• 제목/요약/키워드: Liquid by-product

검색결과 575건 처리시간 0.029초

A Study on the Simulation of Toluene Recovery Process using Sulfolane as a Solvent (Sulfolane 용매를 이용한 톨루엔 회수공정의 모사에 관한 연구)

  • Cho, Jungho
    • Korean Chemical Engineering Research
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    • 제44권2호
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    • pp.129-135
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    • 2006
  • In this study, computer modeling and simulation works were performed to obtain nearly pure toluene product from toluene containing non-aromatic compounds using sulfolane as a solvent through an extractive distillation process. NRTL liquid activity coefficient model was adopted for phase equilibrium calculations and Aspen Plus release 12.1, a commercial process simulator, was used to simulate the extractive distillation process. In this study, it was concluded that the toluene product with a purity of 99.8 percent by weight and a recovery of 99.65 percent was obtained through an extractive distillation process.

Effect of Microbial Product on Microorganisms in Soil and the Growth of Leaf Lettuce (EM 활성액, 키토산 및 목초액 처리가 토양 미생물상의 변화 및 잎 상추의 생육에 미치는 영향)

  • Seok, Woon-Young;Oh, Ju-Sung;Kim, Doh-Hoon;Chung, Won-Bok;Jeong, Soon-Jae
    • Korean Journal of Organic Agriculture
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    • 제12권4호
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    • pp.427-436
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    • 2004
  • This study was conducted to investigate the effect of microbial product on microorganisms in soil and the growth of leaf lettuce. The test material were treated with chitosan, wood vinegar and EM activity liquid, and treatment concentration was 50 times solution and 100 times solution level with foliar application. The results were summarized as follows : Among foliar application of microorganisms treatments diluted by chitosan 100 times solution level was effective considering growth of leaf lettuce as compared other dilutions and control plot. Change of microorganism number in the soil for cultivation of chinese cabbages and leaf lettuce was increased with microorganism treatment plot as compared with control plot. Specially chitosan 100 times solution level showes the most significant effect.

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Preparation of the Metallic Nanopowders by Wire Explosion in Liquid Media (액중 전기폭발에 의한 금속 나노분말 제조)

  • Cho, Chu-Hyun;Kim, Byung-Geol;Park, Sang-Ha;Kang, Chung-Il;Lee, Hong-Sik;Im, Geun-Hie
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • 제55권9호
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    • pp.452-455
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    • 2006
  • The technology of wire explosion have been used to product nanopowders. A new concept was proposed to produce metallic nanosized powders, which is wire explosion in liquid media. We have exploded the Ag or Cu wires of diameter of O.3mm, 40mm long, in the de-ionized water or acetone, respectively. Electrical energy of 1.1kJ was stored in 10uF capacitor and released to the wires through a triggered spark gap switch. The process was observed by high-speed camera. Those images showed that the powders were generated by vapor condensation in the shell formed by shock wave in the water. The particles were directly dispersed into the water with collapse of the shell. The sizes of Ag and Cu nanopowders were evaluated to 35nm and 17nm, respectively.

Development of Vacuum System for Improving Productivity of Fine Multi-hole Sheet Metal Product (미세 다공 박판제품 생산성 향상을 위한 진공 시스템의 개선)

  • Park, Joon-Hong;Kwon, Taek-Hwan;Choi, Young;Kim, Chul;Choi, Jae-Chan
    • Journal of the Korean Society for Precision Engineering
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    • 제17권8호
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    • pp.180-188
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    • 2000
  • Fine multi-hole sheet metal product(FMSMP) is a specific metal plate which is used in color TV and computer monitor. Processes of manufacturing FMSMP are generally composed of coating cleaning exposure and etching processes. After a thin metal plate is made by rolling photosensitive liquid is coated on the metal plate in coating process. Then the coated thin metal plate consecutively passes through exposure process in which upper and lower glasses are compressed by vacuuming the space between glasses and metal plate. In this lowered glasses are compressed by vacuuming the space between glasses and metal plate. In this lowered vacuum state certain part of metal plate is desirably exposed to light and will be etched into forming lots of well-arranged holes with a specific diameter, nowadays to manufacture FMSMP of 17 inch braun tube 80 second is required for complete vacuum but 35 second is applied to manufacture FMSMP in reality. In the present study vacuuming time is tried to reduce for improvement of productivity by analyzing vacuum system and proposing several solutions, for faster vacuuming speed degree of vacuum state between glasses and metal plate is improved by the proposed method and experiments using the proposed method are performed for verification. In addition microstructure of FMSMP is investigated to prevent stain phenomena and to improve quality of the product.

