What is the preparation experiment of n-bromobutane?

I. Purpose and requirements of the experiment

1. Understand the method of preparing n-bromobutane by the reaction of sodium bromide, concentrated sulfuric acid and n-butanol. ?

2. Master the installation and use of reflux reaction and gas absorption device.

Second, the experimental principle:

Reaction course: NaBr+H2SO4.

n-C4 H9 oh+HBr .

Side effects: C4H9OH.

2n—C4H9OH .

Main reagents and instruments:

Hydrogen bromide+sodium bisulfate n-C4 H9Br+H2O.

CH3CH2CH=CH2+ CH3CH=CHCH3 .

(n—C4H9)2O+H2O .

Precautions:

[1] It is necessary to shake the flask frequently during the feeding and reaction, otherwise the yield will be affected. ?

[2] Pay attention to judge whether the primary products have been steamed.

[3] When washing the product for the first time, pay attention to correctly judge the relationship between the upper and lower layers of the product, and the amount of desiccant is reasonable.