• Title, Summary, Keyword: Recyclable

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Novel Tri- and Tetra-substituted Pyrimido[4,5-d]pyridazines: Regiospecific Synthesis Catalyzed by Silica Supported Yttrium Trinitrate

  • Karami, Bahador;Akrami, Sedigheh;Khodabakhshi, Saeed
    • Bulletin of the Korean Chemical Society
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    • v.34 no.12
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    • pp.3677-3680
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    • 2013
  • Novel tri- and tetra-substituted pyrimido[4,5-d]pyridazines-2(1H,3H,7H)-ones have been synthesized via the regiospecific condensation reaction of hydrazine derivatives with 5-acetyl-4-aryloyl-6-methyl-3,4-dihydropyrimidinones in the presence of $SiO_2-Y(NO_3)_3$ as a green and recyclable catalyst under solvent-free conditions. All products were obtained in high yields and short reaction time. Employing this method is in accord with green chemistry principles.

Development of New Fluorescent Whitening Agent with 4,4'-Di((E)-styryl)-1,1'-biphenyl Skeleton Attached with Aromatic Ester from Recyclable Source MFB (재사용이 가능한 MFB로부터 Aromatic Ester가 도입된 4,4'-Di((E)-styryl)-1,1'-biphenyl의 골격을 갖는 새로운 Fluorescent Whitening Agent의 개발 연구)

  • Alkhalaf, Norah. S.;Kim, Seok Chan
    • Applied Chemistry for Engineering
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    • v.29 no.3
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    • pp.303-306
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    • 2018
  • Methyl 4-formylbenzoate (MFB), a by-product of the DMT production process, which has been disposed, was used as a starting material for the synthesis of six new fluorescent whitening agent's candidates with 4,4'-di((E)-styryl)-1,1'-biphenyl skeleton attached with an aromatic ester, the same as that of the commercial product family. All candidates were synthesized by the reaction of MFB, and its derivatives with tetraethyl biphenyl-4,4'-diylbis(methylene)diphosphonate using Wittig-Horner reaction. UV spectra for all candidates were recorded and the data were used for calculating the molar absorptivity in order to confirm the usability as a fluorescent whitening agent. All of them showed overall molar extinction coefficients (log ${\varepsilon}$ 4.59~5.00) similar to those of conventional commercial products (log ${\varepsilon}$ 4.85). In particular, compounds 16 and 17 having a dimethoxyphenyl group exhibited a molar extinction coefficient superior to those of conventional commercial products, and thus a field testing for commercialization will be conducted.

Environmentally Friendly Moisture-proof Paper with Superior Moisture Proof Property (I) -Properties of Moisture Proof Chemicals- (방습 효과가 우수한 환경친화적 방습지(제1보) -방습제의 특성-)

  • 유재국;조욱기;이명구
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.33 no.4
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    • pp.15-20
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    • 2001
  • The function of the moisture-proof paper is to prevent moisture from adsorbing into the packed goods. Water-vapor transmission rate of the moisture-proof paper should be less than 100g/$m^2$.24hr and the optimum rate would be less than 50g/$m^2$.24hr. In general the moisture-proof paper has been made by laminating polyethylene or polypropylene on top of the base paper. However this kind of moisture-proof paper has a problem in recycling so that it brings about environmental pollution. In general the moisture-proof paper has been made by laminating polyethylene or polypropylene on top of the base paper. However this kind of moisture-proof paper has a problem in recycling so that it brings about environmental pollution. The purpose of this paper was to make moisture-proof paper using the mixture of SB latex and wax emulsion which was recyclable and environmentally friendly. Water vapor transmission rate showed less than 50g/$m^2$.24hr in mixture ratio of 85:15, 87:13, 90:10. Especially the mixture ratio of 87:13 showed the most favorable water-vapor transmission rate. However, the moisture-proof layer was destroyed slightly by folding in packing. It has been observed that there was no close relationship between water-vapor transmission rate of the moisture-proof paper and grammage of the base paper, but the density of base paper had influenced on water vapor transmission rate. It was also observed that the moisture-proof paper could be recycled. The moisture-proof paper was similar to base paper in degree of the pulping, and there was no significant difference in dispersion between moisture-proof paper and base paper. Most of wax particles which caused the spots during drying process could be removed by flotation process. Tensile strength and tear strength of both moisture-proof paper and base paper after pulping were measured to examine the fiber bonding, and no significant difference in physical properties was observed.

