Atlantic Richfield Company

Lee G Peterman

Raymond J Staebel

Thorpe Dresser

Stanley Ohlswager

Albert G Plys

Edward Czyszczon

A system is disclosed for controlling the environment and temperature in the initial thermal reaction zone of an at least two-zone Claus thermal unit by means of control signals. Both a feed-back control and a feed-forward control are disclosed.

Process for controlling temperature of a Claus sulfur unit thermal

System for temperature control of a Claus sulfur unit thermal reactor

Disclosed is an analyzer for determining volatile composition changes of a distillable material which comprises: (a) a first device for causing at least a portion of said material to be at a temperature and at a pressure so that a difference in temperature of said portion of said material across an isenthalpic expansion at critical flow conditions would be at least about 5.degree. F.; (b) a second device for carrying out said isenthalpic expansion on said at least a portion of said material; (c) a third device for measuring at least two temperatures of said material where said at least two temperatures are a first and a second temperature, said first temperature being measured upstream of said expansion and said second temperature being measured downstream from said expansion; and (d) a fourth device for maintaining pressure downstream of said expansion to a value which does not vary by an amount in excess of about 20% of said pressure downstream of said expansion. The disclosed analyzer can be used in conjunction with equipment useful for processing distillable material into various boiling fractions. Disclosed also is a particular application for the analyzer in an online configuration for refining of petroleum crudes.

Analyzer for distillable materials

An improved Claus tail gas recovery process involving stoichiometric combustion of a hydrocarbon gas when the hydrocarbon gas composition is not constant.

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Flossmoor, IL, United States of America

Lee G Peterman