Preparation method of 1, 2-octylene glycol

By precisely controlling the hydrogen peroxide droplet acceleration rate and temperature, combined with an air flotation-enhanced separator and high-vacuum distillation, the problems of unstable reaction and complex separation in the production of 1,2-octanediol were solved, achieving efficient and low-cost production and resource utilization of waste liquid, and obtaining high-purity products.

CN121895115APending Publication Date: 2026-04-21CHIZHOU TIANFENG FINE CHEM CO LTD
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Patent Information

Application Number
CN202610015529.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-07
Publication Date
2026-04-21

AI Technical Summary

Technical Problem

The existing 1,2-octanediol production process suffers from problems such as unstable peroxyformic acid reaction, numerous side reactions, complex separation and recovery, low equipment utilization, and serious emissions of waste gas, wastewater, and solid waste.

Method used

The oxidation ring-opening esterification reaction is used to precisely control the acceleration rate and temperature of hydrogen peroxide droplets. Combined with an air flotation-enhanced stratifier to assist in stratification, and high-vacuum distillation to separate impurities, an internal recycling system is formed, reducing the number of waste liquid treatment steps.

Benefits of technology

This improved the safety and selectivity of the reaction, increased production efficiency, reduced production costs and emissions of waste, and yielded high-purity 1,2-octanediol products.

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Abstract

The invention relates to the technical field of chemical production, in particular to a preparation method of 1, 2-octylene glycol, the preparation method comprises the steps of oxidation ring-opening esterification reaction, saponification hydrolysis reaction and post-treatment and refining, and an air flotation synergistic layering device comprises a tank body, a central shaft, a pre-filtering unit, an air flotation unit and a driving mechanism; the central shaft is vertically mounted in the tank body, and the top end and the bottom end of the central shaft both penetrate and extend to the outside of the tank body; the center shaft is rotationally connected with the top of the tank body, and a rotating seat fixedly sleeves the bottom end of the center shaft and is rotationally connected with the bottom of the tank body; the driving mechanism is arranged at the top of the tank and used for driving the center shaft to rotate. By accurately controlling the dripping rate of hydrogen peroxide, the reaction temperature and the effective oxygen molar ratio, side reactions such as violent decomposition and over-oxidation of peroxyformic acid are inhibited, and the selectivity and safety of the reaction are improved; and rectification is carried out under the conditions of high vacuum degree and specific tower kettle temperature, so that high-boiling-point impurities can be efficiently separated out, and a high-purity target product can be obtained.
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