Double contact acidmaking

Double contact acidmaking oxidizes its S02 more completely to S03 than single contact acidmaking. For this reason it ... 

The process is called double contact acidmaking because gas and sulfuric acid are contacted twice, steps (b) and (d). 

Double contact acidmaking always gives more efficient S02 + AO 2 - S03 oxidation than single contact acidmaking. This leads to ... 

Fig. 19.2. Double contact acidmaking flowsheet with numerical values used in this chapter s calculations. The plant consists of 3 catalyst beds followed by intermediate H2S04 making and a 4th catalyst bed. The gas from the last catalyst bed goes to cooling and final H2S04 making (not shown). All kg-mole values are per kg-mole of 1st catalyst bed feed gas. Gas pressure = 1.2 bar, all beds.

Section 19.7 shows that 3 - 1 double contact acidmaking has oxidized ... 

Double contact acidmaking is more efficient than single contact acidmaking. However, this extra efficiency comes with extra costs. They are for ... 

Widespread industrial adoption of double contact acidmaking indicates, however, that the high efficiency of the process more than offsets these extra costs. 

This chapter uses the latter calculation to analyze double-contact acidmaking. Its objectives are to ... 

This is called double contact acidmaking because it contacts gas and acid twice, steps (b) and (d). The advantage of double contact acidmaking is that it makes SO3 and H2S04(.() more efficiently than single contact acidmaking. 

---