JPS5939381A - Removal or recovery of oil - Google Patents

Abstract

PURPOSE:To enable to absorb oil not only floating on the surface of the water but also existent below the surface of the water, by adding slurry matter obtd. by dispersing a powdery norbornene polymer in alcohol-contg. water to the oil floating on the surface of the water or sea water. CONSTITUTION:Slurry matter obtd. by dispersing a powdery norbornene polymer such as an open-ring polymer of bicyclo(2,2,1)heptene-2 in alcohol-contg. water is added to oil floating on the surface of the water or sea water. The thin film of the norbornene polymer which has absorbed the oil, swollen and gelled into a gelatinous state has sufficient strength without being crushed into fine pieces by the action of waves. Hence, it is recovered by an ordinary recovering method by using a net or a suction pump. Since this method uses the slurry oil absorbent, its treatment is easy. The oil on and below the surface of the water is absorbed and formed into the gelatinous state to alleviate the malignancy of the oil and to facilitate the removal of the oil from the water or sea water.

Description

[Detailed Description of the Invention] The present invention relates to a method for treating waste oil, waste oil, etc.
More specifically, the present invention relates to an oil removal or recovery method in which a slurry obtained by dispersing a powdered norbornene polymer in water containing alcohol is added to oil floating on the surface of water or seawater.

When norbornene polymer powder comes into contact with various oils, it easily absorbs oil and forms an agar-like (gel-like) thin film. Furthermore, since this thin film has sufficient strength, it has the characteristic that various recovery methods can be used.

Conventionally, utilizing the above-mentioned properties of norbornene-based polymer powder, norbornene-based polymer powder has been directly applied to surfaces where oil is floating, for the purpose of absorbing and removing waste oil and waste oil from the surface of water, seawater, etc. A method has been proposed for spraying on the soil (Japanese Patent Application No. 50-128263). However, although the polymer is lighter than water or seawater and floats on the water surface, it does not disperse in water or seawater, so it absorbs oil on the surface of water or seawater, but absorbs oil dispersed in water or seawater. As a result, the oil absorption efficiency is poor, which is not completely satisfactory.

The present inventors have arrived at the present invention as a result of repeated studies to improve the above-mentioned drawbacks. An object of the present invention is to provide an oil removal or recovery method that is easy to handle and has improved oil absorption efficiency. This is achieved by adding the same to water or oil floating on the surface of seawater. Since the method of the present invention can absorb not only oil above the water surface but also below the water surface (dispersed in water), it is an oil removal or recovery method with excellent oil absorption efficiency.

The norbornene polymer used in the present invention easily absorbs large amounts of solvents (toluene, benzene, xylene, etc.) and various oils (A-C heavy oil, spindle oil, machine oil, light oil, kerosene, gasoline, etc.) even at room temperature. It is a ring-opening polymer or copolymer of bicyclo(221)hebutene-2 or its derivatives, which has the property of becoming agar-like (gelling). This is a polymer obtained by Monomers used include bicyclo(ZZl)hebutene-2, methyl-5 to bicyclo(221)hebutene-2, ethyl-
Alkyl- such as 5-bicyclo(221)hebutene-2
5-bicyclo(2,21)hebutene-2 monomers, alkoxy-5-bicyclo(2,21)hebutene-2, methoxy-5-bicyclo(221)hebutene-2, ethoxy-5-bicyclo(221)hebutene-2, etc. 4211) hebutene-2 monomer,
Cyano-5-bicyclo(2,2,1)hebutene-2, bicyclo(22,1)hebutene-2-5 carboxylic acid ester monomer, bicyclo(ZZl)hebutene-2-5,
Examples include diester monomers of 6-dicarboxylic acids and mixtures thereof.

A typical polymer is bicyclo(2221)butene-
Polynorbornene, which is a ring-opened polymer of No. 2, is mentioned.

In order to achieve the object of the present invention, the norbornene-based polymer must be in powder form, and one that has been dried into powder form in a drying step after completion of polymerization is particularly suitable. Further, the particle size of the powder is particularly preferably about 0.01 to 1 mm.

The alcohols used in the present invention are not subject to any restrictions as long as norbornene polymer powder is dispersed in water to form a slurry, and include methyl alcohol, ethyl alcohol, flobyl alcohol, butyl alcohol, pentyl alcohol, hexyl Monohydric aliphatic saturated alcohols such as alcohol, monohydric aliphatic unsaturated alcohols such as allyl alcohol, monohydric cycloaliphatic alcohols such as cyclopentanol, monohydric aromatic alcohols such as benzyl alcohol, furfuryl Monohydric heterocyclic alcohols such as alcohol, dihydric alcohols such as glycol, trihydric alcohols such as glycerin, and sugar alcohols of tetrahydric or higher hydrity can be used alone or in combination, but the preferred alcohols are monohydric fats. It is a group saturated alcohol.

There is no restriction on the amount of alcohol added to water as long as the powdered norbornene polymer is dispersed in a slurry, but it is usually 1% by weight or more, preferably 5% by weight of the norbornene polymer used. It is more preferably 10 weight coefficient or more. There is no limit to the concentration of the polymer, and it can be determined as appropriate in consideration of the amount of oil, oil absorption efficiency, and ease of handling. Moreover, alcohols can be used in combination with surfactants.

The method for preparing the slurry of norbornene polymer powder of the present invention is not limited at all, and examples include a method of dissolving alcohol in water and adding powdered norbornene polymer to this aqueous solution to form a slurry with stirring; Examples include a method of spraying the polymer powder onto the polymer powder and then dispersing it in water to form a slurry, or a method of impregnating the polymer powder with an alcohol and dispersing it in water to form a slurry.

The method of the present invention can be carried out by spraying a slurry of norbornene-based polymer onto the surface of water or seawater in which oil is floating by an appropriate means and bringing it into contact with the oil (the method of spraying itself is not limited in any way,
Commonly used spraying methods, such as spraying from a nozzle under pressure, can be used.

The thin film of norbornene polymer, which absorbs oil, swells, and becomes an agar-like gel, has sufficient strength and does not break into pieces due to wave action, making it suitable for conventional collection methods such as net collection and suction pump collection. method. The method of the present invention uses an oil absorbent in the form of a slurry, so it is easy to handle, absorbs oil above and below the water surface, turns it into a gel, reduces the harmfulness of the oil, and removes oil from water, seawater, etc. It can be said to be an excellent method of absorbing oil that makes it easier to absorb oil.

The present invention will be specifically explained below using Examples.

Example Norbornene polymer powder (N0R8O manufactured by CdF, France)
REX, particle size 0.01-1 ru) 20, li'
Alcohols listed in Table 1 (-grade reagent manufactured by Wako Tsumugi Co., Ltd.)
8 g was added and after thorough stirring, the entire amount was dispersed in 1 oocc of water to prepare a slurry of the polymer.

In a 500 cc beaker, 2 oocc of water and an aromatic oil (Nippon Sunoil Co., Ltd. product 5undex 790, viscosity SUS/3s°C, 3500) 100. ! add i',
To this was added the entire amount of the above slurry or norbornene polymer powder 20II, and the mixture was stirred for 2 minutes.

Visually judge the oil absorption state after leaving it at room temperature for 24 hours.
The results listed in the table were obtained.

The results in Table 1 show that the method of the present invention absorbs almost all of the oil above and below the water surface, whereas the conventional method of adding norbornene polymer powder absorbs only the oil above the water surface.

The same experiment as above was conducted using B heavy oil as the oil, but the first
Exactly the same results as listed in the table were obtained.

Patent applicant: Nippon Zeo/Co., Ltd.

Claims (1)

[Claims] A method for removing or recovering oil, which comprises adding a slurry of powdered norbornene polymer dispersed in water containing alcohol to oil floating on the surface of water or seawater.