• Applied Chemistry for Engineering
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• v.8 no.1
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• pp.8-15
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• 1997

This study was carried out to present a analysis of pyrolytic degradation of 4-hydroxy-3-methoxybenzal dehyde(vanillin) pyrolyzed at $330^{\circ}C{\sim}920^{\circ}C$ by Curie-point pyrolyzer connected with GC/MSD by on-line system. Identified by GC/MSD were 100 pyrolytic products of vanillin. The pyrolysis of the compound gave benzene, phenol, 1,3-cyclopentadiene, methyl benzene, benzaldehyde, benzofuran, and cresol as major products, which were produced by pyrolytic degradation and synthesis of vanillin radicals.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.17 no.4
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• pp.322-334
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• 2007

This study covers the investigation of the actual condition in the workplace to produce plastics products using synthetic resins and the investigation on the trends amount of the domestic production of thermoplastic resins. To analyze the monomers included in thermoplastic resins frequently used in the workplace, we analyzed thermal characteristics for test compounds using thermogravimetric analysis and did the qualitative analysis using Pyrolyzer GC-MSD & TDS GC-MSD. And then we classified the health hazard of monomers based on GHS classification criteria using information toxicity & carcinogenicity. The number of the workplace to produce plastics products among all domestic manufacturers of 73,884 was 4,391 (5.94%). The number of workers to produce plastics products among all workers of 2,522,750 in all domestic manufacturers was 104,971 (4.16%). The amount of production per year for thermoplastic resins is in the order of PP, HDPE, LDPE, PVC, ABS, PS and such compounds was producing over 1 Million ton per year each. The classification result based on GHS classification criteria for 22 main compounds included thermoplastic resins says 2 compounds of acrylonitrile, naphthalene are in Acute oral category 3 and benzene is in Acute dermal category 1. The classification results of health hazard of carcinogenicity based on IARC & ACGIH carcinogen classification says 2 compounds of benzene, vinyl chloride are in category 1A (known to be human carcinogens).

• Journal of the Korean Society of Tobacco Science
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• v.22 no.2
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• pp.176-183
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• 2000

This study was conducted to compare the volatile components of lamina(cutter group) and midrib of flue-cured tobacco leaves by two analytical methods, Curie-Point pyrolysis and Purge & Trap headspace technique. The pyrolysis of lamina and midrib part of tobacco leaves was performed at the temperature of $330^{\circ}C$, $650^{\circ}C$, and $920^{\circ}C$ by Curie-Point Pyrolyzer, and 33 compounds were identified in the pyrolyzates by GC/MSD. The composition of the components identified showed a quite difference between lamina and midrib. However, the amount of the pyrolyzed products from the both of lamina and midrib was increased with temperature increase except that of acetic acid, furfural, and nicotine. The content of phenolic compounds including phenol, 4-methyl phenol, and 3-methyl phenol was higher in midrib than in lamina, while that of furan compounds such as 2,3-dihydrobenzofuran, 5-hydroxymethyl furfural, was high in lamina. Interestingly, acetamide, 2-propenamide and 3-acetoxy pyridine were not defected in the pyrolyzates of lamina. By Purge & Trap headspace technique, 28 volatile components were identified in both lamina and midrib. The composition of the identified compounds and their chromatograpic patterns also showed the complete difference between the two. The content of solanone, $\beta$-damascone, $\beta$-damascenone, and megastigmatrienones, key components of tobacco aroma, was much higher in lamina than in midrib. The results indicate that lamina contains much more carbonyl compounds known to enhance the smoke taste of cigarette, whereas midrib takes nitrogenous and phenolic compounds, which are known to cause a deteriorate effect of smoke such as irritation.

• Journal of the Korean Society of Tobacco Science
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• v.25 no.2
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• pp.103-110
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• 2003

This study was conducted to investigate the pyrolysis products of ι-menthol by Curie-Point pyrolysis. The pyrolysis of ι-menthol was performed at 16$0^{\circ}C$, 42$0^{\circ}C$, $650^{\circ}C$, and 92$0^{\circ}C$ by Curie-Point Pyrolyzer and their pyrolysis products were analyzed by GC/MSD. In addition, tobacco leaves added ι-menthol were pyrolyzed at the same condition in case of ι-menthol. The beginning temperature for pyrolysis formation was in the vicinity of 42$0^{\circ}C$ and the major components of the pyrolysis products identified were iso-menthol, 2-menthene, menthomenthene, and menthone. The amount of these components was increased by increasing temperature and the hydrocarbons such as hexadecene and pentadecene formed by ring cleavage were generated at 92$0^{\circ}C$. The yield of ι-menthol in pyrolysis of tobacco leaves was decreased as the temperature of pyrolysis was raised and the pyrolysis products of ι-menthol weren't identified in the pyrolysis of tobacco leaves. Also, to analyze the weight decrease, ι-menthol was analysed by thermal analyzer(TA), and then the weight decrease of ι-menthol was occurred in the vicinity of 18$0^{\circ}C$.

• Journal of the Korean Society of Tobacco Science
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• v.24 no.2
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• pp.101-106
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• 2002

This study was conducted to investigate the pyrolysis products of patchouli oil by Curie-Point pyrolysis. The pyrolysis of patchouli oil was performed at the temperature of 16$0^{\circ}C$, 42$0^{\circ}C$, $650^{\circ}C$, 76$0^{\circ}C$, and 92$0^{\circ}C$ by Curie-Point Pyrolyzer. The pyrolysis products were analyzed by gas chromatography(GC) and mass selective detector(MSD). Total 21 components were identified in the pyrolyzates of patchouli oil. The temperature for maximum formation of most of these compounds was in the range of 76$0^{\circ}C$~92$0^{\circ}C$. The major components were $\beta$-patchoulene, $\alpha$-guaiene, $\beta$-caryophyllene, $\alpha$-patchoulene, seychellene, $\delta$-guaiene, and patchouli alcohol. The numbers of the pyrolyzed products of patchouli oil were increased by increasing temperature, however, the yields of major components such as patchoulene, guaiene, seychellene and patchouli alcohol decreased as the temperature of pyrolysis was raised to 92$0^{\circ}C$, the highest temperature in this experiment. The optimum temperature for formation of the pyrolysis products such as styrene, indane and naphthalene was at 92$0^{\circ}C$.