No abstract

Dewaxing with selective solvents in production of lube oils from paraffin-base crudes requires large investments and operating expenses. Up to 40% of all expenses are for this process. For this reason, searching for ways to enhance it is a pressing problem [1].Use of modifiers is the most effective and simplest method of increasing the efficiency of dewaxing of lube distillates with selective solvents. The efficiency of Paragel, Hightech E-603, Viscoplex, and N-500 pour-point depressants, which are products of condensation of chloroparaffin with naphthalene and methacrylic acid ester and aliphatic alcohol polymers in three-stage dewaxing of raffinates obtained from mixing crudes at Pleven Oil Refinery (Bulgaria), was demonstrated in [2].On addition of 0.2 wt. % of these additives, the yield of dewaxed oil increased by 2-3 wt. % and the filtration rate of the suspension in all stages increased by 2-4 times.

No abstract