PROCESS FOR HYDROREFINING HEAVY HYDROCARBON OIL

摘要

According to the prior art, the production of heavy fuel having a sulfur content of as low as 1% by mass or below by hydrorefining a stock oil consisting of a heavy hydrocarbon oil obtained from a heavy crude oil which contains sulfur and metal in amounts larger than those of ordinary crude oil and has an API degree of 30 or below required higher reaction temperature and was accompanied with a remarkably enhanced deactivation rate of the catalyst which results in a remarkably shortened lifetime of the catalyst, so that the hydrorefining could not be attained. According to the invention, heavy fuel having a sulfur content of as low as 1% by mass or below can be produced, efficiently without lowering the degree of demetallization while retarding the deactivation of the catalyst, by mixing 100 parts by volume of the above heavy hydrocarbon oil obtained from a heavy crude oil having an API degree of 30 or below with 30 to 1000 parts by volume of a heavy hydrocarbon oil obtained from a light crude oil having an API degree of 35 or above and hydrorefining the obtained mixed oil.