5 replies to this topic

[normal2500]

i have stream with light oil component

hydrogen, Methane, Ethane, H2S this in gas phase
Propane, Iso-Butane, n-Butane, iso-pentane, n-pentane in liquid phase

what i need from this stream is Propane, Iso-Butane, n-Butane, iso-pentane, n-pentane

my Question
can i use distillation column to separate thim so i get hydrogen, Methane, Ethane, H2S and some of propane

is there any problem by using distillatin column because i get H2s with the feed

i am thinking to treat the H2S after it distill with other gases


persantage of H2s is 0.1%

[mbeychok]

normal2500:

It is completely acceptable to do your distillation first and then remove the H2S from the overhead gas product of the distillation.

If you are not interested in retaining propane in the distillation bottoms liquid product, then you are talking about what is commonly known as a depropanizer and you can use an ordinary distillation tower operating at about 10 to 13 atmospheres presure and 310 K temperature (depending on the cooling water supply temperature for the overhead condenser ). The overhead product gas will contain some of your butanes, almost all of your propane and all of your ethane, methane and H2S.

If you are interested in retaining about 70% or more of the propane in the bottoms product, then you will need to operate at about 15 to 20 atmospheres and use what is commonly known as a reboiled de-ethanizer or a reboiled absorber system ... which is a good bit more complex than a simple depropanizer.

[normal2500]

Thanks for your answer.

can i ask you another question

After i spreat the gases what is the beat and industrial way to separate the H2S from the other Gases.

[mbeychok]

normal2500:

Most large oil refineries use aqueous solutions of either diethanolamine (DEA) or monoethanol amine (MEA) to remove the H2S and recover it as a concentrated stream of H2S gas. Those processes are called "amine sweetening". The concentrated H2S is then fed to a Claus process which converts the H2S to elemental sulfur.

Visit http://www.bre.com/p...esweetening.asp for a process description and for a flow sheet of the amine process.

[Mr. Biswajit Mandal]

First use a water scrubber to separate hydrogen sulphide gas then go for membrane separation.

[normal2500]

another Q and sorry

whan i use Zinc Oxide to remove H2S, can i use Hysys
or i do hand calculation