Process for supercritical CO2 extraction of tropical nymphaea essential oil and extraction of pigment from flower residue

Abstract

The invention provides a process for supercritical CO2 extraction of tropical nymphaea essential oil and extraction of a pigment from flower residue. The process is used in the field of agricultural product processing, and comprises: carrying out supercritical CO2 extraction on nymphaea flowers, and purifying the extracted essential oil through a rectifying tower to obtain nymphaea essential oil;and re-extracting the nymphaea flower residue subjected to oil extraction by adopting an ultrasonic wave-assisted solvent leaching method to obtain a pigment extract. According to the invention, by extracting the nymphaea essential oil through the supercritical CO2 extraction technology, the extraction rate of essential oil can be effectively improved, no extraction wastewater is discharged, the extracted residue is free of mixing of other organic solvents, and the pigment can be extracted through the ultrasonic wave-assisted solvent extraction method so as to be applied to the food industry to replace chemical synthetic additives such as chemical synthetic pigments and the like, so that the harm of chemical additives to human bodies is reduced.

Description

technical field [0001] The invention relates to the technical field of agricultural product processing, in particular to supercritical CO 2 Extraction and pigment extraction process from flower residue. Background technique [0002] Water lily is one of the famous flowers in the world, such as tropical red water lily, which is a perennial root plant of Nymphaeaceae Nymphaea, widely distributed in tropical and temperate regions. , anti-oxidation, anti-aging, enhancing immunity and other physiological activities are of great significance to maintaining human health; [0003] Domestic existing water lily processing and production enterprises are less, existing enterprises take water lily flower as raw material to extract essential oil technology, mainly adopt traditional steam distillation method, and Thailand as the main producer of water lily essential oil also uses traditional steam distillation method as Mainly, although the process of extracting flower essential oil by s...

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Problems solved by technology

[0003] Domestic existing water lily processing and production enterprises are less, existing enterprises take water lily flower as raw material to extract essential oil technology, mainly adopt traditional steam distillation method, and Thailand as the main producer of water lily essential oil also uses traditional steam distillation method as Mainly, although the process of extracting flower essential oil by steam distillation is simple and the processing equipment is cheap, but the oil extraction rate is low, the extraction temperature is high, the aromatic components in the extracted essential oil are easily damaged, and it is easy to produce unpleasant smells such as cooking, which leads to The quality of essential oils is degraded, and an unpleasant smell of cooking will be produced during the extraction process, and other natural resources such as natural pigments in the processing by-products are not fully utilized, resulting in waste of resources and other problems;

[0004] At present, the method of extracting water lily essential oil by steam distillation is: according to the material ratio of 1:20, and using organic solvents such as dichloromethane to purify the crude extract, the yields of the extracted water lily essential oil are only 0.302% for daily flowering and 0.302% for night flowering. Flowering is 0.497%, the yield of essential oil is low, and the use of organic solvents is likely to cause safety problems in the production operation process, which may cause environmental pollution and other impacts

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