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It is possible to convert CO2 to CH4 using H2 over a NiO catalyst as in the purification step of ammonia synthesis gas. However, we are talking about CO2 concentration in ppm level and that too the process involves operating the system above a minimum temperature of 250 degC. However, for the...

I agree with quantum1. There are also different types based on the principle of separation - like Gravity type, cyclonic type & demister type. You can also refer well known - Chemical Engineering design book written by E. Ludwig (title I am not so sure..) for further reference. Also Chemical...

It is most probably that the increased ammonia level caused the tube failures and not otherwise. I have observed this phenomenon in low pressure steam line in a ammonia plant - though I am not sure about the exact mechanism that causes this failure.