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Simple and efficient synthesis of cyclic carbonates using quaternized glycine as a green catalyst
Tharun, Jose,Mathai, George,Roshan, Roshith,Kathalikkattil, Amal Cherian,Bomi, Kim,Park, Dae-Won The Royal Society of Chemistry 2013 Physical chemistry chemical physics Vol.15 No.23
<P>Microwave-assisted quaternization of glycine (GLY) resulted in the synthesis of an efficient catalyst, quaternized glycine (QGLY), for the solventless synthesis of cyclic carbonates from epoxides and CO<SUB>2</SUB> under mild reaction conditions. Density functional theory was used to simulate the synergistic influence of the COOH group and the halide ion of QGLY in enhancing the catalytic activity.</P> <P>Graphic Abstract</P><P>Microwave-assisted synthesis of quaternized amino acid QGLY, an efficient catalyst for the solventless conversion of CO<SUB>2</SUB> to cyclic carbonates. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cp51158h'> </P>
Microwave-assisted synthesis of cyclic carbonates by a formic acid/KI catalytic system
Tharun, Jose,Mathai, George,Kathalikkattil, Amal Cherian,Roshan, Roshith,Kwak, Joo-Young,Park, Dae-Won The Royal Society of Chemistry 2013 Green chemistry Vol.15 No.6
<P>An environment-friendly synthesis of cyclic carbonates from CO<SUB>2</SUB> and epoxides with a HCOOH/KI catalytic system was performed in a microwave reactor. Various epoxide substrates were subjected to microwave irradiated cycloaddition using a HCOOH/KI catalyst. The effects of reaction parameters like catalyst composition, microwave power, CO<SUB>2</SUB> pressure, and reaction time have been investigated. The synergistic influence of the COOH/KI catalyst in the reaction has been compared with that of an OH/KI system and was theoretically simulated using density functional theory.</P> <P>Graphic Abstract</P><P>An environment-friendly synthesis of cyclic carbonates from CO<SUB>2</SUB> and epoxides with a HCOOH/KI catalytic system was performed in a microwave reactor. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3gc40729b'> </P>
Automatic Inspection of As-Built Piping System for Design Consistency
Tharun Kumar Parepalli(타런 쿠마르 파레팔리),Wonchul Yoo(유원철),Tae-wan Kim(김태완) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.동계
As the exploration for resources moving deeper into the oceans, lifetime and complexity of offshore plants increases, effective management of the plants require high precision built consistent CAD models. This paper presents a new algorithm to automatically detect as-built position of pipes, flanges and elbows which can be extended to tee junction, corresponding to their as-designed models. These positions can be used to modify the CAD model or the construction depending on the difference in as-designed and as-built positions. The algorithm uses Laser Scanned Point Cloud for as-built information and CAD model for the as-designed. The algorithms are implemented based on Point Cloud Library (PCL) and verified with industrial data.
Bill of Materials Template for Each Design Phase in Ship Design Process Using Aras Innovator
Tharun Kumar Parepalli(타런 쿠마르 파레팔리),Myeong-Jo Son(손명조),Boram Kim(김보람),Tae-wan Kim(김태완) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
Recent increase in the competition between the shipyards made the shipyards to provide the end product in lesser time and price with higher quality. In order to achieve these goals, it has become necessary for them to implement a PLM system. In this paper, we propose the use of customized Aras Innovator PLM System integrated with the Shipbuilding CAD software AVEVA Marine in shipyards with focus on the bill of materials (BOM) templates for each design phase of ship. We have analyzed the Ship design process and the outputs at each phase and implemented their BOMs in Aras Innovator, an open source PLM system. Most of the small sized shipyards don’t have both the PLM and ERP Systems. Whereas the medium sized shipyards have ERP Systems. The Aras PLM System does the work of resource planning needed in these types of shipyards. Hence, this PLM system will be able to be adopted newly in small sized shipyards and in place of ERP Systems in medium sized shipyards to be competitive.
