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US3681897A Expired / Lapsed US ⏱️ 0.0 years remaining

Solvent skimming device for caustic washer

Assignee: Phillips Petroleum Co
•
Filing: 1970-08-11
•
Granted: 1972-08-08
•
Expires: 1990-08-11
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Abstract

Abstract Apparatus is provided for treating a cracked hydrocarbon gas, e.g., an effluent resulting from the pyrolytic conversion of a feed, consisting essentially of ethane to form ethylene, is treated with an alkali wash, in an apparatus comprising in one embodiment thereof means for a complete treatment of said gas, a tower in which in its lower portion there is a partition extending upwardly from a point near the tower bottom to provide at least two sections in the bottom of the tower, means for introducing gas into the tower, the partition providing in the bottom of the tower an essentially gas-free section, means for also introducing into said tower a solvent for treating said treating solution, means for withdrawing treating solution from said gas-free section, means for withdrawing solvent from a place in said gas-free section, and means for shielding or baffling said place; there being provided above the sections formed by the partition a top section for water washing gas to remove therefrom any entrained treating solution and/or solvent; and a section below said top section for treating gas with treating solution a section below the last mentioned section for treating gas with further treating solution and/or with solvent, introduced to dissolve from said treating solution a polymer formed therein and/or polymer forming constituents. Apparatus is also provided for treating the used solvent by contact with an adsorbent, e.g., activated charcoal or carbon or functional equivalent, to remove from the solvent polymer and polymer-forming constituents, rendering the solvent suitable for reuse and avoiding ultimate plugging of pumps, pipes, heat exchangers and other equipment.

Inventors

  • 👤 Norris W Mitchell
  • 👤 Frank W Skraba
  • 👤 William L Houston Jr

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 21:19
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/06; C; C07; C07C; C07C7/00; C07C7/11

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 75 words
An apparatus according to claim 1 having in said vessel, above said second means for feeding a gas to be treated, a section into which said first means for feeding into an upper portion of said vessel an aqueous treating agent feeds said agent, and wherein said fifth means for introducing said solvent into said vessel is in communication with said section and is thus capable to introduce said solvent at least into said section.
Claim 2
Dependent Claim 94 words
An apparatus according to claim 1 wherein the vessel is composed of at least four superimposed sections, a top section to remove caustic carryover as by a water wash, a section below said top section wherein gas rising through said sections is treated with a strong caustic wash, a next lower section wherein the gas is treated with a dilute caustic wash to remove polymer and polymer-forming constituents therefrom, and a bottom section forming said lower portion of said vessel in which said quiescent zone is provided and from which said solvent is removed.
Claim 3
Dependent Claim 81 words
An apparatus according to claim 3 wherein means are provided in the top section of said vessel to circulate a water wash therein, means are provided to permit gas flowing up the tower to enter into the bottom of said top section and means are associated with said top section to permit a portion of water containing treating solution entrained thereinto by a treated gas and recovered in said top section to pass into the section immediately below said top section.
Claim 4
Dependent Claim 55 words
An apparatus according to claim 4 wherein associated with the section below said top section means are provided to circulate a strong treating solution into contact with the gas and wherein means are provided to permit a portion of the thus used treating solution to pass downwardly into said next lower section of the vessel.
Claim 5
Dependent Claim 87 words
An apparatus according to claim 5 wherein associated with said vessel and with said third means for removing liquid from said vessel from said quiescent zone there is an apparatus means wherein used solvent containing solid polymer and polymer-forming constituents removed from said gas into said aqueous-treating agent and from said treating agent into said solvent is contacted with a further treating agent to remove said solid polymer and polymer-forming constituents from said solvent and, further, means for returning thus treated solvent to said vessel for reuse.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-08 1976-02-07 1976-08-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-08 1980-02-07 1980-08-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-08 1984-02-07 1984-08-08 $7700.00 Window Closed / Lapsed

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