Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1982-01-25
1983-08-30
Cintins, Ivars C.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210693, 210924, C02F 140
Patent
active
044015712
DESCRIPTION:
BRIEF SUMMARY
The removal of organic substances floating on water, particularly crude oil on sea water, is of worldwide importance for purposes of environmental protection. Many proposals have already been made to solve this problem.
In German Pat. No. 1,953,587, it has been proposed, for example, to catch foreign bodies floating on a water surface with a flexible barrier. U.S. Pat. No. 3,607,741 describes the use of hydrophobic and oil-resistant impregnated cellulose for absorbing oil. German Pat. Nos. 2,417,431, 2,520,999 and 2,654,909 disclose the removal of oil from water by the action of oil-decomposing microbes. In German Pat. Nos. 2,802,673 and 2,806,851, it has been proposed to bind the oil with organic or inorganic powders having large surface areas. It has also become known from French Pat. No. 1,523,828 to remove organic liquids from their mixtures with water by treating them with solid, particulate adsorption media for the organic liquids. These adsorption media consist especially of crosslinked vinyl polymers, the chemical composition of the polymers and especially their degree of crosslinking determining the extent of their adsorption capacity.
According to French Pat. No. 2,103,217, a compound which polymerizes under the action of water is applied to the liquid floating on water and this compound forms a solid structure after polymerization, which envelops the organic liquid and may be removed therewith from the water. The proposed polymerizable compound is 2-cyano acrylate.
According to German Pat. No. 1,944,636, a mixture of foamed flakes of polystyrene and polyurethane or condensation polymerized resins are applied to the water surface carrying a layer of oil. The flake mixture adsorbs the oil, the polystyrene foam selectively adsorbing the high molecular oils and the polyurethane foam the lighter, volatile substances, such as gasoline, for example.
Finally, it is known from British Pat. No. 1,170,959 to prepare a synthetic resin foam in situ on or below the surface to be cleaned to adsorb the oil layer. Only polyurethane is mentioned as a useful synthetic resin for this purpose.
All of these methods have the disadvantages that, for economic reasons, they are practically not applicable on a large scale or are only insufficiently effective.
These disadvantages have been overcome by the method of this invention. The invention relates to a method for removing a liquid floating on water, for example oil, particularly crude oil on sea water, by forming a water-resistant synthetic resin foam in situ in the range of the water surface to be cleaned.
This method is characterized according to the invention by curing a mixture containing a solvent-free liquid epoxy resin, 5-15%, by weight, based on the epoxy resin, of a resin improving agent on the basis of an alkyl phenol and a biphenol as well as a methylalkyl keton, and 20-30%, by weight, based on the curing agent, of an foaming agent and an accelerator with a di- or polyamine curing agent around the liquid to be removed or, optionally, in the middle thereof.
It is preferred to use about 7%, by weight, of the resin improving agent and about 25%, by weight, of the foaming agent and accelerator. It is also advantageous to add about 10 to 100, especially 10-20%, by weight, based on the epoxy resin, of an additive to the mixture.
Ethylene diamine, diethylene triamine, dipropylene triamine or triethylene tetramine are the preferred di- or polyamines.
According to a preferred embodiment of the invention, the curing of the mixture with the di- or polyamine is effected in the presence of stoichiometric amounts of polybutadiene and/or mixed polymers of butadiene and styrene.
The foam ring formed of these components absorbs the oil. Optionally, additional foam is formed in the middle of the liquid to be removed if the foam ring formed around the liquid has not fully absorbed the entire liquid. For example, if large oil slicks are formed as a result of a tanker accident, the oil slick may first be surrounded by a foamed substance and any residual oil remaining in the mid
REFERENCES:
patent: 3676357 (1972-07-01), Ciuti et al.
patent: 3816359 (1974-06-01), Creamer
patent: 3819514 (1974-06-01), Clampitt et al.
Cintins Ivars C.
Kelman Kurt
LandOfFree
Method for removing liquids floating on water does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for removing liquids floating on water, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for removing liquids floating on water will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-905092