• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The present invention relates to the replacement of water and glycol mixtures with synthetically produced diesel as the cooling medium, for example coolant in vehicles. The synthetic synthetic diesel is environmentally friendly, can be used in a wide temperature range, acts as a rust protection in radiator systems and transports heat better than water does.
    公开号:SE1050518A1
    申请号:SE1050518
    申请日:2010-05-25
    公开日:2011-11-26
    发明作者:Mats Arrhenborg；Stefan Lindstroem
    申请人:Ec1 Invent Ab；
    IPC主号:
    专利说明:

    2 It has been reported that during World War II, the German army used diesel oil as a coolant to prevent the coolant from freezing at low temperatures. However, the diesel oil had problems with it destroying gaskets etc. in the cooling system and caused problems with corrosion in the system due to moisture and dirt mixing with the diesel oil, which made it acidic.
    Summary The object of the present invention is to find a heat exchange medium, such as a cooling medium, which can replace water and its mixtures with glycol for cooling, for example, engines.
    This is achieved with the refrigerant according to claim 1. Preferred embodiments are set out in the dependent claims. The object is also achieved by using a synthetic diesel according to claim 6 and a heat exchange system according to claim 9.
    In accordance with the present invention, water and glycol are replaced by a synthetically produced diesel. The diesel used must be substantially free of polycyclic alkanes and aromatics. The synthetic diesel thus has a composition comprising non-cyclic alkanes in a content of at least 50%, optionally up to 50% of alkylated monocyclic alkanes, maximum 1% aromatics and maximum 1% of di- and polycyclic alkanes. All percentages are given in weight percent. This synthetic diesel is in itself previously known for use as a fuel for diesel engines in various vehicles, especially vehicles in environments where it is important to minimize exhaust gases, such as in mines and warehouses.
    In accordance with one embodiment of the invention, the synthetic diesel comprises at least 65% non-cyclic alkanes. Preferably it contains at least 70% non-cyclic alkanes. Since diesel is not to be combusted, it does not need to contain energy-boosting compounds, such as alkylated monocyclic alkanes. It is rather advantageous to minimize the content of these in order to further reduce the flammability of the diesel. According to a preferred embodiment, therefore, the content of alkylated monocyclic alkanes is preferably a maximum of 25%, nor a maximum of 10%. In accordance with a further embodiment of the invention, the synthetic diesel comprises a maximum of 0.5% aromatics and / or a maximum of 0.5% polycyclic alkanes.
    The synthetic diesel is non-flammable. However, it is possible to add a flame retardant additive if desired, as it is to be used as a heat exchange medium such as a cooling medium. Examples of fire-retardant additives are boric acid and boric salt.
    It is also possible to add a dye to the heat exchange medium in order to be able to easily distinguish it from other liquids. For example, when the heat exchange medium is a coolant for vehicles, it can be assigned a color that differs from, for example, washer fluid, other types of coolant, etc. to avoid confusion with these liquids.
    Detailed Description The present invention is based on the discovery that it is possible to replace water and glycol mixtures with a pure synthetic diesel as the cooling medium and thereby enable cooling within a larger temperature range, and to overcome the problem that glycol is toxic.
    Conventional diesel, produced for example from petroleum, contains a variety of residues. It is these residues that make diesel environmentally hazardous and that diesel can risk destroying entire ecosystems, e.g. in seas or lakes. Although conventional diesel could act as a refrigerant, it is not directly suitable for a number of reasons. Firstly, conventional diesel is not environmentally friendly and thus entails an increased environmental risk. In addition, the conventional diesel can risk being split if water and dirt enter, thereby causing corrosion in the cooling system. It also contains volatile hydrocarbons, which can pose a health risk. Furthermore, in some cases it can risk being ignited in the event of, for example, a collision with a vehicle.
    In accordance with the present invention, therefore, a synthetically produced diesel is used, which is substantially free of the pollutants which can make the diesel environmentally hazardous 4 and make it risk of being ignited. It is an essential part of the invention that the diesel is substantially pure, in order for it to be suitable as a cooling medium or other type of heat exchange medium.
    The synthetic diesel has a much higher boiling point than mixtures of water and glycol, more specifically at least above 200 ° C, and can therefore be used at a much higher temperature than water with glycol. In addition, its freezing point is about -40 ° C, which means that it can also be used in very cold climates. The synthetic diesel thus enables use in a wider temperature range than water and glycol mixtures. The synthetic diesel, for example, works very well as a coolant in vehicles that operate at high temperatures, for example on very hot days and during exposure to the sun.
