SU518516A1 - Method of dewaxing fuels - Google Patents

Description

(54) METHOD OF DEPARAPHIZING TOWTUB In addition, it requires significant time for separation, which, after separation, contains a significant amount of liquid phase - dewaxed liquid. This leads to a decrease in the yield of dross-refined tolly, a decrease in the depth of extraction of impurities from the complex during the passage to a high content of aromatic hydrocarbons in liquid paraffins. The purpose of the invention is to reduce the separation of o4 of the reaction mixture of dewaxed fuel, increase its output, and improve the quality of liquid paraffins. (For this, the head fraction of the fuel, separated from the raw material before mixing with urea, is introduced into the peaKii.HOHJiyio mixture at a stage of cooling. It is possible to introduce the head fraction of the fuel into the reaction mixture when it is cooled to no more than W ° C above the end. Heads of complex formation The head fraction separated by distillation is cooled before the reaction into the reaction mixture, and during deparafish {filling of the fuel with a solution of urea in isopropyl alcohol, it is isopropyl alcohol. At neo-holinity, the dissolved alcohol is reduced by distillation. water of the fraction of fuel in the iio3BOH.qeT reaction mixture improve separation, reduce the content of dewaxed fuel in the complex, increase the yield of dewaxed sugar and improve the quality of liquid paraffins (reduce the content of aromatic hydrocarbons in them). Arlan oil fuels. Distillation was carried out on an APH-2 apparatus to produce two fractions, a head-water with a cooling-off temperature of minus and a residue. The residue is dewaxed with a solution of urea in isopropyl alcohol under conditions of mechanical stirring. In all experiments, the speed of the agitator is constant. The head fraction is saturated with isopropyl alcohol and introduced into the reaction mixture after cooling down to the final temperature, as well as in the temperature range from the final to a temperature 10 ° C higher than it. The mixture is separated by settling with the time of separation. The complex is subjected to washing (ISO-ITS C fraction), followed by separation of the rinsing solution and decomposition of the complex by heating to 80 ° C. Alcohol is washed from the paraffins obtained and the fracdus is distilled off, boiling to 250 ° C. Under similar conditions, dewaxing, washing of the complex and release of paraffins are carried out according to a known method, according to which the head fraction is mixed with the dewaxed residue. Indicators of the quality of the feedstock and the resulting fractions are given in table. 1. Dewaxing mode and product quality when-. listed in table. 2. Table 1.

Remainder

tin fraction

-one

Specific weight, g / cm

0.834

1Cinematic viscosity

at 20 ° C, cst

Fraksh

Begin boiling, C Shregon temperature

-.t

5Y: &

909i

96%

TervHiepatypa zstgany. With

Exit ..%

0.843 9.2

272

280

300

345

363

-2

50

As a view from the table, often G1 - lesob reduces time. l l1shk. from the reactive ionic mixture of dewaxed uplenia, mga /. content in the complex;; , (Raay, increase the output of deiraphinating fuel and improve the quality of paraffin.

Claims (2)

1. A method for dewaxing fuels by separating a feedstock by distillation into head and residual fractions, mixing the residual fraction with urea and cooling the resulting reaction mixture of dividing it into a split paraffin fuel and complex, followed by decomposing it with a waxed paraffin mixture, in order to improve the separation of the reaction mixture, increase the yield of dewaxed fuel and the quality of liquid paraffins, the head fraction of the fuel is introduced into the reaction mixture at the stage and cooling. 2. A method according to claim 1, characterized in that the head fraction is introduced into the reaction mixture at a temperature not more than iO ° C above the final cooling temperature.