Seeking help with a reaction kettle
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A palladium on carbon catalyst needs to be added to my reaction vessel, and the solvent used is methanol. A senior colleague told me that when a palladium-carbon catalyst is added to a methanol solution, it can easily generate sparks, and that it is prone to becoming ineffective due to contamination by metal ions. So, what material should I choose for the reaction vessel? Commonly used materials nowadays include stainless steel and enamel; which one is more suitable? Thank you!
It should be a catalytic hydrogenation reaction, right? It's better to choose stainless steel
Epoxy-coated reaction vessels can be used to prevent the presence of metal ions; lining with plastic is another option, but it should not be used when the reaction temperature is high. As for sparks, it’s not clear whether they can be avoided or if their occurrence is inevitable. If they can be avoided, that should be done by making changes to the manufacturing process. If their occurrence is inevitable, measures should still be taken to control oxygen levels in order to prevent explosions
In this case, glass-lined material would be more suitable, as it won’t release metal ions
In terms of corrosion protection and metal ions, enamel is definitely better. However, enamel has poor heat transfer properties, a shorter service life than stainless steel, and cannot withstand impact forces. It needs to be considered comprehensively.
Enameled surfaces offer good resistance to ion contamination; it is reported that ceramic linings as well as titanium alloys are also used. Stainless steel has good impact resistance. The original poster only provided information on the physical properties of these materials, without any details regarding the operating conditions, so it’s difficult to make a determination. As for the issue of additives, you can consult Baoji Ruiko – this company seems to be a relatively professional manufacturer of such catalysts (apparently the largest in China). There are many other manufacturers as well, and they should be able to provide some help
You can directly consult the equipment manufacturer.
1. Enameled reaction kettles do not contain metal ions and are inexpensive. The downside is poor voltage tolerance, and temperatures cannot change drastically. Poor heat transfer performance. 2. Stainless steel reaction vessels may be contaminated with metal ions and are expensive. The advantages are pressure and temperature resistance, as well as a long service life. It does not easily generate static sparks. 3. The two types of reactors should be selected based on a comprehensive consideration of the material properties and reaction conditions.
What the poster described sounds like a hydrogenation reaction; we also use palladium on carbon, and the reaction vessel is made of 316L stainless steel. Check the corrosion manual based on the properties of the material, and then selecting the appropriate material should be fine. The heat transfer performance of enamel is very poor; it’s not clear what the reaction heat effect will be in the case of the material mentioned by the original poster.
We use 21/4CrMo+309, 347L for surfacing
9# wangtiejian Thank you; my reaction is a hydrogenation reaction – the two reactants are added to a methanol solution, and then a palladium-on-carbon catalyst is introduced under high-speed stirring. How is your catalyst added? ?