A method of obtaining a de-icing reagent

 

(57) Abstract:

The invention can be used to prevent and remove ice formations on airfield pavements and removal of snow and ice cover in winter road maintenance. A method of obtaining a de-icing reagent is a combination of inorganic salts with complexing agents, highlighting the complex salt, addition of an inhibitor and a surfactant, followed by granulation of the obtained product, and as inorganic salts dolomite use as complexing agents - glycol, and the first dolomite treated with dilute hydrochloric or acetic acid formed is evaporated salt until the solution temperature of 140-150oC, add glycol, the mixture is stirred, the received complex salt type corrosion inhibitors - ethoxylated monoalkylphenols based trimers of propylene as a surfactant and the resulting substance granularit. When this process is carried out at a molar ratio of dolomite-acid-glycol-water/1-4-1-8 respectively to obtain the de-icing reagent of the following composition, wt.h.: complex salt (salt, water, glycol) - 100 mA is H2OS4H10ABOUT3in the case of hydrochloric acid or Sa(C2H3ABOUT2)2Mg(C2H3ABOUT2)22H2OS4H10ABOUT3in the case of acetic acid. The technical result - the simplification of the process of obtaining a de-icing reagent, reducing its cost, elimination of fire hazard properties at elevated temperatures and in the presence of organic matter (spills of fuel, lubricants, and so on).

The invention relates to the field of production of de-icing agents used to prevent and remove ice formations on airfield pavements and roads in urban and non-urban routes.

For airfields and roads the most energy-intensive, time-consuming and costly process is the removal of ice formations and increase the frictional properties of coatings.

Currently, chemical and mechanical methods of icing are more productive compared with thermal method using heat engines.

It is known the use of chlorides of alkali and alkaline earth metals with corrosion inhibitor to remove snow and ice cover in winter content is Onna activity due to the introduction of anti-corrosion additives.

A well-known drug for the removal of ice, containing 5-15 wt.% urea, 1-5 wt. % monohydroxy aliphatic alcohol and 60-70 wt.% polyglycol (application of UK 2027046, C 09 K 3/18, 1980), which contributes to the rapid melting of ice.

A method of obtaining anti-icing material is carried out by mixing mineral fillers with chlorides of alkali and alkaline earth metals by heating and subsequent introduction of molten sulfur (USSR author's certificate 1719420, C 09 K 3/18, 1992).

Known anti-icing drugs are ineffective when used for cleaning airfield pavements, the sudden change of the temperature range, cause corrosion of metals airfield machinery and equipment.

The closest in technical essence and the achieved effect is a method for de-icing reagent for airfield pavements carried out by the combination of inorganic salts with complexing agents, highlighting the complex salt, addition of an inhibitor and a surfactant, followed by granulating the obtained reagent (Patent RU 2123022 C1, 09 K 3/18, running from 10.12.1998).

As the inorganic salts used the s on oxides, hydroxides or metal salts (see Chemical encyclopedic dictionary. M: Soviet encyclopedia, 1983, S. 381), and as complexing agents use - urea (carbamide).

As surface-active substances used nonionic surfactants of the type based on the products of the interaction of ethylene oxide or propylene with APS.

Known this drug is effective when a sudden change in temperature (up to minus 20oC) reduces the time of preparation of the aerodrome.

However, the method involves the use of expensive inputs such as urea, requires additional safety measures as in the manufacture of the reagent, and during its storage and use, due to the presence in the structure of nitrates and urea and low thermal stability (decomposes at 150oWith, and in the presence of organic matter at temperatures above 150-160oWith decomposes with explosion, like all nitrates).

