Precise desulfurization of liquefied gas
Thread Content
Xiaobai seeks help: Regarding the precise desulfurization of liquefied petroleum gas, how to achieve a total sulfur content that meets national standards
It is known that desulfurization of liquefied gas using alcohol can reduce thiol levels while also lowering the total sulfur content to several dozen ppm.
But I’ve also looked into this method; it’s the standard practice in refineries. However, the total sulfur content in the raw materials used by others is 1000–2000, or even more, as the raw materials vary!
:'(Have you guys encountered the same problem too?
Our raw material typically contains less than 300–500 ppm, with a maximum of 700 ppm, and that’s not a problem. The key is to know what forms of sulfur are present in the total sulfur. In refineries, as far as I know, as long as the thiol compounds are removed (to levels of a few ppm), it is generally possible to ensure that the total sulfur content remains below 30 ppm.
There is zinc oxide desulfurization, which is a solid-phase process; the reaction is almost irreversible and the degree of desulfurization is very high. Liquid-phase desulfurization is typically achieved using DMDS, N-methyldiethanolamine, for leaching out sulfur compounds. Desulfurizing thiols is more difficult. However, many refineries in China use fiber membrane contact methods to remove thiols from gases, usually after the DCC FCC unit. You can look up more information on the detailed principles; let’s learn together as well*
Well, we use refinery liquefied gas as the raw material, along with refinery fiber membrane technology. I’m not sure if it will meet the requirements; it would be great if we could achieve levels of several dozen PPM. Let’s see if we can simulate that condition
One major issue is that we are dealing with liquid-liquid contact desulfurization; there is a lot of information available on gas-solid phase desulfurization, and it’s also easy to carry out. Fiber membranes have indeed been identified in this context, so I’ll check to see if it’s possible to simulate this process.
If liquefied gas is in the liquid phase, the pressure also increases. Then why is pressurization necessary? Even if it can be simulated, there’s no need for industrial application, right? Energy consumption will surely increase as well
No, we use liquefied gas as the raw material; it comes from storage tanks and is in liquid form, and it needs to be desulfurized.