| 摘要 |
1,086,156. Crystallizing wax. ESSO RESEARCH & ENGINEERING CO. June 30, 1965 [July 1, 1964], No. 27760/65. Addition to 1,022,234. Heading B1G. Wax is crystallized from solution in a hydrocarbon fraction on cooling by passing the solution as a dispersion of essentially uniform size droplets countercurrently to a continuous phase aqueous coolant containing an additive comprising a polyglycol and/or a protein together with a surfactant. The polyglycol may be polyethylene glycol or polypropylene glycol having a molecular weight of 500-12,000. The protein may be gelatine or scleroprotein. The surfactant may be saponin or alkyl phenoxy poly(ethyleneoxy) ethanol. The additive may contain 50-70 parts of polyglycol, 20-30 parts of protein, and 8-20 parts of surfactant. 0.01-1.0% of additive based on additive plus coolant may be present. The hydrocarbon fraction may have a b.p. below 900‹F. The coolant may be water or an aqueous solution of sodium or calcium chloride. The droplets may have a particle size of 1/32-3/8 in. The system may be operated at a pressure of 15-1500 psig. According to the Fig. warm feed is introduced upwardly through an orifice plate 3 into a tower 2 and is passed countercurrently to a coolant and past a compression impeller to an outlet 24. The coolant is introduced into the tower through a ring of orifices 17, is removed through outlet 7, and is recycled after recooling. |
