RU2366673C2 - Polymer admixture for rapid preparation of hydrodynamically active polymer solutions - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: present invention refers to the polymer admixtures for rapid preparation of hydrodynamically active polymer solutions decreasing the hydrodynamic resistance at transporting of water mixtures in pipelines. The said admixture contains polyox (polyether) as polymer and additionally detergent and conservant Amirol-M based on product of triethanolamine interreaction with oxidised high fatty acids and water at determined component ratio.

EFFECT: enhanced stability and resistance to layering.

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Description

The invention relates to techniques for industrial transport of water mixtures through pipelines for construction, mining, metallurgical, fuel, chemical and other related industries and can be used to reduce the ultimate shear stress of mixtures and hydraulic losses during their transportation.

It is known to use hydrodynamically active polymer additives introduced in small quantities into the pumped fluids to reduce hydraulic losses during transportation. In the device for creating a wall layer in the pipeline (a.s. No. 1739162, F17D 1/16, 1992), a coupling with a conical insert forming a conical gap with the pipeline is used to introduce a low-viscosity composition into the pipeline.

The disadvantage of the additives used in this device is its lack of fluidity.

A technical solution is known (see Manzhay V.N., Ilyushnikov A.V., Gareev M.M., Nesyn G.V. Laboratory studies and industrial testing of polymer additives to reduce energy costs in the main oil pipeline. Engineering Physics Journal, 1993 volume 65, No. 5), in which the effect of the presence of an anti-turbulent additive is evaluated by the threshold shear stress on the wall of a particular pipeline.

The disadvantage of these polymer additives is high viscosity and a tendency to delamination.

A known method of reducing friction losses during pipeline transport of fluid by AS No. 872905 (publ. 10/15/1981) by feeding into the pipeline a solution of a surface-active polymer, for example: an aqueous solution of poly-1-carboxy-2-carbamidopropylene-diethyl-amino-3-phenyl-butane.

The disadvantage of this additive is the inconvenience of use: it is necessary to pre-prepare an aqueous solution, as well as the fact that this additive does not have stable characteristics of the homogeneity of the composition over time.

Known additive to reduce the hydrodynamic resistance of the coolant as.with. 777338 (publ. 07.11.80), which is used β- [N-methyl-N-olenoyl] sodium ethyl sulfonate with electrolytes NaCl and Na ₂ CO ₃ to reduce the hydrodynamic resistance of the coolant.

The disadvantage of this additive is that it works well only in a closed system.

The technical task of the invention is the creation of a polymer additive in the form of a fluid paste (for operation in an open system) based on a polymer having high stability and resistance to delamination, which should also provide high-quality and complete dissolution of the main reagent, a high molecular weight polymer, in the transported liquid medium. A polymer additive must fulfill a number of requirements that allow it to be used in technological processes, namely, a polymer additive must have:

- stable flow characteristics in a wide range of shear stresses;

- stable characteristics of the homogeneity of the composition over time (lack of phase separation from the storage time of the paste);

- lack of chemo destruction of the polymer.

The technical result is achieved by the fact that the polymer additive based on a polymer contains polyox as a polymer and additionally detergent and preservative substance Amirol-M and water in the following ratio of components, wt.%:

Amirol-M - 63%;

polyox - 30%;

water is the rest.

Distinctive features of the proposed polymer additives from the above known, closest to it, is that the polymer additive contains as a polymer polyox, additional detergent and preservative substance Amirol-M and water in the following ratio of components, wt.%:

Amirol-M - 63%;

polyox - 30%;

water is the rest.

The polymer additive is introduced into the pumped liquids in small quantities to reduce hydraulic losses during transportation of liquids. To create a wall layer in the pipeline, it is necessary to introduce a low-viscosity composition into the pipeline, for which special devices are used, for example, those described in the description of the patent for a.s. No. 1739162. In this case, a decrease in the turbulent friction drag of the pumped liquid is achieved.

The content of polyoxide powder within 30% in an aqueous solution of Amirol-M allows you to get a suspension that contains the maximum possible amount of the main reagent (polyox) in the suspension, which is highly resistant to delamination during shear flow, which is necessary for transporting the polymer additive from storage to places to enter the stream. In the fluid flow, the polymer additive should dissolve and show the effect of reducing the hydrodynamic resistance.

