Solving the diazotization reaction
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My raw materials and proportions are as follows: 300 kilograms of m-toluidine, 830 kilograms of synthetic hydrochloric acid. The reaction is carried out for 50 minutes, after which ice is added to lower the temperature to 0°C. Then, a 190-kilogram solution of sodium nitrite, which has been weighed in advance, is added gradually. Ice is continued to be added during this addition process to keep the temperature low, with the entire process taking around 35 minutes. That’s my procedure for carrying out the reaction. Now, here’s the problem: when two-thirds of the sodium nitrite solution had been added, foam began to form inside the reactor. After the addition was complete, there was a layer of foam on the surface of the reaction mixture, about 5 centimeters thick. What could be the cause of this? Does it have a significant impact on the yield? How to solve it? Please seek guidance from a professional
You failed to properly control the process control points during the operation, which had a significant impact on the yield. .
Hello, are you still working on m-chlorotoluene?
Make m-chlorotoluene? Was the feeding rate too fast, causing the diazonium salt to decompose? Try reducing the speed of adding sodium nitrite, and add ice in batches. Don’t add too much at once. It is also possible that sodium nitrite was added too quickly; it didn’t have enough time to undergo diazotization with m-toluidine, and thus reacted with hydrochloric acid, producing gas. Have you seen any red gas inside the reactor?