A kind of method for resource utilization of canthaxanthin isomeric filtration mother liquor
A technology for filtering mother liquor and canthaxanthin, which is applied in the field of nutritional chemicals, can solve the problem of low total reaction yield, achieve the effects of improving the total reaction yield, reducing the cost of three wastes treatment, and reducing the amount of waste liquid generated
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Embodiment 1
[0037] First, rhenium heptaoxide, manganese oxide, graphene, and methanol were mixed in a mass ratio of 1:2:80:800, then immersed at 30 °C for 20 hours, filtered, and dried at 100 °C for 16 hours to obtain modified catalyst A.
[0038] The isomerization reaction filtration mother liquor was used as the reaction substrate, 1% of modified catalyst A and 0.2% of triphenylphosphine were added, and the reaction was carried out at 80°C and 0.3MPaA for 24h. Reaction substrate composition: 70% n-propyl acetate, 2% canthaxanthin, 28% canthaxanthin over-oxidized impurities. The over-oxidized impurity reaction conversion rate was 98.3%, and the selectivity was 96.5%.
Embodiment 2
[0040] First, rhenium dioxide, tin oxide, carbon nanotubes, and ethanol were mixed in a mass ratio of 1:1:100:1000, immersed at 40 °C for 16 hours, filtered, and dried at 90 °C for 24 hours to obtain modified catalyst B.
[0041] The isomerization reaction filtration mother liquor was used as the reaction substrate, 0.1% modified catalyst B and 1% triphenyl phosphite were added, and the reaction was carried out at 110 °C and 0.1 MPaA for 12 h. Reaction substrate composition: 65% tetrahydrofuran, 5% canthaxanthin, 30% canthaxanthin over-oxidized impurities. The over-oxidized impurity reaction conversion rate was 97.8%, and the selectivity was 96.2%.
Embodiment 3
[0043] First, rhenium trioxide, antimony trioxide, graphitized carbon nitride, and n-hexane were mixed in a mass ratio of 1:0.5:50:500, then immersed at 60 °C for 12 hours, filtered, and dried at 80 °C for 20 hours to obtain a modified solution. Sex Catalyst C.
[0044] The isomerization reaction filtration mother liquor was used as the reaction substrate, 1% modified catalyst C and 0.5% sodium sulfite were added, and the reaction was carried out at 60°C and 0.6MPaA for 48h. Reaction substrate composition: 69% toluene, 5% canthaxanthin, 26% canthaxanthin over-oxidized impurities. The over-oxidized impurity reaction conversion rate was 98.7%, and the selectivity was 96.7%.
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