RU2302441C1 - Method for producing an anti-ice reagent - Google Patents

Abstract

FIELD: production of anti-ice reagents, useable for preventing and removing ice formations on airfield covers and road covers of city and country roads.

SUBSTANCE: method for producing an anti-ice reagent includes mixing inorganic salts with sequestering agent. As inorganic salts, dolomite is used, as sequestering agent - glycerin. Firstly, dolomite is processed with hydrochloric or acetic acid, then glycerin is added, the mixture is stirred, and corrosion inhibitor is added to resulting complex salt. Process is performed with grammolecule ratio between dolomite/acid/glycerin/water - 1-4-1-8, until production of anti-ice reagent of following composition: complex salt - 100 mass parts, corrosion inhibitor - 3 mass parts. For control of cover processing quality by anti-ice reagent the compound additionally contains luminescent admixture belonging to coumarone or rodamin class.

EFFECT: lowered toxicity of reagent and its freezing temperature.

3 ex

Description

The invention relates to the field of production of anti-icing reagents used to prevent and remove icy formations on airfields and pavements of urban and non-urban routes.

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

Currently, chemical-mechanical methods of dealing with icing are more productive in comparison with the thermal method using thermal machines.

It is known to use chlorides of alkali and alkaline earth metals with an anti-corrosion additive for removing snow and ice during winter maintenance of roads (USSR author's certificate, N 1560540, class C09K 3/18, 1990). Known drug has a reduced corrosion activity due to the introduction of anti-corrosion additives.

Known drug for removing ice containing 5-15 wt.% Urea, 1-5 wt.% Monohydroxy aliphatic alcohol and 60-70 wt.% Polyglycol (UK application, N 2027046, CL C09K 3/18, 1980), which contributes to the rapid melting of ice.

Known anti-icing preparations are ineffective when used for cleaning airfield and road surfaces, with a sharp change in the temperature range they cause corrosion of metals in airfield vehicles and equipment.

The closest in technical essence and the achieved effect is a method for producing anti-icing reagent for airfield coatings, carried out by combining inorganic salts with a complexing agent (US Pat. No. 2002120034, No. 2002120034, IPC S09K 3/18).

Known anti-icing preparations are effective in case of a sharp change in temperature (up to minus 20 ° С), reduce the preparation time of airfields.

However, the method involves the use of expensive starting components, for example magnesium chloride, requires additional safety measures both in the production of the reagent and in its storage and use due to the presence of glycols that are toxic in the composition.

A known method of producing an anti-icing reagent is carried out by combining inorganic salts with a complexing agent, isolating a complex salt, adding an inhibitor and a surfactant, followed by granulating the resulting product, dolomite is used as inorganic salts, glycols (diethylene glycol, ethylene glycol, propylene glycol, as complexing agents) mixtures), and first, dolomite is treated with dilute hydrochloric or acetic acid, and the resulting s until the solution temperature 140-150 ° C, was added a glycol, the mixture was stirred, followed by the addition of corrosion inhibitors and the resulting material is granulated (Patent RU №2196796, S09K 3/18).

This method involves the use of toxic glycols as a complexing agent, and along with this, evaporation of salts with subsequent granulation is provided, which naturally leads to a sharp increase in the cost of the resulting reagents due to the high energy consumption.

The technical task of the claimed invention is to simplify the process technology for obtaining anti-icing reagent, reducing its cost, eliminating toxic properties, and to control the quality of processing the coating with anti-icing reagent, the composition contains a luminescent additive from the class of rhodamines or coumarins.

This goal is achieved by the fact that glycerol is used as a complexing agent, and the process itself is carried out in one stage, excluding evaporation and granulation. The process is carried out at a molar ratio:

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

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

to obtain anti-icing reagent of the following composition, parts by weight - complex salt (salt, water, glycerin) - 100 parts by weight, inhibitor - (a mixture of salts - sodium nitrate, borax, captax, sodium benzoate) - 3 parts by weight

The resulting complex salt has the formula:

CaCl ₂ · MgCl ₂ · 2H ₂ O · C ₃ H ₇ O ₃ in the case of dolomite, hydrochloric acid and glycerol.

Ca (C ₂ H ₃ O ₂ ) · Mg (C ₂ H ₃ O ₂ ) · 2H ₂ O · C ₃ H ₇ O ₃ in the case of dolomite, acetic acid and glycerol,

We give examples of specific performance:

Example 1. 400 ml of 37% hydrochloric acid are placed in a container under a draft, water up to 1 liter is added, and then 184 g of dolomite are added in portions with stirring. At the end of the reaction, a small excess of dolomite is introduced and the precipitate is allowed to settle. The clarified brine is poured into another container and filtered. 114 g of glycerol containing 8 g of inhibitors (a mixture of salts — sodium nitrate, borax, captax, sodium benzoate) is introduced into the resulting brine with stirring.

The freezing temperature of the resulting reagent is -40 ° C. The freezing temperature of the known reagent (complex of Ca and Mg nitrates with urea) of the same concentration is -28 ° C.

Example 2. A similar method is obtained and the reagent based on acetic acid. The freezing temperature of the solution is -36 ° C.

Example 3. The composition obtained in examples 1 and 2 is additionally introduced 0.001% -0.005% luminescent additive from the class of rhodamines or coumarins.

In this way, low-cost reagents are obtained that do not contain glycols, which is significant from the point of view of safety when used and stored in the conditions of the road and airfield facilities. It should also be noted that the one-step process for producing an anti-icing reagent according to the current scheme for the production of calcium chloride.

Claims (1)

A method of producing an anti-icing reagent, comprising mixing inorganic salts with a complexing agent, characterized in that dolomite is used as inorganic salts, glycerin is used as a complexing agent, first the dolomite is treated with hydrochloric or acetic acid, glycerin is added, the mixture is mixed, an inhibitor is added to the obtained complex salt. corrosion, while the process is carried out at a molar ratio of dolomite: acid: glycerin: water = 1: 4: 1: 8, to obtain the following anti-icing reagent Ava, parts by weight: Complex salt one hundred Corrosion inhibitor 3 and to control the quality of processing the coating with an anti-icing reagent, the composition additionally contains a luminescent additive from the class of rhodamines or coumarins.