Supercritical Drying Experiment of Vacuum Preservation

Supercritical Drying Experiment of Vacuum Preservation

1. A preliminary understanding of nanomaterials and their preparation methods.

2. Learn the fundamentals of supercritical fluid drying.

3. Learn and practice the basic operations of supercritical fluid drying.

Dependence of volatile solvents in vacuum preservation in use

The use of volatile solvents has become a common problem among adolescents. It is reported that about 10% of adolescents in the United States inhale volatile solvents. Volatile solvents (eg, aliphatic and aromatic hydrocarbons, chlorinated carbons, Ketones, acetates, ethers, chloroform, alcohol) can produce short-term excitement first, followed by central nervous system depression. If used frequently, partial drug resistance and psychological dependence may occur, but withdrawal symptoms will not occur.

Early acute symptoms include dizziness, lethargy, slurred speech, and unsteady gait; impulsivity, excitement, and agitation may also occur. Delusions, hallucinations, and delusions may occur when the central nervous system is more deeply affected. Experience a euphoric, dream-like "flying" feeling that induces a short period of sleep after orgasm. Delirium, psychomotor clumsiness, emotional fragility, and impaired thinking can occur. This intoxication can last from minutes to 1 hour, or even longer.

The vacuum preservation evaporation equipment is used to select the appropriate solvent

The method of recrystallization is usually to select an appropriate solvent, so that the impurities in the impure substance are insoluble or insoluble in this solvent, and the components to be purified have a fairly good solubility in this solvent. The method of recrystallization is usually to select an appropriate solvent, so that the impurities in the impure substance are insoluble or insoluble in the solvent, and the components to be purified have quite good solubility in the solvent. Dissolve the solid to be purified with the smallest amount of hot solvent. If there are insoluble impurities at this time, the solution should be filtered under this warm condition immediately; in this way, the insoluble solid impurities can be left on the filter paper by filtration. The purity of the main component in the filtered filtrate can be increased, and then the filtrate is poured into an evaporating dish to crystallize, and the obtained crystal is a substance with increased purity. Dissolve the solid to be purified with the smallest amount of hot solvent. If there are insoluble impurities at this time, the solution should be filtered under this warm condition immediately; in this way, the insoluble solid impurities can be left on the filter paper by filtration. The purity of the main component in the filtered filtrate can be increased, and then the filtrate is poured into an evaporating dish to crystallize, and the obtained crystal is a substance with increased purity.

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