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Development of a Simulation Program to Predict the Performance of the Multi-grade Lubricant before Blending Base Oil with Additives (기유와 첨가제 혼합 전 다등급 윤활유의 성능 예측 시뮬레이션 프로그램 개발)

  • Chun, Sang-Myung
    • Tribology and Lubricants
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    • 제28권2호
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    • pp.47-55
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    • 2012
  • Generally, to product multi-grade oil like engine oil, a sort of mineral base oil is mixed with a fundamental additive package liquid and a polymer liquid as viscosity index improver in order to improve the lubricating property of base oil. That is, engine oil is the mixture of more than two fluids. Specially, a polymeric type liquid cannot be seen as the linear viscosity like Newtonian fluids. In this research, by using the governing equation describing non-Newtonian hydrodynamic lubrication related with the mixture of incompressible fluids based on the principle of continuum mechanics, it will be compared the bearing performance between the mixture of each liquid to be blended and multi-grade engine oil as a single fluid in a high speed hydrodynamic journal bearing. Further, it is to be found the way estimating the performance of the blended multi-grade engine lubricant in a journal bearing in advance before blending by using the physical properties of mineral base oil, fundamental additive liquid and polymer liquid of viscosity index improver. So, it can be reduced the number of trial and error to get the wanted lubricant by selecting the proper volume fraction of each liquid to satisfy the expected performance and estimating in advance the performance of various multi-grade oils before blending. Therefore, it can be shorten the developing time and saved the developing cost.

Comparison of Sensory Traits and Preferences between Food Co-product Fermented Liquid (FCFL)-fed and Formula-fed Pork Loin

  • Sasaki, Keisuke;Nishioka, Terumi;Ishizuka, Yuzuru;Saeki, Mao;Kawashima, Tomoyuki;Irie, Masakazu;Mitsumoto, Mitsuru
    • Asian-Australasian Journal of Animal Sciences
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    • 제20권8호
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    • pp.1272-1277
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    • 2007
  • Sensory traits and preferences regarding food co-product fermented liquid (FCFL)-fed pork loin were compared with those of formula-fed pork. The FCFL-fed pork was expected to have improved fat meltability. Thirty-nine laboratory panelists took part in a sensory test. The fat meat and the lean meat of FCFL-fed pig were judged more meltable and tender, respectively, than the corresponding meat from the formula-fed pig. These sensory traits agreed closely with the results of a mechanical investigation of fat melting patterns and with Warner-Bratzlar shear force values. However, the overall preference was not significantly associated with sensory fat meltability and meat tenderness, as assessed by chi-square and correspondence analyses, but it was significantly related to the whole fat preference and the fat texture preference. The fat texture preference, however, did not correlate with sensory fat meltability. These results indicated that FCFL feeding altered sensory fat meltability in pork loin, but the preference for such meltable fat differed among individual panelists.

Liquefaction Characteristics of HDPE by Pyrolysis (HDPE의 열분해에 의한 액화 특성)

  • 유홍정;이봉희;김대수
    • Polymer(Korea)
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    • 제27권1호
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    • pp.84-89
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    • 2003
  • Pyrolysis of high density polyethylene(HDPE) was carried out to find the effects of temperature and time on the pyrolysis. The starting temperature and activation energy of HDPE pyrolysis increased with increasing heating rate. In general, conversion and liquid yield continuously increased with pyrolysis temperature and pyrolysis time. This tendency is very sensitive with pyrolysis time, especially at 45$0^{\circ}C$. Pyrolysis temperature has more influence on the conversion than pyrolysis time. Each liquid product formed during 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. As a result, the amount of liquid products produced during HDPE pyrolysis at 45$0^{\circ}C$ was in the order of light oil > wax > kerosene > gasoline, and at 475$^{\circ}C$ and 50$0^{\circ}C$, it was wax > light > oil > kerosene > gasoline.

Anticholinesterase activity of Cinnamomum zeylanicum L. leaf extract

  • Dalai, Manoj Kumar;Bhadra, Santanu;Chaudhary, Sushil Kumar;Chanda, Joydeb;Bandyopadhyay, Arun;Mukherjee, Pulok K.
    • CELLMED
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    • 제4권2호
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    • pp.11.1-11.6
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    • 2014
  • Cinnamomum zeylanicum (C. zeylanicum) is a tropical evergreen tree of Lauraceae family. It is one of the oldest culinary spices known and used traditionally in many cultures for centuries. In addition to its culinary uses, cinnamon also possesses as a folk remedy of many health disease condition including analgesic, antiseptic, antispasmodic, aphrodisiac, astringent, carminative, haemostatic, insecticidal, and parasiticide and memory enhancing property. This study was aimed to assess the acetylcholinesterase and butyrylcholinesterase inhibitory activity of standardized methanol extract of the C. zeylanicum. Gas chromatography - mass spectrometry (GC-MS) and high performance liquid chromatography (HPLC) analysis were done to identify the presence of eugenol as chemical component and support the neuroprotective activity in the extract. Anticholinesterase inhibitory activity of crude methanol extract of C. zeylanicum leaves and cinnamon oil were evaluated by 96-well microtiter plate assay and thin layer chromatography bioassay detection methods. This study revealed that cinnamon oil ($IC_{50}:45.88{\pm}1.94{\mu}g/ml$) has better anticholinesterase activity than methanol extract ($IC_{50}:77.78{\pm}0.03{\mu}g/ml$). In HPLC analysis, retention time of eugenol in cinnamon oil was found to be 15.81 min which was comparable with the retention time (15.99 min) of the reference standard, eugenol. Seven chemical compounds were identified by GC-MS analysis, in which eugenol as an important phytoconstituents. Thus the phytochemicals from C. zeylanicum methanol leaves extract could be developed as potential source of anticholinesterase activity, with particular benefit in the symptomatic treatment of Alzheimer's disease.

Mutation Analysis in β2-Adrenergic Receptor Gene by Denaturing High Performance Liquid Chromatography (DHPLC) (DHPLC를 이용한 β2-교감신경수용체 유전자에서의 돌연변이 분석)

  • Park, Sang-Bum;Oh, Chung-Hun;Kim, Jong-Wan;Jang, Won-Cheoul
    • Analytical Science and Technology
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    • 제15권3호
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    • pp.190-195
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    • 2002
  • We analysed mutation of ${\beta}_2$-adrenergic receptor gene that controls bronchial asthma by denaturing high performance liquid chromatography (DHPLC) according to ion-pair reversed-phase high performance liquid chromatography (IP-RP-HPLC). We extracted genomic DNA from 50 asthma patients, amplified DNA using PCR, and analysed PCR product by DHPLC. As a result, we obtained that mutation frequency was 15 (30%) among 50 cases. Consequently DHPLC mutation detection was confirmed that the result of direct sequencing was coincide exactly.

Quality Changes of Seasoned and Smoked Products of Skipjack Tuna (Euthynus pelamis) Captured in the East Sea (동해산 가다랑어 훈연조미제품의 저장 중 품질변화)

  • LEE Jung Min;KIM Sang Moo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • 제37권2호
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    • pp.77-84
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    • 2004
  • The powder and liquid products of seasoned and smoked skipjack tuna (Euthynus pelamis) was manufactured by using small skipjack tuna (1-2 kg, 20-30 cm) captured in the East Sea, Korea. Smoking was done three times at $80^{\circ}C$ for 8 hrs to decrease the moisture content below $15\%.$ The seasoned and smoked skipjack tuna powder with liquid smoke showed the lower pH than the control. The pH, VBN, amino nitrogen content, and TBA value were increased slowly as storage period was increased at room temperature. Liquid smoke decreased the production of animo nitrogen and VBN. Vacuum packaging was efficient for inhibiting the deterioration and the microbial growth of the seasoned and smoked skipjack tuna powder product.