Vacuum freezing ambient pressure melting (VFAPM) process and sub

Details Vacuum freezing ambient pressure melting (VFAPM) process and sub Vacuum freezing ambient pressure melting (VFAPM) process and sub

1987-01-12

1989-03-07

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62532, 62542, F25J 500

Patent

active

048102741

ABSTRACT:
A new vacuum freezing separation process entitled "Vacuum Freezing Ambient Pressure Melting (VFAPM) Process" and a new apparatus entitled .cent.Sub-Triple Point Vapor Processing Unit" for generating and liquefying a sub-triple point vapor have been introduced. The process is useful in desalination, concentration of industrial solutions, water reuse and pollution abatement. The vapor processing unit can be used in vacuum freezing processes, distillative freezing processes, freeze-drying processes and other processes in which sub-triple point vapors are generated and are to be liquefied.
The VFAPM Process is conducted in two processing zones, a vacuum processing zone and an ambient pressure processing zone. A vacuum freezing operation of generating a first vapor (a sub-triple point vapor) and a first condensed mass containing solvent crystals and a two-stage liquefaction of the first vapor are conducted in the vacuum processing zone; a crystal washing operation and a crystal melting operation are conducted in the ambient pressure processing zone. The Sub-Triple Point Vapor Processing Unit is an apparatus for generating a sub-triple point vapor and subjecting the vapor to a two-stage liquefaction operation involving a desublimation operation and a desublimate melting operation. The VFAPM Process is insensitive to corrosion, scale formation and fouling problems. It can handle many chemicals and solutions and it can attain a high degree of concentration of various industrial solutions and polluted solutions.

REFERENCES:
patent: 4378984 (1983-04-01), Cheng et al.
patent: 4451273 (1984-05-01), Cheng et al.
patent: 4489571 (1984-12-01), Cheng et al.
patent: 4505728 (1985-03-01), Cheng et al.
patent: 4578093 (1986-03-01), Cheng et al.

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