Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Patent
1992-02-12
1994-02-22
Cintins, Marianne M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
570211, 570238, 570262, C07C 1738
Patent
active
052889297
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a method for driving off and collecting propellants, e.g. chlorofluoro-carbons (CFCs) from foam materials, e.g. insulating foam in refrigerators, freezers, district heating tubes, etc, which method involves the use of a closed container in which a mechanical decomposition of the product is effected.
By other prior art techniques it is only possible to destroy these foam products in such a manner that the propellants are liberated and either escape into the atmosphere thus charging the environment and/or are being decomposed to highly poisonous products.
From DE-A-3,830,118 a method is described by which the liberation of the propellants is effected in a closed chamber defined by a cylinder and two pistons. However, such chamber would be inconvenient as it is difficult to provide sealings by which any escape of propellants into the atmosphere is obviated.
It is the object of the invention to remedy the above drawbacks and to provide an environmentally friendly method for driving off and collecting propellants, e.g. CFCs from foam material. This object is achieved with a method being characterized in that the mechanical decomposition of the product and the liberation of the propellant is effected inside a cup-shaped process container having the closed part of the cup turned upwardly and the open part of the cup placed below the surface of a liquid medium, e.g. water, under/in which liquid medium the decomposition and liberation is effected.
If foam products are decomposed mechanically (crushed) without being surrounded by a liquid medium it is difficult to condense the propellants sufficiently as the propellant gases are mixed with large amounts of air which impedes an efficient condensing of the propellants.
Accordingly, these materials are being deposited for being removed/destroyed at a later time when a suitable method has been developed.
Herein, the term "process container" refers to, e.g. the part of the equipment which comprises the cup-shaped process vessel in which the mechanical decomposition and optional condensing takes place, and the part of the equipment which is necessary for collecting the propellant gases and non-condensable gases.
The method is based on the fact that the mechanical decomposition of the foam material which may be attached to one or more solid sides, e.g. a side plate of a refrigerator takes place in such a manner that the propellant does not escape into the atmosphere, as the foam material together with the propellants during the decomposition process and the liberation process, is surrounded/confined and thus in contact with a liquid medium, e.g. water.
In the present specification, the term "process container" is used describing the part of the equipment which e.g. contains of: A cup-shaped process vessel in which the mechanical decomposition and an optional condensing takes place and the part of the equipment which is necessary for the collecting of the propellant gases and non-condensable gases.
The method is based on the fact that the mechanical decomposition of the foam material which may be attached to one or more solid sides, e.g. a side plate of a refrigerator takes place in such a manner that the propellant does not escape into the atmosphere, as the foam material together with the propellants during the decomposition process and the liberation process, is surrounded/confined and thus in contact with a liquid medium, e.g. water.
By decomposing the foam material in a liquid medium having a temperature equal to or above the temperature corresponding to the boiling point of the propellant at the actual pressure, the propellant present in the structure (cells) of the foam material is liberated from the foam product.
This liberation of the propellant causes that the propellant contacts the liquid medium thereby ensuring that due to the temperature of the liquid medium, the propellant is liberated from the foam product as a gas, ascends as a gas, breaks the surface of the liquid medium and is collected under the top o
REFERENCES:
patent: 5175381 (1992-12-01), Hoberg et al.
Cintins Marianne M.
L&E Holding ApS
Peabody John
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