Methanol sulfur content in methanol after thermal regeneration in low-temperature methanol washing
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Our plant uses the Dalian University of Technology process for low-temperature methanol washing. At present, the total sulfur content in the purified gas is on the high side, ranging from 0.2 to 0.4 ppm. After thermal regeneration, the total sulfur content in the lean methanol is 70 ppm, while the design value is less than 10 ppm. No other problems have been detected for now. Experienced colleagues, could you advise on how to reduce the sulfur content in the lean methanol at the bottom of the C4 tower?
What are your target values? 0.2 to 0.4 is too high; 70 in poor-methanol content isn’t high enough, and 10 ppm is too low
I haven’t encountered a situation where the sulfur content in the four-tower reactor bottom liquid is higher than
It can reduce the amount of concentrated methanol in acidic gases
There’s something wrong with your data, right? The sulfur content in the lean methanol is already at 70 PPM; can the sulfur content in the purified gas be reduced by 0.2–0.4 PPM? 1. Increase the steam supply to the thermal regeneration tower to raise the temperature above 98°C. 2. Slightly reduce the pressure in the thermal regeneration tower. 3. Increase the amount of nitrogen gas. 4. You can also perform a system methanol replacement.
As the original poster said, it’s too detailed! It’s hard to tell; could it be an operational factor?
The data is fine; it’s just that we keep the temperature of the regeneration tower at 101°C, and the pressures in the four towers are not high either. The nitrogen removed by stripping is also significant, at 6,000 units; replacing methanol is not a sustainable solution.
A dirty circulating methanol stream, high ammonia levels, or high water content can all have an impact. To be honest, 70PPM isn’t that high; in my opinion, it’s necessary to check for other factors besides regeneration
Add steam, and check the temperature probes at the bottom of the four towers to see if they are inserted deep enough; the temperatures may not be accurate.
This post was last edited by sdwfsgyykai on 2019-9-5 08:04. Hello, the owner of this post – my company specializes in the production of filters for low-temperature methanol washing processes. I can help address the issue you mentioned; it can be solved through a minor technical modification. I can send you a proposal for your reference.