US3661773A - Foam prevention in extractive stripping of sulfolane solvent extract - Google Patents

Foam prevention in extractive stripping of sulfolane solvent extract Download PDF

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Publication number
US3661773A
US3661773A US864727A US3661773DA US3661773A US 3661773 A US3661773 A US 3661773A US 864727 A US864727 A US 864727A US 3661773D A US3661773D A US 3661773DA US 3661773 A US3661773 A US 3661773A
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United States
Prior art keywords
sulfolane
aromatics
extract
weight
hydrocarbons
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US864727A
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English (en)
Inventor
Frederik J Zuiderweg
Hendrik J Scheffer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell USA Inc
Original Assignee
Shell Oil Co
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Filing date
Publication date
Application filed by Shell Oil Co filed Critical Shell Oil Co
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Publication of US3661773A publication Critical patent/US3661773A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
    • B01D3/34—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping with one or more auxiliary substances
    • B01D3/40—Extractive distillation

Definitions

  • This invention relates to an improved process for separating and recovering aromatics from mixtures of gasoline boiling range hydrocarbons by extraction with Sulfolane. More particularly it relates to the recovery of aromatics from a Sulfolane extract.
  • the parainic hydrocarbon which is added to the extractive stripper feed is liquid and preferably has an initial boiling point that is from about 20 C. to about C. higher than the end boiling point of the nonaromatics in the hydrocarbon feed mixture. Most preferably, the added liquid heavy hydrocarbon has an initial boiling point that is from about 30 C. to about 75 C. higher than the end boiling point of the non-aromatics in the hydrocarbon feed mixture. Branchedand straightchain parains maybe used.
  • parans of from about 11 to 20 carbon atoms are very suitableA as added heavy hydrocarbons.
  • a very suitable source of heavy paraiiins for use with gasoline boiling range hydrocarbons is an essentially aromatics-free paraffin kerosene or a gas oil boiling range mixture of paraflns.
  • p v i Only minor amounts of heavy paraflinic hydrocarbon need be added to the stripper to obtain the benefit of the invention.
  • Additions of from about 0.001 p.p.m. by weight to about p.p.m. by weight, based on the feed to the stripper are suitable with amounts of from about 0.002 p.p.m. by weight to about 20 p.p.m. by weight being very suitable and amounts of from about 0.005 p.p.m. by weight to about 10 p.p.m. by weight being preferred.
  • a mixed hydrocarbon stream containing about 60% by weight of aromatic hydrocarlbons of from about 6 to about 8 carbons and about 40% by Weight of parafnic hydrocarbons of 6 to 9 carbons and naphthenic hydrocarbons from 6 to 9 carbons is introduced continuously into the bottom of the liquid/liquid extractor 11, herein shown as a rotating disc contactor, through line 12.
  • Sulfolane tetramethylene sulfone
  • the two liquid streams are contacted in countercurrent.
  • a rafnate low in aromatics is removed through line 15 to phase separator 16 where the rainate phase is separated from a small Sulfolane extract phase.
  • the ratlinate phase is removed through line 17.
  • a Sulfolane extract stream is removed from extractor 11 through line 19 to phase separator 20 where a Sulfolane extract phase is separated and removed through line 21.
  • a small hydrocarbon phase is removed from phase separator 20 and either discarded through line 22 or returned to line 12 through line 24.
  • the Sulfolane extract phase from separator 16 passes part recycled to line 14 Y hithrough line 25 to line'21. About three p.p.m. by weight respectively.
  • Bozeman er n 208-321 HERBERT LEVINE, Primary Examiner i U.S. Cl. X.R.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US864727A 1968-12-24 1969-10-08 Foam prevention in extractive stripping of sulfolane solvent extract Expired - Lifetime US3661773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6818690.A NL161734C (nl) 1968-12-24 1968-12-24 Werkwijze voor het scheiden van een vloeibaar mengsel van koolwaterstoffen door destillatie in aanwezigheid van een selectief oplosmiddel en onder toevoeging van een hulpstof.

Publications (1)

Publication Number Publication Date
US3661773A true US3661773A (en) 1972-05-09

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ID=19805492

Family Applications (1)

Application Number Title Priority Date Filing Date
US864727A Expired - Lifetime US3661773A (en) 1968-12-24 1969-10-08 Foam prevention in extractive stripping of sulfolane solvent extract

Country Status (7)

Country Link
US (1) US3661773A (xx)
BE (1) BE743511A (xx)
CA (1) CA925810A (xx)
DE (1) DE1964149C2 (xx)
FR (1) FR2027022A1 (xx)
GB (1) GB1291485A (xx)
NL (1) NL161734C (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081354A (en) * 1975-11-03 1978-03-28 Uop Inc. Liquid-liquid extraction process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4081354A (en) * 1975-11-03 1978-03-28 Uop Inc. Liquid-liquid extraction process

Also Published As

Publication number Publication date
FR2027022A1 (xx) 1970-09-25
NL161734C (nl) 1980-03-17
CA925810A (en) 1973-05-08
GB1291485A (en) 1972-10-04
BE743511A (xx) 1970-06-22
DE1964149A1 (de) 1970-07-02
DE1964149C2 (de) 1982-12-09
NL6818690A (xx) 1970-06-26

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