The technical objective of the claimed invention is the simplification of the process of obtaining a de-icing reagent, reducing its cost, elimination of fire hazard properties at elevated temperatures and in the presence is in the process for de-icing reagent, implemented by the combination of inorganic salts with complexing agents, highlighting the complex salt, addition of an inhibitor and a surfactant, followed by granulation of the obtained product, as inorganic salts dolomite use as complexing agents - glycols (diethylene glycol, ethylene glycol, propylene glycol or mixtures thereof), and at first dolomite treated with dilute hydrochloric or acetic acid formed is evaporated salt until the solution temperature of 140-150oC, add glycol, the mixture is stirred, then add corrosion inhibitors and surfactants derived substance granularit. When this process is carried out at a molar ratio:

a) in the case of hydrochloric acid/dolomite-acid-glycol-water/1-4-1-8 respectively;

b) in the case of acetic acid/dolomite-acid-glycol-water/1-4-1-8 respectively;

to obtain the de-icing reagent of the following composition, wt.h.: complex salt (salt, water, glycol) - 100 wt.h.; inhibitor (mixture of salts, sodium nitrate, borax, captax, sodium benzoate) - 3 wt.h.;

Surfactant is ethoxylated monoalkylphenols - 1 wt.h.

The received complex salt has the formula

l2BR>Sa(C2H3O2)2Mg(C2H3O2)2H2OS4H10ABOUT3in the case of dolomite, acetic acid and diethylene glycol;

CaCl2MgCl22H2OC2H6O2in the case of dolomite, hydrochloric acid and ethylene glycol;

CaCl2MgCl22H2OC3H8O2in the case of dolomite, hydrochloric acid and propylene glycol.

Examples of specific performance:

Example 1. In capacity under the thrust placed 400 ml of 37% hydrochloric acid, add water to 1 l, and then the portions enter 184 g of dolomite under stirring. Upon completion of the reaction, introducing a slight excess of dolomite and allow the precipitate to settle. The clarified brine is poured into another container and filtered. The resulting filtrate is evaporated on a gas burner until the temperature of the brine 140-150oC. To the obtained solution under stirring impose 114 g of diethylene glycol, containing 8 g of inhibitors (a mixture of salts, sodium nitrate, borax, captax, sodium benzoate). Then add 2 g of the surfactant. The resulting reagent in the form of a melt is cooled and crushed to granules. (In industrial production suggest to granulation by known technologies for producing granulated UD% solution of the obtained reagent -28oC. freezing point known reagent (complex nitrates of CA and Mg with urea) of the same concentration -26oC.

Example 2. In a similar way we obtain and reagent based on acetic acid. The melting point of the obtained product 40-50oC. the freezing point of a 30% solution -26oC.

Example 3. In capacity under the thrust placed 400 ml of 37% hydrochloric acid, add water to 1 l, and then the portions enter 184 g of dolomite under stirring. Upon completion of the reaction, introducing a slight excess of dolomite and allow the precipitate to settle. The clarified brine is poured into another container and filtered. The resulting filtrate is evaporated on a gas burner until the temperature of the brine 140-150oC. To the obtained solution under stirring impose 62 g of ethylene glycol, containing 8 g of inhibitors (a mixture of salts, sodium nitrate, borax, captax, sodium benzoate). Then add surfactant 2, Receive a reagent having a freezing temperature of -44oC.

Example 4. In a similar way we obtain and reagent-based propylene glycol. The freezing point of the resulting product -42oC.

Thus, get the reagents low cost, does not contain sochetautsa. It should be noted and single-stage process of technological process of obtaining de-icing reagent according to the current pattern of production of calcium chloride.

A method of obtaining a de-icing reagent comprising a mixture of inorganic salts with complexing agents, the addition of surfactant is polyoxyethylene monoalkylphenols based trimers of propylene with subsequent granulation of the obtained reagent, characterized in that the inorganic salts used dolomite, as complexing agents - glycol, and the first dolomite treated with hydrochloric or acetic acid, the formed salt concentrate to a temperature of brine 140-150oC, add glycol, the mixture is stirred, the received complex salt type corrosion inhibitor, surfactant and granularit reagent, the process is carried out at a molar ratio of dolomite/acid/glycol/water - 1-4-1-8 to obtain a de-icing reagent of the following composition, wt. including :

Complex salt - 100

Corrosion inhibitor - 3

SAS - 1

 

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