Re.: Chloride Removal

[Deremis]

Hi all

I would like to know what options are commercially available for the removal of chlorides from a hydrocarbon stream as well as a hydrogen rich stream. I need to implement a solution and I would like to ensure that I take into account all possible options.

Are there any vendors that anyone can recommend?

Thank you.

 

[25362]

I've heard of activated alumina and/or activated carbon beds for dry scrubbing on the jobs you mention. As for vendors, catalyst manufacturers may be a good start.

 

[Yordif]

Activated alumina works well for hot, steady state systems as it is mostly a physcial adsorption. This is typically used for the natural gas stream incoming to a steam methane reformer. Equilibrium loading is typically 8-12% by wt. Care must be taken in these systems as changes in state(pressure usually) can cause the equlibrium level to change and it is possible loose chlorides down stream if this occurs.

Promoted alumina is better in that is allows for some chemical absorption as well and can be better with undesirable side change reactions (the formation of organic chlorides or "green oil" polymerization). You may see these in service down stream of a cat reformer for clean up of the hydrogen rich streams.

Mixed metal oxides are all chemical absorption and work well in systems that have state swings. The ultimate capacity on the metal oxides is also considerably higher but they are more difficult to operate. Consideration must be given to the fouling tendency of the hydrocarbon stream as some may be susceptable to fouling by capliary condensation.

 

[Chuck56]

CL-750 is a patented, promoted alumina by Alcoa (

http://www.adcats.alcoa.com)

for chloride removal. A newer version, CL-760, is now available with capacity of 20% by weight (for vapor phase service). Metal oxides cost more.

Iron oxide works well in high temperature service.


Chuck