JPH06165998A - Scale trouble preventive agent - Google Patents

Abstract

PURPOSE:To prevent sticking of scale to the piping, mixing chests, etc., of a paper making process by using the acid salts of the compds. having specific constitutional formula, for example, the acid salts of urea and urea deriv., the acid salts of thiourea and thiourea deriv., the acid salts of guanidine and guanidine deriv., the acid salts of dicyandiamide, etc. CONSTITUTION:The acid salts of the compds. expressed by the formula (X is O, S, =NH; R is H, alkyl group, alkenyl group, allyl group, hydroxyalkyl group, phenyl group; R<1> is H, cyano group, alkyl group, alkenyl group, ally group, hydroxyalkyl group, phenyl group) are incorporated as effective components into this scale trouble preventive agent. Inorg. acids, sulfonic acids, phosphonic acids, oxy acids, aliphat. acids or dibasic acids are used as the acids for producing the acid salts. The sticking of scale to the piping, mixing chests, machine chests, felt, wires, suction rolls, etc., of the paper making process are prevented by using the scale trouble preventive agent obtainable in such a manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an agent for preventing scale damage in water for the paper industry.

[0002]

2. Description of the Related Art The paper manufacturing industry is an industry that uses a large amount of water, and aluminum, calcium, magnesium, silicon, pipes, mixing chests, machine chests, seed boxes, felts, wires, suction rolls, etc. are used everywhere in the papermaking process. Scale mainly composed of iron adheres. In particular, in the felt water squeezing process, if scale is attached to the felt, unevenness of water squeezing occurs at the felt portion, causing poor formation and paper breakage, and leading to serious troubles such as water squeezing failure due to a reduction in the degree of vacuum of the suction box. In addition, on the part where the scale is attached, the pitch of resin acid from wood, the pitch of hot melt type from waste paper, dye,
Starch meal, sizing agent, etc. are attached, and in some cases, slime is generated, which causes a slime trouble.

[0003] With respect to the scale disorder, sulfuric acid, hydrochloric acid, sulfamic acid,
At present, acid cleaning with oxyacid and alkali cleaning with caustic soda are performed. In recent years, factory environmental measures,
For the purpose of improving yield and stabilizing operation, it is necessary to close the white water system of the paper machine and the entire paper mill as much as possible.
Considered at many factories and put into practice. Therefore, the scale is more likely to adhere than before. The current situation is that there is no other way to remove this scale problem than cleaning.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a scale hindrance inhibitor for water for the paper industry. For scales attached to papermaking process pipes, latex filters, etc., add a scale cleaner to the impregnated water and circulate the wash water with a pump.
It can be washed by the so-called "dip pickling" method. However, under the present circumstances, the above-mentioned cleaning method cannot be adopted in a portion where a large amount of water is required or in a place where the slope is large.

[0005]

The present invention has the general formula

[Chemical 2] (Wherein X is an oxygen atom, a sulfur atom or = NH, R is a hydrogen atom, an alkyl group, an alkenyl group, an allyl group, a hydroxyalkyl group or a phenyl group, R ¹ is a hydrogen atom, a cyano group, an alkyl group, an alkenyl group, An agent for preventing scale disorders, comprising an acid salt of a compound represented by an allyl group, a hydroxyalkyl group or a phenyl group) as an active ingredient.

When the scale disorder preventive agent of the present invention is used,
Aluminum scale used as a size fixer, industrial water, magnesium derived from groundwater, calcium scale, talc used as a filler, silicon scale derived from kaolin, etc. Scale failure can be prevented.

Specific examples of acid salts of the compounds of formula I include acid salts of urea and urea derivatives, acid salts of thiourea and thiourea derivatives, acid salts of guanidine and guanidine derivatives, and acid salts of dicyandiamide. To be Examples of urea and urea derivatives include urea, 1,3-dimethylurea,
Tetramethylurea, methylolurea, dimethylolurea, 2,4-diethylurea, N, N'-diethyl-N,
N'-diphenylurea, phenylurea, diphenylurea, 1,3-dicyclohexylurea, N, N'-di (acrylamidomethyl) urea, nitrourea, 1,6-hexamethylenediethyleneurea, semicarbazide, hydrazodicarbonamide, Examples thereof include azodicarbonamide and azobisformamide.

