SU486007A1 - Method for preparing monooxystearic acid - Google Patents

Description

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This invention relates to a method for producing monooxystearic acids, i.e. ush, in the manufacture of lubricants.

A known method of producing monopoic stearic acids is that oleic acid is reacted with boron trifluoride monohydrate in a molar ratio of 1: 3 in acetic acid 1 at a temperature of 80-90 ° C, followed by treatment of the reaction mixture with alkali and separation of the target product by known methods.

The disadvantage of this method is the use of large quantities of acetic acid, the need for subsequent distillation and concentration, which complicates the process through the use of additional equipment.

It has been proposed to conduct the process of interaction of oleic acid with boron trifluoride monohydrate at a temperature of 20-80 ° C and a molar ratio of oleic acid and boron trifluoride monohydrate equal to 1: 1-2.

Example To 100 g of technical oleic acid with an oleic acid content of 75%, add 15 ml of boron trifluoride monohydrate. The mixture is heated when moving at 50 ° C in a nitrogen atmosphere for

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20 minutes. The reaction mass is washed with water, then 150 ml (50% excess) of a 15% aqueous alcohol solution of sodium hydroxide are added and the mixture is heated at 85 ° C in

for 2 hours The reaction mass is treated with 50 ml of 30% hydrochloric acid, the upper layer is separated, washed with hot water and dried in a thin layer. Crystallization from hexane isolated white powder with

m.p. 75-76 ° C, an acid number of 184.5 mg KOH / G, a saponification number of 186.7 mg KOH / g, an iodine number of 5.8 g iodine / 100 g, and a basic substance content of 90-92%. The output in terms of pure oleic acid 80%.

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PREAMETE OF THE INVENTION

The method of obtaining monooxystearic acids by reacting oleic acid with monohydrate boron trifluoride at elevated temperature, followed by treating the reaction mass with alkali and isolating the target product with known methods, characterized in that, in order to simplify the process and reduce the consumption of reagents, the process is carried out at a temperature of 80 ° C and a molar ratio of oleic acid and boron trifluoride monohydrate, equal to 1: 1-2.