成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List Bromoethane
74-96-4

Bromoethane synthesis

9synthesis methods
Bromoethane is produced by the reaction of either hydrogen or potassium bromide with cold ethanol or with ethylene and sulfuric acid (Hawley, 1977; Sittig, 1979; Merck, 1983). It is commercially available at greater than 99% purity. Production from two U.S. manufacturers was estimated at 163.5 million pounds in 1986 (CSITC, 1987); no recent import and export information was available in the literature.
-

Yield:74-96-4 93%

Reaction Conditions:

with 2-pyrrolidonium hydrogen sulfate;hydrogen bromide at 20; for 2 h;Sealed tube;

Steps:

34

Ethanol and hydrobromic acid were reacted to prepare bromoethane. The steps are as follows: In a 500 ml flask, 270 g of 60% hydrobromic acid and 40 g of protonic acid catalyst or ionic liquid were added, maintained the material temperature at about 30°C, while stirring. To the system, 120 g of 95% ethanol was added, the reaction flask was sealed and placed in a water bath to stir the reaction. The temperature continues to rise to boiling state for 1 h. The reaction flask was fed to a rectification plant, bromoethane were separated from the system. The system temperature was raised to 45 ~ 46 degrees C to collect crude ethyl bromide. When the top temperature increases to 60 ° C, collection of ethyl bromide was stopped. The crude ethyl bromide was washed twice with 10% NaOH solution, and re-distilled to obtain the finished product. The results of the reactions of each group are shown in Table 2.

References:

CN104672053,2016,B Location in patent:Paragraph 0056-0060

Bromoethane Related Search: