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US3663574A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the continuous production of propylene oxide

Assignee: Daicel Corp
•
Filing: 1969-05-12
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Granted: 1972-05-16
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Expires: 1989-05-12
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Abstract

Abstract PROPYLENE OXIDE IS PRODUCED BY INCORPORATING BUBBLES OF PROPYLENE GAS AT A PRESSURE IN THE RANGE OF 3-50 KG./SQ. CM. GAUGE INTO AN ORGANIC SOLVENT SOLUTION OF PERACETIC ACID AND FORWARDING THE REACTANTS IN CONCURRENT FLOW THROUGH A SERIES OF REACTION ZONES SEPARATED BY PERFORATE MEMBERS WHOSE PERFORATIONS HAVE A DIAMETER IN THE RANGE OF 2 TO 10 MM. AND A PERFORATION RATIO OF 1 TO 20%. THE FLOW RATE OF THE SOLUTION IS LESS THAN 2000 IN REYNOLDS NUMBER AND THE SUPERFICIAL VELOCITY OF THE PROPYLENE BUBBLES IS IN THE RANGE OF 0.05-50 CM./SEC. THE TEMPERATURE IN THE REACTION SYSTEM IS IN THE RANGE OF 30*C. TO 80% C. AND THE MEAN RESIDENCE TIME OF THE REACTANTS IN THE REACTION SYSTEM IS IN THE RANGE OF 30 TO 180 MINUTES.

Inventors

  • 👤 Kazuo Yamagishi
  • 👤 Osamu Kageyama
  • 👤 Yoshiaki Numa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 07:13
CPC Classifications
C; C07; C07D; C07D301/00; C07D301/02; C07D301/03; C07D301/14

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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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) 1975-05-16 1975-11-15 1976-05-16 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-16 1979-11-15 1980-05-16 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-16 1983-11-15 1984-05-16 $7700.00 Window Closed / Lapsed

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