Wt% MDEA

Question 1

2. Preparing Samples

Answer 1

1. Place 125mL of DI water into 300mL plastic beaker. Place balance on beaker and tare
2. Pipette 1mL of sample into beaker and record weight
3. Repeat steps 1-3 until all samples have been prepared
4. Load 300mL beakers into numbered positions on sample carousel. Place beakers in order listed in table or edit sample table as necessary
5. Assemble titrator with 0.1N sulfuric acid exchange unit locked into 904 Titrando and proper pH probe (6.0210.100) in place. When probe not in use it should be stored in 3M KCl solution

Question 2

3. Programming instrument

Answer 2

Load Tiamo software and click workplace then determination series and sample table with load.
•double click sample to change weight name of sample and position of necessary then click Apply
•start run

Question 3

4. Analyzing data

Answer 3

1. Click database icon, reprocess, and look at Curve Evaluation tab. Only place that has derivative of curve
2. Delete or add endpoints where necessary.
3. The pH of sample at desired endpoint will be approximately 4.8. Verify that inflection and derivative of curve correspond
   Calculations for this test can be done in LIMS or manually with sheets in manual or in titration lab

Question 4

5. Troubleshoot

Answer 4

Probe
•Check correct probe used, and run pH cal if operation is in question (required slope for pH cal is 95-105)
•Clean frit on probe with fresh emery paper and toluene
•ensure probe is being stored in fresh 3M KCl
Titrant
•check that 0.1N sulfuric acid is being used and visually confirm no bubbles

Question 5

1. Purpose

Answer 5

Used for analysis of monoethanolamine (MEA) and methyldiethanolamine (MDEA) in solutions used to remove acid gases, such as hydrogen sulfide and carbon dioxide from hydrogen streams. This test is calculated and reported as wt% MDEA. Procedure assumes alkalinity of plant solution is due to presence of amine.