Analysis of the reasons for unsatisfactory sulfur content in liquefied gas
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In our facility, the liquefied gas desulfurization process involves alkaline washing with two-stage fiber membranes, followed by water washing. The alkali solution regeneration system does not use naphtha to extract disulfides. The liquid hydrocarbon feed rate is 8.5 t/h, and the circulation rate of the alkaline solution is 4 t/h. With an alkali solution concentration of 15%, there are basically no issues with operation. The sulfur content before alkali washing was 2800 mg/m3; after the first stage of alkali washing, it was 1500 mg/m3, and after the second stage, it was 600 mg/m3. The differential pressure for the first stage of alkali washing was 15 kPa. I would like to ask experienced experts: what is the cause of the issue with the unsatisfactory sulfur content in our device? If there are anyone in the same industry, could you please share your DCS operation diagrams? My email address is wangjunqing@tdnrc.com.
The sulfur content at the inlet is too high, 5 to 10 times that of ours.
Has it been analyzed to determine what components it contains? Take a look at the analysis results; if it’s inert sulfur, double desulfurization cannot handle it here. .
Is not ethanolamine desulfurization carried out before alkaline washing? ? ?
Because your alkali regeneration system does not use naphtha for the extraction of disulfides, and the sulfur content in the raw material is high. In my opinion, if the regeneration effect of the alkaline solution is not good, it is possible to regularly cut the disulfides inside the oxidation tower to observe the resulting effect
Go and check what form sulfur is in – organic sulfur or inorganic sulfur