Aeration
1977; Linguagem: Inglês
10.1016/b978-0-12-040301-1.50011-7
AutoresGeorge T. Tsao, Young Hie Lee,
Tópico(s)Crystallization and Solubility Studies
ResumoAbsorption of oxygen from air into a fermentation broth is one of the many processes of gas absorption. Other examples may include absorption of ammonia into water, hydrogen into liquid oil for hydrogenation, and sulfur dioxide into caustic solution. While fermentation processes have their unique characters, failure in recognizing the general analog and taking advantage of techniques and theories published in parallel fields can cause unnecessary duplicative work. This chapter discusses the two categories in which the absorption processes can be divided: (1) physical absorption, which involves the dissolution of oxygen into water which involves no chemical reaction, and (2) chemical absorption, which is the sulfite oxidation process involving both the dissolution of oxygen into a liquid and a simultaneous chemical reaction that consumes the dissolved oxygen molecules. Mass transfer through an oxygen diffusion boundary layer on the liquid side of the gas–liquid interface is considered to be the rate controlling step. The phenomenon of oxygen absorption at the gas–liquid interface is that of physical absorption.
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