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

Foam prevention in extractive stripping of sulfolane solvent extract Download PDF

Info

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
Authority
US
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
Other languages
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shell Oil Co filed Critical Shell Oil Co
Application granted granted Critical
Publication of US3661773A publication Critical patent/US3661773A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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.

Landscapes

  • 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

Family

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 (fr)
BE (1) BE743511A (fr)
CA (1) CA925810A (fr)
DE (1) DE1964149C2 (fr)
FR (1) FR2027022A1 (fr)
GB (1) GB1291485A (fr)
NL (1) NL161734C (fr)

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

Similar Documents

Publication Publication Date Title
US2771494A (en) Selective solvent extraction of naphthene hydrocarbons employing 2-pyrrolidone
US3114783A (en) Separation of aromatics from hydrocarbon streams
US2831905A (en) Gamma-butyrolactone as a selective solvent for hydrocarbons
US2737538A (en) 2-pyrrolidone as a selective solvent for aromatic hydrocarbons
US2395362A (en) Separation of hydrocarbons
US2936283A (en) Extraction process wherein the desired material is recovered by azeotropic distillation of the extract
US3435087A (en) Recovery of aromatics
US2786085A (en) Solvent extraction process applied to feed stocks of high boiling points
US3396101A (en) Solvent extraction of highly aromatic charge stocks
US3661773A (en) Foam prevention in extractive stripping of sulfolane solvent extract
US2463479A (en) Preparation of aromatic solvents
US2834822A (en) Toluene
US3725255A (en) Process for separating aromatic hydrocarbons from mixtures containingthem by liquid-liquid extraction and azeotropic distillation
US2848387A (en) Separation of aromatic and nonaromatic hydrocarbons
US3431199A (en) Method of separating aromatic hydrocarbons from mixtures containing them
US2803685A (en) Process for the extraction and recovery of aromatic hydrocarbons from hydrocarbon mixtures
US3059037A (en) Extractive distillation process
US2794839A (en) Process for simultaneous recovery of aromatic and naphthenic hydrocarbons from hydrocarbon mixtures
US2936325A (en) Substituted amides as selective solvents for aromatic hydrocarbons
US3595933A (en) Process for the separation of organic compounds by extraction with 1,3-dicyanobutane
US3436435A (en) Recovery of aromatics
US2109157A (en) Solvent extraction process
US2724682A (en) Sulfur dioxide extraction process
US3449462A (en) Separation process
US3520946A (en) Recovery of aromatics with improved xylene purity