How to prepare bromomethane from sodium iodide
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Why is the yield so low when using sodium hydrosulfide and methanol in a ratio of 1:1.2, stirring them in a reactor and heating it to 50 degrees Celsius, followed by a sulfuric acid drip reaction?
The temperature is too low; hydrobromic acid and methanol are added dropwise simultaneously to 120-degree hydrobromic acid
This post was last edited by alifeng on 2019-4-30 at 16:35. It is obtained through a reaction using methanol, sodium bromide, and sulfuric acid as raw materials. The process is as follows: Sodium bromide is first added to a lead-lined or enamel-coated reaction vessel; sulfuric acid and methanol are then pumped in via pipes. Steam is introduced through the jacket for heating. When the reaction temperature reaches 60°C, the reaction rate is carefully controlled. After the bromomethane gas leaves the reaction vessel, it is cooled in a copper condenser, then sent to an alkali water (5% NaOH) washing tower to remove acids, followed by a sulfuric acid drying tower to remove water. Finally, the gas is compressed to 0.98 MPa to yield the final product.