• Title, Summary, Keyword: gas co-distillation

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Flavor Components of Poncirus trifoliata (탱자(Poncirus trifoliata)의 향기성분 분석에 관한 연구)

  • Oh, Chang-Hwan;Kim, Jung-Han;Kim, Kyoung-Rae;Ahn, Hey-Joon
    • Korean Journal of Food Science and Technology
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    • v.21 no.6
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    • pp.749-754
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    • 1989
  • The essential oil was prepared by a gas co-distillation method from flavedo of Poncirus trifoliata and was analyzed by GC/ retention index (RI) and GC/MS. The essential oil prepared by a gas co-distillation gave a whole fragrance of Poncirus trifoliata. The identification of the flavor components was performed by multi-dimensional analysis using GC/RI and GC/MS. GC/RI and GC/MS were complementary to each other. In applying GC/RI for identification, it was more effective when two columns of different polarities were used. Thirty volatile flavor constituents were identified in Poncirus trifoliata. Limonene, myrcene, ${\beta}-caryophyllene,\;trans-{\beta}-ocimene$, ${\beta}-pinene$, 3-thujene and 7-geranyloxycoumarin were the major constituents and cis-3-hexenyl acetate, n-hexyl acetate, 2-methyl acetophenone, elixene and elemicine had not been reported earlier as citrus components.

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SEPARATION AND PURIFICATION PROCESS OF DEMO PLANT FOR 10TON PER DAY DME PRODUCTION (일일 10톤 DME 생산 Demo Plant에서의 분리정제 공정)

  • Ra Young Jin;Cho Wonihl;Shin Dong Geun;Lim Gye Gue
    • 한국가스학회:학술대회논문집
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    • pp.141-145
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    • 2005
  • DME (Di-Methyl Ether) is a new clean fuel and an environmental-friendly energy resource, also is recently increasing with an alternative interest because of the industrial use. DME has been shown to have excellent properties as a diesel fuel giving emission level better than ULEV standard. So it has been attracting considerable as an alternative diesel fuel. In this study, we carried out simulation of separation and purification process of demo plant for 101on per day DME production, which cause the effect that is important in productivity, from operation results of pilot plant for 50kg per day DME production. The liquefied stream, which was separated by gas-liquid separator after DME reactor, includes $CO_2$, DME, Methanol and $H_2O$. We established three distillation columns for separation and purification of the stream. $CO_2$ was extracted from the stream by first distillation column, DME was extracted by second column and Methanol was extracted by third column. We investigated and analyzed the effect which the actual operation variables cause in efficiency of process and optimized process, finally we got the DME of purity $100\%$.

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Comparative Sampling Procedures for the Volatile Flavor Components of Codonopsis lanceolata (전처리 방법에 따른 더덕(Codonopsis lanceolata)의 휘발성 향기성분 비교 분석)

  • Kim, Jung-Han;Kim, Kyoung-Rae;Kim, Jae-Jung;Oh, Chang-Hwan
    • Korean Journal of Food Science and Technology
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    • v.24 no.2
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    • pp.171-176
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    • 1992
  • Volatile flavor components of Codonopsis lanceolata were extracted by gas co-distillation (GCD), solvent extraction/fractionation (SEF), and headspace sampling (HSS) methods. The extracts were analyzed by dual-capillary gas chromatography-retention index (GC-RI) and gas chromatography-mass spectrometry(GC-MS). The two extracts prepared by SEF and HSS gave more similar fragrance to the Codonopsis lanceolata than the GCD extract. The GC profiles of the SEF and HSS extracts were similar to each other except for differences in peak areas. The extract prepared by SEF gave a sweet note while the extract prepared by HSS gave a green note. The GCD extract began to give a burnt note of herb medicine with prolonged distillation. Rapid extraction of flavor components from Codonopsis lanceolata was possible in several short steps by SEF and HSS methods compared to GCD. GC-MS and GC-RI were used for peak identification. GC-RI was more effective for identification of isomers, and polar FFAP column was more suitable for identification of polar compounds. From Codonopsis lanceolata we identified 35 volatile flavor constituents, 24 of which have not been previously reported by simultaneous distillation extraction method $^{(5)}$. trans-2-Hexanal, cis-3-hexen-1-ol, trans-2-hexen-1-ol, and hexanol were considered key components of the green note and 1-octen-3-ol, the component of the fresh note. Esters, including amyl propionate, seem to be responsible for the sweet note particular to Codonopsis lanceolata.

