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HDPE , PP 및 PS 의 등온열분해에 의한 액화 특성
유홍정(Hong Jeong Yu),박수열(Su Yul Park),이봉희(Bong Hee Lee) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.3
N/A Isothermal pyrolysis of high density polyethylene(HDPE), polypropylene(PP) and polystyrene(PS) was performed at 450℃, respectively. The effect of pyrolysis time on yield and product composition was investigated. Conversion and liquid yield obtained during HDPE pyrolysis continuously increased with time up to 80minutes, but those of PP and PS did not largely change after 35minutes. Each liquid product formed during the pyrolysis was classified into gasoline, kerosene, light oil and wax according to the distillation temperature based on the petroleum product quality standard of Korea Petroleum Quality Inspection Institute. The major liquid product of HDPE pyrolysis was light oil(34 wt.% based on the amount of HDPE treated) and the amounts of the other liquid ingredients(gasoline, kerosene and wax) were almost the same. On the other hand, the pyrolysis of PP produced 27 wt.% gasoline, 22 wt.% kerosene, 24 wt.% light oil and 13 wt.% wax, and the pyrolysis of PS produced 56 wt.% gasoline, 12 wt.% kerosene, 9 wt.% light oil and 13 wt.% wax.
유홍정 ( Hong Jeong Yu ),이봉희 ( Bong Hee Lee ),박수열 ( Su Yul Park ) 한국유화학회 2002 한국응용과학기술학회지 Vol.19 No.4
N/A Pyrolysis of polypropylene(PP) was performed to find the effects of the pyrolysis temperature(425, 450, 475 and 500℃) and the pyrolysis time(35, 50 and 65minutes), respectively. Conversion and liquid yield obtained during PP pyrolysis continuously increased with the pyrolysis temperature(up to 500℃) and the pyrolysis time(up to 65minutes), especially these were more sensitive to the pyrolysis time at 425℃ than other pyrolysis temperatures. Each liquid product formed during the pyrolysis was classified into gasoline, kerosene, light oil and wax according to the distillation temperature based on the petroleum product quality standard of Korea Petroleum Quality Inspection Institute. The liquid products of PP pyrolysis up to 450℃ were almost same fractions(26±3wt.% gasoline, 20±2wt.% kerosene and 23±2wt.% light oil) except wax(3∼13wt.%). On the other hand, the pyrolysis of PP from 475℃ to 500℃ produced 26±3wt.% wax, 24±lwt.% gasoline, 18±1wt.% kerosene and 16±1wt.% light oil. After all, the main liquid product changed from gasoline to wax with increasing pyrolysis temperature.
초음파 합성법을 이용한 이리듐계 인광 물질 합성과 합성된 인광 물질의 전계 발광 특성 분석
유홍정 ( Hong Jeong Yu ),정원근 ( Won Keun Chung ),전병희 ( Byung Hee Chun ),김성현 ( Sung Hyun Kim ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.3
Ir(pmb)3 (Iridium(III)Tri(1-phenyl-3-methylbenzimidazolin-2-ylidene-C,C2) was synthesized to develop a deep blue-emitting Ir(III) complex. We suggested the ultrasonic reactor to enhance the poor reaction yield of Ir(pmb)3. The ultrasonic wave enhanced the reaction yield of Ir(pmb)3 because the ultrasound helped non-soluble reactants disperse efficiently and produced free radial during the reaction. The maximum yield of Ir(pmb)3 was 42.5%, which was 4 times higher than conventional method. Organic light emitting devices were fabricated with the synthesized mer-Ir(pmb)3 which emitted at 405 nm. A range of host materials with large bandgaps (UGH2, mCP and CBP) were tested for developing a deep blue emitting device. In case of the device with mCP as the host material, it emitted deep blue and performed quite well relative to the other host materials tested.
CdSe 나노입자 형광층 구조에 따른 백색 LED 발광 특성 연구
정원근 ( Won Keun Chung ),유홍정 ( Hong Jeong Yu ),박선희 ( Sun Hee Park ),전병희 ( Byung Hee Chun ),김성현 ( Sung Hyun Kim ) 한국화학공학회 2011 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.49 No.3
TOPO/TOP capped CdSe nanoparticles were synthesized via thermal-solvent method. The 540nm green and 620 nm red emitting CdSe nanoparticles were obtained by controlling the reaction time and temperature. Phosphor conversion white LED was produced combining a 460 nm emitting InGaN LED chip as an excitation source with 540 and 620 nm CdSe nanoparticles as phosphors. The single or double phosphor layer was fabricated by mixing with epoxy, and investigated the effects on the luminous properties of the white LED. The single phosphor layer white LED showed 5.78 lm/W with CIE of (0.36, 0.45) in reddish white, and the double phosphor layer white LED showed 7.28 lm/W with that of (0.32, 0.34) in pure white at 20 mA. When the 400 nm near-UV LED was applied to optical pumping source, the luminous efficiency of white LED was enhanced to 8.76 lm/W.