JP2003292934A - Method for reducing frictional resistance in piping of water-based heat carrying medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reduction effect-keeping type method for reducing frictional resistance in piping of a water-based heat carrying medium, in which increase of a flow rate and reduction of pump power can be expected over a long period by excellent frictional resistance-reducing effect in piping, and having low toxicity and less environmental load when a frictional resistance- reducing agent is discarded. <P>SOLUTION: The reduction effect-keeping type frictional resistance-reducing agent in piping is obtained by combining (a) an amine oxide type nonionic surfactant alone or a mixture of two or more of amine oxide type nonionic surfactants and (b) a betaine type amphoteric surfactant alone or a mixture of two or more of betaine type amphoteric surfactants with (c) an aromatic carboxylic acid salt alone or two or more of aromatic carboxylic acid salts. Persistency of frictional resistance-reducing effect in piping can be improved by adding the agent into piping. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold / hot water heat transport system using pipes, in which turbulent vortices in the pipes are suppressed by the formation of micelles of a surfactant, and frictional resistance generated between the pipe wall and the transport medium. The present invention relates to a friction resistance reducing agent composition and a resistance reducing method for reducing the power of a transfer pump to improve the efficiency of energy transportation.

[0002]

2. Description of the Related Art As an efficient means for transporting heat energy through a pipe, it is known that in a cold water or hot water transport system in a turbulent region, the addition of a specific substance reduces the frictional resistance in the pipe. However, among the substances that have been studied so far, the polymer system was not suitable for circulation piping because the molecule was sheared by the pump and the function was lost in a short period of time.
Further, the cationic surfactant exhibits a resistance reducing action by forming a rod-shaped micelle structure in the presence of a counterion, and the micelle structure is regenerated even when subjected to the shearing force of the pump, so that the function is restored, Suitable for circulation piping. However, since it has a strong bactericidal action, it imposes a heavy burden on the environment, and there is a problem in its practical application. Also, the patent application publication Sho 60
The compound described in -99199 is a method for reducing the frictional resistance of a flowing aqueous medium, which is characterized by adding a specific amine oxide compound. However, the use of only these amine oxides has problems that the effect of reducing frictional resistance in piping is weak, a large amount of addition is required, and the effect is weakly sustained and cannot be used for a long period of time.

[0003]

DISCLOSURE OF THE INVENTION In district heating and cooling and building air conditioning, the cost of transporting the heat medium in the entire system is large, and reducing the cost is an issue for energy saving, and reducing frictional resistance. The use of agents is very effective. A surfactant-based friction resistance reducing agent whose function is restored by regenerating the micelle structure even when subjected to the shearing force of the pump is suitable for such a circulation system pipe. In addition, it is necessary to develop a surfactant which does not contain a cationic surfactant having a strong bactericidal property and has a small environmental load upon disposal. An object of the present invention is to provide a method for reducing the frictional resistance in a pipe of a water-based heat carrier medium, which has an excellent frictional resistance reduction effect in a pipe, can be used for a long time in a circulation system pipe, and has a small load on the environment. Is a surfactant for high-density heat transport that contributes to energy-saving transport technology. The present inventors have already proposed a combination of amine oxide and various amphoteric surfactants in Patent Application Publication No. 2000-313872. However, although this method shows an excellent effect of reducing frictional resistance in piping, the effect persistence is not sufficient and there is a problem that it is difficult to use it in an actual device for a long time.

[0004]

[Means for Solving the Problem] As a result of the research conducted by the inventors,
As a method for reducing the frictional resistance in the pipe of the water-based heat transfer medium, one or more amine oxide type nonionic surfactants (a) represented by Chemical formula 1 and Chemical formula 2, Chemical formula 3, or Chemical formula 4 are used. The aromatic carboxylate (c) represented by Chemical formula 5 is used for the composition of the frictional resistance reducing agent in the pipe composed of the betaine type amphoteric surfactant (b) represented by
It was found that the durability of the frictional resistance reducing effect in the pipe can be improved and the long-term use can be achieved by adding singularly or a combination of two or more kinds thereof, or further by adding one or more kinds of the azole compound. .

[0005]

[Chemical 6] In the formula of the component (a) represented by Chemical formula ¹ , R ¹ has 8 to 8 carbon atoms.
It means 22 alkyl or alkenyl having 8 to 22 carbon atoms. Further, in the formula, R ² and R ³ have 1 to 1 carbon atoms.
4 alkyl, alkenyl having 1 to 4 carbon atoms, or an alkylene glycol ether group represented by H- (OC _n H _2n ) _p . n means 2 or 3 or a mixture thereof (random or block). m and p are 0
It is a number of 10.

[0006]

[Chemical 7] In the formula of the component (b) represented by Chemical formula ² , R ¹ , R ² and R ³ are groups represented by Chemical formula ¹ , X is (CH ₂ ) _n COO ⁻ , or CH.
_{2 CH (OH) CH 2 SO} 3 - shows the. Y is oxygen or
Represents a group represented by CONH or COO, n is 1 to 1
It is a number of zero.

[0007]

[Chemical 8] In the formula of the component (b) represented by Chemical formula 3, R ¹ , R ² and R ³ represent the group represented by Chemical formula ¹ , and X represents the group represented by Chemical formula ² . n is 1
It is a number of -10.

[0008]

[Chemical 9] In the formula of the component (b) represented by Chemical formula 4, R ¹ is a group represented by Chemical formula ¹ . s is a number of 1 to 3 and m is a number of 0 to 10.

[0009]

[Chemical 10] In the formula of the aromatic carboxylic acid salt (c) represented by Chemical formula 5, R ⁴ is H or NO ₂ . Z represents sodium or potassium. q is a number from 1 to 2. Preferred aromatic carboxylic acid salts are sodium 3-nitrophthalate, sodium 4-nitrophthalate, sodium 2-nitroisophthalate, sodium 4-nitroisophthalate, sodium 5-nitroisophthalate, and sodium nitroterephthalate.

As the azole compound, there are an imidazole derivative, an oxazole derivative, a thiazole derivative, a triazole derivative, an oxadiazole derivative, a thiadiazole derivative, a tetrazole derivative, an oxatriazole derivative, a thiatriazole derivative, and a condensed ring with a benzene ring. Examples thereof include benzotriazole, benzopyrazole, and benzimidazole, with benzotriazole being particularly preferable.

95 to 5 parts by weight of the amine oxide type nonionic surfactant (a) alone or in combination of two or more kinds;
The betaine-type amphoteric surfactant (b) is used alone or in admixture of two or more kinds in a proportion of 5 to 95 parts, while the aromatic carboxylate (c) is used alone or in combination for improving the effect sustainability.
A combination of two or more kinds, or a combination of two or more kinds of azole compounds is further added. The addition amount of (c) is 0.0 with respect to the total number of moles of components (a) and (b).
1 to 5 times by mole, preferably 0.1 to 1 times by mole, and the azole compound is 0.01 to 5 times by mole, preferably 0.05 to 5 times by mole, with respect to the total number of moles of the components (a) and (b). It is 1 time mole. Even if the amount added is higher than the upper limit, the effect does not change, and if the amount is lower than the lower limit, the effect cannot be obtained. The composition formulated by combining the above compounds is used as a reducing agent for the frictional resistance in the piping of the water-based heat carrier medium in an amount of 0.005 to 10 relative to the amount of water.
It is added at a concentration by weight of 0.05 to 1.0% by weight. Further, if necessary, additives such as a rust preventive, a scale preventive, a slime treating agent, a dispersant and a preservative can be added. The temperature range is from low temperature during cooling to 1 during heating.
It is preferably applied at about 120 ° C, particularly 5 ° C to 60 ° C.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The coconut oil fatty acid amide propyl betaine is synthesized by the following method. 0.62 kg of sodium chloroacetate was added to 1.12 kg of commercially available coconut oil fatty acid amidopropylamine and reacted at 80 to 85 ° C., then neutralized with sodium hydroxide, and coconut oil fatty acid having a solid content of 30% Amidopropyl betaine was obtained. The specific amine oxide was synthesized by a known method.

