Patent · US Expired

Pressure testing of catalyst loaded reactors

US4064036A · kind A · utility

5Cited by
4References
9Claims
0Family size

Assignee

Inventor

Key dates

Filing dateOct 14, 1976
Grant dateDec 20, 1977
Priority date—
Expiry dateOct 14, 1996

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC10G49/24
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

In the pressure testing of catalyst-loaded reactors with nitrogen gas at elevated temperatures, it is found that certain types of zeolite catalysts are substantially degraded in activity. The catalysts concerned comprises a Group VIII noble metal in an oxidized state, dispersed on a crystalline hydrogen zeolite, e.g., Y zeolite. It has now been discovered however that if such catalysts are first prereduced with a dilute, non-combustible mixture of nitrogen and hydrogen, damage on subsequent pressure testing with nitrogen is prevented or drastically reduced. Following pressure testing, the catalyst is activated by dehydration in a stream of hydrogen at elevated temperatures and pressures.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.