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
  • What Are the Advantages of DMC Catalyst?

    What Are the Advantages of DMC Catalyst?

    April 21, 2020DMC catalyst is a new type of high-performance catalytic olefin oxide ring-opening polymerization catalyst, suitable for synthesis of olefin oxide polyether containing 1-6 functional groups. DMC catal...view
  • Methyl Iodide Residual

    Methyl Iodide Residual

    April 15, 2020Methyl iodide has been highlighted as a potential genotoxic impurity (PGI).view
  • What Industries Can Expandable Microspheres Be Used?

    What Industries Can Expandable Microspheres Be Used?

    October 9, 2021Expandable microsphere is a kind of white thermoplastic core-shell structured microspheres consisting of polymer shells that encapsulate volatile solvents.The expandable microspheres produced by Nanji...view
  • The Misunderstood "Hero": Bronopol

    The Misunderstood "Hero": Bronopol

    May 17, 2021For a long time, the preservative industry has misunderstood bronopol, thinking that it is a formaldehyde emitter and relies on the release of formaldehyde to achieve a sterilization effect. Due to th...view
  • Do You Know  about Sodium Dodecyl Sulfate?

    Do You Know about Sodium Dodecyl Sulfate?

    September 24, 2020Sodium dodecyl sulfate is a white to yellowish powder with a special slight smell. It is easily soluble in water, slightly soluble in ethanol, and almost insoluble in chloroform, ether and light petro...view
  • The Role of Expandable Microspheres in Biomedical Engineering

    The Role of Expandable Microspheres in Biomedical Engineering

    January 26, 2024Expandable microspheres, known for their versatility and unique properties, have emerged as promising candidates in various scientific and industrial domains. In the realm of biomedical engineering, t...view
Related Products
  • Allyl Glycidyl Ether Product Name: Allyl Glycidyl EtherChemical Formula: C6H10O2CAS No.: 106-92-3Dangerous Grade: 3Technical Data of Allyl Glycidyl EtherItemUnitSpecificationResultAllyl glycidyl ether%≥99.599.75Moistu...
  • Dipropylene Glycol Dimethyl Ether Product InformationProduct Name: Dipropylene glycol dimethyl etherChemical Formula: C8H18O3CAS No.: 111109-77-4Dangerous Grade: NoneTechnical Data:ItemSpecificationPurity(wt%)≥99.00%Water content(wt%...
  • Butyl Iodide Product Name: Butyl iodideChemical Formula: C4H9ICAS No.: 542-69-8Dangerous Grade: 3Technical Data of Butyl IodideITEMSSPECIFICATIONSRESULTSAppearanceColorless transparent liquidConformsAssay≥99%99....
  • Cyclopropyl Bromide Product InformationProduct Name: Cyclopropyl BromideChemical Formula: CAS No.: Dangerous Grade: Technical Data: ITEMSSPECIFICATIONAppearanceLight yellow to colorless liquidAssay(GC % m/m)≥99%Water(% m/m)≤0....
  • 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