RU1816284C - Process for preparing liquid coolant - Google Patents

Abstract

Application: chemical industry, for internal combustion engines. SUMMARY OF THE INVENTION: a method for producing a coolant comprises mixing benzoic acid with an aqueous solution of sodium hydroxide in excess with the formation of sodium benzoate, adding to the alkaline solution of sodium benzoate successively additives: sodium nitrite, sodium salt of 2-mercaptobenzene azole and dextrin with stirring and heating, separate preparation of an aqueous solution of glycol and aqueous solutions of additives: borax, dye and antifoam, mixing an aqueous solution of glycol with solutions containing additives, h This provides an increase in the anti-corrosion properties of the coolant. 2 tab. 5 yo

Description

The invention relates to chemical synthesis technology, and in particular to methods for producing coolants, and can be applied in other sectors of the national economy.

An object of the invention is to increase the anticorrosive properties of a coolant by improving dissolution conditions.

The goal is achieved in that the proposed method for producing a cooling liquid based on an aqueous glycol solution includes mixing an excess of an aqueous solution of sodium hydroxide with benzoic acid, adding, with stirring and heating to an alkaline solution, the resulting sodium benzoate, subsequently, additives; sodium nitrite, sodium salt of 2-mercaptobenzthiazole, dextrin, separate preparation of aqueous solutions of additives: borax, dye, antifoam, and water-glycol solution, mixing water-glycol solution with solutions containing additives. In the table. 1 also shows the mass fraction of each of the components of a known liquid prepared by a known method and by the proposed method. The liquid prepared according to the proposed method contains instead of potassium nitrate and sodium silicate other inhibiting additives: sodium salt of 2-mercaptobenzthiazole, dextrin.

For the preparation of a liquid according to the proposed method, components available in abundance by the chemical industry are used.

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The process of preparing the liquid according to the proposed method is reduced to the following operations. The calculated amount of water, 10% of the total amount, to which the necessary amount of alkali, in this case sodium hydroxide, is added, is received into the apparatus with a mixer. The solution was heated to a dissolution temperature (60-70 ° C) and stirred for 10 minutes. Then, benzoic acid is added to the alkali solution and a neutralization reaction is carried out with stirring at a temperature of about 60 ° C. During this time, benzoic acid in the alkaline solution completely reacts with the formation of sodium benzoate, however, an excess of free alkali remains, the amount of which corresponds to stoichiometry of the chemical reaction. Alkali is taken 1.5-2 times more than necessary. From the table. 1 it can be seen that the formulation of the prepared liquid according to the proposed method contains about 1.8 times more alkali sodium hydroxide than that prepared by the known method. According to the known method, 0.33 parts of sodium hydroxide is consumed per 1. part of benzoic acid, and according to the proposed method, 0.5-1.5 parts. This excess of sodium hydroxide makes it possible to provide, after this reaction, an alkaline solution of sodium benzoate, which is necessary for better dissolution of the subsequent components.

Into the obtained alkaline solution of sodium benzoate is loaded at a temperature of about 60 ° C the calculated amount of the remaining additives in any order and after each addition 8 is mixed for 10 minutes.

The mixing time of each of the components may vary depending on the amount and composition.

Next, an aqueous glycol solution is prepared. Various glycols and water may be used for this. Water is dosed, based on the formulation of the charge, minus the water required to prepare the additive solution and sodium hydrate tetraborate.

Separately, an aqueous solution of sodium tetraborate hydrate, a dye and a quencher is prepared. The amount of water is 10% of its total amount. Sodium tetraborate hydrate, dye, antioxidant are dissolved at a temperature of 40 ° C with an interval of 10 min. Next, the resulting solutions are poured into one apparatus and mixed for one hour. Finished products are served on tap.

The proposed method allows to increase the anticorrosive properties of the liquid, due to the introduction of new components, and also mainly due to separate

preparation of additive solutions. Table 2 shows comparative data on the corrosive effects on metals of a liquid prepared by the known method and by the proposed one.

The proposed method can be prepared on the basis of ethylene glycols and other liquid compositions containing additives including benzoic acid, sodium tetraborate hydrate and alkali.

For the preparation of the coolant in our method, the amounts of the components indicated in the formulation, as well as the mixing time after loading each component are strictly calculated and cannot be different, otherwise

the resulting product will have other

non-conforming properties.

Separate preparation of solutions

components according to our method, taking into account

The interaction time of each of the components proposed by us allows us to significantly increase the efficiency of the process, improve the anticorrosive properties of the liquid, reduce the time, eliminate additional operations, and increase the productivity of the installation. Long production trials fully confirmed the above results.

Claims (1)

The claims A method of producing a coolant for internal combustion engines based on a water-glycol solution with additives, comprising mixing benzoic acid with an aqueous solution of sodium hydroxide to form sodium benzoate, adding sodium nitrite successively to the sodium benzoate solution and additives with stirring and heating, mixing glycol with a solution of sodium benzoate with sodium nitrite and additives including borax, dye and antifoam, characterized in that benzoic acid is mixed with an excess of hydroxide sodium, sodium salt of 2-mercaptobenzthiazole and dextrin are used as additives to an alkaline solution of sodium benzoate, and aqueous solutions of borax, dye and antifoam are prepared separately mixed with pre-prepared aqueous glycol solution. Table 1 table 2