Vertical, packed-bed, film evaporator for halide-free, silicon-c

Details Vertical, packed-bed, film evaporator for halide-free, silicon-c Vertical, packed-bed, film evaporator for halide-free, silicon-c

1994-12-30

1996-09-24

Miles, Tim R.

Gas separation

With nonliquid cleaning means for separating media

Solid agent cleaning member movingly contacts apparatus

552571, 261 98, 261153, 159 401, 159DIG1, 159DIG32, 159 482, B01F 304

Patent

active

055586872

ABSTRACT:
A vaporizer (film evaporator) (13) for halide-free, silicon-containing liquid reactants used in producing preforms is provided. The vaporizer includes a plurality of packed-bed columns (22) surrounding a central tube (24). A mixture of liquid reactant, e.g., octamethyl-cyclotetrasiloxane, and gas, e.g., oxygen, is sprayed onto the top surfaces (54) of the columns (22) by a set of spray nozzles (32). The liquid reactant and the gas flow downward together through the columns and are heated by hot oil (28) which flows around the columns' walls (50). The liquid reactant evaporates into the gas until the dew point temperature is reached, at which point all of the liquid reactant will have been converted into vapor. The vapor/gas mixture exits the bottom surfaces 56 of columns (22), where its direction of flow changes from downward to upward. This change in flow direction separates higher molecular weight species (46) from the vapor/gas mixture. The vapor/gas mixture leaves the vaporizer (13) through central tube (24) and is supplied to soot-producing burners (20) where it is used to produce preforms.

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