GB755216A - Improvements in or relating to recovery of cyclopentadiene and methylcyclopentadieneby liquid vapor phase cracking - Google Patents

Improvements in or relating to recovery of cyclopentadiene and methylcyclopentadieneby liquid vapor phase cracking

Info

Publication number
GB755216A
GB755216A GB22023/53A GB2202353A GB755216A GB 755216 A GB755216 A GB 755216A GB 22023/53 A GB22023/53 A GB 22023/53A GB 2202353 A GB2202353 A GB 2202353A GB 755216 A GB755216 A GB 755216A
Authority
GB
United Kingdom
Prior art keywords
tower
cyclopentadiene
cracking
zone
codimers
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
Application number
GB22023/53A
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.)
ExxonMobil Technology and Engineering Co
Original Assignee
Exxon Research and Engineering Co
Esso Research and Engineering 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 Exxon Research and Engineering Co, Esso Research and Engineering Co filed Critical Exxon Research and Engineering Co
Publication of GB755216A publication Critical patent/GB755216A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C4/00—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms
    • C07C4/22—Preparation of hydrocarbons from hydrocarbons containing a larger number of carbon atoms by depolymerisation to the original monomer, e.g. dicyclopentadiene to cyclopentadiene
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C2601/00—Systems containing only non-condensed rings
    • C07C2601/06—Systems containing only non-condensed rings with a five-membered ring
    • C07C2601/10—Systems containing only non-condensed rings with a five-membered ring the ring being unsaturated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Cyclopentadiene is recovered from a cracked petroleum fraction containing from 20-93 wt. per cent of dimers or codimers of the said compound and methyl cyclopentadiene and boiling at from 150 DEG to 220 DEG C. by heating the petroleum fraction in the vapour phase for a time of 1 to 30 seconds to a temperature sufficient to convert the dimers and codimers of the two said compounds to monomers while simultaneously contacting the vapours in a cracking zone countercurrently with a thermally stable organic liquid heated to a temperature of 300 DEG to 500 DEG C., cooling unabsorbed vapours leaving the cracking zone to liquefy C6 and above monomers in a first fractionating zone and recovering separated cyclopentadiene. The liquid condensate from the first fractionating zone may be transferred to a second fractionating zone for the recovery of methyl cyclopentadiene. The preferred starting material is a steam-cracked petroleum fraction containing 55 to 82, preferably 60-75, wt. per cent of dimers and codimers of the two cyclodienes, wherein at least 85 volume per cent boils between 170 DEG and 220 DEG C. The thermally stable liquid, which may be a saturated hydrocarbon oil having a minimum boiling point of 370 DEG C., is heated in a furnace, fed to the cracking tower, preferably at multiple points such that all zones of the tower operate at about 350 DEG C., and returned from the bottom of the tower to the furnace. Instead of injecting hot oil at various points, the tower may be heated electrically to maintain a temperature of about 350 DEG C. The overhead vapours from the cracking tower, maintained at 220-230 DEG C., are fed to a first fractionating tower having 10-15 plates and quenched to 70-80 DEG C. by the liquid reflux of methyl cyclopentadiene. The cyclopentadiene is removed overhead at about 450 DEG C., and the bottoms are fractionated in a second tower to obtain methylcyclopentadiene. Examples are given.
GB22023/53A 1952-09-25 1953-08-10 Improvements in or relating to recovery of cyclopentadiene and methylcyclopentadieneby liquid vapor phase cracking Expired GB755216A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US755216XA 1952-09-25 1952-09-25

Publications (1)

Publication Number Publication Date
GB755216A true GB755216A (en) 1956-08-22

Family

ID=22126315

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22023/53A Expired GB755216A (en) 1952-09-25 1953-08-10 Improvements in or relating to recovery of cyclopentadiene and methylcyclopentadieneby liquid vapor phase cracking

Country Status (1)

Country Link
GB (1) GB755216A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078571B (en) * 1956-10-11 1960-03-31 Exxon Research Engineering Co Process for the production of cyclopentadiene and methylcyclopentadiene

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1078571B (en) * 1956-10-11 1960-03-31 Exxon Research Engineering Co Process for the production of cyclopentadiene and methylcyclopentadiene

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