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Refinement and purification method of nonane diacid

A purification method, the technology of azelaic acid, which is applied in the field of refining and purifying azelaic acid, can solve the problems of complex process, product purity and high production cost, and achieve the effects of simplifying the process, reducing production cost and improving product quality

Inactive Publication Date: 2010-06-02
杭州友邦香料香精有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention is based on the preparation of azelaic acid, a fine chemical product, and the invention of the subsequent purification technology. The original purification method makes the product more pure, and the process is complicated and the production cost is higher.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Obtain 20 tons of the mixture of azelaic acid after the ozonation and oxidative cracking of the previous section, and rectify under reduced pressure to remove components with a boiling point before nonanoic acid; 6.5 tons of undistilled materials, 6.5 tons of undistilled materials Put it into a rectification kettle made of duplex stainless steel 2205, distill 5 tons of crude product azelaic acid under reduced pressure, put 5 tons of crude product azelaic acid into 20 tons of toluene, heat to 70-90 ° C, at this temperature Stir at low temperature for 30 minutes; start to cool down to 25°C, keep the temperature below 25°C and stir for 30 minutes, crystallize, and centrifuge to obtain the crystallized product; dry the crystallized product to obtain the finished azelaic acid.

Embodiment 2

[0015] Embodiment 2: Obtain 15 tons of azelaic acid mixture after the ozonation and oxidative cracking of the previous section, and rectify under reduced pressure to remove components with a boiling point before nonanoic acid; 4.9 tons of undistilled materials, 4.9 tons of undistilled materials Put it into a rectification kettle made of duplex stainless steel 2205, distill 3.7 tons of crude product azelaic acid under reduced pressure, put 3.7 tons of crude product azelaic acid into 18.5 tons of toluene, heat to 70-90 ° C, at this temperature Stir at low temperature for 30 minutes; start to cool down to 25°C, keep the temperature below 25°C and stir for 30 minutes, crystallize, and centrifuge to obtain the crystallized product; dry the crystallized product to obtain the finished azelaic acid.

Embodiment 3

[0016] Embodiment 3: Obtain 20 tons of the mixture of azelaic acid after the ozonation and oxidative cracking of the previous section, and rectify under reduced pressure to remove the components whose boiling point is before nonanoic acid; 6.5 tons of undistilled materials, 6.5 tons of undistilled materials Put it into a rectification kettle made of duplex stainless steel 2205, distill 5 tons of crude product azelaic acid under reduced pressure, put 5 tons of crude product azelaic acid into 15 tons of toluene, heat to 70-90 ° C, at this temperature Stir at low temperature for 30 minutes; start to cool down to 25°C, keep the temperature below 25°C and stir for 30 minutes, crystallize, and centrifuge to obtain the crystallized product; dry the crystallized product to obtain the finished azelaic acid.

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Abstract

The invention relates to a nonane diacid purification method, including the following procedures: 1, rectify nonane diacid admixture under decompressed condition, vacuum to 500Pa and keep a rectifyingstill not to exceed 180 DEG C, distill the pelargonic acid and the components with boiling points lower than that of pelargonic acid, then add water steam to the rest mixture, making sure that the total weight percentage of the monoprotic acids with boiling points lower than that of pelargonic acid in the rest material is not more than 3%; 2, rectify the rest material under decompressed condition, vacuum to approximately 300Pa and keep the rectifying still not to exceed 240 DEG C, then then add water steam and distill crude nonane diacid; 3, mix the crude nonane diacid with solvent based on mass ratio of 1:2-8, then heat the mixture to 70-90 DEG C and stir for 30 minutes, then cool the mixture to 25 DEG C and again stir for 30 minutes, and finally crystallize the mixture and centrifugateto get the crystallized product; 4, dry the crystallized product with an oven in decompressed condition to get the final product, nonane diacid. The method has the advantages that the product has a purity of above 99% and the content of monoprotic acid is less than 0.05%; the method simplifies the process and reduces production cost.

Description

technical field [0001] The invention relates to the field of chemical purification, and mainly relates to a method for refining and purifying azelaic acid. Background technique [0002] Azelaic acid is an important chemical raw material in the industrial field. It is widely used in spices, cosmetics, medical treatment, rubber, artificial leather, nylon, fibers, capacitors, oils, flame retardants, flocculants, corrosion inhibitors, lubricants, etc. important areas. Nonanoic acid is also an important chemical raw material in the industrial field. It can be used in the production of polyol esters as lubricants for fibers and jet turbines, paint dryers, plasticizers, etc. At present, most industrial production methods use oleic acid as raw material, and the reaction mechanism is oxidative cracking of double bonds. The oxidation methods include chromic acid oxidation method, potassium permanganate method, nitric acid method, air oxidation method, ruthenium salt oxidation method,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/18C07C51/44C07C51/43C07C51/42
Inventor 俞中江翁卫栋王璟琳安利民施志明郭湘云
Owner 杭州友邦香料香精有限公司
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