JPS5832648A - Oil water separating material - Google Patents

Abstract

PURPOSE:An oil water separating material, consisting of a water-insoluble highly water absorbing hydrogel and a water-insoluble base material as a moldability imparting agent, and capable of separating water from an oil containing various kinds of water very easily. CONSTITUTION:An oil water separating material consisting of a water-insoluble highly water absorbing hydrogel and a water-insoluble base material as a moldability imparting agent. Preferably, (A) a saponified copolymer consisting of (A) ethylene, (B) a vinyl ester and (C) an ethylenically unsaturated carboxylic acid or a derivative thereof as principal components at a molar ratio[(A): (B+C)]of (0:100)-(15:85) and[(B):(C)]of (20:80)-(80:20) or a polymer crosslinked with acrylic acid or acrylate essentially is used as the highly water absorbing hydrogel. The water-insoluble base material used as the moldaility imparting agent is a nonwoven fabric consisting of pulp, polyolefin, polyester or rayon, foamed product or paper.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil-water separation material consisting of a highly water-absorbent hydrogel and a water-insoluble base material as a shape-imparting material.

Conventionally known methods for drying gases or liquids containing a relatively small amount of water include a single distillation method, a method using a dehydrating agent such as silica gel or calcium chloride, and a method using a separation membrane.

On the other hand, it is possible to concentrate an aqueous emulsion or dispersion of an aqueous polymer solution, synthetic polymer or milk, or to separate and solidify water from an aqueous slurry of sludge, or to concentrate water dissolved or dispersed in oil. When drying water by separating, dehydrating, and concentrating water from a relatively large amount of water, such as separating water generated in a removal or condensation reaction system, use a method with low dehydration capacity such as the one described above. The use of dehydrating agents has limitations and is generally not a satisfactory method, as it requires a long time and a long time.For this reason, there is a strong demand for a preferred method that can be applied to systems containing relatively large amounts of water. Recently, a method of absorbing water using hydrogels made of polymeric substances has been proposed.

In particular, water absorption (water absorption amount), gel strength in water absorption state,
The use of water-insoluble, highly water-absorbent hydrogels made of synthetic polymers containing hydroxyl and carboxyl groups that have extremely excellent properties in terms of gel stability, etc. makes it extremely easy to use water-containing systems of various types. It has been proposed in JP-A-54-91090 that water can be separated by a method.

However, this method also has drawbacks that are inconvenient when carried out industrially. For example, in order to separate water from water-containing oil, water-containing oil is put into a tank, hydrogel is added to it, and the water is absorbed. It takes. Also, fill the column with hydrogel 1. When water-containing oil is passed through, the hydrogel in the column absorbs water and gradually expands, which is troublesome in terms of column design, and also has drawbacks such as pressure drop and reduced flow rate.

In view of the above-mentioned current situation, the present inventors have made extensive studies and have found that by using an oil-water separating material consisting of a water-insoluble highly water-absorbing hydrogen μ and a water-insoluble base material, the present inventors have found that they can contain various types of water. The present invention was completed by discovering that water can be separated from oil in an extremely easy way.

That is, the present invention provides an oil-water separation material comprising a water-insoluble superabsorbent hydrogel and a water-insoluble base material containing a shape-imparting agent.

Since the hydrogel is used as a composite with a water-insoluble base material, the hydrogel does not fall apart like the case when the hydrogel is used alone, and when handled and washed away, the hydrogel absorbs water in the voids of the nonwoven fabric and expands. , the swelling of the nonwoven-hydrogel composite is not very large. Furthermore, since the hydrogel exists in the voids of the nonwoven fabric, there is little pressure loss when fluid is passed through it.

Apparatus Specification The water-insoluble superabsorbent hydrogel used in this invention may be one that absorbs water and swells several times to several thousand times, but does not dissolve in water.

For example, saponified starch-acrylonitrile graft polymer, saponified polyacrylonitrile, vinyl ester-ethylenically unsaturated carboxylic acid, saponified copolymer, polyethylene oxide, polyvinyl alcohol,
Polyvinylpyrrolidone, polysodium acrylate, polyacrylamide, polysodium acrylate polyacrylate copolymer, carboxymethyl cellulose, dextran,
Examples include crosslinked products such as pullulan. In particular, ethylene tetra, vinyl ester/'(Y) and ethylenically unsaturated carboxylic acid or its derivative (Zl as the main component,
: (Y+Z)=0:100~15:85, Y:Z
20: Water-insoluble superabsorbent hydrogels mainly composed of saponified copolymers or acrylic acid and/or acrylate crosslinked polymers with a molar ratio in the range of 8.0 to 80:20 absorb water. It is preferably used in the present invention because it has extremely excellent properties in terms of properties, gel strength in a water-absorbed state, gel stability, etc.

Furthermore, the water-insoluble base material used as the shaping agent used in the present invention is not particularly limited, and may be any material such as paper, cotton, fiber, wood, cloth, synthetic resin, soil, metal, glass, etc. However, the effects brought about by the method of the present invention are particularly great for nonwoven fabrics made of fibers such as bulbs, preolefins, polyester, rayon, etc., foam products, and paper. □ In the present invention, there are no particular limitations on the method for producing the oil-water separation material consisting of a highly water-absorbent hydrogel and a water-insoluble base material as a shape-imparting material. They may be mixed as is, or the superabsorbent hydrogel may be sandwiched between water-insoluble base materials. Further, if necessary, a suitable adhesive may be used as a binder.

