The Experts below are selected from a list of 4671 Experts worldwide ranked by ideXlab platform

Randolph Kirchain - One of the best experts on this subject based on the ideXlab platform.

  • evaluating the economic viability of a Material Recovery system the case of cathode ray tube glass
    Environmental Science & Technology, 2009
    Co-Authors: Jeremy Gregory, Marie-claude Nadeau, Randolph Kirchain
    Abstract:

    This paper presents an analysis of the Material Recovery system for leaded glass from cathode ray tubes (CRTs) using a dynamic Material flow analysis. In particular, the global mass flow of primary and secondary CRT glass and the theoretical capacities for using secondary CRT glass to make new CRT glass are analyzed. The global mass flow analysis indicates that the amount of new glass required is decreasing, but is much greater than the amount of secondary glass collected, which is increasing. The comparison of the ratio of secondary glass collected to the amount of new glass required from the mass flow analysis indicates that the Material Recovery system is sustainable for the foreseeable future. However, a prediction of the time at which the market for secondary glass will collapse due to excess capacity is not possible at the moment due to several sources of uncertainty.

  • Supply and demand in the Material Recovery system for cathode ray tube glass
    2009 IEEE International Symposium on Sustainable Systems and Technology, 2009
    Co-Authors: Jeremy Gregory, Marie-claude Nadeau, Randolph Kirchain
    Abstract:

    This paper presents an analysis of the Material Recovery system for leaded glass from cathode ray tubes (CRTs). In particular, the global mass flow of primary and secondary CRT glass and the theoretical capacities for using secondary CRT glass to make new CRT glass are analyzed. The global mass flow analysis indicates that the amount of new glass required is decreasing, but is much greater than the amount of secondary glass collected, which is increasing. The comparison of the ratio of secondary glass collected to the amount of new glass required from the mass flow analysis indicates that the Material Recovery system is sustainable for the foreseeable future. However, a prediction of the time at which the market for secondary glass will collapse due to excess capacity is not possible at the moment due to several sources of uncertainty.

  • Assessing the sustainability of the Material Recovery system for CRT glass
    2008 IEEE International Symposium on Electronics and the Environment, 2008
    Co-Authors: Marie-claude Nadeau, Jeremy Gregory, Randolph Kirchain
    Abstract:

    In recent years, electronic waste has emerged as a waste stream of concern for many reasons; including the need to handle hazardous or extract valuable Materials. Within this e- waste stream, cathode-ray tube (CRT) glass waste, from televisions (TVs) and computer monitors, is of particular concern because of high recycling costs and low secondary Material value. Economic issues are thus a significant consideration when assessing the sustainability of this Material Recovery system. In particular, there are questions as to whether the demand for recycled CRT cullet will remain sufficient to sustain the secondary Material market. The authors present two models developed to characterize the global mass flow of primary and secondary CRT glass. The first model assesses future supply and the second evaluates potential future demand for secondary CRT cullet.

Ursel Hornung - One of the best experts on this subject based on the ideXlab platform.

  • stepwise pyrolysis for raw Material Recovery from plastic waste
    Journal of Analytical and Applied Pyrolysis, 1998
    Co-Authors: Henning Bockhorn, Andreas Hornung, Ursel Hornung
    Abstract:

    Abstract High costs of pollution control for incinerators, the high energy content of plastics as well as the chemical composition of plastics are demanding for alternative treatment of plastic refuses where plastic waste is considered as a resource of energy and as chemical raw Material. One possible alternative is the pyrolysis of plastics. Kinetic data obtained from micro thermogravimetry and well stirred type reactor experiments confirm, that different molecular structures of commodity plastics bring about different reaction mechanisms of thermal decomposition, different reaction rates, and different temperature dependencies of the decomposition rates. From that, stepwise pyrolysis of mixtures of plastics seems to be reasonable where the different components are pyrolysed at different temperatures. This work aims at a stepwise pyrolysis procedure where the thermal decomposition of different components of a mixture of plastics is performed consecutively at different temperatures. For a continuous process a cascade of well stirred reactors has been developed where mixing of the reactor contents occurs by circulating of stainless steel spheres. Examples for the separation of single plastics by thermal decomposition of mixtures of poly(vinyl chloride), polystyrene and polyethylene and polystyrene, polyamide 6 and polyethylene, respectively, are presented. In a first step hydrogen chloride from poly(vinyl chloride) is obtained, in the second step the monomer of polysytrene and/or polyamide 6 is formed and in the third step aliphatic compounds from polyethylene decomposition are trapped.

  • Stepwise pyrolysis for raw Material Recovery from plastic waste
    Journal of Analytical and Applied Pyrolysis, 1998
    Co-Authors: Henning Bockhorn, Armin Hornung, Ursel Hornung
    Abstract:

    High costs of pollution control for incinerators, the high energy content of plastics as well as the chemical composition of plastics are demanding for alternative treatment of plastic refuses where plastic waste is considered as a resource of energy and as chemical raw Material. One possible alternative is the pyrolysis of plastics. Kinetic data obtained from micro thermogravimetry and well stirred type reactor experiments confirm, that different molecular structures of commodity plastics bring about different reaction mechanisms of thermal decomposition, different reaction rates, and different temperature dependencies of the decomposition rates. From that, stepwise pyrolysis of mixtures of plastics seems to be reasonable where the different components are pyrolysed at different temperatures. This work aims at a stepwise pyrolysis procedure where the thermal decomposition of different components of a mixture of plastics is performed consecutively at different temperatures. For a continuous process a cascade of well stirred reactors has been developed where mixing of the reactor contents occurs by circulating of stainless steel spheres. Examples for the separation of single plastics by thermal decomposition of mixtures of poly(vinyl chloride), polystyrene and polyethylene and polystyrene, polyamide 6 and polyethylene, respectively, are presented. In a first step hydrogen chloride from poly(vinyl chloride) is obtained, in the second step the monomer of polysytrene and/or polyamide 6 is formed and in the third step aliphatic compounds from polyethylene decomposition are trapped. © 1998 Elsevier Science B.V. All rights reserved.

Marie-claude Nadeau - One of the best experts on this subject based on the ideXlab platform.

  • evaluating the economic viability of a Material Recovery system the case of cathode ray tube glass
    Environmental Science & Technology, 2009
    Co-Authors: Jeremy Gregory, Marie-claude Nadeau, Randolph Kirchain
    Abstract:

    This paper presents an analysis of the Material Recovery system for leaded glass from cathode ray tubes (CRTs) using a dynamic Material flow analysis. In particular, the global mass flow of primary and secondary CRT glass and the theoretical capacities for using secondary CRT glass to make new CRT glass are analyzed. The global mass flow analysis indicates that the amount of new glass required is decreasing, but is much greater than the amount of secondary glass collected, which is increasing. The comparison of the ratio of secondary glass collected to the amount of new glass required from the mass flow analysis indicates that the Material Recovery system is sustainable for the foreseeable future. However, a prediction of the time at which the market for secondary glass will collapse due to excess capacity is not possible at the moment due to several sources of uncertainty.

  • Supply and demand in the Material Recovery system for cathode ray tube glass
    2009 IEEE International Symposium on Sustainable Systems and Technology, 2009
    Co-Authors: Jeremy Gregory, Marie-claude Nadeau, Randolph Kirchain
    Abstract:

    This paper presents an analysis of the Material Recovery system for leaded glass from cathode ray tubes (CRTs). In particular, the global mass flow of primary and secondary CRT glass and the theoretical capacities for using secondary CRT glass to make new CRT glass are analyzed. The global mass flow analysis indicates that the amount of new glass required is decreasing, but is much greater than the amount of secondary glass collected, which is increasing. The comparison of the ratio of secondary glass collected to the amount of new glass required from the mass flow analysis indicates that the Material Recovery system is sustainable for the foreseeable future. However, a prediction of the time at which the market for secondary glass will collapse due to excess capacity is not possible at the moment due to several sources of uncertainty.

