Influence of the synthesis method of tert-butylated triphenyl phosphates on the operational properties of fire-resistant fluids

DOI: 10.32758/2071-5951-2020-0-2-32-37

УДК 661.174

Medzhibovskiy A.S., Kolokolnikov A.S., Savchenko A.O., Poldushova G.A. (Qualitet Group, LLC Qualitet, Moscow)

Влияние метода синтеза трет-бутилированных трифенилфосфатов на эксплуатационные свойства огнестойких жидкостей

Keywords: Fire-resistant fluids, phosphate esters.

Abstract. Three substituted aryl esters of orthophosphoric acid are the base component of fire-resistant fluids used in the lubricating and electro-hydraulic control system at steam and gas turbines of power plants. In this paper, we studied the possibility of improving the physicochemical and performance properties of phosphates, which are made of the raw materials available in the Russian Federation: phenol and 4-tert-butylphenol by reducing the content of an undesirable component — unsubstituted triphenyl phosphate, which is particularly vulnerable towards water. According to the results of the work, the conclusions were made:

— a decrease in the content of triphenyl phosphate to a level of 1% and below leads to some improvement (reduction) of the air release time and an increase in the hydrolytic stability (represented as reducing the change in acid number after prolonged contact with water) of the fire-resistant fluid based on mixed esters. The degree of change of these properties is quantified.

— it is possible to achieve the minimum content of triphenyl phosphate by changing the phosphorylation technology. By carrying out the process stepwise, the possibility of the interaction of phosphorus oxychloride with unsubstituted phenol is substantially eliminated, that is why there is almost no probability of an undesirable component formation in the resulting mixture of esters.