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Method for resource utilization of canthaxanthin isomerization filtered mother liquor

A technology for filtering mother liquor and canthaxanthin, applied in the field of nutritional chemicals, can solve the problem of low total reaction yield, and achieve the effects of improving the total reaction yield, reducing the cost of three wastes treatment, and reducing the amount of waste liquid produced.

Active Publication Date: 2021-11-23
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EP1253131A1, CN1417207A, CN110372555A and other patents have all reported the method of preparing canthaxanthin with β-carotene as raw material, because the structural formula of β-carotene contains a large amount of C=C bonds, which leads to the oxidation process, which will produce a large number of epoxidation by-products
In the currently reported process, this part of impurities enters the heterogeneous filtration mother liquor and is directly discarded, which leads to a low overall reaction yield.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, mix rhenium heptoxide, manganese oxide, graphene, and methanol according to the mass ratio of 1:2:80:800, impregnate at 30°C for 20h, filter, and dry at 100°C for 16h to obtain modified catalyst A.

[0038] Take the filtered mother liquor of isomerization reaction as the reaction substrate, add 1% modified catalyst A and 0.2% triphenylphosphine, and react at 80°C and 0.3MPaA for 24h. Reaction substrate composition: 70% n-propyl acetate, 2% canthaxanthin, 28% canthaxanthin over-oxidized impurities. The conversion rate of over-oxidation impurity reaction is 98.3%, and the selectivity is 96.5%.

Embodiment 2

[0040] First mix rhenium dioxide, tin oxide, carbon nanotubes, and ethanol in a mass ratio of 1:1:100:1000, then soak at 40°C for 16h, filter, and dry at 90°C for 24h to obtain modified catalyst B.

[0041] Take the filtered mother liquor of isomerization reaction as the reaction substrate, add 0.1% modified catalyst B and 1% triphenyl phosphite, and react at 110° C. and 0.1 MPaA for 12 hours. Reaction substrate composition: 65% tetrahydrofuran, 5% canthaxanthin, 30% canthaxanthin excessive oxidation impurities. The conversion rate of over-oxidation impurity reaction is 97.8%, and the selectivity is 96.2%.

Embodiment 3

[0043] First, mix rhenium trioxide, antimony trioxide, graphitized carbon nitride, and n-hexane according to the mass ratio of 1:0.5:50:500, then soak at 60°C for 12h, filter and dry at 80°C for 20h, and the improved Catalyst C.

[0044] Take the filtered mother liquor of isomerization reaction as the reaction substrate, add 1% modified catalyst C and 0.5% sodium sulfite, and react at 60° C. and 0.6 MPaA for 48 hours. Reaction substrate composition: 69% toluene, 5% canthaxanthin, 26% canthaxanthin excessive oxidation impurities. The conversion rate of over-oxidation impurity reaction is 98.7%, and the selectivity is 96.7%.

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PUM

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Abstract

The invention discloses a method for resource utilization of canthaxanthin isomerization filtered mother liquor, which comprises the step of preparing canthaxanthin through a deoxidation reduction reaction under the action of a modified catalyst and a reducing agent by taking the isomerization filtered mother liquor containing canthaxanthin over-oxidation impurities as a reaction substrate. According to the method disclosed by the invention, overexoxidation substances in the isomerization filtered mother liquor are deoxidized and reduced into canthaxanthin under the action of the modified catalyst, so that the total yield of an isomerization reaction is effectively increased, and the output of waste liquid is reduced.

Description

technical field [0001] The invention belongs to the field of nutritional chemicals, and in particular relates to a method for resource utilization of canthaxanthin isomerization filtration mother liquor. Background technique [0002] Canthaxanthin (also known as cantharidin) is a carotenoid found in certain mushrooms, crustaceans, fish, algae, eggs, blood and liver. In 1984, FDA / WHO approved cantharidin as a food additive and formulated quality standards. Cantharidin can be used as a food additive in beverages, ice cream, waffle biscuits, sauces, processed tomato products and processed meat products. Cantharidin is added to the feed of poultry such as chickens and ducks to produce a consumer-friendly orange color in egg yolks. [0003] Canthaxanthin can usually be prepared through synthetic routes such as chemical synthesis or biotechnology, for example, β-carotene synthesized by Witting reaction is oxidized to obtain canthaxanthin. EP1253131A1, CN1417207A, CN110372555A a...

Claims

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Application Information

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IPC IPC(8): C07C403/24B01J23/36B01J27/051B01J27/24
CPCC07C403/24B01J23/36B01J27/0515B01J27/24C07C2601/16
Inventor 宋军伟张旭沈宏强张弈宇王嘉辉
Owner WANHUA CHEM GRP CO LTD
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