7/25/2019 Petrovietnam Poster

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WSA TechnologyTurns your off gas into money

The wet gas sulfuric acid (WSA) process is a proprietary development by Haldor Topsoe AS, nominated by EuropeanCommissions as the Best Available TechniqueinDecember 2006. With more than 130 references plant worldwide

since its introduction in the 1980s it has been recognized as an efficient process for recovering sulfur from various

process gases.

Salient Points

A Topsoe WSA plant has lower investment costs

than a Claus plant with Tail Gas Unit.

The most stringent environmental regulations can

be met, even without tail gas treatment

WSA is much simpler than a Claus plant. Neither tail

gas treatment nor sulfur degassing is required.

Widely used to regenerate spent sulfuric acidfrom

Alkylation Unit

Ammonia and hydrocarbons in the feed gas will not

cause problems.

WSA technology is well suited for handling H2S

gases. Also gases with high water vapor content,

such as sour water stripper gas.

Attractive Opex The value of superheated HP

steam and sulfuric acid by far exceeds the cost of

the WSA plant and its operation

Left: WSA plant treating all acid gases and regenerates spent acid. Middle: WSA plant treating all acid gases Right

Integrated WSA with Claus

Superheated

High Pressure steam

Sulphuric acid

WSAClaus

Elemental

sulphur

H2S

SWS

WSA

Superheated

High Pressure steam

Sul huric acid

H2S gas

SWS

Spent acidWSA

Superheated

High Pressure steam

Sul huric acid

H2S gas

SWS

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