Alkali-enhanced hydrothermal purification of plastic pyrolysis oils
A technology for pyrolysis oil and waste pyrolysis oil, which is applied in the field of alkali-enhanced hydrothermal purification of plastic pyrolysis oil, and can solve the problems of heat exchanger fouling and catalyst bed blockage, etc.
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Embodiment 1
[0072] High temperature NaOH treatment of waste plastic pyrolysis oil naphtha fraction
[0073]The following experiments were performed in a 1 liter batch autoclave reactor. The distilled naphtha fraction (5wt%-95wt% distillation range 85-174°C) derived from waste plastic pyrolysis oil (340g) was weighed into the reactor vessel together with 2wt% NaOH aqueous solution (227g). After sealing and pressure testing, the reactor stirred at 500 rpm was heated to the desired reaction temperature of 240° C. and then held for 30 minutes. The product was recovered after the reactor was subsequently cooled to room temperature. The contents were decanted from the reactor vessel into centrifuge tubes and the liquid was centrifuged at 20°C and 4300 rpm for 30 minutes. After centrifugation, the purified pyrolysis oil was recovered as a separate layer and analyzed for its Cl, Br, S and N content. The Cl, Br and S contents were determined using X-ray fluorescence spectroscopy, while the N co...
Embodiment 2
[0077] High temperature NaOH treatment of waste plastic pyrolysis oil naphtha fraction
[0078] The following experiments were performed in a 1 liter batch autoclave reactor. A distilled naphtha fraction (5wt%-95wt% distillation range 85-174°C) derived from waste plastic pyrolysis oil (340g) (commercially obtained from Ecomation) and 2wt% NaOH aqueous solution (227g) were weighed together to the reaction container. After sealing and pressure testing, the reactor stirred at 500 rpm was heated to the desired reaction temperature of 240° C. and then held for 30 minutes. The product was recovered after subsequent cooling of the reactor to room temperature. The contents were decanted from the reactor vessel into centrifuge tubes and the liquid was centrifuged at 20°C and 4300 rpm for 30 minutes. After centrifugation, the purified pyrolysis oil was recovered as a separate layer and analyzed for its Cl, Br, S, N and Si content. The Cl, Br and S contents were determined using X-ra...
Embodiment 3
[0082] Solvent Extraction of Middle Distillate from Waste Plastic Pyrolysis Oil
[0083] In this example, solvent extraction with N-methyl-2-pyrrolidone (NMP) was used to remove impurities from waste plastic pyrolysis oil middle distillate (5wt%-95wt% distillation range 172-342°C). Waste plastic pyrolysis oil (100 g) was first mixed with NMP (196 g NMP, 4 g water) containing 2 wt % water in a glass separatory funnel at room temperature. After mixing, the raffinate and extract are separated. The raffinate representing the purified waste plastic pyrolysis oil in this case was subjected to the same extraction treatment twice more (3 extraction steps in total). After the third extraction step, the raffinate was washed with water at ambient temperature using a 2:1 (w / w) water to oil ratio in a glass separatory funnel. The water-washed raffinate (ie, the purified pyrolysis oil middle distillate) was analyzed for Cl, Br, S and N content. The Cl, Br and S contents were determined u...
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