• Title, Summary, Keyword: Recyclable

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Heterogeneous Suzuki Cross-Coupling Reaction Catalyzed by Magnetically Recyclable Nanocatalyst

  • Choi, Kwang-Hyun;Shokouhimehr, Mohammadreza;Sung, Yung-Eun
    • Bulletin of the Korean Chemical Society
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    • v.34 no.5
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    • pp.1477-1480
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    • 2013
  • The Suzuki cross-coupling reactions proceeded in excellent yields when it was catalyzed by magnetically recyclable nanocatalyst. This nanocatalyst provided very high catalytic activity with low loading level (1 mol %), because the palladium nanoparticles were so small in size (~2 nm) and located on the surface of the nanocomposite. It was also easily recovered from the reaction mixture using a magnet and reused for six consecutive cycles.

A Study on the Status and Policy Direction of Collection and Recycling of Waste Plastics (폐플라스틱류 수집 및 재활용 현황과 정책 방향)

  • Kim, Hyeong-Wook;Um, Namil;Park, Yoon-Soo;Lee, Youngkee;Kim, Ki-Heon
    • Journal of Korea Society of Waste Management
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    • v.35 no.6
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    • pp.471-480
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    • 2018
  • In this study, the amount of plastic waste produced in Korea and the state of its treatment are analyzed. In addition, trends in sales prices of recyclable resources are identified and used as basic research data in countermeasures for the rejection of recyclable waste collection companies. According to the state of waste generation and disposal nationwide in 2017, the amount of plastic waste generated increased by 7.2% annually over the five-year period starting in 2012, reaching 7.1 million tons in 2016. In the case of composition ratio, 36.7% of household wastes occupy. In the case of the plastic recycling market, the demand for recycled waste plastics and plastics decreased due to sluggish domestic and overseas economies since 2015, and the prices of synthetic resins such as PE, PP, and PS of pellets dropped by about 20%. As for the selling prices of recyclable resources in apartment houses in March 2017, the average selling price including plastics is 1071 won/ month generation. When plastic was excluded it was 941 won/month generation, which amounts to about a 130 won/month generation difference. The average selling price of recyclable resources over the period of March-May 2018 is about 697 won/month generation. In March 2017, it was found to decrease by about 26% of the sale price.

Temperature Dependence of Conductivities of Recyclable Polyethylene and Polypropylene and its Effects on Electric Field Distribution in Power Cable (재활용 가능한 폴리에틸렌과 폴리프로필렌의 전도도 온도의존성과 전력케이블 내의 전계분포에 미치는 영향)

  • Lee, June-Ho;Kong, Tae-Sik;Kim, Seong-Jung;Kwon, Ki-Hyung;Cho, Kyu-Cheol;Hozumi, Naohiro
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.10
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    • pp.1881-1887
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    • 2011
  • In this work the recyclable new polyethylene(PE) and polypropylene(PP), which are thermoplastic, have been investigated as the eco-friendly insulating candidates to replace the cross-linked polyethylene (XLPE). The temperature dependence of conductivities of these materials has been measured and its effects on electric field and space charge distribution in polymeric insulated power cable under temperature gradient have been calculated. It is shown that the sensitivity of conductivity to temperature change has more critical influence to determine the electric field distribution in the power cable than the absolute value of conductivity does and it can be said that the temperature dependence is one of most important factors for the power cable design.

A Study on Physical Properties of Recyclables obtained from MSW (재활용(再活用) 대상(對象) 폐자원( 廢資源)의 물리적(物理的) 성상(性狀) 분석(分析)에 관한 연구(硏究))

  • Choi, Woo Zin;Yoon, Kun Duk
    • Journal of the Korean Institute of Resources Recycling
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    • v.21 no.5
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    • pp.72-78
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    • 2012
  • In general, recyclable items are separately discharged from households and then, hand-sorted into different types of valuables at materials recovery facilities (MRF). However, most of residues after hand-sorting are finally end up with landfill and/or incineration due to lack of separation technologies and economical reasons. In the present study, physical properties on recyclable items obtained from an MRF are investigated to improve the recovery of valuable items. The results of physical compositions based on the sizing tests are also presented.

Optimal Operation for Green Supply Chain Considering Demand Information, Collection Incentive and Quality of Recycling Parts

  • Watanabe, Takeshi;Kusukawa, Etsuko
    • Industrial Engineering and Management Systems
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    • v.13 no.2
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    • pp.129-147
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    • 2014
  • This study proposes an optimal operational policy for a green supply chain (GSC) where a retailer pays an incentive for collection of used products from customers and determines the optimal order quantity of a single product under uncertainty in product demand. A manufacturer produces the optimal order quantity of product using recyclable parts with acceptable quality levels and covers a part of the retailer's incentive from the recycled parts. Here, two scenarios for the product demand are assumed as: the distribution of product demand is known, and only both mean and variance are known. This paper develops mathematical models to find how order quantity, collection incentive of used products and lower limit of quality level for recycling affect the expected profits of each member and the whole supply chain under both a decentralized GSC (DGSC) and an integrated GSC (IGSC). The analysis numerically compares the results under DGSC with those under IGSC for each scenario of product demand. Also, the effect of the quality of the recyclable parts on the optimal decisions is shown. Moreover, supply chain coordination to shift the optimal decisions of IGSC is discussed based on: I) profit ratio, II) Nash bargaining solution, and III) Combination of (I) and (II).

Estimation of the Bulk Density for Recyclable Residential Wastes (폐기물 관리시설 설계를 위한 재활용성 생활폐기물의 겉보기밀도 평가에 관한 연구)

  • Kim, Byung-Tae;Kim, Myeong-Woon;Lee, Chang-Hae
    • Journal of the Korean Institute of Resources Recycling
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    • v.26 no.6
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    • pp.102-107
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    • 2017
  • To estimate the bulk density applying the composition rate for recyclable residential waste, the composition rates by volume and weight basis, the bulk densities of the separated and commingled wastes were investigated four times respectively for recyclable waste of 1,800 kg transported to waste recovery facility. The bulk densities for separated wastes were $379.0kg/m^3$ of glass bottles that is highest and metals, residues, others, cans, plastics in order. The composition rates for each separated waste were changed widely depending on either volume basis or weight basis. The composition rate by weight basis as 40.6% of the glass bottles, 32.6% of the plastics were changed to 60.2% of the plastics and 8.9% of the glass bottles in that by volume basis. The bulk density of the commingled wastes applying the composition rate by volume basis showed the similar value to the measured density than by weight basis. So it was estimated that the composition rate by volume basis was appropriate for determining the bulk density of the commingled recyclable wastes.