A method of obtaining a de-icing reagent

 

The invention relates to a method for de-icing composition of the reagent for treatment of road and airfield pavements. The method involves mixing calcium chloride with water, and then in an aqueous solution of calcium chloride is added a solution of magnesium chloride and the resulting mixture is injected antifreeze glycol component (COG) in the following ratio, wt.%: calcium chloride - 10,6-22,0, magnesium chloride - 5,3-12,0, COG - 4,0-30,0, water - the rest. The technical result - the creation of an effective reagent available, with good melting properties at low temperature with a low degree of corrosion, do not have a negative impact on the environment. table 1.

The invention relates to a method for deicing composition aqueous solution for processing from ice formations road and airfield pavements.

A method of obtaining anti-icer - anti-icing composition used for the elimination of snow and ice formations.with. The USSR 272462, 1970). The composition contains calcium chloride or its mixture with sodium chloride, in which for the purpose of preventing corrosion of metals injected sodium nitrite calcium in the concentration at high temperatures, crystallized, dried and Packed.

The disadvantages of this method include high energy costs. In addition, the use of such composition on the roads has a negative impact on the plants growing along the roads.

Known de-icing reagent containing calcium chloride and(or) sodium chloride and / or urea and 0.01-100% polymer of ethylene oxide (polyoxide), which is suggested for use before you freeze water on concrete and asphalt roads, to prevent their destruction (U.S. patent 4094805, 1978).

The disadvantage of this reagent is not sufficiently low freezing point (not below minus 23oC).

The closest analogue of the claimed invention is the anti-icing composition of an aqueous solution comprising calcium chloride, urea and corrosion inhibitor for metal surfaces (RF patent 2169751, 2000), designed for surface treatment of roads. The composition includes calcium chloride, urea, and further comprises a corrosion inhibitor for metal surfaces from a number of Quaternary ammonium compounds, such as polyaniline or polyvinilpirolidone chloride or mixtures thereof, in the following However, this reagent is effective when a large flow rate.

The present invention is to create an efficient, affordable, with good melting properties at low temperature crystallization reagent with a low degree of corrosion, do not have a negative impact on the environment, which may be used both before and after freezing of water on the treated surface.

The problem is solved in such a way that in the process for de-icing reagent comprising a mixture of calcium chloride and water, add an aqueous solution of magnesium chloride and the resulting mixture is injected antifreeze glycol component (COG) in the following ratio of initial components, wt.%: Calcium chloride - 10,6-22,0 Magnesium chloride - 5,3-12,0 COG - 4,0-30,0 Water - the Rest
Calcium chloride, calcined take 1 grade according to GOST 450 with ISM. 1, 2, 3. The solution of magnesium chloride technical take on THE 2152-063-00209527-99 or prepared from magnesium chloride crystal.

Antifreeze glycol component take on THE 2422-01-50612932-00 and source components include ethylene glycol, sodium benzoate, borax, caustic soda, sodium nitrite, captax, butyl alcohol, steam condensate and antifoam.

This reagent,28 g/cm3for 1-1,5 hours. When this happens exothermic reaction with increasing temperature up to 80-90oC. To the resulting solution of calcium chloride immediately add a solution of magnesium chloride to the ratio of 1:2 on the base material and stirred for 1-1 .5 hours. Then in a solution of salts add COG and stirred the mixture for 0.5-1 hour. The result: an anti-icing agent, whose density is from 1.16 to 1.28 g/cm3.

To prove the conformity of the way the criterion of "Industrial applicability" are examples of the method of calculation per ton of reagent.

Example 1.

In the reactor per 1 tonne load precondensed in the amount of 450 kg, add 186 kg calcined calcium chloride and stirred for 1-1 .5 hours. In the exothermic reaction the temperature of the solution rises to 80-90oC. thereafter, the reactor was added an aqueous solution of magnesium chloride in the amount of 93 kg per basic substance and the mixture is stirred for 1-1 .5 hours until complete dissolution of the salts. Then to the resulting salt solution add 50 kg of COG and again stirred for 0.5-1 hour. The resulting antigal - ,28 g/cm3; pH from 6 to 8.5; corrosive effect on metals at 20o(Zinc coating and steel) 0,040 g/m2hour, on the concrete - 0,040 cm3/cm2.

Example 2-20 carried out analogously to example 1 by changing the quantitative ratio of the initial components. Qualitative indicators de-icing reagent obtained in accordance with examples (1-20), are summarized in table. The tests were carried out according to THE 2149-002-50612932-01.

From the presented data shows that the claimed method allows to obtain environmentally friendly anti-icing agent on energy-saving technologies with good technical parameters: temperature from freezing to -60 -21oWith that provides the action of the reagent for a long time, coefficient of corrosion on the zinc and steel from 0.020 to 0.060 g/m2hour, on the concrete from at 0.020 to 0.040 cm3/cm2.


Claims

A method of obtaining a de-icing reagent comprising a mixture of calcium chloride with water, characterized in that an aqueous solution of calcium chloride is added a solution of magnesium chloride and the resulting mixture is injected antifreeze glycol component, with Saudi glycol component 4,0-30,0
Water - The Rest

 

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