Physical clean separation method for waste high polymer mixtures and separation device therefor
A technology of high molecular polymer and separation method, which is applied in the field of physically pure separation method and separation device of waste high molecular polymer mixture, can solve the problems of difficult wetting of plastic surface, impure separation result, complicated process, etc. The effect of saving drying equipment, reducing production investment and simple equipment structure
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Embodiment 1
[0032] Analysis of the content of the mixture of polymers before separation:
[0033] Add xylene at room temperature to the sample, and obtain a PS true solution after treatment.
[0034] Add tetrahydrofuran at normal temperature to obtain a true solution of PVC after treatment.
[0035] Xylene at 75°C was added to obtain a true solution of LDPE after treatment.
[0036] Xylene at 85°C was added to obtain a true solution of LLDPE after treatment.
[0037] Xylene at 105°C was added to obtain a true solution of HDPE after treatment.
[0038] Xylene at 118°C was added to obtain a true solution of PP after treatment.
[0039] A true solution of PET was obtained after treatment with N-methylpyrrolidone at 160°C.
[0040] The content of each component of the above true solution can be measured by specific gravity method or viscosity method or refraction method or solid content method.
Embodiment 2
[0042] Separation of PS from polymer mixtures:
[0043] Add the pulverized high molecular polymer mixture into the soft net, hang the soft net on the porous inner liner, and feed nitrogen to make the oxygen content in the separation tower 3%. Use the first circulation pump to pump clean water from the liquid inlet, and circulate and wash through the water circulation circuit for 10 minutes to remove the silt on the surface of the mixture. After cleaning, stop the pump, open the drain valve under the drain port, and discharge the water from the drain port and drain pipe on the lower cover. Close the drain valve under the drain port. Then inject 3% sodium hydroxide solution from the liquid inlet with the first circulation pump, and circulate and clean it for 10 minutes through the alkaline water circulation loop to remove the oil on the surface of the mixture. After cleaning, stop the pump, open the drain valve under the drain port, and discharge the alkaline water from the dr...
Embodiment 3
[0045] Separation of PS and PP from the polymer mixture, which contains 30 kg of PS and 30 kg of PP:
[0046] Add the pulverized polymer mixture into the soft net, and then hang the soft net on the porous inner liner. Nitrogen is introduced to make the oxygen content in the separation tower 4%. The steps of water washing, alkali washing, neutralizing alkaline water and dehydration are the same as in Example 1, and the solvent used in the dehydration step is amyl acetate. The separation steps are as follows: inject 300 kg of amyl acetate at normal temperature from the solvent inlet with the second circulation pump, and circulate the amyl acetate in the solvent circuit for 30 minutes to dissolve the PS therein. When it is detected that the PS is completely dissolved, the valve leading to the PS solution tank is opened to collect the PS solution to obtain a true solution of PS. The pipeline is then flushed with amyl acetate, and the flushing solution enters the PS solution tank...
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