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Questions tagged [process-chemistry]

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18
votes
3answers
2k views

What happens to the argon in the Haber-Bosch process?

The Haber–Bosch process is used to synthesis ammonia from atmospheric nitrogen and hydrogen derived from a hydrocarbon such as methane. The process requires high temperatures and pressures and also ...
13
votes
3answers
10k views

Why is the Haber process carried out at such high temperatures?

On a large scale, ammonia is prepared via the Haber process: $$\ce{N2(g) + 3H2(g)->2NH3(g)} \qquad \Delta _\mathrm{f}H^\circ = -46.1~\mathrm{kJ \cdot mol^{-1}}$$ The optimum conditions for the ...
3
votes
1answer
1k views

What is the difference between an industrial and a laboratory production method?

I'm not sure if this is the correct SE in order to ask this, if that is true just said me that in comments and I will delete my question, there is no need of downvote or ban. I was answering a ...
2
votes
1answer
44 views

Are there still “prairie dog refineries”?

In the old days (meaning the 1940s) there still many small "prairie dog" oil refineries, that were little more than a bunch of hooch stills soldered together, but from what I understand these are all ...
2
votes
1answer
40 views

Sudden pressure rising in a pipe of an old plant transporting 33% ammonia solution

We pump 33% ammonia solution along a single pipe line before we introduce it to the mix. We've had two occasions now where the ammonia pressure has rapidly risen in the pipe. It happens when the fluid ...
2
votes
0answers
20 views

How to control pH in a fermenter based on the acid produced by mircoorganism

I have got a bioreactor with an aqueous medium which produces biomass (yeast; S.cerevisiae) after inoculation. I am observing and collecting data over the whole process via probes/etc. on different ...
1
vote
2answers
92 views

Working with typical glass: What temperatures would I be dealing with?

I want to be able to melt down typical glass (the kind you usually find at home) and mold it into other shapes. What temperatures would achieve this? For comparison; if I were to take some sand and ...
1
vote
0answers
24 views

Calculating the effects in a fractionating column

Consider a fractionating column used to separate a mixture of acetone (A) and toluene (B) with a liquid molar composition of acetone called x. The feed is F, the distillate is D, the waste is W and ...
0
votes
2answers
52 views

Why is it so hard to turn plastics into something useful or decompose it? [closed]

Even after so many years, why haven't we yet come up with a solution to the plastic problem ? Why are plastics so hard to decompose via chemical or physical processes into something harmless or ...
0
votes
1answer
2k views

How is the process of converting calcium carbonate (CaCO3) into calcium oxide (CaO)? [closed]

I need to provide accurate information in relation to the production process of calcium oxide from calcium carbonate. $$\ce{CaCO3 -> CaO + CO2}$$
0
votes
1answer
160 views

Mass transfert in process chemistry engineering, two film theory

I'm having troubles to understand a part of my lesson. I have no idea where to ask my question, but it is consider as chemistry so here we go. Let me introduce some notations : $x$ and $y$ ...
0
votes
2answers
402 views

Separation of sulfur dioxide and sulfur trioxide in the contact process

When gases leave the catalytic reactor in the contact process of sulfuric acid generation, both $\ce{SO2}$ and $\ce{SO3}$ will be present. According to descriptions I have read, the trioxide reacts ...
-1
votes
1answer
1k views

Heating a mixture of methanol and water?

I have a mixture methanol and water, at 25°C, and I want to take it to 250°C. I'll use two heat exchangers: one for taking the mixture from a liquid state (25°C) to a vapor state (X°C), and the second ...