Examples of thiourea and thiourea derivatives are thiourea, dimethylthiourea, trimethylthiourea, tributylthiourea, 1,3-dibutylthiourea,
1,3-diisopropylthiourea, 1,3-dioctyl-2-thiourea, 1,3-didodecylthiourea, tetramethylthiourea, 1,3-dicyclohexylthiourea,
Examples thereof include thiosemicarbazide, methylthiosemicarbazide, acetone thiosemicarbazone, N, N'-bis (2-hydroxyethyl) thiourea and guanylthiourea.

Examples of guanidine and guanidine derivatives include guanidine, dicyandiamide, diguanide, guanylurea, aminoguanidine, nitroguanidine,
1,1,3,3-tetramethylguanidine, dimethylolguanidine, n-dodecylguanidine, 1,6-diguanidinohexane, diphenylguanidine, methylolguanylurea, dimethylolguanylurea, 1-n-butyldiguanide, N, N -Dimethyldiguanide, 1-o
-Tolyl diguanide, xylyl diguanide and the like.

Acid salts of compounds of formula I used in the present invention are, for example, Khim, Khim, Tekhnol, 19
71, No 12, 14-17 (Russ), obtained by reacting urea or thiourea with an aqueous solution of the corresponding acid. Acids used in acid salts of compounds of formula I include inorganic acids, sulfonic acids, phosphonic acids, oxy acids, fatty acids, dibasic acids and the like. Examples of the inorganic acid include hydrochloric acid, hydrogen bromide, sulfuric acid, nitric acid, phosphoric acid, sulfamic acid and the like. Examples of the sulfonic acid include aminobenzenesulfonic acid, o-cresolsulfonic acid, dodecylbenzenesulfonic acid, p-toluenesulfonic acid, naphthalenedisulfonic acid, 4-hydroxy-1,5-naphthalenedisulfonic acid, 3-pyridinesulfonic acid. , P-phenolsulfonic acid, poly (styrenesulfonic acid), benzenesulfonic acid, methanesulfonic acid, ethanesulfonic acid and the like.

Examples of the phosphonic acid include phenylphosphonic acid, hydroxyethane-1,1-diphosphonic acid, nitrilotrismethylenephosphonic acid and the like. Examples of oxyacids include citric acid, glycolic acid, gluconic acid, tartaric acid, malic acid, lactic acid and the like. Examples of fatty acids include formic acid, acetic acid, propionic acid, acrylic acid,
Examples thereof include capric acid, caprylic acid, caproic acid and glyoxylic acid, and acid anhydrides such as acetic anhydride can also be used. Examples of the dibasic acid include malonic acid, maleic acid, fumaric acid, glutaric acid, adipic acid, crotonic acid, succinic acid, sebacic acid and the like.

As the scale disorder preventive agent of the present invention, commercially available products such as guanidine sulfate and guanidine hydrochloride can be used. The scale disorder inhibitor of the present invention can be used as it is, but it is generally preferable to dissolve it in a solvent and use it as a solution. As the solvent, water is preferable, but alcohols such as methanol and ethanol, ethylene glycol, propylene glycol, polyethylene glycol, diethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monobutyl ether and other glycols , Dimethylsulfoxide, dimethylformamide, ethylene glycol diacetate, diethylene glycol monoethyl ether acetate and the like can be used.

It is preferable to continuously add the scale disorder preventive agent of the present invention to a raw material tank, a mixing chest, a seed box, a stock inlet, a screen, a white water pit, shower water, etc. in a papermaking process using a metering pump. The scale obstacle preventive agent of the present invention is added to white water in an amount of 1 to 1000 ppm, preferably 10 to 500 ppm, to prevent scale from adhering.

