After liquefied gas is washed with alkali, can the disulfides in the alkaline solution be removed by stripping?
Thread Content
After liquefied gas is treated with alkali, the alkali solution contains disulfides. Is it possible to remove these disulfides using stripping to achieve alkali solution regeneration? Is this method feasible? I would also appreciate it if my friends could offer some guidance
We extract it using gasoline components with low sulfur content.
The main issue is the lack of gasoline; if it were to be purchased, there would also be the need to deal with gasoline, and the investment in equipment is high
This post was last edited by ylb913 on 2016-12-14 at 19:28. I’ve never seen this before, but the issue of stress corrosion has been discussed quite a lot in Haichuan as well. Using a metal material and then stripping it with steam is something I can’t imagine. Someone suggested using a lining, but I’ve never seen that either.
Hydrogenated gasoline, or diesel, can both be used as extraction oil
This post was last edited by paoying on 2016-12-18 at 10:28. The boiling point of dimethyl disulfide is over 100 degrees, so ordinary stripping methods are likely to not be effective. One can refer to the technology developed by the Sinopec Research Institute; the document available on Douding titled “Zero-alkali slag emission deep desulfurization technology for liquefied gas: treatment from the source, 20160623” describes this technology as being quite effective.
Thank you for the recommendation! The prerequisite for achieving alkali regeneration is the complete conversion of sodium thiolate in the alkali solution into disulfides, followed by the separation of these disulfides from the alkali solution. The principle of using stripping to separate disulfides is sound. The volatility of disulfides depends on their physical properties (Henry’s law constant) and has little to do with boiling point. However, its volatility is poor, and atmospheric-liquid ratio operation is required. If the conversion of sodium thiolate in the alkaline solution is incomplete, even if the disulfides are removed completely through stripping or solvent oil back-extraction, the alkaline solution is not fully regenerated, and sodium thiolate will continue to accumulate; therefore, regular slag removal is necessary to ensure effective extraction.