Nanjing Chemical Material Corp.
Service
Products

How Is Ethyl Bromide Prepared From Ethyl Alcohol How Is Ethyl Bromide Prepared From Ethyl Alcohol

1. The Formation of Ethyl Bromide

10 mL of 95% ethanol and 9 mL of water are added to a 100 mL round bottom flask. Under constant shaking and cooling, 19 mL of concentrated sulfuric acid is slowly added. The mixture is cooled to room temperature. The finely divided 15 g of sodium bromide is added with stirring, and a few additional zeolites are added. Carefully shake the flask to make it even. The lower end of the condenser tube is connected to the lead pipe. Ethyl bromide has a very low boiling point and is extremely volatile. To avoid losses, cold water and 5 mL of saturated sodium bisulfite solution are added to the receiver. Cool in an ice water bath and allow the end of the receiving tube to be submerged in the aqueous solution. Start heating on low heat, make the reaction liquid boil slightly, and let the reaction proceed smoothly until no ethyl bromide is flowing out. (As the reaction proceeds, the reaction mixture begins to have a large amount of gas. At this time, the heating intensity must be controlled. Do not cause bumping and then the solid gradually decreases. When the solids disappear completely, the reaction solution becomes viscous and then becomes a transparent liquid. Now it is near the end of the reaction. Check the presence or absence of ethyl bromide in a beaker containing water.

2. Purification of Ethyl Bromide

Pour the liquid from the receiver into the separatory funnel. After static stratification, transfer the crude ethyl bromide below to the dry conical flask. Under the cooling of ice water, carefully add 1 ~ 2mL concentrated sulfuric acid, while shaking the cone to cool. The lower concentrated sulfuric acid is separated by a dry separatory funnel. The upper layer of ethyl bromide is poured from a tapping funnel into a 50 mL flask, and several zeolites are added for distillation. Since the boiling point of ethyl bromide is very low, the receiver should be cooled in ice water. Accept the fraction of 37 ~ 40 °C. The yield is about 10 g (The yield is about 54%).

Pure ethyl bromide is a colorless liquid with a boiling point of 38.4 °C and nD 20 = 1.4239

Note: If the reaction mixture is not shaken before heating, the reaction is prone to bumping and the reaction fails. When starting the reaction, heat it with a small heat to avoid the escape of hydrogen bromide. When adding concentrated sulfuric acid, be sure to pay attention to cooling to avoid the loss of ethyl bromide. The experiment process uses two liquid separations, the first time to retain the lower layer, and the second time to the upper layer product. During the reaction, neither the reaction time is enough, nor the distillation time is too long. The water is over-distilled to cause the sodium sulfate to solidify in the flask.

Ethyl bromide

Related Products Wiki
  • Have You Heard of Glycollic Acid Peeling?

    Have You Heard of Glycollic Acid Peeling?

    October 30, 2020glycolic acid is a heavyweight ingredient in skin care, which is often used in exfoliator, toner or facial masks. Because of its strong skin care effect, it is often used for chemical peeling, but hig...view
  • An Overview of Amphoteric Surfactant

    An Overview of Amphoteric Surfactant

    September 24, 2020The amphoteric surfactant is a surfactant that contains both anionic and cationic hydrophilic groups in the same molecule. Its biggest feature is that it can both give protons and accept protons. In t...view
  • Monoammonium Glycyrrhizinate

    Monoammonium Glycyrrhizinate

    April 29, 2019Licorice is the root of leguminous plants, mainly produced in Mongolia, Shanxi, Gansu, Ningxia and Xinjiang.view
  • Mild Action of Amphoteric Surfactants on the Skin

    Mild Action of Amphoteric Surfactants on the Skin

    January 15, 2021Amphoteric surfactants are surfactants that contain both anionic and cationic hydrophilic groups in the same molecule. The greatest characteristic is that it gives and receives protons. In use they ha...view
  • Introduction to DMC Catalyst

    Introduction to DMC Catalyst

    August 25, 2020The DMC catalyst has a freezing point of 4 ℃ and a boiling point of 90 ° C. It is a colorless transparent liquid with a slight aromatic smell at room temperature. It is easy to volatilize and has th...view
  • The Emergency Treatment of Methyl Iodide

    The Emergency Treatment of Methyl Iodide

    October 30, 2020What protective measures should be taken during the use of methyl iodide cas? What should we do if the leakage happens by accident? The answers are as follows: I. The emergency treatment of leakage Ev...view
Related Products
  • Butyl Iodide Product Name: Butyl iodideChemical Formula: C4H9ICAS No.: 542-69-8Dangerous Grade: 3Technical Data of Butyl IodideITEMSSPECIFICATIONSRESULTSAppearanceColorless transparent liquidConformsAssay≥99%99....
  • Expandable Microspheres Product Name: Expandable microspheresChemical Formula: N/ACAS No.: N/ADangerous Grade: 9Technical Data of  Expandable MicrospheresThermoplasticShoesThermosetArtificial marblesSynthetic rubberRubb...
  • Copper extractant Product Name: Copper extractant Chemical Formula:CAS No.:Dangerous Grade:Technical Data:ITEMSSPECIFICATIONPackaging: Storage and expiry date: Application:ZJ988X series copper extraction agent is compo...
  • Heptyl Bromide Product Name: Heptyl BromideChemical Formula: C7H15BrCAS No.: 629-04-9Dangerous Grade: 3Technical Data of Heptyl BromideItemMethodSpecificationResultAppearanceVisual TestColorless clear liquidPassPur...
  • TEL:+86-25-52337978
  • EMAIL: info@njchm.com
  • ADDRESS:12/F, Block B, Technology and Innovation Building, Nanjing University of Technology, No.5 New Model Road, Nanjing 210009, China