High pressure process for polyethylene production
Abstract
Abstract AN IMPROVEMENT IN A PROCESS FOR POLYMERIZING ETHYLENE IS ACHIEVED BY SPLITTING THE FEED INTO AT LEAST TWO STREAMS, CONTINUOUSLY POLYMERIZING EACH OF THE STREAMS IN THE PRESENCE OF FREE-RADICAL INITIATOR AT ELEVATED PRESSURES AND TEMPERATURES IN SEPARATE REACTOR TUBES, QUENCHING THE RESULTING REACTION PRODUCT STREAM, AND SEPARATING AND RECOVERING POLYETHYLENE FROM THE REACTION PRODUCT STREAM. THE LENGTH OF EACH OF THE REACTOR TUBES IS DESIGNED SO THAT THE REACTION TEMPERATURE PEAK OCCURS WITHIN THE TUBE ADJACENT TO THE OUTLET AND IS CALCULATED BASED ON THE FOLLOWING EQUATION: L = (VW(TP-TI))/AR(3600) WHERE: $ IS THE SPECIFIC VOLUME IN UNITS OF CUBIC VOLUME OF ETHYLENE FEED PER UNIT OF WEIGHT, W IS THE ETHYLENE FEED RATE THROUGH THE REACTOR TUBE IN UNITS OF WEIGHT PER HOUR, TP IS THE PEAK TEMPERATURE OF THE REACTION, TT IS THE TEMPERATURE OF THE ETHYLENE FEED AT THE INLET OF THE REACTOR TUBE, A IS THE CROSS-SECTIONAL AREA OF THE REACTOR TUBE IN UNITS OF SQUARE LENGTH, R IS THE ETHYLENE REACTION RATE IN UNITS OF TEMPERATURE RISE PER SECOND, 3600 IS THE CONSTANT TO CONVERT SECONDS TO HOURS.
Inventors
- 👤 R Knight
Bibliographic Details
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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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |