Classifications

• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
  • C10L1/00—Liquid carbonaceous fuels
  • C10L1/04—Liquid carbonaceous fuels essentially based on blends of hydrocarbons

Definitions

• Fuel oils may be prepared from high viscosity vacuum residues by blending the residue with a low viscosity diluent, or cutter .stock, such as gas-oil, the proportion of diluent depending upon the duel oil viscosity required.
• Vacuum residues from a large variety of crudes which do not contain excessive quantities of wax when prepared by normal refinery practice have an equivalent cut point of less than 550 C. corrected to 760 mm. Hg.
• these residues when blended with the necessary amount of gas-oil to give the required viscosity yield a fuel oil having a pour point below the specified maximum of 70 F.
• Waxy crude means a crude oil which contains wax in an amount such that, when conventionally distilled in refinery distillation units to an equivalent cut-point of less than 550 C. corrected to 760 mm. Hg, it gives a vacuum residue having so high a wax content that it cannot be blended with gas oil to give a blend having a viscosity above 40 cs. at 75 C. (1000 Redwood 1 seconds at 100 F.) as well as a pour point below 70 F.
• a process for the 3,303,128 Patented Feb. 7, 1967 production of a fuel oil having a viscosity within the range 40 to 90 cs. at C. and a maximum pour point of 70 F. from a Waxy crude comprises vacuum distilling the waxy crude to obtain a final vacuum residue boiling above 550 C. at a pressure corrected to 760 mm. Hg and blending this heavy residue with gas-oil to give both the required viscosity within the range 40 to cs. at 75 C. and a pour point below 70 F.
• the cut-point of the residue is preferably as close to 550 C. as is possible consistent with giving a residue which can be blended to give fuel oils of the required specification.
• the maximum cutpoint temperature is below that at which cracking of the feedstock commences. This point will vary from crude to crude but is readily determinable by experiment, for example, for a Nigerian crude the maximum cut-point obtainable without cracking is 595 C. and with a Malawin crude the maximum cut-point is 620 C.
• Example Vacuum residues were obtained with cut-points in the range equivalent to 550 to 595 C. at atmospheric pressure by redistilling, at 0.2 mm. Hg pressure, a longer residue obtained from Nigerian crude oil. Vacuum residues were also obtained with cut-points in the range 550 to 620 C. by distilling, at 0.2 mm. Hg, a residue prepared by laboratory batch distillation of a Haitin crude oil. Inspection data on these residues and on a typical catalytically cracked gas-oil cutter stock are given in the following Table 1. Inspection data on blends of these residues with various proportions of this gas-oil cutter stock are given in the following Table 2.
• C. cutter stock 100 F. (Calculated F percent wt. 170 F 210 F. (Extrapolated) from kinematic viscosities) Nigerian 550 67 62. 26. 7 560 2, 300 75 61 37. 8 17. 8 280 1, 140 55 Malawin 550 71 101. 4 44. 2 820 3, 300 90 66 63. 7 31. 8 360 1, 470 70 62 47. 0 23. 9 260 1, 060 65 Do ca. 620 61 91. 2 41.8 0 650 50 51 44. 7 23. 4 22 900 45 We claim: 25 quired viscosity Within the range 40 to 90 cs. at 75 C.

Landscapes

• 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)
• Lubricants (AREA)
• Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

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Publications (1)

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Cited By (4)

Citations (2)

• 0
  • BE BE650636D patent/BE650636A/xx unknown
• 1963
  • 1963-07-16 GB GB28104/63A patent/GB996817A/en not_active Expired
• 1964
  • 1964-06-18 US US376221A patent/US3303128A/en not_active Expired - Lifetime
  • 1964-07-15 DE DEB77685A patent/DE1260661B/de active Pending

Patent Citations (2)

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