A method for synthesizing azelaic acid through combined oxidation of hydrogen peroxide and potassium permanganate

Abstract

The invention relates to a method for synthesizing anchoic acid through combined oxidation of hydrogen peroxide and potassium permanganate. The method comprises the following steps: mixing oleic acid, a phosphotungstic acid catalyst and benzyl triethyl ammonium chloride, and rapidly stirring and heating under the condition of introducing oxygen; adding potassium permanganate, adding a hydrogen peroxide solution, and separating the mixed liquid in a separating funnel after reaction is ended, wherein manganese dioxide is arranged at the lower part of a water layer; an oil layer is arranged on the water layer and is easy to separate; refrigerating and crystallizing the separated water phase, and separating out white powder; and carrying out suction filtration and drying, so as to obtain anchoic acid solid. According to the method disclosed by the invention, other chemical apparatuses do not need to be used in the overall reaction process, so that energy consumption is lowered; the reaction speed is increased; the time is saved; a lot of organic solvents are not required in the reaction; and the method is environment-friendly and relatively high in reaction yield; a one-step reaction process is simple; a reaction system is easy to separate; the production cost is effectively reduced; and the method is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a method for synthesizing azelaic acid through combined oxidation using oleic acid, hydrogen peroxide and potassium permanganate as oxidation. Background technique [0002] Azelaic acid can be used as a raw material for spices, lubricating oils, oils, polyamide resins and for alkyd resins, paints and chemical synthesis. Most of azelaic acid is used to produce dioctyl azelate (DOZ) plasticizers . [0003] The preparation of azelaic acid and pelargonic acid by oxidizing oleic acid with hydrogen peroxide is the main method of synthesizing azelaic acid and pelargonic acid at present. Chinese patent 200710042766.6 discloses a method for preparing azelaic acid with a solid acid catalyst, which is characterized by a short reaction time and no pollution to the oxidant; the disadvantage is that the concentration of the oxidant hydrogen peroxide is required to be hi...

AI Technical Summary

Problems solved by technology

Chinese patent 200710042766.6 discloses a method for preparing azelaic acid with a solid acid catalyst, which is characterized by a short reaction time and no pollution to the oxidant; the disadvantage is that the concentration of the oxidant hydrogen peroxide is required to be higher than 50%, which is expensive and not easy to produce in China. have to

Although the yield of azelaic acid prepared by oxidation of oleic acid by potassium permanganate method is relatively high, due to the need for a large amount of potassium permanganate oxidizing agent, the amount of manganese dioxide solid produced as a by-product is also large, and post-processing is troublesome, so this method is rarely used

Chinese patent 200610029216.6 discloses a method for preparing azelaic acid by catalytic oxidation of an ozone-hydrogen peroxide mixed oxidant. The advantage of this method is that it does not use high-concentration hydrogen peroxide; the disadvantage is that two-step reactions are required, and ozone reacts at high temperature prone to explosion