METHOD OF PRODUCING FIRE-RESISTANT LIQUID Russian patent published in 2017 - IPC C07F9/12 C07F9/14 C10M177/00 

FIELD: chemistry.

SUBSTANCE: method for producing a fire-resistant liquid by reacting a mixture of xylenol derivatives by an esterification reaction with phosphorus oxychloride. The mixture is used at the following component ratio, pts. wt.: 3.5 xylenol (65-75), 3.4 xylenol (20-25), impurities (phenol and/or m, p-cresols and/or 2.5/2.5 xylenols and/or ethylphenols) to 5 in the presence of a catalyst at 110-120°C for 9-15 hours and distillation of the resulting reaction mass is carried out. Distillation is carried out at 210-240°C and at a reduced pressure, followed by purification or aqueous-alkaline purification at a temperature of 120-150°C and a pressure of 25-40 mm Hg, and then the product is run through a filter.

EFFECT: invention makes it possible to completely exclude the toxic fractions of xylenol from the raw material while maintaining the final product of physico-chemical, operational and toxicological properties that meet all the requirements for fire-resistant hydraulic and lubricating materials.

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