"13494472-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"@en-us . . . "112730887"@en-us . "0"^^ . . . . "hydrocracking"^^ . . "hydrocracking"@en-us . . "0"^^ . "113494472"^^ .