METHOD OF PRODUCING PARAFFINS AND DEWAXED OILS Russian patent published in 2014 - IPC C10G73/06 

FIELD: chemistry.

SUBSTANCE: invention relates to a method in which paraffin-containing material is mixed in steps with coolants in form of a cooled solvent and a dewaxing second step filtrate, in a multi-section vertically mounted apparatus - pulsating crystalliser. Mixing is carried out through pulsating action on the entire volume of the raw mixture filling the crystalliser, which provides back and forth movement in overflows between sections, wherein the coolants are continuously fed into the overflows. The suspension from the pulsating crystalliser is directly fed to filters where it is successively divided in two filtration steps in deoiling conditions to obtain a paraffin wax precipitate and deoiling filtrates. The filtrate from the second deoiling step is fed for diluting the suspension coming from the pulsating crystalliser into the first deoiling step. The filtrate from the first deoiling step is cooled in evaporation scraping crystallisers, followed by filtering the obtained suspension in two steps in dewaxing conditions to obtain a first dewaxing step filtrate - a solution of dewaxed oil. The filtrate from the second step, fed into the pulsating crystalliser as a coolant, and a by-product precipitate are obtained at the second dewaxing step.

EFFECT: high efficiency with respect to raw material and collection of dewaxed oil with high viscosity index.

2 dwg, 2 tbl, 2 ex