CANSOLV process

The Cansolv process, Hcensed by Union Carbide Corporation, features an aqueous solution of a proprietary amine to absorb the sulfur dioxide. 

FIGURE 16.10 CANSOLV process chemistry. (With permission from CANSOLV Technologies.)... 

Basic Data, 590 Sulphidine Rnocess, 591 ASARCO Process, 593 CANSOLV Process, 595 Dow Process, 596... 

Four processes that remove sulfur dioxide from gases using amines are described here. These are the Sulphidine, ASARCX), Dow, and Union Carbide processes. The Sulphidine process was operational prior to World War II while the ASARCO process has been commercial since the late 1940s. Both the Dow and Union Carbide s CANSOLV processes are more recent developments which use proprietary amines. 

An economic study by an independent engineering firm, commissioned by Union Carbide, compared the CANSOLV FGD process to five other commercial processes. Ibe processes compared were the co-current wet limestone, jet bubbler, countercurrent wet limestone, dry lime, and Wellman-Lord processes. The study showed that the economics for the CANSOLV process can be very favorable when compared with limestone processes in higji sulfur applications (Hakka et al., 1991). 

Although initial results were promising. Union Carbide has discontinued the development of the CANSOLV process based on their assessment that the current market does not justify further development and because of the significant investment that would be required (Barnett, 1993). 

Cansolv A "flue-gas desulfurization process based on the selective absorption of sulfur dioxide in certain amine-based organic solvents. Developed by Union Carbide Corporation the first plant was planned for startup at Newburgh, IN, in 1994. See HS. 

HS A family of gas purification processes developed by Union Carbide Corporation, based on the use of proprietary solvents known as UCARSOLs. UCARSOL HS-101, is based on methyl diethanolamine and is used for removing hydrogen sulfide and carbon dioxide from other gases. Ucarsol LH-101 is used in its Cansolv system for flue-gas desulfurization. 

Both of these processes direct the SO2 absorbed from the FCCU flue gas to the refinery SRU, where it is converted to elemental sulfur and added to the marketable sulfur that is generated by the SRU from H2S. Alternately, the SO2 can be converted to sulfuric acid in a dedicated sulfuric acid plant, or in combination with an existing refinery spent acid regeneration unit. When the SO2 is directed to the SRU, 1 ton of SO2 captured in the scrubber is converted to 0.5 tons of marketable elemental sulfur and less than 0.1 ton of sodium sulfate waste is generated per ton of SO2 absorbed. In an acid plant, 1 ton of SO2 generates 1.5 tons of 98% sulfuric acid. Steam is also generated from the conversion of SO2 in both the SRU and the acid plant, which moderates somewhat the steam consumption rate of the solvent regenerator for both the LABSORB and CANSOLV systems. 

CANSOLV is an amine based regenerative scrubbing technology. It was originally developed by Union Carbide and acquired by Shell Global Solutions in 2008. The technology uses a unique amine to absorb SO. The process chemistry is outlined in Figure 16.10. 

The process diagram illustrates a typical flowscheme for the CANSOLV SO2 Scrubbing System. In it, gas is shown to leave the FCCU battery limits at a hot and dry condition. While a CO boiler and ESP are shown, the FCCU system may... 

The Union Carbide CANSOLV pirocess is a relatively new FGD process that produces SO2. It utilizes, a proprietary, thermally regenerable organic amine-based solution, UCAR-SOL Absorbent LH-201, which is non-volatile, stable oxidatively and thermally, and designed to meet applicable health and safety standards. A pilot plant at Suncor Inc. s oil sands plant at Fort McMurray, Alberta, Canada, treated 7,000 acfm of flue gas from boilers burning 7% sulfur petroleum coke (Hakka and Barnett, 1991). 

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