May Class A liquids be heated? ? ? ?

Why can’t it be heated? Heating is definitely possible, but the design requirements for the equipment are somewhat higher.

Toluene is often used in production to entrain water (toluene and water are azeotropic)

Isn’t it very dangerous to heat it above its flash point? ? How can we ensure safety?

This post was last edited by qugd on 2018-4-20 at 11:44. To ask whether a single unit can heat things up – is that not a rather silly question? Not to mention Class A liquids, any substance can be heated; it’s just that the methods, degrees, and environments of heating vary, as do the results resulting from heating that substance. Hydrogen, acetylene, and syngas can all be heated, and the propellants in solid rockets can also be heated safely. So why is there doubt regarding heating class A liquid chemicals?

Heating has nothing to do with whether it’s classified as Category A or not

Many of the questions are extremely amateurish; they weren’t even thought through. The level of many people on these issues is even worse than that of salespeople who have never studied chemistry. When working with technology, one shouldn’t ask everything; one should think first and then look up information to verify. If you have any questions, come and ask right away. This isn’t a kindergarten, and you’re not nannies

It can be heated; heating is unrelated to the classification of liquids

The question about whether to heat it or not has been answered by the brothers upstairs. It can be heated. Most of the solvents used in our chemical industry belong to Category A, such as toluene, n-hexane, ethyl acetate, methanol, DMF, and so on. Sometimes these are needed as solvents for heating under reflux, or for recovery under reduced pressure. When it exceeds the flash point, safety precautions must be taken. The three elements of combustion are fuel, oxidizer, and an ignition source. Since you’ve used this solvent, it’s impossible to remove the flammable substances. One can only start with oxidizers and an ignition source. The oxidizing agent is generally oxygen in the air. That’s why in chemical production, nitrogen is generally used for displacement in order to isolate oxygen. Of course, nitrogen displacement also serves to remove moisture from the air. Either remove the ignition source, which includes things like open flames, static electricity, sparks, and friction. Therefore, we require that workers in chemical production wear cotton clothing, that all chemical equipment be explosion-proof, that static discharge connections be installed, and that copper wires be used to eliminate static electricity.

As long as there are measures to prevent overpressure through heating, that’s sufficient.