Seeking help with several issues regarding catalytic units: desulfurization, solid content in slurry. Fractionation extraction port

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1. Our unit uses N-methyldiethanolamine for both dry gas desulfurization and liquefied gas desulfurization. What is the principle behind the hydrogen sulfide removal in this type of liquid? As far as I know, the rich liquid has to be heated to over 100 degrees in other devices before hydrogen sulfide is desorbed. So the desulfurization process is physical adsorption, right? Rather than a reversible chemical reaction? What is the difference between desulfurization of dry gas and liquefied gas? 2 May I ask what the control target for the solid content in the bottom slurry of your catalytic units is? What about the ash? Here, the solid content is fixed at 6 mg/mL; we conducted a ash analysis, but the ash content can vary significantly even when the solid content remains the same. Why is that? I know that the solid content consists of catalyst and gumbitar, while the ash contains salts dissolved in the oil slurry; moreover, during the measurement process, fine catalyst particles can be lost, leading to errors in ash measurement. So, what is the salt content in the slurry? What is the salt content in the ash? Does anyone have any data to provide? 3 The extraction points of the distillation tower: extraction from the top, extraction from the bottom, or full extraction. What does all this mean? Which are upper extraction, lower extraction, and full extraction? I would be extremely grateful if you could offer some guidance{:1_90:}