METHOD AND INSTALLATION FOR FIXED BED CONVERSION OF HEAVY PETROLEUM FRACTIONS WITH INTEGRATED PRODUCTION OF MIDDLE DISTILLATES WITH A VERY LOW SULPHUR CONTENT

摘要

the present invention relates to a process and an installation for treatment of a heavy oil with at least 80% by weight, has a boiling point higher than 340u00b0c, the process comprising the steps of: (a) in a fixed bed reactor hydroconversion operating upflow of liquid and gasthe net conversion products boiling below 360u00b0c is 10 to 99% w; (b) separation of the effluent from the step (a) with a gas containing hydrogen and h2s.a fraction of the gas, and possibly a fraction heavier than diesel and a naphtha fraction hydrotreating; (c) in contact with at least a portion of at least the catalyst comprising the gas obtained in step (b); and (d) separation of the effluent resulting from the step (c) with a gas containing hydrogen.and at least one cutting oil with a sulphur content of less than 50 ppm, preferably less than 20 ppm, and more preferably less than 10 ppm, the step (a) is carried hydroconversion at a pressure p1, and the step (c) are conducted in hydrotreating at a pressure p2, the difference of pn = p1-p2 being at least 2 mpa.the hydrogen supply to the hydroconversion steps (a) and (c) hydrotreating is provided by a single system of compression to n layers.