| 摘要 |
It is necessary in many heat treatment processes conducted in open systems to maintain a given partial pressure of a volatile component of a material being treated, and it is desirable to conserve this volatile component, both on account of cost and in the case of components such as mercury, toxicity. A controlled unsaturated vapor pressure of a volatile liquid 28 may be produced in a tube 3 by passing a stream of a carrier gas through a vaporizer 4 containing the liquid 28 at a temperature Ts, passing the mixture of the carrier gas and vapor of the liquid 28 through a tube 3 containing material 29 to be treated, which material 29 is at a temperature Tt. The mixture of the carrier gas and vapor of the liquid 28 is then passed to a condenser 6 from which the carrier gas is vented to waste, and the vapor of the liquid 28 is condensed at a temperature Tc in the condenser 6. Tt>Ts >Tc. The condensate passes from the condenser 6 to the vaporizer 4 through a tube 12, and the liquid 28 fills a cross-section of a length of the tube 12. |
