Title: Catalyst regeneration

Abstract: A system for controlling the addition of small amounts of material to process using the loss-in-weight method. The system uses digital control in combination with an on-off solenoid valve whose on time can be varied to meter the material uniformly at low rates.

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Inventors: Szakasits, Julius J. (Houston, TX, US)
Wadham, Thomas C. (Cypress, TX, US)

Application Number: 935196
Filing Date: 1978-08-21
Publication_date: 1980-07-08
Assignee: Shell Oil Company (Houston, TX)
Primary Class(es): 222/3 222/58, 502/6, 700/266, 702/173
Other Classes:
US Patent Ref:

3195776	Jul, 1965	Helm et al.	222/76.
3481509	Dec, 1969	Marhaver	222/58.
3800794	Apr, 1974	Georgi	222/76.
3822723	Jul, 1974	Crowell et al.	222/76.
3855458	Dec, 1974	Motter et al.	364/567.
4073628	Feb, 1978	Gernhardt et al.	222/58.
4094817	Jun, 1978	Olson et al.	252/415.

Other Refs:
Primary Examiner: Scherbel, David A.
Assistant Examiner: Wacyra, Edward M.
Attorney: