This invention pertains to processes and compositions for scavenging sulfhydryl moieties such as hydrogen sulfide from hydrocarbon streams, especially gas streams.

In a premixing apparatus that mixes a fuel gas with air and supplies an air-fuel mixture to a burner through a fan, includes a main valve, a zero governor, and a variable throttle valve which are interposed from an upstream side downward in sequence in a gas supply passage, of which an downstream end is connected to a gas suction part that is provided in an air supply passage on an upstream side of a fan, and carries out a first control that regulates an opening degree of the variable throttle valve so that an excess air ratio of the air-fuel mixture, which is indexed based on a flame current that is detected by a flame rod which is exposed in flames of the burner, and a second control that, at time of a post-purge operation, if the flame rod detects the flame current, it will be decided that an open trouble of the main valve occurs and the opening degree of the throttle valve will be tightened till a minimum opening-degree which is set so that the burner is extinguished.

An apparatus and process for oxidant formation can be configured to facilitate improved mixing of for formation of an oxidant. Embodiments can be configured so conduits having a relatively large aspect ratio (e.g., 1.5 to 5 or 1.5 to over 5) can be utilized for improved gas mixing even in situations in which the carrier gas is at a relatively low pressure. Embodiments can also facilitate low nitrogen oxide formation combustion. Some embodiments can additionally provide improved carbon capture.

The present disclosure generally relates to antifoulant compositions and methods of preventing or inhibiting fouling. The disclosure relates to antifoulant compositions comprising one or more solvents, one or more antipolymerants, and one or more dispersants. The compositions may include other optional components, such as an antioxidant, an alcohol, and/or water. Methods of using the compositions in natural gas dehydrogenation processes to prevent or minimize fouling are also disclosed.