Liquid purification or separation – Processes – Separating
Patent
1994-05-04
1995-11-28
Spear, Frank
Liquid purification or separation
Processes
Separating
210634, B01D 3502
Patent
active
054704871
ABSTRACT:
A cap for sealing pressure vessels is disclosed. The present invention permits a nominal closure to be formed by hand tightening and a substantially higher force to be applied to a cap by a separate clamp mechanism, thereby forming a pressure seal. In certain preferred embodiments, means for providing a process flow through a hole in the seal and filtering means are also provided as part of the cap assembly. A preferred application of the cap of the present invention is for the sealing of sample vessels used for supercritical fluid extraction of compounds from a solid matrix for subsequent chemical analysis. Methods of supercritical fluid extraction are also disclosed. The present invention thus provides methods and apparatus whereby the placement of a sample into a pressurized system may be automated and monitored to ensure adequate seals have been created and maintained within such pressurized systems.
REFERENCES:
patent: 3842574 (1974-10-01), Dickey
patent: 4569161 (1986-02-01), Sherman
patent: 4635728 (1987-01-01), Harrington
patent: 4694975 (1987-09-01), Hagan
patent: 4816159 (1989-03-01), Khosah et al.
Bristow James A.
Murphy Gregory E.
Noronha Anil P. F.
Staats, III Louis T.
Hewlett--Packard Company
Schuette Richard F.
Spear Frank
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