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Flavor Components of the Fruit Peel and Leaf Oil from Zanthoxylum piperitum DC (초피(Zanthoxylum piperitum DC)의 과피와 잎의 방향성분)

  • Kim, Jung-Han;Lee, Kyung-Seok;Oh, Won-Taek;Kim, Kyoung-Rae
    • Korean Journal of Food Science and Technology
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    • v.21 no.4
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    • pp.562-568
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    • 1989
  • The essential oils from ripe fruit peel and leaf of Zanthoxylum piperitum DC were extracted by gas co-distillation method and analyzed by gas chromatography/mass spectrometry (GC/ MS) and retention index matching. The experimental results revealed the presence of over 100 volatile components. Major components were 1,8-cineol (25.47%), limonene (11.91%), geranyl acetate (9.01%), myrcene (6.15%) in fruit peel and citronellal (23.11%), 1,8-cineol (18.38%), citronellol (6.04%) in leaf. Among the components identified were the following; in fruit peel, ${\alpha}-pinene$ and 13 hydrocarbons, linalool and 8 alcohols, citronellal and 3 aldehydes, carvone and 2 kotones, methyl salicylate and 7 esters, and 1,8-cineol and oxides, and in leaf, ${\alpha}-pinene$ and 7 hydrocarbons, linalool and 7 alcohols, citronellyl acetate and 5 esters, citronellal and 1 aldehyde, carvone, and 1,8-cineol and 1 oxide.

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How to Eliminate CO, CO2 and CH4 in H2 & Inert Gas -Possibility of Fuel Cell Application- (수소와 불활성 가스 중 일산화탄소, 이산화탄소, 메탄 제거에 관한 연구 -연료전지에의 적용 가능성-)

  • Lee, Taek-Hong;Cheon, Young-Ki
    • Transactions of the Korean hydrogen and new energy society
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    • v.15 no.3
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    • pp.220-227
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    • 2004
  • The purpose of this paper is, based on the theoretical background of the principle of gas purification and absorption, and the absorbing ability of metals, to syudy the efficiency of gas purification of inorganic gases using Zr alloys, so as to contribute to the IT industry. To produce and distribute gas with high purity and ultra-high purity, different types of gas purifier are currently being used: distillation type, getter type, catalyst type, absorption at low-temperature type, and membrane separation equipment. From the different purification methods mentioned above, the getter type gas purifier is capable of not only high performance and capacity but also P.O.U(Point Of Use) method. The key of the getter type gas purifier is its efficiency of gas purification, which is the subject chosen for this study.

Analysis of the Volatile Components in Red Bean (Vigna angularis)

  • Kim, Joo-Shin;Chung, Hau-Yin
    • Journal of Applied Biological Chemistry
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    • v.50 no.3
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    • pp.120-126
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    • 2007
  • Volatile components in red bean (Vigna angularis) were investigated. Extracts prepared by simultaneous steam distillation and solvent extraction were analyzed by gas chromatography/mass spectrometry. One hundred and forty-two components including alkanes/alkenes (17), aromatics (5), furans (15), miscellaneous compounds (2), other nitrogen-containing compounds (11), aldehydes (11), naphthalenes (11), alcohols (34), ketones (23), sulfur-containing compounds (5) and esters (8) were identified. Some of these components, e.g. hexanal, were known to contribute to the "beany" odor in other beans. Due to the presence of such odor, red beans may not be acceptable to some consumers.

