Dipa

Known technology Low cost (approximately $1.6/kg) Simple regeneration. 20-30% solution has low freezing point (to —50°C).

Known technology. Low cost.

Simple regeneration.

Better H2S selectivity than MEA.

Known technology.

Low cost (approximately $1.4/kg).

Simple regeneration.

Highly selective to H2S.

Less degradation.

40% solution has reasonable freezing point (—32°C).

Highest selectivity to H2S. Lowest regeneration temperature;

hence energy savings. Lower heat of reaction Lower corrosion effects. Low vaporization losses. Not degraded by COS or CS2. Higher initial costs are offset by reduced make-up costs.

Some degradation by CO2, COS, and CS2 requires use of make-up.

May need addition of foaming prevention agents.

Some corrosion effects.

Some degradation.

Slightly higher cost than MEA.

May need foam prevention agent.

Approximately twice as expensive as MEA, based on adsorption capacity.

Minimum (fluid) operating temperature is higher than for MEA.

Higher initial cost for amine. If an MDEA or DIPA regeneration plant is not nearby, a regeneration unit is required.

are used, and efficiencies as high as 90% can be attained for streams containing 1.50% H2S and 0.75% SO2. Similar technologies are used in the cold-bed adsorption process, developed by AMOCO Canada Petroleum Company Ltd., and the MCRC sulfur recovery process, licensed by Delta Engineering Corporation (USA). Sulfur recoveries up to 99% are attainable for each of these processes.

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