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Case History 314

Case History

Natural Gas Processing Plant

S Optimization Program ENVIRO-SCRUB LM



Background

A natural gas processing plant was treating a

stream with high H

S content using

competing H

S scavenging technologies.

In this system, H

S is removed by sparging

the gas through a scavenging chemical

solution in the sparge contactor. Once the

S monitor at the contactor outlet reaches a

breakthrough point of 4ppm, the chemical

solution is replaced.

The plant was looking to increase the run-

time between change-outs, thereby reducing

down time, maintenance, and chemical

costs. Prior to Q

Technologies’

involvement, four different H

S scavenger

technologies were tested with varying

results. The run-time between change-outs

for these trials ranged from 7 to 25 days.

System Data

Gas production: 126 SCFM average

Inlet H

S: 1,300 ppm

Outlet H

S: <4 ppm

Pressure: 200 psig

Solution

Technologies ran three separate trials

with Enviro-Scrub

LM, using a different

mix ratio for each test.

In the first trial, a mixture of Enviro-Scrub

LM and methanol achieved a 24-day run.

The second trial used Enviro-Scrub

with no dilution, and runtime increased to 28

days.

At this point an analysis of the replaced

chemical revealed that much of it was un-

reacted.

The treatment program for the third trial was

optimized by diluting Enviro-Scrub

with water. The resulting chemical

consumption rate was 100%, theoretical, and

the run-time achieved with this optimized

trial was 27 days.

Results

Enviro-Scrub

LM delivered longer runs

than any other H

S scavenging technology

tested.

Based on an average of 20 days between

chemical change-outs with competitive

programs, Q

Technologies achieved a 35%

increase in run-time, and a 35% reduction in

change-outs per year.

With the Enviro-Scrub

LM solution,

savings include less lost production, as well

as reduced maintenance and chemical

disposal costs.

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Case History 314Case HistoryNatural Gas Processing PlantH2S Optimization Program ENVIRO-SCRUB LMBackgroundA natural gas processing plant was treating

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