Regarding the method of adding the catalyst
Thread Content
Our company is currently producing a product that involves the addition of bromine to a benzene ring. Iron is used as a catalyst in this process to facilitate the reaction and produce FeBr3, which serves as a catalyst. However, a problem arises: when iron powder is added to the reactor, it settles at the bottom and prevents the reaction from taking place. Sometimes, after the reaction is complete, blockages can occur in the bottom valves. How is it best to join them? Is the reaction between iron and bromine an exothermic reaction?
It is recommended to place the discharge port at the top, so that the product can be discharged from above; stirring should be included, as the reaction between iron and bromine is exothermic.
It’s because your mixing speed is too slow; if you speed it up, it won’t sink to the bottom. You also can’t stop mixing while adding materials! ! !
The speed of my mixer is 1:11 – is that still slow? The discharge port is located at the top – was it modified by you? Should I switch to a different device again? Moreover, according to the feedback from the workshop, unreacted iron powder remained at the bottom after the reaction was complete. Is it really difficult for bromine to react with iron?
I think in systems involving such liquid-solid reactions, it is normal to have residue left behind, as long as the yield and quality of the products meet the design requirements. During design, the product outlet should be positioned higher than the bottom, and measures for slag discharge from the bottom must be considered ； During production, reactants should be added as accurately as possible, and appropriate reaction conditions as well as stirring intensity must be controlled.
1. I’m not sure what the 1:11 speed ratio here actually is; the speed should be expressed in revolutions per minute； 2. Iron powder has a relatively high specific gravity, so the rotation speed of the mixing impeller should be moderate. Neither too fast nor too slow is conducive to uniform suspension; too slow will result in sedimentation, while too fast will cause the particles to be flung against the walls of the tank due to excessive centrifugal force ； 3. I agree with the above opinion; it is inevitable to have some residue left behind. Raise the outlet to prevent pipe blockage.
The main reason is that the quality of the current products is not very good; the workshop has reported that the catalyst does not react well, and this is a troublesome issue
Modify the upper part, and make some choices regarding the mixing type
Your reaction is a gas-solid-liquid or solid-liquid reaction; I believe the type of mixer required for each case is different. If increasing the mixing speed does not work, the mixer should be redesigned.
Use a different mixer and increase the mixing speed. :D
It seems that bromine does not react with iron! ! The reaction is very intense in the presence of water! Can iron tribromide dissolve in bromine? It is said that bromine reacts with iron to form iron tribromide, but who has actually done this? Should the resulting iron tribromide be a solid or dissolved in bromine?