JP3110992B2 - Valuables recovery agent for white water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an acrylic cationic
The present invention relates to a novel wastewater recovery agent comprising a dispersion of a water-soluble polymer. The wastewater recovery agent of the present invention prevents the flow of raw materials, reduces costs, and treats treated water and stock materials. The purpose is to aim for reuse.

[0002]

2. Description of the Related Art Various valuable recovering agents for white water have been proposed. For example, a Mannich product of polyacrylamide, a partially hydrolyzed product of polyacrylamide, a (meth) acryloyloxyethyltrialkylammonium chloride / acrylamide copolymer (Japanese Patent Application Laid-Open No.
No. 01992) is famous as a valuable resource recovery agent for white water. Many amphoteric methacrylate cations are known as papermaking chemicals. Further, as a sludge dehydrating agent, a cationic copolymer comprising an acryloyloxyethyldimethylbenzylammonium salt structural unit, an acryloyloxyethyltrimethylammonium salt structural unit and an acrylamide structural unit (JP-A-62-26279)
No. 9) is known.

[0003] The effect of the valuable resource recovering agent of white water is to take a form of use known as a flocculant, the purpose of which is to reduce the cost by reusing the stock material and the treated water as described above. Can be used for a sedimentation treatment device such as a saveall, but can be used more effectively for a pressure flotation treatment device. The pressurized levitation processing apparatus has become the mainstream of recent processing apparatuses because of its high processing capacity per unit area. Naturally, the above-mentioned conventional chemicals can be used in the present apparatus. However, conventional chemicals are still insufficient in performance for the above-mentioned purpose, and new chemicals have been demanded.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. By using an optimal chemical as a valuable resource recovery agent for white water, cost reduction by recycling stock material and treated water is achieved. An object of the present invention is to provide a flocculant chemical for reducing the installation area of a processing apparatus by using a valuable recovery agent for white water suitable for a pressure flotation processing apparatus.

[0005]

Means for Solving the Problems The invention of claim 1 is:
(A) acryloyloxyethyldimethylbenzylan
Monium salt structural unit, (B) acryloyloxyethyl
Trimethylammonium salt structural unit, (C) acrylia
Each containing 5 mol% or more
Dispersion polymerization in an aqueous polyvalent anion salt solution
The following containing an acrylic cationic water-soluble polymer
A valuable resource recovery agent for white water consisting of a polymer dispersion with properties
It is. (1) The concentration of cationic water-soluble polymer in the dispersion is fivefold
% Or more (2) Average particle size of cationic water-soluble polymer in dispersion
Is 0.1 to 150 microns (3) The viscosity of the dispersion is 10 to 3000 m at room temperature
pas · s (4) Salt concentration in the dispersion is 15% by weight or more, saturation concentration
Or less (5) dispersant concentration of acrylic cationic dispersion
1 to 15% by weight based on the water-soluble polymer
Easy-to-work value of white water characterized by having physical properties
It is a material recovery agent. The invention according to claim 2 is characterized in that the acrylic
The thionic water-soluble polymer is (A) acryloyloxyethyl
Dimethylbenzylammonium salt structural unit, (B)
Chryloyloxyethyltrimethylammonium salt structure
Unit, (C) Copolymer comprising acrylamide structural unit
The polymer dispersion according to claim 1, wherein
It is a white water recovery agent consisting of The invention of claim 3 provides
The total of the monomeric structural units is at least 15 mol%.
3. The value of white water according to claim 1 or 2,
It is a material recovery agent. Filler and Pal
And the collection rate cannot be increased.
No. A fourth aspect of the present invention is to provide an ammonium sulfate having a concentration of 2 wt%.
Intrinsic viscosity in aqueous solution is 10 dl / g or more
The polymer dispersion according to claim 1, wherein
This is a valuable recovery agent for white water. The intrinsic viscosity of the molecular material
It is an index.If the molecular weight is not high, the cohesion is weak and the separation speed is high.
Degree, ie, the processing capacity is reduced.

A cationic polymer electrolyte in which a benzyldimethylammonium salt type cationic group and a trimethylammonium salt type cationic group coexist in the same polymer together with an acrylamide structural unit is generally used due to its unique synergistic effect. Stronger cohesive force than cationic polymer coagulant. Moreover, this functional group is insoluble in aqueous solutions of polyvalent anions such as sulfates and phosphates, and is polymerized with stirring in the presence of a dispersing agent to provide a free-flowing cationic aqueous solution with excellent storage stability. A hydrophilic polymer dispersion can be produced. The dispersion has various properties as described in claim 1 . The dispersant comprising the polymer electrolyte according to claim 1 is an acid salt or a methylated product of dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth).
A water-soluble (co) polymer containing 50 to 100 mol% of a cationic monomer selected from acid salts or methylated acrylamides, dimethyldiallylammonium salts and mixtures thereof, with the balance being acrylamide (naturally including these mixtures) ) Is the most common. Examples of the dispersion medium include aqueous solutions of salts such as ammonium sulfate, sodium sulfate, magnesium sulfate, aluminum sulfate, sodium dihydrogen phosphate, and ammonium dihydrogen phosphate.

