Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing anchoic acid by microwave cracking ozonization reaction product

A reaction product, ozonation technology, applied in the direction of ozone oxidation to prepare carboxylic acid, organic chemistry, etc., can solve the problems of low product purity, large amount of potassium permanganate, environmental pollution, etc., and achieve the effect of process cleaning

Inactive Publication Date: 2006-02-01
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
View PDF9 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The selectivity of the nitric acid oxidation reaction is not high, and the equipment is severely corroded
The oxidized oleic acid method using potassium permanganate as an oxidant has a low yield and consumes a large amount of sulfuric acid and potassium permanganate, which not only has high cost but also causes serious pollution
Although the technology of potassium permanganate method can be improved by emulsification method, the consumption of potassium permanganate is still very large, and the post-treatment is very complicated, which is not economically desirable.
Using chromic acid as an oxidant is expensive, and it is easy to degrade the oxidation product to produce a low-carbon chain dibasic acid, and the resulting product is not high in purity
It can be seen that in many existing technologies, some methods pollute the environment, some methods have more complicated steps, some methods need to support noble metal catalysts, and need to pass oxygen for a long time, which is time-consuming and costly.
Some methods require high pressure, harsh implementation conditions, high cost, and difficult to scale production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] With chemically pure oleic acid 42.4g (0.15mol, oleic acid mass percentage composition is 74.1%) and the mixture control temperature of industrial glacial acetic acid 215ml (3.5mol) at 42 ℃ in ozonation reactor with ozone (control concentration w( Ozone)=7%) contact reaction 1 hour, generate the ozonation reaction product of oleic acid; Then put the ozonation reaction product in the microwave reactor, under the oxygen condition, carry out the microwave oxidative cracking reaction of the ozonation reaction product, reaction The time is 0.5 hours; after the reaction is finished, the product is subjected to conventional distillation, extraction, crystallization, suction filtration, and drying to obtain 16.7 g of the product azelaic acid, the yield is 80% in terms of oleic acid, the melting point is 106-108 ° C, and the by-product nonanoic acid is obtained at the same time .

Embodiment 2

[0034] With chemical pure oleic acid 42.4g (0.15mol, oleic acid mass percentage composition is 74.1%) and the mixture control temperature of industrial glacial acetic acid 860ml (15mol) at 60 ℃ in ozonation reactor with ozone (control ozone concentration w( Ozone)=5%) contact reaction 1.5 hours, generate the ozonation reaction product of oleic acid; Then put the ozonation reaction product in the microwave reactor, under the oxygen condition, carry out the microwave oxidative cracking reaction of the ozonation reaction product, react The time was 1.0 hour; after the reaction, the product was distilled, extracted, crystallized, filtered and dried to obtain 15.5 g of azelaic acid, the yield was 74% based on oleic acid, and the melting point was 106-108° C., and the by-product nonanoic acid was also obtained.

Embodiment 3

[0036] With chemical pure oleic acid 42.4g (0.15mol, oleic acid mass percentage composition is 74.1%) and the mixture control temperature of industrial glacial acetic acid 43ml (0.75mol) at 25 ℃ in ozonation reactor with ozone (control ozone concentration w (ozone)=2%) contact reaction 3.5 hours, generate the ozonation reaction product of oleic acid; Then the ozonation reaction product is put into the microwave reactor, under the oxygen condition, carry out the microwave oxidation cracking reaction of the ozonation reaction product, The reaction time was 0.8 hours; after the reaction was finished, the product was distilled, extracted, crystallized, suction filtered, and dried to obtain 16.9 g of the product azelaic acid, with a yield of 81% in terms of oleic acid and a melting point of 106-108 ° C. At the same time, the by-product nonanoic acid was obtained .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
boiling pointaaaaaaaaaa
refractive indexaaaaaaaaaa
Login to View More

Abstract

The anchoic acid process includes the contact reaction between the mixture of oleic acid and solvent and ozone under controlled temperature inside a ozonizing reactor, setting the ozonized product in a microwave reactor and introducing oxygen to produce microwave oxidation cracking reaction of the ozonized product, and treating the product through distillation, extraction, crystallization, suction filtering and drying to obtain anchoic acid and side product nonoic acid. The said process has no need of catalyst, short cracking reaction time, high anchoic acid yield up to 80 %, reuse of solvent, reaction converting ozone into oxygen and no environmental pollution, and is suitable for large scale production.

Description

technical field [0001] The invention relates to a method for preparing azelaic acid by using microwave cracking ozonation reaction product. Background technique [0002] Azelaic acid, also known as azelaic acid, is a white to yellowish monoclinic prism, needle-like crystal or powder. Molecular formula C 9 h 16 o 4 , molecular weight 188.22, specific gravity 1.0291 (4°C), 1.225 (25°C), melting point 106.5°C, boiling point 286.5°C (13.33kPa), refractive index 1.4303 (111°C), medium-length carbon chain plus two carboxyl groups, giving Azelaic acid has a wide range of uses and is an important intermediate in organic synthesis. [0003] Azelaic acid can be used to synthesize dioctyl azelate (DOZ) plasticizer, synthetic perfume, lubricating oil and polyamide and other products. Dioctyl azelate, didecyl azelate, and tridecyl azelate are good lubricants. Azelaic acid is also used in the production of nylon 69 and nylon 9. Azelaic acid is aminated and h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/18C07C51/34
Inventor 吾满江·艾力胡书明张亚刚董昕高军军樊莉
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI