The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1984
Filed:
Oct. 01, 1981
Chen-Yen Cheng, Albuquerque, NM (US);
Sing-Wang Cheng, Albuquerque, NM (US);
Other;
Abstract
The parallel contact distillative freezing process is an improved distillative freezing process. The distillative freezing process is used in separating a mixture containing at least two volatile components, denoted respectively as A-component and B-component, by simultaneously vaporizing the two components from the mixture under a sufficiently reduced pressure to simultaneously crystalline B-component. The vapor mixture obtained is brought to a condensed state by lowering its temperature a few degrees without substantially pressurizing it. The process may be continued to completely eliminate the liquid phase and bring the mixture into the two phase solid-vapor region. Then, the solid phase is no longer contaminated by the adhering liquid phase and gives a high purity B-component on melting. The parallel contact distillative freezing process is conducted within an elongated processing zone, wherein feed is introduced at one end and the purified B-solid and the low pressure vapor are both discharged at the other end. The vapor, solid and liquid are all transferred in the same direction; the vapor is allowed to interact with the liquid constantly as the vaporization and solidification take place.