Green Chemistry Research Division

Daejeon, South Korea

Green Chemistry Research Division

Daejeon, South Korea

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Baek S.-Y.,Green Chemistry Research Division | Kim Y.-W.,Green Chemistry Research Division | Yoo S.-H.,Green Chemistry Research Division | Chung K.,Green Chemistry Research Division | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2012

Green corrosion inhibitors, n-dodecyl succinate derivatives containing one (HSE) or two triazole groups (DSE), were prepared by three step reactions, that is, nucleophilic substitution reaction, click coupling reaction, and esterification reaction. The characterization results obtained from 1H NMR, FT-IR, and elemental analysis indicated that the succinate derivatives were synthesized successfully. The rust preventing properties of the final products were also investigated using both ASTM D665 and weight loss methods. It was found that the strength of rust-preventing property due to the presence of succinate derivatives in paraffin oil was largely determined by the concentration of alkyl chains, not by their length or by the types of functional groups. © 2012 American Chemical Society.


Baek S.-Y.,Green Chemistry Research Division | Kim Y.-W.,Green Chemistry Research Division | Chung K.-W.,Green Chemistry Research Division | Yoo S.-H.,Green Chemistry Research Division | Park S.-J.,Inha University
Applied Chemistry for Engineering | Year: 2011

In this paper, a series of alkyl succinic acid esters for base oil were synthesized by condensation reaction of succinic anhydride and fatty alcohol. The structures of the synthesized esters were confirmed by 1H-NMR, FT-IR spectrum and GC analysis. Basic properties of esters such as kinematic viscosity (KV), refractive index (RI), total acid number (TAN) and pour points were measured and lubricating properties such as SRV wear scar diameter (SRV WSD), fraction coefficient (COF) and 4-ball wear (4-ball WSD) were also evaluated. As the results of basic properties, KV, RI and pour point of synthetic esters increased as the carbon chain of the esters increased. Measurement value of total acid number (TAN) was indicated between 0.2∼4 mgKOH/g, and that metal working fluids and pressure working oils are acceptable to use as base oil. Also, lubricating properties of the esters showed as follows: 0.391 ∼0.689 mm of SRV WSD, 0.110∼0.138 of SRV COF and 0.49 ∼0.55 mm of 4-ball WSD depended on the structure of the esters. In a comparison on the lubrication capacity of the SRV test based on polyester TMPTO, SRV WSD result showed that a better performance caused by the alkyl group. On the other hand, SRV COF test was not influenced of the alkyl group which the capacity of the lubricant was sightly diminished than the comparison material, regardless of the alkyl group.


Rode A.B.,Kongju National University | Thajudeen H.,Kongju National University | Chung K.,Green Chemistry Research Division | Kim Y.-W.,Green Chemistry Research Division | Hong I.S.,Kongju National University
Bulletin of the Korean Chemical Society | Year: 2011

1,2,4,5-tetraoxane, mono and dinitrate glycerol carbonate ester derivatives of stearic acid were synthesized along with the known 9(10)-keto methyl sterate, methoxy mono-nitrate and dinitrate of methyl stearate. Their cetane numbers (CNs) were investigated to evaluate their viability for use as CN improvers. The CN performances of tetraoxane and all of the nitrate derivatives were investigated at 500 and 1000 ppm concentrations and compared to that of a traditional CN improver 2-ethylhexyl nitrate (2-EHN). The experimental results suggest that all derivatives evaluated in this study showed better CN improvement than base diesel fuel. Specifically, the 1,2,4,5-tetraoxane derivative of stearic methyl ester was superior to all derivatives studied, also being superior to 2-EHN. We also discussed the correlations between the observed CN trends and thermo-analytical data resulted from thermo gravimetric analysis curves (TGA) and differential scanning calorimetry (DSC).


Yoo S.-H.,Green Chemistry Research Division | Kim Y.-W.,Green Chemistry Research Division | Chung K.,Green Chemistry Research Division | Kim N.-K.,Green Chemistry Research Division | Kim J.-S.,Chosun University
Industrial and Engineering Chemistry Research | Year: 2013

In the present work, the corrosion inhibition properties of three amino acid compounds, glycine (Gly), 2,2′-azanediyldiacetic acid (IDA), 5-aminopentanoic acid (5-APA), and two triazine (Tris) derivatives containing Gly or IDA units were investigated. It was found that the amino acids and their triazine derivatives behaved like mixed-type corrosion inhibitors that reduced oxidative dissolution and retarded a hydrogen emission reaction. In the case of the three amino acids, it was found that the increase in the length and the number carboxylic acid groups of the molecules enhanced the corrosion inhibition properties. It was also observed that the presence of triazine ring enhanced the corrosion inhibition properties significantly. It was suggested that the adsorption of triazine derivatives on a metal surface was the Langmuir isotherm adsorption and mainly physisorption. In the case of Tris-IDA, the six acetic acid moieties emanating from the triazine ring led to partial negative charges on the outer layer and disrupted the physisorption and chemisorption of Tris-IDA on the metal surface. In addition, two acetic acid moieties per IDA caused steric hindrance when Tris-IDA adsorbed onto the metal surface. These results made the corrosion inhibition properties of Tris-IDA lower than those of Tris-Gly. © 2013 American Chemical Society.


Ko K.-H.,Chosun University | Park H.R.,Chosun University | Kim J.-S.,Chosun University | Kim Y.-W.,Green Chemistry Research Division
Journal of Applied Polymer Science | Year: 2013

The effects of the presence of dimer acid (DA) molecules in Na-sulfonated polystyrene (PSSNa) and poly(styrene-co Na-methacrylate) (PSMANa) ionomers on the ionomer properties were investigated using a dynamic mechanical analysis technique. The DA decreased the matrix and cluster Tgs of PSSNa ionomer without changing the ionic modulus, suggesting that the DA resided both in the matrix and cluster regions of PSSNa ionomer and acted mainly as a plasticizer. On the other hand, the DA decreased the cluster Tg of PSMANa ionomer, without changing the matrix Tg, and also increased the ionic modulus, implying that the DA behaved like plasticizer only for the cluster regions. Copyright © 2013 Wiley Periodicals, Inc.


Park H.J.,University of Seoul | Heo H.S.,University of Seoul | Jeon J.-K.,Kongju National University | Kim J.,Korea Advanced Institute of Science and Technology | And 3 more authors.
Applied Catalysis B: Environmental | Year: 2010

The catalytic upgrading of pyrolytic vapors derived from radiata pine sawdust was carried out over mesoporous MFI zeolite synthesized using an amphiphilic organosilane. Its catalytic activity was compared with those of conventional HZSM-5 and mesoporous material from HZSM-5 (MMZZSM-5). The effect of gallium incorporation into mesoporous MFI zeolite on the product distribution and chemical composition of bio-oil was also investigated. The catalysts synthesized were characterized using ICP, XRD, N2-sorption, NH3-TPD, and H2-TPR methods. After catalytic upgrading, products were analyzed by GC-TCD, GC-FID, GC-MS, and Karl Fischer titration. The mesoporous MFI zeolite exhibited the best activity in deoxygenation and aromatization during the upgrading of pyrolytic vapors. In particular, mesoporous MFI zeolite showed high selectivity for highly valuable aromatics, such as benzene, toluene, and xylenes (BTX), even though it decreased the overall organic fraction of the bio-oil. The incorporation of gallium into the mesoporous MFI zeolite increased both the organic fraction of the bio-oil and resistance to coke deposition. Moreover, the selectivity for BTX aromatics was enhanced when the appropriate amount of gallium was introduced. © 2010 Elsevier B.V. All rights reserved.


Lee S.-H.,Korea Institute of Energy Research | Heo H.S.,University of Seoul | Jeong K.-E.,Green Chemistry Research Division | Yim J.-H.,Kongju National University | And 5 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2011

The catalytic cracking of oilsand bitumen was performed over nanoporous materials at atmospheric conditions. The yield of gas increased with application of nanoporous catalysts, with the catalytic conversion to gas highest for Meso-MFI. The cracking activity seemed to correlate with pore size rather than weak acidity or surface area. Copyright © 2011 American Scientific Publishers.


Lee H.I.,Sungkyunkwan University | Kim J.M.,Sungkyunkwan University | Lee J.-Y.,University of Seoul | Park Y.-K.,University of Seoul | And 6 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2010

Copyright © 2010 American Scientific Publishers All rights reserved In this study, 1,2-dichlorobenzene (DCB), an important precursor of PCDDs and PCDFs, was chosen as a suitable model compound for the catalyzed deep oxidation of dioxin. The recently developed mesoporous materials from zeolites (MMZ) were used for the first time as a support for an oxidation catalyst. The catalytic oxidation of 1,2-dichlorobenzene over Pt/MMZ was carried out, and the catalytic activity was compared with that of Pt/γ-Al 2O 3, Pt/Al-MCM-41 and Pt/Beta catalysts. Pt/MMZ showed the highest catalytic activity among the catalysts tested. Interestingly, the catalytic activity of Pt/MMZ was maintained (>40%) at low temperatures (250 °C) at which the other catalysts showed extremely low activity (<5%). The high catalytic activity of Pt/MMZ was attributed to both the sufficient acidity and mesoporosity of the MMZ support.


Choi S.J.,University of Seoul | Park Y.-K.,University of Seoul | Jeong K.-E.,Green Chemistry Research Division | Kim T.-W.,Green Chemistry Research Division | And 4 more authors.
Korean Journal of Chemical Engineering | Year: 2010

The performance of SBA-16 catalysts toward the degradation of two kinds of polyethylenes, high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE), was evaluated by using a thermogravimetric analyzer and batch reactor. The effect of the acidity of SBA-16 upon degradation efficiency was investigated. Quantitative analyses of the products were conducted by GC/MS and GC. The Al-SBA-16 led to a higher catalytic conversion than SBA-16. Hydrocarbons (C7-C10) were mainly produced by Al-SBA-16, whereas a much broader distribution of oil products (C7-C14) was obtained by SBA-16. The Al-SBA-16 also showed high catalytic stability. The results of this study suggest that Al-SBA-16 has a high potential as a catalyst for degradation of waste plastics. © 2010 Korean Institute of Chemical Engineers, Seoul, Korea.


Park J.H.,University of Seoul | Heo H.S.,University of Seoul | Park Y.-K.,University of Seoul | Jeong K.-E.,Green Chemistry Research Division | And 4 more authors.
Korean Journal of Chemical Engineering | Year: 2010

A variety of SAPO-34 catalysts were prepared using various templates, such as tetraethylammonium hydroxide (TEAOH), diethylamine (DEA), and a mixture of TEAOH and DEA, and then applied for the first time to the pyrolysis of high-density polyethylene (HDPE). The crystal morphology and physicochemical properties were affected by the type of template employed. In particular, an inexpensive SAPO-34 catalyst, with good crystal properties and catalytic performance, was obtained using a mixed-template of DEA and TEAOH. Through N2 isotherm, XRD, SEM and NH3 TPD the effects of the mixed-template on the crystal morphology and acidity were investigated. The catalytic activity of SAPO-34 in the pyrolysis of HDPE was improved with the use of a mixed-template, due to the crystal size, surface area and acidity.

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