METHOD OF PRODUCING LOW-FREEZING PETROLEUM PRODUCTS Russian patent published in 1998 - IPC

FIELD: petroleum processing. SUBSTANCE: most effective methods for producing low-freezing petroleum products useful, in particular, as lubricants, hydraulic liquids, diesel and aircraft fuels, are those involving catalytic dewaxing on silica zeolite-based catalysts. Commonly, high-silica zeolites in H form are utilized. However, all known methods are characterized by low productivity caused by underactivity of existent catalysts. This shortcoming is overcome by carrying out catalytic dewaxing of corresponding oil distillates on catalyst containing mixed polyvalent and H form of high-silica zeolite with at least 50 wt % of exchange value of sodium in initial zeolite for polyvalent cation(s) and summary exchange value at least 95 wt %, process parameters being the following: temperature 260-380 C, pressure 4-5 MPa, space velocity 2-6 h^-1, and hydrogen to raw material ratio 500 to 1500. EFFECT: increased (by a factor of 2-3) productivity and improved working characteristics of product. 2 tbl