US3274100A - Separation processes using molecular sieves - Google Patents

Separation processes using molecular sieves Download PDF

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Publication number
US3274100A
US3274100A US275128A US27512863A US3274100A US 3274100 A US3274100 A US 3274100A US 275128 A US275128 A US 275128A US 27512863 A US27512863 A US 27512863A US 3274100 A US3274100 A US 3274100A
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Prior art keywords
boiling
hydrocarbons
fraction
sieve
treating
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US275128A
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English (en)
Inventor
Yeo Alan Arthur
Mowll Roger Templeton Lewis
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BP PLC
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BP PLC
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C9/00—Aliphatic saturated hydrocarbons
    • C07C9/14—Aliphatic saturated hydrocarbons with five to fifteen carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G25/00—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents
    • C10G25/02—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents with ion-exchange material
    • C10G25/03—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents with ion-exchange material with crystalline alumino-silicates, e.g. molecular sieves

Definitions

  • zeolites have the property of preferentially absorbing certain types of hydrocarbons. These zeolites, known as molecular sieves, have crystalline structures containing a large number of pores of uniform size. In different zeolites, these pores may vary from 4 A. to 15 A. or more in diameter, but in any one zeolite the pores will he of substantially uniform size.
  • a process for separating straight-chain hydrocarbons from petroleum fractions boiling above C and containing molecular sieve deactivating hydrocarbons comprises fractionating the feedstock to obtain a lower-boiling fraction substantially free of deactivating hydrocarbons and a higher-boiling fraction containing substantially all the deactivating hydrocarbons and treating each fraction with a 5 A. molecular sieve in separate systems to extract straight-chain hydrocarbons.
  • the feedstock is fractionated at a point within the range 220 to 300 C., and particularly just below the initial boiling point of n-C hydrocarbons, i.e. in the region of 300 C.
  • the Regeneration may be carried out in the conventional manner by contacting the deactivated sieve with an oxygen-containing gas under controlled conditions to burn off the deactivating material.
  • a further advantage of operating according to the present invention is the increase in yield obtained. This is due partly to the fact that the sieve used for treating the lower-boiling fraction is not deactivated to any great extent and, in addition, to the fact that the sieve has a higher initial capacity when treating the lower-boiling fraction than when treating either the heavier fraction or the unfractionated distillate.
  • the method of the present invention may be employed to treat any hydrocarbon feedstocks which contain deactivating hydrocarbons and any appropriate molecular sieve treatments may be used to treat the fractions separated.
  • a particularly suitable molecular sieve treatment for hydrocarbon feedstocks boiling in C C range is described in our co-pending U.K. application No. 3,965 61. This process is isothermal and comprises contacting the fraction with a 5 A.
  • molecular sieve in a first stage to absorb straight-chain hydrocarbons, contacting the sieve with a purging medium in a second stage to remove material absorbed on the surface of the sieve or held interstitially between sieve particles, desorbing the absorbed hydrocarbons in a third stage using either n-pentane or n-butane as deso-rbing medium, all three stages being in the vapour phase, the pressure in the desorption stage being equal to, or greater than, the pressure in the absorption stage, and recovering the desorbed straight-chain hydrocarbons in a purity of at least weight.
  • Preferred process conditions include a temperature within the range 300-450 C., preferably 350-390 C., and a pressure within the range 0-300 p.s.i.g. preferably -150 p.s.i.g.
  • preferred conditions for treating the lower boiling fraction are 380 C. and p.s.i.g. and for treating the higher boiling fraction 380 C. and 125 p.s.i.g.
  • a process for separating straight-chain hydrocarbons from petroleum fractions boiling above C and containing molecular sieve deactivating hydrocarbons comprising fractionating the feedstock at a temperature within the range of 220-300 C. to obtain a lower-boiling fraction substantially free of deactivating hydrocarbons and a higher-boiling fraction containing substantially all the deactivating hydrocarbons and treating each fraction with a 5 A. molecular sieve in separate systems to extract straight-chain hydrocarbons.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
US275128A 1962-05-02 1963-04-23 Separation processes using molecular sieves Expired - Lifetime US3274100A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB16827/62A GB988542A (en) 1962-05-02 1962-05-02 Improvements relating to hydrocarbon separation processes using molecular sieves

Publications (1)

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US3274100A true US3274100A (en) 1966-09-20

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US275128A Expired - Lifetime US3274100A (en) 1962-05-02 1963-04-23 Separation processes using molecular sieves

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US (1) US3274100A (de)
BE (1) BE631741A (de)
FR (1) FR1356576A (de)
GB (1) GB988542A (de)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935467A (en) * 1956-07-27 1960-05-03 Union Oil Co Fractionation process using zeolitic molecular sieves

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2935467A (en) * 1956-07-27 1960-05-03 Union Oil Co Fractionation process using zeolitic molecular sieves

Also Published As

Publication number Publication date
GB988542A (en) 1965-04-07
DE1470498A1 (de) 1968-12-12
BE631741A (de)
FR1356576A (fr) 1964-03-27

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