i v N e t P a t e n t . ~

wherein the equilibrium dissociation pressure characteristics of one or both of the first and second metal hydrides in a given operating unit differ from those of one or both of the first and second metal hydrides in at least one other operating unit.

4524049

P R O C E S S F O R C O N C U R R E N T S T E A M G E N E R A T I O N A N D

M E T A L R E C O V E R Y

Song-P Sit, Calgary, Canada assigned to Zimpro Inc

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Vanadium and nickel are recovered from fluid coke or fly ash concurrently with cogeneration of steam by a wet oxidation process at 500 degrees- 650 degrees F. and elevated pressure, with a leaching pH ofapproximately 0.3 maintained by generation of sulfuric acid in situ. Vanadium products are precipitated by oxidation with for example sodium perchiorate with concurrent or subsequent pH adjustment to about pH 2. Fol- lowing separation of the vanadium pentoxide, nickel powder is preferentially recovered by reduction with hydrogen and ammonia. Steam is generated by recovery of the thermal energy pre- sent in the offgases.

4524587

R O T A R Y T H E R M O D Y N A M I C A P P A R A T U S A N D M E T I I O D

Frederick W Kantor

A rotary inertial thermodynamic absorptive sys- tem which can be used as a gas-driven heat pump, a heat-flow-driven gas pump, or, in com- bination, a heat splitter for moving low-grade

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heat energy from a lower temperature source to a higher temperature heat sink. In one embodi- ment, an absorptive type rotary inertial thermo- dynamic device employs overspill/underspill barriers in its absorption and desorption cham- bers to achieve counterflow heat exchange there- between and to ensure effective control of thermodynamic impedance.

4524752

R E C U P E R A T O R

Beresford Clarke

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L : _ - ' ~ r t . - - l l An improvement in negative pressure radiant tube type fuel burner systems is disclosed wherein a heat recuperator in the form of a con- centric conduit arrangement for conveying air from the atmosphere to a burner unit extends in- wardly into the exhaust leg of the radiant tube so that combustion air for the burner is diverted along generally parallel oppositely directed coaxial paths into and out of the radiant tube to transfer heat from exhaust gas to intake air. The recuperator is made to be free floating within the radiant tube so as to minimize the chance of structural damage due to thermal expansion and a series of radial pins may be employed in con- junction with the recuperator to support the con- duit arrangement, and increase heat transfer to incoming air.