    Furthermore, the synthetic diesel is very difficult to ignite, and can therefore easily replace various water mixtures in the cooling system of vehicles without risking fire or explosion in the event of a collision or the like.
    The synthetic diesel also has the ability to reduce corrosion, for example in cooling ducts in engines and heating systems, and has a lubricating effect on the pump that is to pump around the coolant. This in turn gives an extended service life of other parts of cooling and heating systems.
    In addition, the synthetic diesel does not evaporate and therefore does not need to be refilled in a heat transfer system such as a radiator on a vehicle in the same way as for conventional coolants. It is also not toxic or otherwise dangerous to the environment or the user, unlike for example glycol.
    Furthermore, the synthetic diesel has better heat transfer capacity than water, which enables more efficient heat transfer systems.
    The synthetic diesel can be easily produced using conventional processes, such as the Fischer-Tropsch process, either from biomass or from gas. It is also conceivable that the synthetic diesel can be produced from coal. Using the Fischer-Tropsch process, it is possible to produce synthetic diesel which is essentially free of aromatics, polyaromatics (PAH) and sulfur, and is thus very pure. Due to the very low levels of residues, the synthetic diesel is no less toxic and is even biodegradable. Furthermore, the synthetic diesel is very flammable and basically odorless.
    The synthetic diesel is particularly suitable for use as a heat exchange medium in heat exchange systems, i.e. the medium that transfers heat or cold to another medium. It is also suitable as a cooling medium, especially as a replacement in systems that currently use water and glycol mixtures. A specific example of a suitable area of use is as coolant in vehicles, such as cars, boats, tractors, trucks, buses, etc. |.
    The use of the synthetic diesel in cooling systems for diesel engines is particularly advantageous, since the synthetic diesel has a lubricating effect of the cooling system.
    In addition, the risk of significant damage due to leakage of fuel to the cooling system is eliminated, which can have devastating effects when water and glycol are used as cooling medium. When using a synthetic diesel as coolant, however, there is no risk of damage due to leakage of fuel into the system, as the coolant and the fuel are compatible with each other. Furthermore, a possible leakage of coolant to the engine lubrication system does not pose a risk of damage, as the coolant is compatible with other media in the lubrication system. Because the diesel is so clean, it also does not risk corroding gaskets and the like in the cooling system. Although the present invention has been mainly described with reference to cooling of engines in vehicles, it should be noted that the invention is not limited to this application. It is also possible to use it as a coolant for all types of engines that are currently water-cooled. It is also conceivable to use as a heat exchange medium heating and cooling systems in houses and industries. The synthetic diesel is also conceivable to be used as a cooling medium for cooling tools, such as cutters, drills, lathes, etc.
    权利要求:
    Claims (1)
    [1]
    1. Cooling medium is characterized in that it consists essentially of a synthetic diesel comprising non-cyclic alkanes in a content of at least 50%, optionally up to 50% of alkylated monocyclic alkanes, max. and a maximum of 1% of di- and polycyclic alkanes. Coolant according to Claim 1, characterized in that the synthetic diesel contains at least 65% of non-cyclic alkanes, preferably at least 70% of non-cyclic alkanes. Refrigerant according to Claim 1 or 2, characterized in that the synthetic diesel contains a maximum of 0.5% of aromatics. Coolant according to one of the preceding claims, characterized in that the synthetic diesel contains a maximum of 0.5% of polycyclic alkanes. Refrigerant according to any one of the preceding claims, characterized in that it also contains a flame retardant additive. Use of a synthetic diesel comprising non-cyclic alkanes in a content of at least 50%, optionally up to 50% of alkylated monocyclic alkanes, maximum 1% aromatics and maximum 1% of di- and polycyclic alkanes, as heat exchange medium. Use of a synthetic diesel according to claim 6, wherein the heat exchange medium is a cooling medium. Use of a synthetic diesel according to any one of claims 6 and 7 as coolant in vehicles. Heat exchange system comprising a device for heat exchange, said device adapted to contain a liquid medium for heat exchange characterized in that said medium for heat exchange is a synthetic diesel comprising non-cyclic alkanes in a content of at least 7 50%, optionally up to 50% of alkylated monocyclic alkanes, maximum 1% aromatics and maximum 1% of di- and polycyclic alkanes.
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    法律状态:
    2018-01-30| CANC| Patent cancelled, revoked after opposition|
    2019-01-02| NUG| Patent has lapsed|
    优先权:
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