Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B1/00—Production of fats or fatty oils from raw materials
  • C11B1/12—Production of fats or fatty oils from raw materials by melting out
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B13/00—Recovery of fats, fatty oils or fatty acids from waste materials
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes

Definitions

• the present invention relates to a method for ex- tracting oil from fish offal, comprising the step of heating the offal to a temperature above +30°C while keeping the offal in a liquid-permeable container from which oil extracted from the offal by heating is sepa ⁇ rated by dripping off, the rest of the offal remaining in the container.
• the invention aims at providing an easily practicable method for extraction, which allows cost-effective use of fish offal while yielding high-quality oil.
• This object is achieved by a method which is characterised in that the fish offal in an initial step, before being heated to the temperature stated by way of introduction, is deep-frozen, i.e. frozen to a temperature below -18°C, and thereafter thawed from the deep-frozen state.
• the deep ⁇ freezing temperature is kept between -20°C and -30°C.
• the fish offal is stored in its deep-frozen state, preferably for at least one day, and suitably for a longer period, e.g. 2-4 days. Then, the material is placed in an environment having a temperature of above +5°C so as to thaw, whereupon it is heated to a temperature exceeding +30°C, preferably a temperature of between +40°C and +50°C, at which it is kept for at least one hour. Advan- tageously, this heating can be carried out at such a rate that the temperature increases by about 5-30°C/hour.
• the fish offal is kept in a first, liquid-permeable container, for example a string bag con ⁇ sisting of a fine-meshed net or a vessel with a straining cloth, which itself is disposed inside or above a second, liquid-impermeable container.
• a fat-containing liquid in the form of oil will gradually be extracted from the heated material and allowed to drip off from the first, liquid-permeable container into the second container for collection of the liquid.
• the amount of oil or oily liquid obtained by the method may be up to 70-80% of the weight of the fish offal in solid form.
• the resulting oil has low viscosity (about the same viscosity as sewing-machine oil) and high storage _l stability, so that its properties will not change. If 5 blood-containing matter, such as heart and liver, are removed from the starting material, i.e. the fish offal, the resulting oil will be clear and of a pale yellow, but with an increasing amount of blood-containing matter in the offal, the red-colouring of the oil is intensified.
• the resulting oil contains many useful substances, such as unsaturated fatty acids, for which reason it can be used in a number of technical fields, e.g. as raw mate ⁇ rial for the production of foodstuffs, medicines, cosme ⁇ tics, lubricants and fuels.
• Vitamin A mg/kg 10.0

Landscapes

• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Organic Chemistry (AREA)
• Fats And Perfumes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20374812

Family Applications (1)

Country Status (5)

Families Citing this family (3)

Family Cites Families (2)

• 1989
  • 1989-01-20 SE SE8900206A patent/SE463315B/sv not_active IP Right Cessation
• 1990
  • 1990-01-05 WO PCT/SE1990/000012 patent/WO1990008179A1/en not_active Ceased
  • 1990-01-05 AU AU49543/90A patent/AU4954390A/en not_active Abandoned
  • 1990-01-05 FI FI913499A patent/FI913499A0/fi not_active Application Discontinuation
  • 1990-01-05 EP EP90902407A patent/EP0454755A1/de not_active Withdrawn

Non-Patent Citations (1)

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