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Expires: 1990-05-15
Abstract
Abstract Polyethylene is produced by polymerization of ethylene along or with comonomers or telogens (modifiers) in an elongated tubular reactor having an inlet and outlet and at least one reaction zone and one cooling zone in the presence of free radical or free oxygen yielding initiator at elevated temperatures and pressures by passing the reaction mixture through each of the reaction zones of the tubular reactor having internal diameters between about 0.5 and 3 inches at bulk fluid velocities sufficient so that the Flow Number in each reaction zone is greater than 3.3 ft2./sec. Flow Number is defined as the bulk fluid velocity in ft./sec. times diameter in feet. With Flow Numbers in excess of 3.3 ft2./sec. in the reaction zones, it has been found that the effective reaction volume in the reaction zone has been increased and, accordingly, a more efficient process for producing a high quality polyethylene.
Inventors
- 👤 Charles D Beals
- 👤 George I Fitzpatrick
- 👤 Kim L O'hara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:41
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/242; B01J19/243; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00065; B01J2219/00074; B01J2219/00076; B01J2219/00081; B01J2219/00087; B01J2219/00094; B01J2219/00159; B01J2219/00162; C08F110/00; C08F110/02; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/8593; Y10T137/87571
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
25 words
A tubular reactor in accordance with claim 1 wherein the second tube means has a side stream inlet means between its inlet and its outlet.
Claim 2
Dependent Claim
26 words
A tubular reactor in accordance with claim 1 wherein the inlet means in said first and third tube means are connected to means for supplying initiator.
Claim 3
Dependent Claim
26 words
A tubular reactor according to claim 2 wherein the side stream inlet means in said second tube means is connected to means for supplying cooling media.
Claim 4
Dependent Claim
236 words
A tubular reactor having a length to diameter ratio at least 100-to -1 for producing polyethylene under high-pressure conditions which comprises; at least five tube means having different internal diameters within the range between 0.5 and 3.0 inches interconnected to provide an inlet and an outlet, said first tube means having an internal diameter between 0.5 and 2.5 inches, said second tube means having a larger internal diameter than said first tube means, said third tube means having a larger internal diameter than said second tube means, said fourth tube means having an internal diameter at least that of said second tube means and less than said third tube means, and said fifth tube means having a larger internal diameter than said fourth tube means, the interconnection between each of said tube means serving, respectively, as an outlet for the first tube means and an inlet for the second tube means and an outlet for the second tube means and an inlet for the third tube means, an outlet for the third tube means, an outlet for the fourth tube means and an inlet for the fifth tube means, said first, second and fourth tube means having inlet means, the inlet means for the first tube means being near its inlet, the inlet means for the second tube means being near its inlet, and the inlet means for the fourth tube means being near its inlet.
Claim 5
Dependent Claim
28 words
A tubular reactor in accordance with claim 5 wherein the second and fourth tube means each has a side stream inlet means between their inlets and outlets, respectively.
Claim 6
Dependent Claim
27 words
A tubular reactor in accordance with claim 5 wherein the inlet means in said first, third and fifth tube means are connected to means for supplying initiator.
Claim 7
Dependent Claim
26 words
A tubular reactor in accordance with claim 5 wherein the inlet means for the second and fourth means are connected to means for supplying cooling media.
Claim 8
Dependent Claim
32 words
A tubular reactor according to claim 5 wherein the diameter of said tube means are as follows: First 1 inch Second 1.25 inch Third 1.50 inch Fourth 1.25 inch Fifth 1.50 inch.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |