Patent ID: 11884783
Assignee: nan
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. The device for destructive distillation of polyethylene and polypropylene waste, including at least two parallel heating units, each of which contains a destructive distillation reactor with top polymer feedstock feed (through the feeding unit) and bottom carbon residue discharge through the bottom side hatch of the reactor, each of the reactors contains a furnace designed to be detached from and attached to the reactor, and a fuel burner; decomposition unit for polymer feedstock destructive distillation products, which consists of the following items connected in sequence: water cooled heat exchanger with a downflow of a vapor-gas mixture of hydrocarbons, hydrocarbon receiver executed as a horizontal cylindrical container equipped with re-boiler heated by exhaust gases, dewaxing unit installed on the receiver, consisting of a bottom part with tubes and mass-exchanging packed beds filled with a catalyst, and a reflux column executed as a shell-and-tube heat exchanger installed at the top of the dewaxing unit; distillation column for separating diesel fuel and gasoline fractions, consisting of a reflux column installed at the top of the column, an enriching section with mass-exchanging packed beds filled with a catalyst, a feed section and a stripper, a heat exchanger for cooling the diesel fraction; a vertical shell-and-tube heat exchanger with downward gasoline vapors and hydrocarbon gas (gaseous fraction); a gas/water separator, vapor-gas mixture of hydrocarbons piping systems, exhaust gas piping systems with dampers installed before and after the hydrocarbon receiver; cooling systems installed on the piping of vapor-gas mixture of hydrocarbons from destructive distillation product receivers: diesel fuel fractions, gasoline fractions, gas fractions, wax fraction receiver; circulating water tank installed in the cooling system; coke receiver, separated water sump, is characterized by the fact that, each furnace is lined with refractory high-temperature ceramic fibers and installed on air cushions; the feeding unit of each reactor is vacuum; the reactors are connected to the vapor-gas mixture piping system by pipeline chainage with bypasses; there is a vacuum pump installed in the vapor-gas mixture piping system suitable for connecting to/disconnecting from each of the reactors; there is a carbon dioxide container installed in the vapor-gas mixture piping system suitable for connecting to/disconnecting from each of the reactors; a water-cooled heat exchanger with a downflow of a vapor-gas mixture of hydrocarbons is equipped with a vapor discharge piping with an exit branch for steam smothering; each reactor is connected to the vapor-gas mixture piping system by separate sections equipped with gate valves with bypasses cut before and after with pressure control valves in the phased vapor-gas mixture release system; there are boilers installed in exhaust gas piping system; there is a wax fraction trap installed at the top of the receiver under the water-cooled heat exchanger, that is suitable for extracting and feeding the wax fraction through the wax fraction cooler to the wax fraction trap; there is a droplet separator in the form of a funnel tube installed at the top of the receiver under the dewaxing unit to prevent foaming in the receiver; there is a hatch at the end of the receiver on the exhaust gases inlet to connect the receiver with the cooler for draining heavy waxes into the heavy wax receiver; there is a filter damping the vapor-gas mixture installed after the dewaxing unit's reflex column, tangentially connected at the outlet with the feed section of the distillation column to create eddying flow of the vapor-gas mixture in the distillation column; at least three column plates are installed in the stripper of the distillation column; automatic level controls with a discharge valve are installed under the receiver before the wax fraction cooler, after the stripper before the diesel fraction cooling heat exchanger, after the gas/water separator; titanium-free nickel-containing alloys with at least 20% nickel are used as a catalyst in the mass-exchanging packed beds; the device is additionally equipped with a gas separator at the outlet of the gas/water separator.