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Answer for the clue "The process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst ", 13 letters:
hydrocracking

Word definitions for hydrocracking in dictionaries

WordNet Word definitions in WordNet
n. the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst

Wiktionary Word definitions in Wiktionary
n. (context organic chemistry English) the production of high-octane petroleum fuel and kerosene by hydrogenate large or complex hydrocarbons and then cracking them. vb. (present participle of hydrocrack English)