Stripping steam usage

While Figure 18.3 provides an overview of the balanced steam flows. Table 18.4 gives a breakdown steam for four process areas as cost centers A, B, C, and D. Some of the steam usages have no condensate return and these users include stripping... 

Finishing. The halogenated rubber solution then passes into a vertical drum where the solvent is flashed and stripped by steam and hot water. Calcium stearate is added to the slurry in this drum to prevent polymer agglomeration. A second vessel in series provides additional residence time for the solvent to diffuse from the ruhher and be vaporized. The final solvent content and the steam usage for solvent removal depend on the conditions in each vessel. Typically, the lead flash drum is operated at 105-120°C and 200-300 kPa (29-43.5 psi). Conditions in the final stripping stage are 101°C and 105 kPa (15 psi). The hexane can be reduced to 0.5-1.0 wt% with a steam usage of 2.0-2.5 kg/kg rubber. 

---