  • Assessing the sustainability of the Material Recovery system for CRT glass
    2008 IEEE International Symposium on Electronics and the Environment, 2008
    Co-Authors: Marie-claude Nadeau, Jeremy Gregory, Randolph Kirchain
    Abstract:

    In recent years, electronic waste has emerged as a waste stream of concern for many reasons; including the need to handle hazardous or extract valuable Materials. Within this e- waste stream, cathode-ray tube (CRT) glass waste, from televisions (TVs) and computer monitors, is of particular concern because of high recycling costs and low secondary Material value. Economic issues are thus a significant consideration when assessing the sustainability of this Material Recovery system. In particular, there are questions as to whether the demand for recycled CRT cullet will remain sufficient to sustain the secondary Material market. The authors present two models developed to characterize the global mass flow of primary and secondary CRT glass. The first model assesses future supply and the second evaluates potential future demand for secondary CRT cullet.

Jeremy Gregory - One of the best experts on this subject based on the ideXlab platform.

  • evaluating the economic viability of a Material Recovery system the case of cathode ray tube glass
    Environmental Science & Technology, 2009
    Co-Authors: Jeremy Gregory, Marie-claude Nadeau, Randolph Kirchain
    Abstract:

    This paper presents an analysis of the Material Recovery system for leaded glass from cathode ray tubes (CRTs) using a dynamic Material flow analysis. In particular, the global mass flow of primary and secondary CRT glass and the theoretical capacities for using secondary CRT glass to make new CRT glass are analyzed. The global mass flow analysis indicates that the amount of new glass required is decreasing, but is much greater than the amount of secondary glass collected, which is increasing. The comparison of the ratio of secondary glass collected to the amount of new glass required from the mass flow analysis indicates that the Material Recovery system is sustainable for the foreseeable future. However, a prediction of the time at which the market for secondary glass will collapse due to excess capacity is not possible at the moment due to several sources of uncertainty.

  • Supply and demand in the Material Recovery system for cathode ray tube glass
    2009 IEEE International Symposium on Sustainable Systems and Technology, 2009
    Co-Authors: Jeremy Gregory, Marie-claude Nadeau, Randolph Kirchain
    Abstract:

    This paper presents an analysis of the Material Recovery system for leaded glass from cathode ray tubes (CRTs). In particular, the global mass flow of primary and secondary CRT glass and the theoretical capacities for using secondary CRT glass to make new CRT glass are analyzed. The global mass flow analysis indicates that the amount of new glass required is decreasing, but is much greater than the amount of secondary glass collected, which is increasing. The comparison of the ratio of secondary glass collected to the amount of new glass required from the mass flow analysis indicates that the Material Recovery system is sustainable for the foreseeable future. However, a prediction of the time at which the market for secondary glass will collapse due to excess capacity is not possible at the moment due to several sources of uncertainty.

  • Assessing the sustainability of the Material Recovery system for CRT glass
    2008 IEEE International Symposium on Electronics and the Environment, 2008
    Co-Authors: Marie-claude Nadeau, Jeremy Gregory, Randolph Kirchain
    Abstract:

    In recent years, electronic waste has emerged as a waste stream of concern for many reasons; including the need to handle hazardous or extract valuable Materials. Within this e- waste stream, cathode-ray tube (CRT) glass waste, from televisions (TVs) and computer monitors, is of particular concern because of high recycling costs and low secondary Material value. Economic issues are thus a significant consideration when assessing the sustainability of this Material Recovery system. In particular, there are questions as to whether the demand for recycled CRT cullet will remain sufficient to sustain the secondary Material market. The authors present two models developed to characterize the global mass flow of primary and secondary CRT glass. The first model assesses future supply and the second evaluates potential future demand for secondary CRT cullet.

Hasim Altan - One of the best experts on this subject based on the ideXlab platform.