A friction resistance reducing agent (D) formulated by combining the amine oxide type nonionic surfactant (a), the betaine type amphoteric surfactant (b) and the aromatic carboxylic acid salt (c).
R agent) and D formulated by combining an amine oxide type nonionic surfactant (a) with a betaine type amphoteric surfactant (b), an aromatic carboxylate (c) and an azole compound.
The performance of the R agent is determined by measuring the pressure loss ΔP in the test section L (m) when the test fluid flows in the pipe having the pipe inner diameter d (m), and the friction is calculated by the formula shown in Table 1. The coefficient is calculated, and the frictional resistance reduction effect (D
R effect).

[0014]

[Table 1]

[0015]

EXAMPLE FIG. 1 shows the evaluation apparatus used in the experiment in this example. The device has a pipe diameter of 6 (mm) and a total pipe length of 5
(M), the flow velocity is 2 (m / s), and the amount of water is 9 liters, this device is an acceleration test in which the fluid undergoes a considerably larger shearing force than the actual equipment with a large pipe diameter when the fluid flows. It is a device. Pipe diameter 200 (mm), flow velocity 1 (m / s)
In the actual equipment, the shear rate is 40 (1 / s), whereas it is 2700 (1 / s) under the conditions of this test device. The effect duration in the verification test using the actual equipment was 3 months or more in Example 2 and 10 days in Comparative Example 4, so the accelerated test of this Example is effective.

Example 1 Cetyldimethylamine oxide (CDMAO) and myristyldihydroxyethylamine oxide (MDEAO) as amine oxide type nonionic surfactant (a), and coconut oil fatty acid amide propyl betaine as betaine type amphoteric surfactant (b). (CAPB), sodium 3-nitrophthalate (NPN) as aromatic carboxylic acid salt (c)
a), benzotriazole (B as an azole compound
The DR effect (%) was obtained by adding T) to the flowing water system of the evaluation device.

Example 2 Component (a) was prepared from oleyl dihydroxyethylamine oxide (ODEAO) and cetyldimethylamine oxide (C).
DMAO) and (b) component as 2-hydroxyalkyl (C
12,14) -N, N-dimethyl acetic acid betaine (2HA
DMB) and evaluated in the same manner as in Example 1.

Example 3 Component (a) was myristyl dihydroxyethylamine oxide (MDEAO), and component (b) was N-acyl oleate-N'-carboxyethyl-N'-hydroxyethylethylenediamine sodium (OCEHEEDNa). It evaluated similarly to 1.

Comparative Example 1 Except that no benzotriazole (BT) was added,
Evaluation was performed in the same manner as in Example 1.

Comparative Example 2 Evaluation was made in the same manner as in Example 1 except that sodium 3-nitrophthalate (NPNa) was not added.

Comparative Example 3 Example 1 except that sodium 3-nitrophthalate (NPNa) and benzotriazole (BT) were not added.
It evaluated similarly to.

Comparative Example 4 Example 2 was repeated except that sodium 3-nitrophthalate (NPNa) and benzotriazole (BT) were not added.
It evaluated similarly to.

Comparative Example 5 Example 3 except that sodium 3-nitrophthalate (NPNa) and benzotriazole (BT) were not added.
It evaluated similarly to.

Comparative Example 6 Component (a) was prepared from oleyldihydroxyethylamine oxide (ODEAO) and cetyldimethylamine oxide (C).
DMAO) and benzotriazole (BT) as an azole compound were used for evaluation. And evaluated.

Comparative Example 7 As component (a), oleyldimethylamine oxide (O)
It was evaluated using DMAO).

The results of Examples 1 to 3 and Comparative Examples 1 to 7 are shown in Table 2.
Shown in.

[0027]

[Table 2]

[0028]

INDUSTRIAL APPLICABILITY The present invention reduces frictional resistance in piping in a mass transfer system for a water-based heat carrier medium such as a fluid water system for heat transportation for district heating / cooling and building air conditioning, a cooling water system for various factories, and fire extinguishing water. However, the present invention relates to a surfactant for high-density heat transport that contributes to energy-saving transport technology by reducing transport power, reducing heat loss, increasing transport water volume, and reducing pipe diameter. INDUSTRIAL APPLICABILITY The present invention has a smaller environmental load than conventional cationic surfactants, and enables a flow rate increase and power reduction due to a better effect of reducing frictional resistance in piping, as compared with a specific amine oxide compound, for a long period of time. This is a method for reducing the frictional resistance in a pipe of a usable water-based heat transport medium.

[Brief description of drawings]

FIG. 1 is a diagram of an experimental apparatus according to an embodiment of the present invention.

[Explanation of symbols]

1 Differential pressure test section 2 run-up section 3 Flow pump 4 tanks 5 Electromagnetic flow meter 6 refrigerator 7 heater 8 Differential pressure transmitter

Claims (7)

[Claims] 1. An amine oxide-type nonionic surfactant (a) represented by Chemical formula 1, alone or in combination with two or more, and a betaine-type amphoteric surfactant represented by Chemical formula 2, Chemical formula 3, or Chemical formula 4. To the composition of the frictional resistance-reducing agent in a pipe, which is composed of (b) alone or in combination of two or more kinds, the aromatic carboxylic acid salt (c) represented by Chemical formula 5 is added alone or in combination of two or more kinds. A method for reducing the internal frictional resistance of a water-based heat carrier medium, which is capable of improving the durability of the internal frictional resistance reduction effect. [Chemical 1] In the formula of the component (a) represented by Chemical formula ¹ , R ¹ has 8 to 8 carbon atoms.
It means 22 alkyl or alkenyl having 8 to 22 carbon atoms. Further, in the formula, R ² and R ³ have 1 to 1 carbon atoms.
4 alkyl, alkenyl having 1 to 4 carbon atoms, or an alkylene glycol ether group represented by H- (OC _n H _2n ) _p . n means 2 or 3 or a mixture thereof (random or block). m and p are 0
It is a number of 10. [Chemical 2] In the formula of the component (b) represented by Chemical formula ² , R ¹ , R ² and R ³ are groups represented by Chemical formula ¹ , X is (CH ₂ ) _n COO ⁻ , or CH.
_{2 CH (OH) CH 2 SO} 3 - shows the. Y is oxygen or
Represents a group represented by CONH or COO, n is 1 to 1
It is a number of zero. [Chemical 3] In the formula of the component (b) represented by Chemical formula 3, R ¹ , R ² and R ³ represent the group represented by Chemical formula ¹ , and X represents the group represented by Chemical formula ² . n is 1
It is a number of -10. [Chemical 4] In the formula of the component (b) represented by Chemical formula 4, R ¹ is a group represented by Chemical formula ¹ . s is a number of 1 to 3 and m is a number of 0 to 10. [Chemical 5] In the formula of the aromatic carboxylic acid salt (c) represented by Chemical formula 5, R ⁴ is H or NO ₂ . Z represents sodium or potassium. q is a number from 1 to 3 2. The method for reducing frictional resistance in a pipe of a water-based heat transport medium according to claim 1, wherein the component (b) represented by the chemical formula 2 in claim 1 is coconut oil fatty acid amide propyl betaine. 3. The aqueous system according to claim 1, wherein the component (b) represented by Chemical formula 3 in claim 1 is 2-hydroxyalkyl (C12,14) -N, N-dimethylacetate betaine. Method for reducing frictional resistance of heat transport medium in piping. 4. The component (b) represented by the chemical formula 4 in claim 1 is N-acyl oleate-N′-carboxyethyl-N ′.
-Hydroxyethyl ethylenediamine sodium, The method for reducing frictional resistance in a pipe of a water-based heat transport medium according to claim 1. 5. The component (c) represented by the chemical formula 5 in claim 1 is sodium 3-nitrophthalate, sodium 4-nitrophthalate, sodium 2-nitroisophthalate, sodium 4-nitroisophthalate, 5-nitroisophthalate. The method for reducing frictional resistance in a pipe of an aqueous heat transport medium according to claim 1, wherein the method is sodium acid salt or sodium nitroterephthalate. 6. The method for reducing frictional resistance in a pipe of a water-based heat transport medium according to claim 1, wherein one or more azole compounds are added. 7. The method for reducing frictional resistance in a pipe of an aqueous heat transport medium according to claim 1, wherein the azole compound according to claim 6 is benzotriazole.