Tharun, Jose,Bhin, Kyung-Mi,Roshan, Roshith,Kim, Dong Woo,Kathalikkattil, Amal Cherian,Babu, Robin,Ahn, Hye Young,Won, Yong Sun,Park, Dae-Won The Royal Society of Chemistry 2016 GREEN CHEMISTRY Vol.18 No.8
<P>A novel heterogeneous one-component catalyst was developed by the covalent post functionalization of zeolitic imidazolate framework-90 (ZIF-90) with a pyridinium based ionic liquid (IL) to generate IL supported ZIF-90 (IL-ZIF-90). The synthesized catalyst has been characterized using a range of analytical, spectroscopic, and electron microscopy techniques followed by successful employment for the solventless cycloaddition of epoxides and CO2 to yield cyclic carbonates under mild reaction conditions. The effects of reaction parameters like catalyst amount, reaction time, reaction temperature, and CO2 pressure have been investigated. A reaction mechanism for the IL-ZIF-90 catalyzed PO-CO2 cycloaddition has been proposed on the basis of density functional theory (DFT) calculations. The catalyst system was separable by centrifugation and reused four consecutive times successfully. In general, it can be suggested that IL supported porous metal organic frameworks (MOFs) may introduce a new class of highly porous catalyst species showing excellent CO2 transforming capability.</P>
Bhin, Kyung Mi,Tharun, Jose,Roshan, Kuruppathparambil Roshith,Kim, Dong-Woo,Chung, Yongchul,Park, Dae-Won Elsevier Science B.V. Amsterdam 2017 Journal of CO₂ utilization Vol.17 No.-
<P><B>Abstract</B></P> <P>The catalytic potential of a chloro-functionalized zeolitic imidazolate framework ZIF-95 was investigated for the solventless cycloaddition of carbon dioxide with epoxides. The reaction parameters were optimized and moderate set of reaction conditions (80°C and 1.2MPa CO<SUB>2</SUB> pressure) were chosen for the detailed catalytic study. Eventhough ZIF-95 alone was catalytically active at higher temperatures, the addition of a co-catalyst was found beneficial to bring down the temperature required to achieve high conversions of the substrate. The synergistic effect of the catalyst and the co-catalyst was explored through the investigation of reaction mechanism. The scope of extending the catalysis for other epoxides was verified. The catalyst was successfully recovered and reused for cycloaddition up to 4 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A chloro-functionalized zeolitic imidazolate framework ZIF-95 was synthesized. </LI> <LI> Solventless CO<SUB>2</SUB>-epoxide cycloaddition reaction using ZIF-95 catalyst. </LI> <LI> ZIF-95 was compared with other MOFs. </LI> <LI> ZIF-95 was easily recovered and reused. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
( Robin Babu ),( Jose Tharun ),박대원 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Metal Organic Frameworks (MOFs) have been widely accepted as new generation materials for various applications including CO<sub>2</sub> capture and transformations because of its high surface area, accessible pore volume, ordered porous structures, high adsorption capacity, and diverse means available for functionalization etc. Synthesis of cyclic carbonates from CO<sub>2</sub> and epoxides is 100% atom economical and the most promising pathways that do not utilize phosgene or isocyanate as raw material. UMCM-1-NH<sub>2</sub>, a mesoporous Metal Organic Framework has been synthesized and characterized for its crystallinity and textural properties using various physicochemical techniques. The framework consists of Zn<sub>4</sub>O clusters linked by dicarboxylate and tricarboxylate linkers forming a central mesoporous hexagonal channel surrounded by six microcages. The cooperative influence of Zn<sup>2+</sup> and NH<sub>2-</sub> of UMCM-1-NH<sub>2</sub> was studied for the cycloaddition reaction of CO<sub>2</sub> and allyl glycidyl ether (AGE) to form allyl glycidyl carbonate (AGC). Scope of various parameters like catalyst loading, time, temperature and pressure etc. were studied.