LPG water removal (again)

[nebulous]

Hello,

This issue has already been raised in three different threads on this forum, but all the provided information on drying of LPG stream was rather incomplete (although some posts are very impressive) and what I am aiming for is a sort of Feasibility Study that would correlate all the major techniques. Specific information on this subject available on-line is also rather scarce (with some exceptions).

I do not suppose any of you can just hand it over but maybe you can recommend a reference that does exactly this: compares these methods thoroughly in some comprehensive manner.

Cheers,
M.

 

[poli60]

which methods have you in mind?

 

[enderlord]

Hi nebulous,

To begin with, you are saying that "This issue has already been raised in three different threads on this forum, but all the provided information on drying of LPG stream was rather incomplete". It would have been very useful if you would have also included a link to the previous discussions on the topic, so we could also read what was previously said.
After that, we could discuss on the subject, and engineers on the forum can share their experience and knowledge. However, you are saying that the information on the three threads are incomplete, what are your expectations from this forum?

cheers,
vlad

 

[EmmanuelTop]

You won't get (for free) a feasibility study on LPG drying prepared by someone else. What you can get for free are advices and opinions from experienced folks around here, if you provide details of your particular application:

1) What is the origin of LPG? Is it more feasible and attractive to dry the stream from which LPG is recovered, or it is better to dry the LPG product only?
2) What is the inlet water content, and what is the maximum allowed water content for the final product?
3) Do you remove water from (presumably) liquid LPG, or gaseous LPG? At what pressure and temperature?
4) Is the process batch or continuous? What volumes/flowrates?

If you are drying LPG stream only, selection of the desiccant will depend on water content specification of the final product. As you have probably read on the forums, Calcium Chloride is not recommended for many operational and safety reasons, which leaves you with Activated Alumina or Molecular Sieve.

Dejan IVANOVIC
Process Engineer, MSChE