Alkacid process

H. Baehr, Gas Purification by the IG Alkacid Process and Sulfur Recovery by the IG Clauss Process , Refiner Natural Gas. Manuf, 17 [6] 237-44 (1938). 

Alkazid A development of the Alkacid process. The absorbent is an aqueous solution of the potassium salt of either methylamino propionic acid (Alkazid M) or dimethylamino acetic acid (Alkazid DIK). Developed by Davy Powergas, Germany. Over 80 plants were operating in 1975. 

The U.S. Bureau of Mines studied the process to evaluate the Alkacid dik solution as a selective absorbent for hydrogen sulfide in the presence of carbon dioxide, and the results were compared with those of other absorbents tested in the same apparatus. The solution capacity of the AUcacid solution tested has been compared with that of the 35% tripotassium phosphate solution in Figure 5-44, which demonstrates the effect of the CO2/H2S ratio on the absorptive capacity of both solutions. It will be noted that the Alkacid solution takes up appreciably more H2S particularly at low CO2/H2S ratios. Although its capacity is higher, the Alkacid solution was found to be somewhat less selective than tripotassium phosphate. 

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