[0014]

Example The composition of the formulation example is as follows. In addition, "part" in a formulation means a weight part. Formulation Example 1 Guanidine sulfate 20 parts Water 80 parts Stir-dissolved to obtain an aqueous solution. Formulation Example 2 Urea sulfate (reagent) 36.3 parts Water 63.7 parts Dissolved with stirring to obtain an aqueous solution. Formulation Example 3 Urea 20.0 parts 36% hydrochloric acid 33.3 parts Water 46.7 parts Stir-dissolved to obtain an aqueous solution. Formulation Example 4 Urea 12.5 parts Methanesulfonic acid 20.0 parts Water 67.5 parts Dissolved with stirring to obtain an aqueous solution. Formulation Example 5 Urea 13.3 parts 50% lactic acid 40.0 parts Water 46.7 parts Dissolved with stirring to obtain an aqueous solution.

Formulation Example 6 Urea 20.0 parts Malonic acid 17.3 parts Water 62.7 parts Dissolved with stirring to obtain an aqueous solution. Formulation Example 7 Urea 30.0 parts Formic acid 23.0 parts Water 47.0 parts Dissolved with stirring to obtain an aqueous solution. Formulation Example 8 Urea 15.2 parts Phenylphosphonic acid 20.0 parts Water 64.8 parts Stir-dissolved to obtain an aqueous solution. Formulation Example 9 Dicyandiamide 20.0 parts Sulfuric acid 23.3 parts Water 56.7 parts Stirred to obtain a dispersion liquid. Formulation Example 10 Thiourea 30.0 parts Sulfuric acid 19.3 parts Water 50.7 parts Dissolved with stirring to obtain an aqueous solution.

Comparative Formulation Example 1 Sulfuric acid 20 parts Water 80 parts Sulfuric acid was added dropwise with cooling and stirring to obtain an aqueous solution. Comparative formulation example 2 Urea 20 parts Water 80 parts Stir-dissolved to obtain an aqueous solution. Comparative formulation example 3 Methanesulfonic acid 20 parts Water 80 parts Stir-dissolved to obtain an aqueous solution. Comparative preparation example 4 50% lactic acid 40 parts water 60 parts Dissolved with stirring to obtain an aqueous solution. Comparative formulation example 5 Phenylphosphonic acid 20 parts Diethylene glycol monomethyl ether 80 parts Dissolved with stirring to obtain a solution. Comparative formulation example 6 Dicyandiamide 20 parts Water 80 parts By ultrasonic treatment, dicyandiamide was finely pulverized to obtain an aqueous dispersion.

Example 1 In a beaker having a capacity of 1 liter, 970 ml of ion-exchanged water and 30 ml of 8% sulfuric acid band (sulfuric acid band 2400 ppm)
/ Water), add 2 ml of 1N-NaOH. Ceramic heater [(1mm thickness, 20 × 5mm (effective surface), 3
2w)] is set so that the heated portion is in water, and a predetermined amount of the test drug is added. Stirrer stirring for 1 h /
Energize once per 12 times per day. Cool the 1 liter beaker with running water during the test. After 24 hours of the test, the adhesion scale amount (mg / cm ² ) was determined. The results are shown in Table 1. It is clear that the formulation of the present invention has the effect of preventing scale formation and adhesion.

[0018]

[Table 1]

Example 2 The suction roll used in the high-quality papermaking process is clogged about 3 months after the replacement with a new roll, so that the water squeezing property is lowered and the paper quality is affected. After exchanging a new roll, the drug of Formulation Example 2 was continuously added to the stock inlet at 50 ppm. No clogging of the shell holes was observed even after 7 months, and the operability was improved.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoki Nagahashi 1-4-9 Kawagishi, Toda City, Saitama Prefecture Inside the Research Institute of Organo Corporation (72) Toshinobu Imahama 1-4-9 Kawagishi, Toda City, Saitama Organo Incorporated Research Institute

Claims (2)

[Claims] 1. A general formula: (Wherein X is an oxygen atom, a sulfur atom or = NH, R is a hydrogen atom, an alkyl group, an alkenyl group, an allyl group, a hydroxyalkyl group or a phenyl group, R ¹ is a hydrogen atom, a cyano group, an alkyl group, an alkenyl group, An agent for preventing scale disorders, comprising an acid salt of a compound represented by an allyl group, a hydroxyalkyl group or a phenyl group) as an active ingredient. 2. An inorganic acid as an acid for producing an acid salt,
The scale inhibitor inhibitor according to claim 1, wherein sulfonic acid, phosphonic acid, oxyacid, fatty acid or dibasic acid is used.