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Development of New Fluorescent Whitening Agent with 4,4'-Di((E)-styryl)-1,1'-biphenyl Skeleton from Recyclable Source MFB (재사용이 가능한 methyl 4-formylbenzoate로부터 4,4'-di((E)-styryl)-1,1'-biphenyl 골격 구조를 갖는 새로운 형광증백제 개발 연구)

  • Chung, Hyun Ju;Yang, Yun Seung;Kim, Seok Chan
    • Applied Chemistry for Engineering
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    • v.28 no.3
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    • pp.294-298
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    • 2017
  • Six new fluorescent whitening agent's candidates with 4,4'-di((E)-styryl)-1,1'-biphenyl skeleton which is the same as that of Uvitex FP family were synthesized using methyl 4-formylbenzoate (MFB) as a starting material. MFB has been disposed as a by-product of dimethyl terephthalate (DMT) production process. Six candidates were synthesized by the reaction of MFB, and its derivatives with tetraethyl biphenyl-4,4'-diylbis(methylene)diphosphonate (3) using Wittig-Horner reaction. A series of UV spectra were recorded and the results were used for estimating molar absorptivities of each candidates in order to find their potential application as fluorescent whitening agents. Considering the molar absorptivity (log ${\varepsilon}$ 3.95~2.60) for all candidates was lower than that of the commercial Uvitex FP 127 (log ${\varepsilon}$ 4.85), it was concluded that they are not suitable for fluorescent whitening agent applications.

Locational Characteristics of Recycling Industries (재생용 사업의 입지적 특성)

  • Han, Ju-Seong
    • Journal of the Korean association of regional geographers
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    • v.10 no.4
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    • pp.775-786
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    • 2004
  • Establishments of wholesale of recycling materials are located in the region where an amount of recyclable wastes generated as artery industry developed and the region of rather many population. And they are located not in underpopulated area as noxious facilities, but located in the non-residential area of many population regions in the whole country. Also, establishments of recycling of metal wastes and scrap, and non-metal wastes and scrap are mainly located in the peripheral region of metropolitan cities, regional centered cities, and adjacent regions of industrial area, because of high coefficient of localization, and agglomerated effects of production. The factor influencing the location of recycling industries is deeply connected with the location of wholesale of recycling materials, and thus, the transportation costs to carry recycling materials from supplied regions to plants are important but population is not so important.

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Process Development of 4,4'-Bis(2-benzoxazolyl)stilbene from Recyclable Source MFB (재사용이 가능한 MFB로부터 4,4'-Bis(2-benzoxazolyl)stilbene의 합성 공정 개발)

  • Ryu, Young;Kim, Jong Cheon;Ham, Mi Jeong;Kim, Seok Chan
    • Applied Chemistry for Engineering
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    • v.27 no.2
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    • pp.195-198
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    • 2016
  • A total four-step synthetic process of high quality optical brightening agent 4,4'-bis(2-benzoxazolyl)stilbene (BBS) from methyl 4-formylbenzoate (MFB) was developed with 73% total yield. MFB is one of the main by-products in dimethyl terephthalate (DMT) production process. Our process involves the formation of 4,4'-stilbenedicarboxylate (2) obtained from the reaction of an aldehyde in MFB with ethyl 4-((diethoxyphosphoryl)methyl)benzoate (1) and the subsequent transformation to 4,4'-stilbenedicarbonyl chloride (3). In order to prepare benzoxazole ring in BBS, various solvents and catalysts were studied. The best solvent and catalyst were found to be 1,2,4-trichlorobenzene and boric acid, respectively suitable for mass production of BBS.

Recyclable Polymeric Composite with High Thermal Conductivity (재활용 가능한 고방열 고분자 복합소재 개발)

  • Shin, Haeun;Kim, Chae Bin;Ahn, Seokhoon;Kim, Doohun;Lim, Jong Kuk;Goh, Munju
    • Composites Research
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    • v.32 no.6
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    • pp.319-326
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    • 2019
  • To address tremendous needs for developing efficiently heat dissipating material with lightweights, a new class of polymer possessing recyclable and malleable characteristics was synthesized for incorporating model functional hexagonal boron nitride (h-BN) filler. A good interfacial affinity between the polymer matrix and the filler along with shear force generated upon manufacturing the composite yielded the final product bearing highly aligned filler via simple hot pressing method. For this reason, the composite exhibited a high thermal conductivity of 13.8 W/mK. Moreover, it was possible to recover the h-BN from the composite without physical/chemical denaturation of the filler by chemically depolymerizing the matrix, thus the recovered filler can be re-used in the future. We believe this polymer could be beneficial as matrix for incorporating many other functional fillers, thus they may find applications in various polymeric composite related fields.

Selection of Environmentally Conscious Manufacturing's Program Using Multi-Criteria Decision Making: A Case Study in Electronic Company

  • Sutapa, I. Nyoman;Panjaitan, Togar W.S.
    • Industrial Engineering and Management Systems
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    • v.10 no.2
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    • pp.123-127
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    • 2011
  • Nowadays, green purchasing, stop global warming, love the mother earth, and others that related to environment become hot issues. Manufactures industries tend to more active and responsive to those issues by adopting green strategies or program like Environmentally Conscious Manufacturing (ECM). In this article, an electronic company had applied 12 ECM Program and tries to choose one of those programs using 6 criteria, such as total cost involved, quality, recyclable material, process waste reduction, packaging waste reduction, and regulation compliance. By using multi-criteria decision making model, i.e. Analytical Hierarchy Process (AHP), Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), and Modified TOPSIS methods, the ECM Program 9 (Open pit) is the best option.