6 replies to this topic

[PKS]

Hello Members!!

 

I have a question, 

 

How to prepare Amine (either MDEA, DEA etc) solution? Mixing it with potable water, Demineralized water or Boiler feed water?

 

In some plant I have seen potable water being used as diluting medium and in other plant i have seen the use of Demineralised water. 

 

Please shed some light on this.

 

PKS

[jamescarter]

hi..

 

    Combining amines can be the best means for improving potential or enhancing efficiency in an amine sweetening device. In many situations, it may be possible basically to add a second amine to the current remedy "on the fly," or as the product is operating.

Union Hawaiian Resources' Bryan, Tex., gas place provides one example. The place was transformed from diethanolamine (DEA) to a DEA/MDEA (methyl DEA) combination after research by SWEET, a process-simulation system.

After transformation, CO2 stages in the revenue gas dropped to less than direction requirements. Information were taken for the absorber at a continuous amine flow of 120 gpm. A evaluation of the efficiency data to the measured by the system shown the precision of SWEET.

[PKS]

@Jamescater

 

Please re-read my question.

 

PKS

[narendrasony]

Dear PKS,

Boiler feed water is generally not acceptable due to additives which can cause foaming.  Good quality process water (DM water) with conductivity of less than 15 micromhos and a pH of 7 to 7.7 can be used.  Typical quality standards for water (as per one of the reputated amine supplier): 

 

                                    Total dissolved solids < 100 ppmw

                                    Total hardness             < 50 ppmw

                                    Chlorides (Cl)             < 2 ppmw

                                    Sodium (Na)               < 10 ppmw

                                    Potassium (K)             < 10 ppmw

                                    Iron (Fe)                      < 10 ppmw

 

Solution prepared with potable water may eventually lead to chloride stress corrosion of stainless components. There is a limit of 500 ppm for heat stable salts in chloride form.

Hope it helps.

 

Regards

Narendra

[PKS]

Thanks a lot Narendrasony!!

 

That was what I needed. 

 

Narendra, please share some reference document or you may email me : createrme@gmail.com

 

Thanks in advance

 

PKS

[PKS]

Hello Members

 

Any more suggestions/options.

 

PKS

Edited by PKS, 29 May 2014 - 04:41 AM.

[RockDock]

Potable water may be suitable if there is sufficient filtration of the solution. However, I would use DM water.

 

Imagine a cooling tower you see at any large building or industrial plant. If you look closely at the tower material you will see calcium and other deposits. Those towers use potable water. They also have to dump their water after just 3 cycles, due to salt accumulation. That is exactly what you would see on the column trays if potable water with insufficient filtration is used.

 

You will need filtration for the amine solution, anyways. So, you need to place your filters just downstream of the water inlet if you use potable water. However, you also need to place your filters on the rich side of the plant. You will need to see what options you have available at your plant and make a decision based on that.