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Handbook of Solvents - George Wypych - ChemTech - Ventech!

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22.2 Solvent recovery 1553<br />

Figure 22.2.11. Flow diagram <strong>of</strong> tablet binder recovery process.<br />

22.2.6 ENERGY RECOVERY FROM WASTE SOLVENT<br />

Table 22.2.9. Specifications <strong>of</strong> the VOC<br />

oxidation unit<br />

Type <strong>of</strong> unit Direct firing<br />

Total gas flow rate 2,000 kg/h<br />

Solvent flow rate 160 kg/h<br />

Solvent Acetone, methanol, IPA<br />

Feed temp. 60 - 100°C<br />

Oxidation temp. 800 °C<br />

Performance, THC meter 97 %<br />

Table 22.2.10. Specifications <strong>of</strong> the waste<br />

heat boiler<br />

Type <strong>of</strong> unit Horizontal, multi-tube<br />

Use for Steam as heating medium<br />

Waste gas flow rate 5,000 Nm 3 /h<br />

Temp., waste gas Inlet: 800, outlet: 350°C<br />

Supply water temp. 20°C<br />

Steam generated 1,300 kg/h<br />

Supplemental fuel Heavy oil, max170 l/min It is not always economically justified to recover<br />

solvents if they are at very low concentrations<br />

and in mixtures. It may be more<br />

economical to burn the solvent blend in a boiler to save fuel. Tables 22.2.9 and 22.2.10 contain<br />

the specifications <strong>of</strong> industrial combustion units.

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