Method for separating alcohol-salt mixture by supercritical carbon dioxide extraction
A carbon dioxide, supercritical technology, applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems of difficult separation, corrosion of equipment, low separation efficiency, etc., to improve the total yield and high efficiency. separation effect
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Embodiment 1
[0038] Extraction of Polyols from Sorbitol Hydrocracking Rectification Alcohol Mixture
[0039]Add 500g sorbitol hydrocracking rectification alkoxide mixture in 1000ml extraction tank, each component content of alkoxide mixture is respectively: organic acid salt 30wt%, dibasic alcohol 55wt%, polyhydric alcohol dehydration product 15% (based on alkoxide The total mass of the mixture, the same below), wherein the total mass of polyols is 350g, seal the extraction tank, introduce carbon dioxide gas and pressurize to 10MPa, gradually raise the temperature of the extraction tank to 120 ° C, start timing, and stop after 8 hours of extraction Heating, gradually release the pressure of the supercritical carbon dioxide dissolved with polyols to the first-stage separation tank, detect and calculate the total amount of polyols in carbon dioxide to be 315g, keep the pressure of the first-stage separation tank at 8MPa, and keep the temperature at 50°C. After standing still for 3 hours, the...
Embodiment 2
[0041] Extraction of Polyols from Glucose Hydrocracking Rectification Alcohol Mixture
[0042] Add 500g of glucose hydrocracking rectification alkoxide mixture in 1000ml extraction tank, organic acid salt 20wt% in alkoxide mixture, dibasic alcohol 62wt%, polyhydric alcohol dehydration product 18wt%, wherein the total mass of polyhydric alcohol is 400g, seal The extraction tank is fed with carbon dioxide gas and pressurized to 12MPa. When the temperature of the extraction tank is gradually raised to 60°C, the timing is started. After 5 hours of extraction, the heating is stopped, and the pressure release of the supercritical carbon dioxide dissolved in polyols is gradually transferred to the primary separation. In the tank, detect and calculate the total amount of polyalcohols in carbon dioxide to be 380g, keep the pressure of the primary separation tank at 9MPa, keep the temperature at 40°C, and after standing for 1 hour, transfer the carbon dioxide to a place where 2% of the m...
Embodiment 3
[0044] Extraction of Polyols from Xylitol Hydrocracking Rectification Alcohol Mixture
[0045] Add 500g xylitol hydrocracking rectification alkoxide mixture in 1000ml extraction tank, organic acid salt 25wt% in the alkoxide mixture, glycol 70wt%, polyol dehydration product 5wt%, wherein the total mass of polyol is 375g , seal the extraction tank, feed carbon dioxide gas and pressurize to 18MPa, gradually raise the temperature of the extraction tank to 160°C, start timing, stop heating after 12 hours of extraction, and gradually release the pressure of supercritical carbon dioxide dissolved in polyols to a In the first-stage separation tank, detect and calculate the total amount of polyols in the carbon dioxide to be 363.75g, keep the pressure of the first-stage separation tank at 12MPa, and keep the temperature at 70°C. After standing for 5 hours, transfer the carbon dioxide to the mass of the alkoxide mixture added in advance. In the secondary separation tank of 0.5% polyoxye...
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