Results of Addition of Pulsating Crystallizer to Dewaxing Unit at 'Omsk Lubricant Plant' - A Subsidiary of OOO 'Gazprom-SM'.

Salient results of the installation of a pulsating crystallizer on the 39/6-4 dewaxing unit at the Omsk Lubricant Plant (Omskii Zavod Smazochnykh Masel) - a subsidiary of the gas-exporting company Gazprom Oil-Lubricants (Gazpromneft'-SM) are reported. The operating principle of the pulsating crystallizer is based on multi-batch mixing of wax-containing stock with a coolant (cooled solvent, filtrates,and their mixtures, etc.). The stock stream is mixed with batches of coolant by the pulsating action of a compressed inert gas. When the distillate stock is refined, the overall solvent-to-stock ratio was reduced by 24.8-26.6%, and the solvent-to-residual-stock ratio by 10.1%. moreover, the decrease in specific consumptions (calculated per 1 ton of dewaxed oil) was: stream - up to 35%, electric power - up to 10%, and water - up to 21%. When operating in two dewaxing stages, the yield of dewaxed oil increased by 4-6 and 1-2 wt. %, respectively, for the distillate and residual stock at the required pour point of the latter. The oil content in the slack wax (petrolatum) of the second filtration stage ncreased on average by 4-4.6 times when the distillate had beentreated, and 1.4 times when the residual stock had been treated. [ABSTRACT FROM AUTHOR]