As a dispersant and a polymerization initiator used for synthesizing a cationic water-soluble polymer dispersion, a known radical generator is used, and a redox-based or azo-based radical generator is used. During the synthesis, that is, during the polymerization, the PH is acidic so that the cationic monomer does not deteriorate, and the starting temperature is selected to be an appropriate temperature at which the initiator functions. When used, the concentration of the cationic water-soluble polymer is 0.01 to 0.5.
It is added as an aqueous solution of about% by weight. At this time, if an aluminum salt is used in combination, the effect is improved due to PH buffering action or coagulation action. Low molecular weight cationic polymer,
For example, dimethyldiallylammonium chloride polymer,
Use in combination with a polyamine / epichlorohydrin condensate or the like does not depart from the present invention.

[0008]

EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist.

(Synthesis example) Stirrer, thermometer, reflux condenser,
In a 1-liter five-neck separable flask equipped with a nitrogen inlet tube, 4.2 g of polyacryloyloxyethyltrimethylammonium chloride and 84.0 g of ammonium sulfate were taken as dispersing agents, and 303.2 g of ion-exchanged water was added and dissolved. . 52.08 g of acryloyloxyethylbenzyldimethylammonium chloride (3.
0 mol%), 24.93 g (20 mol%) of acryloyloxyethyltrimethylammonium chloride and 22.87 g (50 mol%) of acrylamide.
While heating to 0 ° C., the atmosphere was replaced with nitrogen. To this was added 2.0 g of a 1% aqueous solution of 2,2′-azobis (2-amidinopropane) hydrochloride as a polymerization initiator.
After polymerization at 10 ° C. for 10 hours, a polymer of fine particles dispersed in an aqueous salt solution was obtained. The viscosity of the reaction solution was measured using a B8-H type viscometer manufactured by Tokyo Keiki Co., Ltd.
CP. To this reaction solution, 21 g of ammonium sulfate was added and dissolved, and the viscosity was measured in the same manner.
P. In addition, when observed with an optical microscope, the average particle size was 15 microns. This liquid was called Sample 1, and Samples 2 to 4 were synthesized by the same synthesis method as Sample 1, except that the monomer composition was changed. On the other hand, Samples 5 to 9 were synthesized by aqueous polymerization. Table 1 shows a list of the synthesized samples. The intrinsic viscosity, which is an index of the molecular weight of the polymer, was measured in a 2% by weight aqueous solution of ammonium sulfate.

[0010]

[Table-1]

(Example 1) Table 2 shows the results of a levitation test performed under the test conditions of a pressurized water pressure of 4 atm and a pressurized water addition amount of 20%. The quality of the white water subjected to the test was PH: 7.0, filler SS: 900 ppm, and total SS: 2570 ppm.

[Table-2]

[0012]

The acrylic cationic water-soluble compound of the present invention
Recycling of valuable white water from polymer dispersion containing polymer
It is clear from the above test results that the sorbent has a clear advantage in the recovery of white water over the comparative aqueous polymer . As a factor of such excellent effect
It is presumed that polymerization occurred in aqueous salt solution.
Low viscosity, good dispersibility in wastewater, benzyl
Methyl ammonium salt type cationic group and trimethyl alcohol
When the ammonium salt type cationic group has an acrylamide structure
Coexistence in the same molecule together with the position. Such an advantage cannot be expected from the empirical facts of the paper industry so far, and it can be said that the inventive step of the present invention has been sufficiently proved.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D21F 1/66-1/82 C02F 1/52-1/56

Claims (4)

(57) [Claims] (A) Acryloyloxyethyl dimethyi
Rubenzylammonium salt structural unit, (B) acryloy
Ruoxyethyltrimethylammonium salt structural unit,
(C) 5 mol% or more of each acrylamide structural unit
Containing a polyelectrolyte dispersing agent
Acrylic cation dispersed and polymerized in aqueous solution of Nion salt
Polymer dispersion containing water-soluble polymer having the following properties
A valuable resource recovery agent for white water composed of liquid. (1) The concentration of the cationic water-soluble polymer in the dispersion is 5% by weight
%that's all (2) The average particle size of the cationic water-soluble polymer in the dispersion is
0.1-150 microns (3) The viscosity of the dispersion is 10 to 3000 mp at room temperature.
as ・ s (4) The salt concentration in the dispersion is 15% by weight or more and the saturation concentration is
under (5) The dispersant concentration in the dispersion is acrylic cationic water
1 to 15% by weight based on the soluble polymer 2. The acrylic cationic water-soluble polymer.
But A) acryloyloxyethyldimethylbenzyla
Ammonium salt structural unit, (B) acryloyloxyethyl
Rutrimethylammonium salt structural unit, (C) acrylic
Characterized as a copolymer consisting of amide structural units
A valuable resource of white water comprising the polymer dispersion according to claim 1.
Collection agent. 3. The total sum of the cationic monomer structural units is 1
2. The composition according to claim 1, wherein the content is 5 mol% or more.
3. An agent for recovering valuable resources of white water, comprising the polymer dispersion according to 2. 4. An aqueous solution of ammonium sulfate having a concentration of 2% by weight.
Characteristic viscosity in the medium is 10 dl / g or more.
White comprising the polymer dispersion according to claim 1
A valuable resource recovery agent for water.