In the oil-water separation material used in the present invention, the ratio of the highly water-absorbent hydrogel to the water-insoluble base material as a shaping agent varies depending on the required water absorption or water retention capacity, but usually, 0.01 for part
and 400 parts by weight. Preferably 0.1 to 2
00 parts by weight.

In the present invention, in addition to hydrogen μ, coloring agents, fragrances, etc. may be mixed and used as necessary.

The present invention will be explained in more detail with reference to Examples below.
The present invention is not limited to these.

In addition, the water absorption rate in Examples was calculated as follows.

Moreover, parts represent parts by weight.

Example 1 0.5 part of penzoyl chloride was added as a polymerization initiator to 60 parts of vinyl acetate/L and 40 parts of methyl acrylate, and 0.2 part of partially saponified polyvinyl alcohol/L was added using this as a dispersion stabilizer. The copolymer was dispersed in 200 parts of water containing 8 parts of common salt and subjected to suspension polymerization at 60°C for 6 hours.After polymerization, it was filtered, washed with water, and dried under reduced pressure.Dried copolymer 8.
6 parts of yam ζ in a saponification solution consisting of 200 parts of methanol μ, 10 parts of water, and 40 parts of 5N aqueous sodium hydroxide solution.
After suspending and saponifying for 1 hour at 25°C,
The temperature was raised to 5° C. and the saponification reaction was carried out for 5 hours.

After the saponification reaction was completed, a spherical hydrogel was obtained by thoroughly washing with methanol and drying under reduced pressure. Its water absorption rate was 750 fly.

Example 2 Defined valve obtained by immersing 10 parts of Kraft valve in 1000 parts of water, sufficiently beating it in a mixer, and filtering it through an 80-mesh wire mesh, and hydrogel 5 obtained in Example 1.
part and synthetic valve (Mitsui-Zeraback SWP F, -
790>7 parts is added to 800 parts of methanol/l/, mixed, made into a paper using an 80-mesh wire mesh, and dried in a hot-air oven kept at a temperature of 160°C to separate oil and water from hydrogel-filled paper. I got the material. This hydrogel-filled paper was dissolved in 100% of a toluene solution containing 0.25 parts of water.
I threw it into section 0. After stirring for 10 minutes, the hydrogel-filled paper was pulled up and the water content of the toluene solution was measured by Karl Fischer method, and it was found to be 100 PPm.

Example 3 133 parts of water was charged into a polymerization tank and 44 parts of sodium hydroxide was added.
7 parts were added and dissolved while stirring. While cooling with ice, 100 parts of acrylic acid was gradually added and neutralized with stirring. Add 0.0677 parts of potassium persulfate and 0.01 parts of N,N'-methylenebisacrylamide.

Furthermore, 6 parts of sorbitan monostearate and 470 parts of n-hexane were added and polymerized at 60° C. for 3 hours with stirring. After the polymerization was completed, dry hydrogel powder was obtained by solid-liquid separation and drying under reduced pressure. The water absorption rate of the obtained hydrogel was 850 P/P.

Example 4 After immersing 10 parts of kraft bulb in 1000 parts of water and thoroughly beating it in a mixer, the beaten Aμ paste obtained by filtering through an 80-mesh wire mesh and the hydrogen/hydrogen obtained in Example 3 were mixed.
15 parts of L and 14 parts of synthetic resin (manufactured by Mitsui-Zeraback 5WP)
E-790) and 7 parts of methano-/' were added to 800 parts of methano-/' and mixed, and the mixture was made into a paper using an 80-mesh wire mesh and dried in a hot-air oven kept at a temperature of 160°C to separate oil and water from hydrogel-filled paper. I got the material.

The hydrogel-filled paper was placed in 1000 parts of petroleum benzene solution containing 0.25 parts of water.

After stirring for 10 minutes, the hydrogel-filled paper was pulled up, and the water content of the petroleum benzine solution was measured by the Karl Fischer method, and it was found to be io ppm.

Example 5 To 100 parts of sludge containing 5% by weight of solids was added 20 parts of the hydrogel-filled paper obtained in Example 4.
Leave for 10 minutes and pull up the hydrogel-filled paper. The above-mentioned sludge became a brittle solid, and it became possible to treat it with a machine equipped with a shovel, shovel, and bait conveyor.

Claims (1)

[Scope of Claims] ■ An oil-water separation material comprising a water-insoluble superabsorbent hydrogel and a water-insoluble base material as a shape-imparting material. ■ Water-insoluble super absorbent hydrogels are ethylene), vinylester fi7 (Y), and ethylenic unsaturation X:
(Y+Z)-0: 100~15: 85Y:Z
The oil-water separating material according to claim 1, characterized in that a saponified copolymer having a molar ratio of -20:80 to 80:20 is used. ■ Claim 1, characterized in that the water-insoluble super-absorbent hydrogel uses a water-insoluble super-absorbent hydrogel made of a polymer mainly composed of acrylic acid and/or an acrylate crosslinked polymer. The oil/water separation material described. ■ The water-insoluble base material as a molding agent is a valve, polyolefin, polyester 1. The oil/water separation method according to claim 1, characterized in that a base material selected from woven cloth, foam products, or paper made of fibers such as redan is used.