A method of obtaining a de-icing fluid for runways of airfields in the winter

 

The invention relates to the problems of removal of snow and ice formations in the operation of airfields and pavements in winter, and also to prevent the formation of ice layers. The method includes receiving a potassium acetate solution by neutralizing acetic acid potash at pH 6.0-6.5 with further increase of pH to 10-11 and the density of the solution to of 1.29-1.30 grams/cm3the addition of KOH, followed by the introduction of thickeners, which are used hydroxyethyl cellulose and salts of phosphoric acid, selected from a range centripetal and trisodium phosphate and corrosion inhibitors. The technical result - receiving deicing with a low freezing point and high preplasma ability, stable at low temperatures. 3 C.p. f-crystals, 5 PL.

The invention relates to the problems of removal of snow and ice formations during the operation of the airfield and road surfaces in winter and to prevent the formation of ice layers.

To de-icing agents (PHS) is subject to strict requirements. These materials should not destroy metals, components of modern aircraft, to ensure that the aquifers, used for drinking water supply.

From the previous prior art known to increase the effectiveness of PRTs by using an aqueous solution of potassium acetate. Thus, known methods for producing anti-icing liquid composition based on potassium acetate (SU And 1827382, C 09 K 3/18, 1993, RU AND 2017785, CL 08 To 3/18, 1991, as well as the prototype EN (11) 2142491 (13) C1-6 C 09 K 3/18), 1999. The first two methods have the common disadvantage of high corrosiveness against metals. The selected prototype provides protection of metals at a higher level and provides a rate of penetration at the level of acetate other reagents. The method of obtaining the prototype is cooking at temperatures above 20oWith an aqueous solution of potassium acetate by mixing aqueous solutions of acetic acid, potash and potassium hydroxide to pH 8-10. The choice of the quantitative ratio between supplied to the reaction chamber aqueous solutions of potash and caustic potash, lying in the range 1:2 and 1:1,5 is not controlled from the viewpoint of solubility at low temperatures resulting in high salt solutions. Therefore, in the Far North was the loss of PHS in the form of sediment potash, having smaller is the overall sediment clogs in the machine distribution system PHS on the runway, what is unacceptable.

Our country is the northernmost country among the industrialized countries, so has the need for reliable at low temperatures reagents with enhanced preplasma ability for use, primarily, in extreme conditions.

The present invention is the task of developing a method of obtaining economical PHS to the Extreme North, are stable up to temperatures of -40oWith that can, in one application to provide greater penetration of ice or snow and ice formations. This object is achieved by providing the following simultaneously acting factors: 1. With the exception of the drop of the reagent of any solid formations (saturation solutions) when the temperature drops to -40oC.

2. Lowering the temperature of crystallization reagent to...-69 -70oC.

3. The thickening of the reagent that allows a single to put on 1 m2a greater number of MARPs.

4. Increasing the exothermic effect when diluted with water.

5. The cost optimization of the reagent.

To achieve these objectives it is necessary to use the new technology and the recipe receiving PHS, namely, when receiving a high sub>2CO3in dissolved form). To this end, the neutralization of acetic acid potash is only up to pH 6,0 6,5...when the whole potash guaranteed to be spent on the education of potassium acetate, and an impurity technical potash, may be coagulants, will be present in the reagent in a minimal amount.

Obtaining an aqueous solution of potassium acetate concentration, in principle, possible neutralization of CH3The Sook, using only the STAKE, but the last 3 times more expensive To2CO3.

The necessary increase of pH andis achieved by introducing into the end of the process CON to pH 10...11 and25= 1,29...of 1.30 g/cm3.

The solubility of CH3The Cooke and CON at low temperatures is much higher than the solubility of K2CO3and therefore with decreasing outdoor temperature -40oWith and below the reagent remains stable. High content in potassium acetate solution and caustic potash provides the reagent low temperature of crystallization (...-69 -70oC) higher exothermic effect of dilution water (table 1). These factors increase problemsyou ability PHS on average 1.7 what are the consequence of its chemical composition and effect of thickening, when in one pass can be applied per unit surface area greater amount of reagent that leads, naturally, to increase the amount of melted ice.

The thickening PHS produced reagents according to table 3. Their use increases the viscosity at -20oWith 50-60 Centistokes or 2 times in comparison with compositions that do not contain thickeners.

Assessment preplasma ability PHS was carried out according to the following method. In the Cup frozen 100 ml of water. On the surface of the ice poured into 30 ml of an investigational reagent. The liquid is then formed due to the contact of ice with the reagent, periodically drained and measured the amount (in ml). The credit shall be the amount of fluid minus the initial 30 ml.

During long-term storage PHS (0.5 years and over) in his volume goes sedimentation at the molecular level; the depletion of the potassium acetate top layer of the reagent, which in some cases leads to the appearance of the crust of ice at temperatures higher than the estimated temperature of crystallization PHS. The introduction of antifreeze component with a lower specific weight than potassium acetate and water, we create the preconditions for the increase of its concentration in the upper layers, cranial the desired phase PHS on its surface.

To ensure the requirements of OST 54-830.4-90 in part anticorrosive properties inhibitors are used in the following amounts: liquid glass (0,5.. . 2.0 weight. %), sodium nitrite (...0,09 0,04 wt.%), sodium benzoate (0,1...to 7.0 wt.%).

Table 4 shows examples of the content of inhibitors and table 5 corrosion loss in g/m2PM

Corrosion tests of the proposed PHS for the metals that make up the design of the aircraft was carried out according to the methods OST 54-830.4-90. Due to the fact that according to the above OST corrosion loss of metals should be less than 0.1 g/m2h, to ensure that the recommended amount of inhibitors accepted those listed in Example 2. The content of inhibitors in Example 3 can be taken in the case, when there are increased requirements to the corrosive properties of the PRTs.

The proposed PHS is prepared in a known manner, namely: obtaining, as mentioned above, an aqueous solution of potassium acetate desired density and pH, and then successive introduction into the reactor with a working mixer thickeners and inhibitors in dry form or in the form of a solution in water according to table 4.

The technical result image is the IMD, stable at low temperatures, corresponding to the increased requirements when used in conditions of the Far North.

Claims

1. A method of obtaining a de-icing fluid for runways of airfields in the winter, including the production of a potassium acetate solution, followed by the introduction of thickening agents and corrosion inhibitors, characterized in that the neutralization of acetic acid potash lead to the point of complete transition To a2CO3in CH3The Cooke at pH 6.0-6.5 and the subsequent increase in pH to 10-11 and the density of the solution to25=1,29-1,30 g/cm3provide the addition of KOH, followed by the introduction of thickeners, which are used hydroxyethyl cellulose and salts of phosphoric acid, selected from a range centripetal and trisodium phosphate.

2. The method according to p. 1, characterized in that the thickener is hydroxyethyl cellulose in amounts of 0.001 to 0.01 wt.%, salts of phosphoric acid in the amount of 0.5-1.6 wt.% when the ratio of dinatriumfosfaatti to trisodium phosphate as 3:1.

3. The method according to p. 1, characterized in that as the corrosion inhibitors used liquid glass in the amount of 0.50 to 2.0 wt.) - Rev. DNA liquid contains propylene glycol, the monoethylene glycol, diethylene glycol or triethylene glycol in an amount of 0.2 wt.%.

 

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