Pressure testing of catalyst loaded reactors

Details Pressure testing of catalyst loaded reactors Pressure testing of catalyst loaded reactors

1976-10-14

1977-12-20

Scovronek, Joseph

Mineral oils: processes and products

Chemical conversion of hydrocarbons

73 492, 73 493, 208140, 208111, 252455Z, 23230L, B01J 2914, G01M 304, G01N 3110, G01N 3300

Patent

active

040640361

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.

REFERENCES:
patent: 3201356 (1965-08-01), Kress et al.
patent: 3213013 (1965-10-01), Arey, Jr. et al.
patent: 3800586 (1974-04-01), Delatorre
patent: 3921436 (1975-11-01), Plegat

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