The proportion of mixed solvents was determined (exemplified with ethyl acetate, petroleum ether system) 1. The product is dissolved with ethyl acetate, and then the oil ether is added.When the solid is justified, the petroleum ether consumption is taken.Then extend the time, look at the quantity. 2.1 is like not precipitated, and the temperature of the temperature is lowered.The saturation solubility under different cases is measured. 4. The proportion of yourself, the calculation yield is optimal. I can only think so much, I found out how to do it, but it is difficult to describe
The proportion of mixed solvents was determined (exemplified with ethyl acetate, petroleum ether system) 1. The product is dissolved with ethyl acetate, and then the oil ether is added.When the solid is justified, the petroleum ether consumption is taken.Then extend the time, look at the quantity. 2.1 is like not precipitated, and the temperature of the temperature is lowered.The saturation solubility under different cases is measured. 4. The proportion of yourself, the calculation yield is optimal. I can only think so much, I found out how to do it, but it is difficult to describe
The mixed solvent is recrystallized, such as ethyl acetate is better than the product solubility and the petroleum ether is low. There are two kinds of dripping methods, a petroleum ether having a good measure in the product, the reflow is still not dissolved, and ethyl acetate is added dropwise to dissolve and clear the crystallization; The other isAdd a metered ethyl acetate into the product, reflow to drop the petroleum ether to the beginning of turbidity, anti-drop plus a small amount of ethyl acetate is also clarified, cooling the crystal
The mixed solvent is recrystallized, such as ethyl acetate is better than the product solubility and the petroleum ether is low. There are two kinds of dripping methods, a petroleum ether having a good measure in the product, the reflow is still not dissolved, and ethyl acetate is added dropwise to dissolve and clear the crystallization; The other isAdd a metered ethyl acetate into the product, reflow to drop the petroleum ether to the beginning of turbidity, anti-drop plus a small amount of ethyl acetate is also clarified, cooling the crystal
First determine the polarity of the product and impurities, then determine the ratio of the mixed solvent, can be added together, and the reflux is dissolved, and then the acetate can also be added to the acetate.There are uncommon of ethyl acetate.
First determine the polarity of the product and impurities, then determine the ratio of the mixed solvent, can be added together, and the reflux is dissolved, and then the acetate can also be added to the acetate.There are uncommon of ethyl acetate.
The mixed solvent recrystallization and a single solvent operation method is similar, that is, it is mixed drop in mixed droplets, preferably remembers the proportion of mixed solvents used
The mixed solvent recrystallization and a single solvent operation method is similar, that is, it is mixed drop in mixed droplets, preferably remembers the proportion of mixed solvents used
1. The product is dissolved with ethyl acetate, and then the oil ether is added.When the solid is justified, the petroleum ether consumption is taken.Then extend the time, look at the quantity.
2.1 is like not precipitated, and the temperature of the temperature is lowered.The saturation solubility under different cases is measured.
4. The proportion of yourself, the calculation yield is optimal.
I can only think so much, I found out how to do it, but it is difficult to describe
1. The product is dissolved with ethyl acetate, and then the oil ether is added.When the solid is justified, the petroleum ether consumption is taken.Then extend the time, look at the quantity.
2.1 is like not precipitated, and the temperature of the temperature is lowered.The saturation solubility under different cases is measured.
4. The proportion of yourself, the calculation yield is optimal.
I can only think so much, I found out how to do it, but it is difficult to describe
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There are two kinds of dripping methods, a petroleum ether having a good measure in the product, the reflow is still not dissolved, and ethyl acetate is added dropwise to dissolve and clear the crystallization;
The other isAdd a metered ethyl acetate into the product, reflow to drop the petroleum ether to the beginning of turbidity, anti-drop plus a small amount of ethyl acetate is also clarified, cooling the crystal
There are two kinds of dripping methods, a petroleum ether having a good measure in the product, the reflow is still not dissolved, and ethyl acetate is added dropwise to dissolve and clear the crystallization;
The other isAdd a metered ethyl acetate into the product, reflow to drop the petroleum ether to the beginning of turbidity, anti-drop plus a small amount of ethyl acetate is also clarified, cooling the crystal
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