| 摘要 |
The invention relates to a method for thermally decomposing polyethylene and polypropylene waste to produce hydrocarbon raw material. The method is carried out in the presence of a catalyst in the form of a heterogeneous catalyst made of titanium strips which are twisted in the same or different directions to form spirals. The titanium spirals are disposed in a catalyst column, in a bottom reservoir, in the pipes of a heat exchanger in which high-boiling components of a vapor/gas mixture are condensed, and in the pipes of the dephlegmators of a dewaxer and of a rectification column. The isolation or fractionation of liquid components from a vapor/gas mixture of hydrocarbons, formed in the process of thermal decomposition, is conducted in four stages. The first stage involves condensing high-boiling components of the vapor/gas mixture in a water-cooled heat exchanger at 300-360°C. The second stage involves condensing paraffins in a column which acts as a dewaxer, at 180-300°C. The condensed high-boiling hydrocarbons and paraffins, which form a furnace fuel fraction, are kept in a bottom reservoir at 300-360°C. The third stage involves separating fractions of gasoline and diesel fuel in a rectification column, at a temperature of 35-100°C in the upper portion of the rectification column, and 160-220°C in the lower portion thereof. The fourth stage involves condensing gasoline vapor and water vapor, in a heat exchanger, at a temperature of 20-35°C. The method permits an improvement in the quality of the finished products obtained. |
