Triazine

Formaldehyde

HSO 6869

Sediment

Appears in some cases

Appears always. Equipment clogging problem

None

Extraction efficiency

70%

90%

100%

Excess

unreacted scavenger

May cause fouling and corrosion, high aquatic toxicity

Potential to create explosive environment

Can be safely disposed with water

Reaction products

Dithians + free amines, changes pH severely

Dithians, polymethylene sulphides

Water soluble sulfate salts

Toxicity

Toxic

Extremely Toxic

Safe

Reaction time

2 hours and more

2 hours and more

immediate

Stability

Unstable, pH change breaks down scavenged molecules

H2S may come back by reverse reaction

Irreversible reaction, water soluble reaction products

Ethyl mercaptane extraction

incomplete

Reacts weakly

Fully

Removal Requirements

20:1

10:1

5:1

Odor

strong

pungent

none

Other consideration

May cause mineral scaling, problematic for refineries

Forbidden

in EU, USA

REACH and CEFAS certified