Problem with adding concentrated sulfuric acid dropwise?
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Concentrated sulfuric acid is an important catalyst for organic reactions and is commonly used in production because it is cheap and easily available. Partial carbonization will occur during dripping. How can we avoid this problem? Simple and easy method or device!
Is LZ doing a small test? 1. Control the dripping speed, do not drop too fast, and control the size of each drop. ； 2. Strengthen stirring.
In addition to the method proposed on the second floor, I will add another one. For safety and mixing effect, it is recommended to extend the dripping tube below the liquid surface, but the flow rate must be controlled, otherwise it may explode.
This post was last edited by scene000 on 2009-7-30 15:34 If it is not extended down, it is very likely to boil and splash. However, as long as the flow rate is controlled well after extending down (it is best to increase cooling), it will not explode. In terms of safety, it is safer after extending down, right?
Intensive stirring is a must. If possible, dilute sulfuric acid with an inert solvent in advance.
When dripping concentrated sulfuric acid in the laboratory, a liquid guide rod must be used, and direct dripping into the solution is not allowed. Corresponding liquid diversion facilities should also be used in the factory. Stirring is of course a must, but timely removal of heat must also be considered.
I have done many liquid reactions without carbonization, but I have encountered solid ones. I probably just strengthened the stirring and used a dropping funnel to add dropwise to the reactor and use an ice-salt bath. It was not a big problem.
The problem during the small trial was basically solved, using the methods on the 2nd and 4th floors. However, it is difficult to control effectively in production. . . Can you add a simple device to disperse sulfuric acid into the system?
7# zpzzzzzzzz What kind of fluid diversion equipment is it? It can be well dispersed in the system and will not cause local overheating!
The key is to control the temperature during the reaction and use ice salt to cool it. If the reaction kettle is used, use jacketed chilled water.