Patent ID: 8921119
Filing Date: 2014-12-30
Classification: B01J,H05B,Y10T

Abstract:
1. A method of high pressure high temperature chemistry comprising: digesting a sample in a strong acid at a temperature of at least 200° C. in a pressure resistant vessel having a vessel lip with an inner circumferential oblique surface and an outer circumferential oblique surface, a lid having an inner circumferential oblique surface and an outer circumferential oblique surface that respectively engage the oblique surfaces of the vessel lip, and a retaining ring surrounding the lid at the position where the oblique surfaces meet; while exerting a defined force against the lid in order to maintain gases under pressure in the vessel; directing gas under excess pressure from the vessel into a circumferential passage defined by an open channel in the pressure resistant lid and a bottom wall formed by the vessel lip; and directing the gas from the circumferential passage outwardly from the lid while preventing gas from flowing outwardly over the edge of the vessel between the outer oblique surface of the lid and the outer oblique surface of the vessel lip.