1、 Recrystallization method

The recrystallization method is to remove diphenyl ether from a solution containing diphenyl ether by crystallization. The specific operation steps are as follows:

１ heat the solution and add a certain amount of anhydrous alcohol or chloroform while heating, until the diphenyl ether is completely dissolved.

2. Then gradually cool down and remove the diphenyl ether when crystallization occurs.

2、 Distillation method

Distillation is a method of removing diphenyl ether from a solvent by utilizing the difference in boiling points between two liquids. The specific operation steps are as follows:

1. Place the solution containing diphenyl ether into a distillation flask and add it to an adjustable flow condenser.

2. Heat the distillation flask and wait for the diphenyl ether to vaporize before condensing into a liquid in the condenser.

3. Finally, collect the condensed liquid to obtain a pure solvent.

3、 Extraction method

Extraction method is a method of removing diphenyl ether from a solvent by utilizing the difference in affinity between diphenyl ether and other substances. The specific operation steps are as follows:

1. Mix a solution containing diphenyl ether with another solution, and diphenyl ether will distribute to the other solution.

2. Then separate the two solutions and leave the solution without diphenyl ether.

3. Finally, extract the target substance from the remaining solution by evaporation or other methods.

In addition to the above three methods, there are other methods to remove diphenyl ethers from solvents, such as activated carbon adsorption, ion exchange, etc. But different removal methods need to be selected according to the specific situation.

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