Influence of process conditions on product yield of waste tyre pyrolysis- A review

Abstract

Abstract−Waste tyres have become a grave concern as their accumulation is aggregating every year. Not only the size of waste tyre has to be reduced, but also some useful energy has to be recovered out of it as the world badly requires energy from alternate sources. Pyrolysis is one such method to extract energy potential products from waste tyres. It is extensively used to generate carbon black (solid product), tyre-oil (liquid product) and syngas (gas product) from waste tyres. In that connection, this article discusses the effect of various parameters on the product composition of pyrolysis of waste tyres. The current usage of pyrolysis products and their typical characteristics are also discussed in this critique. Of late, extraction of high value added products, such as activated carbon from carbon black, and limonene from tyre-oil is gaining attention. The article also throws some light on the application and generation routes of activated carbon and limonene from waste tyres.

Char from Spent Tire Rubber: A Potential Adsorbent of Remazol Yellow Dye

“…The produced char showed a 12.9% ash content, a surface area of 69 m 2 /g, high percentages of fixed carbon, and a neutral surface. In the RY removal assays, the char showed to be efficient with almost 100% removal efficiency at the natural RY pH (6.0), adsorbent dosage of 4 g/dm 3 , and initial dye concentration of 20 mg/dm 3 . Kinetic assays and modelling of the experimental data demonstrated a better adjustment to the pseudo-first order kinetic model with a calculated uptake capacity of 14.2 mg RY/g char.…”

“…To investigate the effects of pH (2-6) and adsorbent dosage (1-4 g/dm 3 ), an initial concentration of 20 mg/dm 3 of RY and a contact time of 150 min were used. The study on the effect of contact time (kinetic study) was performed up to 360 min, at the natural pH of RY solution (6.0), an initial concentration of 100 mg/dm 3 , and an adsorbent dosage of 4 g/dm 3 . The influence of different initial concentrations (equilibrium studies) was performed at an adsorbent dosage of 4 g/dm 3 where C0 and Cf (mg/dm 3 ) are the initial and final concentrations of dye in solution, respectively, V (dm 3 ) is the volume of solution, and m (g) is the amount of the adsorbent used.…”

“…The study on the effect of contact time (kinetic study) was performed up to 360 min, at the natural pH of RY solution (6.0), an initial concentration of 100 mg/dm 3 , and an adsorbent dosage of 4 g/dm 3 . The influence of different initial concentrations (equilibrium studies) was performed at an adsorbent dosage of 4 g/dm 3 where C0 and Cf (mg/dm 3 ) are the initial and final concentrations of dye in solution, respectively, V (dm 3 ) is the volume of solution, and m (g) is the amount of the adsorbent used. The kinetic data were modelled through pseudo-first and pseudo-second order kinetic models (Equations (3) and (4), respectively) to describe adsorption data obtained under non-equilibrium conditions [18][19][20].…”

“…In this context, ST recycling must be strengthened with new C 2019, 5, 76; doi:10.3390/c5040076 www.mdpi.com/journal/carbon solutions based on the concept of material valorization. Pyrolysis (also known as chemical recycling) has demonstrated to be a viable route for ST valorization, as it effectively converts wastes into high added-value products, such as chars and other materials, that can be used in different industries in a wide range of applications [3][4][5]. Among the possible applications for ST-derived chars, their singular properties turn them into potential adsorbents for the removal of pollutants from contaminated wastewaters [5][6][7][8].…”

Scrap Tyre Management Pathways and Their Use as a Fuel—A Review

“…The issue of scrap tyres is of great importance due to the major environmental impact that they cause. Over 1.5 billion tonnes of tyres per annum are discarded all around the globe [3][4][5] weighing 17 million tonnes [6]. In Australia, the number of tyres which are produced annually for passenger cars, trucks and other vehicles is also rapidly increasing.…”