TH3735B - Process for the production of hydrocarbons - Google Patents

Abstract

To prepare hydrocarbons from synthetic gas on Co/Zr/SiO2 catalysts. The figure is prepared by diffusion and/or kneading the catalyst into a stationary bed, providing a given relationship between the external (Se) and internal (Si) surfaces in order to have C+5. high selectivity Bed catalysts should have Se (between 5 and 70 m²/mL) and Si (between 10 and 400 m²/mL), as given the following relation: 106 less than Se2 x Si > 2.5 x 104.

Claims (10)

1. The process for preparing hydrocarbons by catalytic reaction of carbon monoxide with hydrogen is characterized by the exposure of a carbon monoxide and hydrogen mixture to a catalyst at high temperature and pressure. The catalyst contains 3-60 p/g by weight of cobalt and at least one other metal of choice from zirconium, titanium, and chromium in amounts of 0.1-100 p/g by weight to 100 p/g by weight of silica, alumina, or silica-alumina. This catalyst is prepared by kneading and/or saturated diffusion, characterized by the catalyst existing as a stationary bed and having an outer surface area (Se) between 5 and 70 m/mm² and an inner surface area (Si) between 10 and 400 m/ml, as given the relationship 10⁶ > Se² x Si > 2.5 x 10⁴. 2. A process as claimed in claim 1, which shows that the bed catalyst has Se between 10 and 50 sq cm/ml and Si between 15 and 200 sq m/ml, such that the relationship 2.5 x 10⁵ is less than Se² x Si > 3 x 10⁴. 3. The process as claimed in claim 1 or 2, which shows that the catalyst provides the following relationship (chemical formula): L = total amount of cobalt present on the catalyst, expressed in milligrams of Co/mL; Si = internal surface area of the catalyst, expressed in square meters/mL; and R = weight ratio between the amount of cobalt supplied to the catalyst by massaging and the total amount of cobalt present on the catalyst. 4. A process as claimed in any one of the claims 1-3 that exhibits the characteristic of a catalyst containing 15-50 parts by weight of cobalt per 100 parts by weight of support and 0.1-5 parts by weight of another metal if in preparation cobalt is added first and then another metal is added, or 5-40 parts by weight of another metal if in preparation another metal is added first and then cobalt is added. 5. A process that encompasses one of the claims in Claims 1-4 that demonstrates the catalyst having zirconium as an additional metal and silica as a supporting material. 6. The process is entitled under any of the claims in Claims 1-5, which describe a process performed at temperatures of 125-350°C and pressures of 5-100 bar. 7. A process that provides for one of the claims in Claims 1-6, which demonstrates the characteristics of an H2/CO mixture with a molar ratio of H2/CO between 1.75 and 2.25. 8. The process as claimed in any of the claims 1-7, characterized by the preparation of at least one fraction of the central distillate from the product prepared on the cobalt catalyst, whose initial boiling point is higher than the final boiling point of the heaviest central distillate to be the final product, shall be subjected to hydrocracking by contacting this fraction with one or more noble metals of Group VIII on a support at high temperature and pressure. 9. The process as claimed in claim 8, which describes the hydrocracking process using a catalyst containing one or more noble metals of group VIII in 0.1-2% by weight. 10. A process as claimed in one of the claims in Claims 8-9 that demonstrates the hydrocracking process using a catalyst with platinum or palladium as a Group VIII noble metal and silica-alumina as a support.