In-Service Identification of the Heterogeneous Zone in Petrochemical Pipelines by Using Sealed Gamma-Ray Sources $(^{60}Co,\;^{137}Cs)$

  • Kim, Jin-Seop;Jung, Sung-Hee;Kim, Jong-Bum
    • Journal of the Korean Society for Nondestructive Testing
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    • v.26 no.3
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    • pp.169-173
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    • 2006
  • In-service diagnoses of pipeline facilities are important for a systematic maintenance of them. Field applications by using sealed gamma-ray sources $(^{60}Co,\;^{137}Cs)$ were performed to identify the heterogeneous zone in the pipelines of a distillation tower and a flare stack respectively. From the results, the heterogeneous zones in the pipelines were successfully identified. In the case of the pipeline connected to the distillation tower, a vapor pocket was detected in the fluid under hydrodynamic conditions, which could explain the reason for a decrease of the flow rate. In another case, an area with some amount of catalyst deposits was found at the bottom of the gas pipeline which was connected to the flare stack. And these findings provided important information for the process operators. Diagnosis technique by using gamma radiation sources has been proven to be an effective and reliable method for providing information on a media distribution in a facility.

Study of Pyrolysis Behavior of Alberta Oil Sand by Continuous Operation of Fluidized-Bed Reactor (Alberta 오일샌드의 유동층 열분해 연속실험을 통한 열분해 특성 파악)

  • Shin, Jong-Seon;Sun, Yang Kuk;Park, Young Cheol;Bae, Dal-Hee;Jo, Sung-Ho;Shun, Dowon
    • Korean Chemical Engineering Research
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    • v.48 no.1
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    • pp.68-74
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    • 2010
  • In this study, fluidized-bed pyrolysis has been conducted in order to recover the bitumen contained in the oil sand. Canada Alberta oil sand contains 11.9% of bitumen and the bitumen-derived heavy oil produced in fluidizedbed tends to be upgraded relative to the bitumen. The continuous operation has been performed using $N_2$ as a fluidization gas at 1 atm and $500^{\circ}C$ in a reactor of 170 cm height. The results showed 87.76% of bitumen conversion, where liquid products are 74.45% and gas products are 13.31%. $H_2$, $O_2$, CO, $CO_2$, $CH_4$, and NO and $C_1{\sim}C_4$ hydrocarbons in the gas products were analyzed by on-line gas analyzer and gas chromatography, respectively. The pyrolysis oil was analyzed by using proximate analysis, heavy metal analysis, SIMDIS, asphaltenes, and heating value. By SIMDIS analysis, naphtha was 11.50%, middle distillation was 44.83% and heavy oil was 43.66%. It was obvious that the pyrolysis oil was upgraded compared with bitumens.

Characteristics of $SF_6$ Gas Recycling Processes ($SF_6$가스 회수 공정들의 특성 연구)

  • Cho, Hoon;Woo, Dae-Sik;Choi, Yu-Mi;Han, Myung-Wan
    • Clean Technology
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    • v.17 no.4
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    • pp.329-335
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    • 2011
  • $SF_6$ gas is well known as a global warming gas. Global warming potential of $SF_6$ gas is 22,000 times higher than that of $CO_2$. Recycling of $SF_6$ gas is an essential technology for the sake of the environment and the economy. The recovery processes of $SF_6$ gas studied in this work were liquefaction, distillation, and crystallization processes because these processes were thought to be easily carried to the fields for recycling waste $SF_6$ gas. The processes were simulated and optimized using Aspen plus. The optimization problems were formulated to minimize energy consumption with satisfying product specification and desired recovery. The performance of the processes was compared based on the optimization results. Effects of major process variables on the recovery performance were investigated and optimal operation guide for changing product specification and product recovery was provided.

Characterization of Volatile Components in Field Bean (Dolichos lablab) Obtained by Simultaneous Steam Distillation and Solvent Extraction

  • Kim, Joo-Shin;Chung, Hau-Yin
    • Preventive Nutrition and Food Science
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    • v.13 no.1
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    • pp.18-22
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    • 2008
  • Volatile components in field bean (Dolichos lablab) were collected by simultaneous steam distillation and solvent extraction and analyzed by gas chromatography-mass spectrometry. One hundred and five components were identified including alcohols (32), ketones (18), aldehydes (9), acid (1), alkanes (5), aromatics compounds (4), esters (2), furans (2), naphthalene (1), pyrazines (4), pyridine (3), sulfur-containing compounds (4) and terpenes (7) and miscellaneous compounds (13). Relatively high concentration of n-hexanal found in the field bean might be undesirable to some consumers.