Method for preparing polyethylene wax by using waste polyethylene plastic
A polyethylene wax and waste polyethylene technology, which is applied in plastic recycling, recycling technology, bulk chemical production, etc., can solve the problems of pyrolysis gas pollution, uneven heat transfer, high cracking temperature, etc., and achieve high heat transfer efficiency , low viscosity and low cracking temperature
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Embodiment 1
[0013] Example 1: Take 100 g of waste polyethylene agricultural film (cleaned and shredded) and put it into a high-pressure reactor, add 0.3 g of Al-MCM-48 catalyst and 15 mL of heavy aromatic oil, seal the reactor, and purge with nitrogen for about 10 The air in the reaction kettle was removed by replacement for min, the stirring device was turned on, the temperature was raised to 380 °C, the cracking was carried out for 2.5 h, the material was cooled to room temperature and discharged, filtered and dried, and the catalyst and solvent were recovered to obtain polyethylene wax.
[0014] The polyethylene wax prepared in Example 1 is a pale yellow wax with a molecular weight of 2725.2, a drop melting point of 106.8°C, a yield of nearly 100%, no cracking gas, no raw material entanglement, and a solvent recovery rate of 97.8%.
Embodiment 2
[0015] Embodiment 2: No solvent is added, the method is the same as that of Embodiment 1, and polyethylene wax is prepared.
[0016] The polyethylene wax obtained in Example 2 is a light yellow waxy substance with a molecular weight of 1858.5-2395.5 (relatively dispersed), a drop melting point of 103.5°C, and a yield of 94.3%. There is cracking gas and entanglement of raw materials.
Embodiment 3
[0017] Embodiment 3: no catalyst is added, the method is the same as that of embodiment 1, and polyethylene wax is prepared.
[0018] The polyethylene wax prepared in Example 3 is a light yellow block with a molecular weight of 1728-2281.5 (relatively dispersed), a drop melting point of 102.4 °C, and a yield of 84.2%. A small amount of cracking gas is produced, and there is no entanglement of raw materials. The recovery rate is 98.2%.
[0019] Comparing the effects of Examples 1, 2 and 3, it can be seen that with heavy aromatic oil as solvent, Al-MCM-48 as catalyst, polyethylene wax is prepared from waste polyethylene plastics, the cracking temperature is low, the time is short, and the product molecular weight distribution is relatively Concentration, qualified quality, and can effectively solve the problems of uneven heat transfer, low efficiency, excessive cracking and carbonization and coking caused by excessive local temperature, low product yield, entanglement of raw mat...
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