US3260667A - Separation processes using molecular sieves - Google Patents

Separation processes using molecular sieves Download PDF

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Publication number
US3260667A
US3260667A US287718A US28771863A US3260667A US 3260667 A US3260667 A US 3260667A US 287718 A US287718 A US 287718A US 28771863 A US28771863 A US 28771863A US 3260667 A US3260667 A US 3260667A
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hydrocarbons
boiling
fraction
range
deactivating
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US287718A
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Yeo Alan Arthur
Mowell Roger Templeton Lewis
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BP PLC
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BP PLC
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    • 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

  • This invention relates to separation processes using molecular sieves and particularly to processes for the separation of straight-chain hydrocarbons from petroleum fractions.
  • 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 be 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 at least one higherboiling fraction containing deactivating hydrocarbons and treating each fraction successively, inascending order of boiling range, with a 5 A. molecular sieve 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 initial sieve capacity and the deactivation rate of the sieve are substantially independent of the amount of lower-boiling hydrocarbons in the feed so that the initial capacity and the deactivation rate are the same when treating a higher-boiling fraction containing all the deactivating hydrocarbons as when treating the unfractionated feedstock.
  • the method of the present invention may be employed to treat any hydrocarbon feedstocks, which contain deactivating hydrocarbons, for example boiling up to C or higher, and any appropriate molecular sieve treatment may be used.
  • a particularly suitable molecular sieve treatment for hydrocarbon feedstocks boiling in the C -C range is described in our copending 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 adsorbed 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 desorbing 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 350390 C., and a pressure within the range 0300 p.s.i.g., preferably -150 p.s.i.g.
  • a 180-340 C. petroleum distillate was fractionated to give a 180-265 C. fraction containing 0.01% weight of sulphur and a 220-340 C. fraction containing 0.025% weight of sulphur.
  • First the lighter fraction and then the heavier fraction was treated for the recovery of n-paraffins in a bed comprising 2600 grams of 5 A. molecular sieve in a three stage cyclic system under the conditions set out in the following table:
  • a process for separating with a high recovery yield of straight-chain hydrocarbons from petroleum fractions boiling in the C -C range and containing molecular sieve deactivating hydrocarbons comprising fractionating at a temperature Within the range 220300 C. the feedstock to obtain a lower-boiling fraction substantially free of deactivating hydrocarbons and at least one higherboiling fraction containing deactivating hydrocarbons and treating each fraction successively, in ascending order of boiling range, with a 5 A. molecular sieve to extract straight-chain hydrocarbons.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
US287718A 1962-06-14 1963-06-13 Separation processes using molecular sieves Expired - Lifetime US3260667A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB22894/62A GB991041A (en) 1962-06-14 1962-06-14 Improvements relating to hydrocarbon separation processes using molecular sieves

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US3260667A true US3260667A (en) 1966-07-12

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BE (1) BE633669A (it)
GB (1) GB991041A (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3409544A (en) * 1966-09-15 1968-11-05 Phillips Petroleum Co Hydrocarbon separation using two adsorption zones

Citations (3)

* 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
US2987471A (en) * 1956-11-19 1961-06-06 Shell Oil Co Separation of hydrocarbons
US3160581A (en) * 1956-02-13 1964-12-08 Exxon Research Engineering Co Hydrocarbon desorption process

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3160581A (en) * 1956-02-13 1964-12-08 Exxon Research Engineering Co Hydrocarbon desorption process
US2935467A (en) * 1956-07-27 1960-05-03 Union Oil Co Fractionation process using zeolitic molecular sieves
US2987471A (en) * 1956-11-19 1961-06-06 Shell Oil Co Separation of hydrocarbons

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3409544A (en) * 1966-09-15 1968-11-05 Phillips Petroleum Co Hydrocarbon separation using two adsorption zones

Also Published As

Publication number Publication date
BE633669A (it)
DE1470500A1 (de) 1968-12-19
GB991041A (en) 1965-05-05

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