(from the article `petroleum refining`) As early as 1920, large volumes of residue were being processed in visbreakers or thermal cracking units. These simple process units basically ...Found on http://www.britannica.com/eb/a-z/v/29
A thermal cracking process unit in a refinery used to break up large molecules into smaller ones. It is applied to the residue of vacuum distillation as part of the overall conversion process.
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