Help: Calculating the methanol component production from fresh gas
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With an annual production of 200,000 tons of pure methanol, and assuming 8,000 operating hours per year, the flow rate of fresh gas is 66,000 Nm3/h. The composition of the fresh gas is as follows; based on this, the amounts of each component in the crude methanol are calculated. Components: CO, CO2, H2, CH4, N2; Total sulfur; Composition %.vol: 22.3, 9.5, 64, 3.1, 1.0; ≤0.1 ppm. Steps to solve
The crude methanol component is related to the tower shape, catalyst characteristics, control temperature, catalyst usage time, and trace impurities in the feed gas; it has little relation to flow rate or gas volume
@TH373637, moderator, please help
If element conservation is used, can it be deduced from the volume of gas?
It’s difficult to calculate, as the energy fields and phase equilibria vary, and there are many influencing factors. It is recommended that you consult materials such as the material balance for the relevant process packages
First, carry out a balance calculation of the process materials. For methanol synthesis, there is an imbalance in the materials, with a severe imbalance in the hydrogen-to-carbon ratio; moreover, the inert content in the off-gases is relatively high. Methane and nitrogen are mainly treated in the flare gas, resulting in excessive losses. First, the fresh gas is passed through a PSA unit to remove partial amounts of carbon dioxide, methane, and nitrogen, thereby maintaining a proper hydrogen-carbon balance; afterwards, methane and nitrogen in the vent gas are further processed. My estimate is that the crude alcohol output is less than 40 tons per hour ； The amount of pure alcohol is less than 27 tons but more than 200,000 tons; two-stage concentration and venting may be required. The gas composition is likely to be more similar to that of the gas produced in the first stage of the natural gas carbonation conversion process. I hope we can contribute as much as possible
It’s really hard to calculate, isn’t it? Are there any other components in the wastewater? All various aspects need to be taken into consideration.
It’s very difficult to organize the process using these gas components, and it’s hard to estimate the output
It is difficult to calculate, as it is highly dependent on the catalyst’s selectivity and activity
thank you:lol
This is something that needs to be calculated in the paper, right? I don’t really have any idea how to approach it, but your solution is really good. However, my foundation is a bit weak and I still can’t understand it. Could you please help calculate it simply? Thank you