The use of a single chemical or refinery process unit alternately in more than one operation; for example, a catalytic reactor will first produce a chemical product and then will be blocked from the main process stream during catalyst regeneration.



Related Terms

BATCH

  1. The quantity of material required for or produced by one operation. 2. An amount of material subjected to some unit chemical process or physical mixing process to make the final product substantially uniform.

BLOWDOWN STACK

A vertical stack or chimney into which the contents of a chemical or petroleum process unit are emptied in case of an operational emergency.

PETROLEUM ISOMERIZATION PROCESS

A fixed-bed, vapor-phase petroleum-refinery process using a precious-metal catalyst and external hydrogen; feedstocks include natural gas, pentane, and hexane cuts; the product is highoctane blending stock.

HYDROFORMING

A petroleum-refinery process in which naphthas are passed over a catalyst at elevated temperatures and moderate pressures in the presence of added hydrogen or hydrogen-containing gases, to form high-octane BTX aromatics for motor fuels or chemical manufacture.

TITRATION

A chemical process used in analyzing feedwater.

PILOT-SCALE CHEMICAL REACTION

Small-scale chemical reaction used to test operating conditions and product yields; used as a pilot for design of large-scale reaction systems.

BUTANE VAPOR-PHASE ISOMERIZATION

A process to isomerize normal butane into isobutane in the presence of aluminum chloride catalyst and hydrogen chloride promoter.

COUNTING CIRCUIT. COUNTERCURRENT EXTRACTION

A liquid-liquid extraction process in which the solvent and the process stream in contact with each other flow in opposite directions. Also known as countercurrent separation.

ASSEMBLY LINE

A mass-production arrangement whereby the work in process is progressively transferred from one operation to the next until the product is assembled.

ACID PROCESS

A chemical pulping process that uses an acidic calcium sulphite solution plus heat to break the bonds in wood between the cellulose and the wood fibres.

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