Classifications

• • 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
  • C10G73/00—Recovery or refining of mineral waxes, e.g. montan wax
  • C10G73/02—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils
  • C10G73/24—Recovery of petroleum waxes from hydrocarbon oils; Dewaxing of hydrocarbon oils by formation of adducts
• • 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
  • C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
  • C10G2300/40—Characteristics of the process deviating from typical ways of processing
  • C10G2300/44—Solvents

Definitions

• H ai o g e n hydrocarbons, aromatics, naphthenes, branched hydrocarbons and also straight-chain hydrocarbons Which do not combine with urea under the conditions of the adduct formation.
• the adduct retains relatively large amounts of the oil solvent.
• these quantities of oil solvent are found again chiefly in the n-paraffine layer. They must be recovered from this layer, the quantities of the oil solvent being always quite large, between 30 and 50% by weight relative to the adduct.
• they are at the upper limiting value, i.e. at about 50% by weight; in the case of filtration under the influence of vacuum or pressure or by means of a centrifuge, they are at the lower limit, i.e. at about 30% by weight. The cost of recovering these quantities is therefore rather large.
• the concentration of the urea solution is without practical importance in such case. It is suitable to use a urea solution which is saturated at the temperature at which the washing is undertaken.
• This washing temperature in general lies at room temperature. Since the adduct-forming temperature can also rise with a rise in the carbon number of the n-paraffines, it is conceivable that there are also cases in which the washing of the adduct can be undertaken at a temperature higher than 20 C. However, due to the presence of the aqueous urea solution, 80 C. cannot be exceeded, because urea begins to decompose noticeably at 80 C. in the presence of Water.
• the quantity of urea solution used to displace the oil solvent is in general small. It suifices to use only enough urea solution to exactly displace the oil solvent. case the filtrate consists only of oil solvent, while the urea solution remains completely in the adduct. However, it is also possible to use greater quantities of urea solution.
• the filtrate which in this case consists of urea solution and oil solvent, is easy to separate because of the separated layers present. The oil solvent can be re-used in the cycle.
• the oil solvent content is substantially reduced, i.e. to about 5% by weight relative to the adduct, and this is independent of the preceding filtration.
• This mass of oil solvent is composed firstly of solvent to be used for washing the adduct and only secondarily of solvent still adhering to the adduct after formation of the adduct.
• the methylene chloride was replaced in the adduct until 7% by weight remained.
• the urea solution was so apportioned that it remained completely in the adduct and the filtrate consisted only of methylene chloride.
• Example 2 300 grains of the same adduct as in Example 1 was filtered in a suction filter under a vacuum of 15-20 mm. of mercury at C.
• the sieved product was in a layer 15 cm. high and had a methylene chloride content of 32% by weight.
• This mass or" oil solvent is composed firstly of solvent to be used for washing the adduct and only secondarily of solvent still adhering to the adduct after formation of the adduct. It was washed at 20 C. with grams of a urea solution saturated at 35 C. The con- In this tent of methylene chloride diminished to 5% by weight.
• the filtrate consisted of methylene chloride.
• Example 3 300 grams of the adduct mentioned in Example 1 was filtered at 40 C. in a filtering centrifuge (speed: 10,000 r.p.rn.). The methylene chloride content was 31% by weight. This mass of oil solvent is composed firstly of solvent to be used for washing the adduct and only seeondarily of solvent still adhering to the adduct after formation of the adduct. At 20 C. this amount of methylene chloride was largely replaced by 80 grams of a urea solution saturated at 35 C. The methylene chloride content diminished to 5% by weight in the sieved product; the filtrate consisted only of methylene chloride.
• Example 4 200 grams of an adduct (grain diameter 0.1 mm.), which was obtained by treating with urea a petrolatum (solidification point 71 0., oil content 3.65% by Weight), completely dissolved in ethylene chloride-1,2, was filtered through a sieve with a mesh width of 0.075 mm. (about equivalent to a 200 mesh Tyler sieve) at 60 C. The sieved product was in a layer 35 cm. deep and had a content of ethylene chloride-1,2 of 48% by weight.
• This mass of oil solvent is composed firstly of solvent to be used for Washing the adduct and only secondarily of solvent still adhering to the adduct after formation of the adduct.
• t was washed at 50 C. with 70 grams of a urea solution saturated at 60 C.
• the content of ethylene chloride-1,2 was about 6% by Weight.
• the filtrate consisted only of ethylene chloride-1,2.

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

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Citations (5)

• 1960
  • 1960-01-30 DE DEE18822A patent/DE1094390B/de active Pending
• 1961
  • 1961-01-19 US US8362861 patent/US3117923A/en not_active Expired - Lifetime
  • 1961-01-23 NL NL260355D patent/NL260355A/xx unknown
  • 1961-01-23 NL NL260355A patent/NL121842C/xx active
  • 1961-01-28 FR FR851037A patent/FR1278503A/fr not_active Expired
  • 1961-01-30 GB GB3511/61A patent/GB945814A/en not_active Expired

Patent Citations (5)

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