英语翻译Catalytic reforming is used in refining to improve the o

英语翻译
Catalytic reforming is used in refining to improve the octane number of distillates in the gasoline boiling range,and in chemical manufacture for the production of aromatic hydrocarbons.The process was first used in reefing in 1940:it is second only to catalytic cracking in importance in the USA,and in Europe,where the higher boiling petroleum fractions are relatively more important,it is the major refining process.Typically,it increases the octane number of a feed with a boiling range of 70 to 190°C from about 40 to about 95.It is not effective for raising the octane number of the lower-boiling,straight-run fractions,for reasons which will become clear shortly.