THERMODYNAMIC ANALYSIS OF THE COMPLEX REACTION SYSTEM FOR HYDRODECHLORINATION IN WASTE PIASTICS PYROLYSIS OIL

Abstract

Abstract: The thermodynamics of the complex hydrodechlorination reaction system of 13 kinds of organochlorides identified from the waste plastics pyrolysis oil was analyzed by using Aspen Plus software. First, simulations were performed using a Gibbs reactor in Aspen Plus software using thermodynamic analysis based on the principle of Gibbs free energy minimization, determining the equilibrium composition of the various organic chlorides under the specified initial composition and reaction conditions; then using the sensitivity analysis tool, the effects of the hydrogen-oil volumetric ratio, reaction temperature and pressure on the equilibrium composition of the complex reaction system were investigated. The results showed that the hydrodechlorination reaction of 13 kinds of organochlorides in the complex reaction system could be carried out spontaneously and completely under the given reaction conditions. For a given initial composition of organochlorides, hydrodechlorination effect was the best when the hydrogen-oil volumetric ratio was 3.7, the reaction temperature was 300-320 ℃, the reaction pressure was 3-5 MPa. Under the condition of excess hydrogen, the reaction degree of chloroalkanes was lower than that of chloroalkenes and arylchlorides.

Key words: solid waste treatment, waste plastics, pyrolysis oil, hydrodechlorination, simulation, thermodynamics

References

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