Separation and purification method of dodecanedioic acid

Abstract

The separation and purification method of dodecanedioic acid includes the following steps: decolouring the fermenting liquor in which the organism is fermented with active carbon, filtering, adding chitosan and ethylene diamine tetraacetic acid into the filtrate, making them combine with impurity being in fermenting liquor to form suspended matter, microfiltering to remove the suspended matter, ultrafiltering and further removing impurity to make purification, then adding acid in the filtrate to make dodecanedioic acid precipitate, filtering and drying so as to obtain the dodecanedioic acid product.

Description

1. Technical field

[0001] The invention relates to a method for separating and purifying dodecanedioic acid, more precisely, to a method for separating and purifying dodecanedioic acid produced by fermentation. 2. Background technology

[0002] Dodecanedioie Acid (DDDA for short), also known as lauric acid, is an important chemical raw material for the manufacture of engineering plastics, nylon 12, nylon hot-melt adhesives, spices, coatings, optical cables, etc., and has a wide range of uses. The production of dodecanedioic acid generally has two methods: chemical synthesis and biological fermentation. However, due to the chemical synthesis method, the hydrogenation reaction needs to be fire-proof, explosion-proof, and poison-proof, and it must be catalytically synthesized under high temperature and high pressure conditions. Severe environmental pollution and high production costs have limited its industrial application. In recent years, the industrial production of dodecan...