Using the liquid ingredient Amirol-M, which has a high kinematic viscosity and is at the same time not a solvent for polyox, allows the paste (suspension) to be highly resistant to delamination under static conditions. In addition, during the subsequent dissolution of the polymer additive (paste) in the liquid stream flowing through the pipeline, an aqueous solution of the preserving agent Amirol-M appears, which helps to slow down the process of corrosion of the pipeline caused by the flow of water. Thus, in the case of the proposed polymer additives, a decrease in the hydraulic resistance of the hydraulic track is achieved while preserving the pipeline from corrosion.

The adsorption-active additive Amirol-M (TU 38-301-48-49-47-97) is a product of the interaction of modified fatty acids of aocannolamines, soluble in water, is a homogeneous viscous-mobile mass (kinematic viscosity at 50 ° C no more 800 mm ² / s (cSt) with a good stability index (RU 2102448, 01.20.1998).

POLYOX Water Soluble Polymers are nonionic, high molecular weight, water soluble poly (ethylene oxide) polymers. The molecular weight ranges from 100,000 to 8,000,000. A high molecular weight polymer, polyox (polyethylene oxide, PEO), is a white, water-soluble powder, non-toxic, thermoplastic, with a characteristic faint odor (SU 865478, 09/23/1981; SU 777338, 11/7/1980).

Example.

The polymer additive is prepared as follows:

- 0.63 kgf of detergent and preservative substance Amirol-M is poured into the tank;

- to 0.63 kgf of Amirol-M add 70 ml of water (distilled) and mix thoroughly until a homogeneous solution is obtained with any mechanical stirrer (mixer);

- 0.30 kgf polyox in the form of a powder with a grain size dispersion of not more than 60 microns is added to the resulting solution and thoroughly mixed with a mechanical stirrer until a homogeneous suspension is obtained.

The resulting composition (paste) is poured into a sealed container in case of long-term storage and transportation.

Since the effectiveness of polymer paste is determined mainly by the value of the content of the main substance (polymer), it is necessary to create a paste with the highest possible polymer content. However, the polymer content in the paste is limited by the yield loss of the paste when a certain amount of polymer content in the resulting suspension is reached. For a suspension consisting of Amirol-M liquid and polymer powder, the limit polymer content is approximately 35%. An important characteristic of fluidity of a fluid is kinematic viscosity. In a suspension of polymer powder and Amirol-M, the viscosity begins to increase sharply with overcoming the polymer content of more than 20%. Measurements of the kinematic viscosity of the paste (suspension) depending on the concentration of the polymer at a temperature of T = 20 ° C are shown in table 1.

Table 1 The concentration of polymer in the paste, C,% 0 10 fifteen twenty 25 thirty 35 Kinematic viscosity, ν, mm ² / С 800 1100 1600 2500 40,000 64000 140,000

Adding small amounts of water to the paste results in a decrease in the viscosity of the paste, however, with an increase in water concentration, the viscosity of the paste increases sharply due to the swelling of the polymer in water. Data on the viscosity of a suspension containing 30% polymer, depending on the concentration of water are shown in table 2.

table 2 The concentration of water in the paste, C,% 0 2 four 6 7 10 12 Kinematic viscosity, ν, mm ² / s 40,000 36000 3200 28,000 27000 40,000 90,000

The results show a polymer paste containing ingredients in the following ratio:

Amirol-M - 63%;

polyox - 30%;

water - 7%

It has a minimum viscosity and, consequently, greater fluidity, which is necessary for the implementation of polymer paste dosage technology in various technical applications.

The present invention created a polymer additive in the form of a paste containing polymer powder and an aqueous solution of detergent and preservative substance Amirol-M, which can be transported through various channels (capillaries) or simply squeezed out of any container into a solvent in order to quickly and efficiently obtain a solution possessing high hydrodynamic efficiency.

Claims (1)

A polymer-based polymer additive for the rapid preparation of hydrodynamically active polymer solutions, characterized in that it contains polyox as a polymer and additionally detergent and preservative substance Amirol-M and water in the following ratio of components, wt.%:
amirol-M 63% polyox thirty% water rest