• Title/Summary/Keyword: cyclohexylamine

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An Efficient Method for the Production of Cyclohexylamine from Cyclohexanone and Ammonia over Cu-Cr-La/γ-Al2O3

  • Qin, Shuanglin;Wang, Pan;Huang, Shuangping;Liu, Shuai;Wang, Gaopeng;Wang, Liping;Sun, Meng;Wang, Xiaoji
    • Journal of the Korean Chemical Society
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    • v.59 no.6
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    • pp.493-498
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    • 2015
  • The reductive amination of cyclohexanone with ammonia over Cu-Cr-a/γ-Al2O3 was investigated. It was found that a proper solvent with high solubility of ammonia and 4Å molecular sieves for the elimination of generated water contributed to the formation of cyclohexylamine in the premixing process. In addition, the addition of ammonia in the fixedbed reactor could obviously improve the conversion of cyclohexanone to cyclohexylamine. Finally, reaction conditions including reaction temperature, hydrogen pressure and charging rate of the premix were optimized. Under the optimized conditions, cyclohexylamine was obtained in 83.06% yield.

Optimization of Maillard Reaction between Glucosamine and Other Precursors by Measuring Browning with a Spectrophotometer

  • Ogutu, Benrick;Kim, Ye-Joo;Kim, Dae-Wook;Oh, Sang-Chul;Hong, Dong-Lee;Lee, Yang-Bong
    • Preventive Nutrition and Food Science
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    • v.22 no.3
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    • pp.211-215
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    • 2017
  • The individual Maillard reactions of glucose, glucosamine, cyclohexylamine, and benzylamine were studied at a fixed temperature of $120^{\circ}C$ under different durations by monitoring the absorbance of the final products at 425 nm. Glucosamine was the most individually reactive compound, whereas the reactions of glucose, cyclohexylamine, and benzylamine were not significantly different from each other. Maillard reactions of reaction mixtures consisting of glucosaminecyclohexylamine, glucosamine-benzylamine, glucose-cyclohexylamine, and glucose-benzylamine were also studied using different concentration ratios under different durations at a fixed temperature of $120^{\circ}C$ and pH 9. Maillard reactions in the pairs involving glucosamine were observed to be more intense than those of the pairs involving glucose. Finally, with respect to the concentration ratios, it was observed that in most instances, optimal activity was realized, when the reaction mixtures were in the ratio of 1:1.

Absorption Properties of $CO_2$ in Aqueous Solutions of Piperazine, Piperidine, Cyclohexylamine (Piperazine, Piperidine, Cyclohexylamine 수용액에 대한 이산화탄소의 흡수특성)

  • Song Ho-Jun;Lee Seoungmoon;Song Hocheol;Ahn Se-Woong;Park Jin-won
    • Journal of Energy Engineering
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    • v.14 no.4 s.44
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    • pp.219-225
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    • 2005
  • for the removal of carbon dioxide in flue gas, which is the main cause of the global warming, chemical absorption methods were widely used for years. Alkanolamines such as MEA, AMP, MDEA are mainly used as an absorbent. In this study, cyclic amines - Piperazine, Piperidine and Cyclohelylamine are investigated to compare the chemical solubilities, absorption capacities and rate ot reaction. In conclusion, Piperazine is the most effective absorbent of $CO_2$ and ran be the excellent alternative to the former absorbents. Experiments were performed at 5, 10, 15 weight percent, 30, 40, $50^{\circ}C$, and the gas solubilities are determined by back-titration method, and using Gas Chromatography the absorption rate was compared.

Preparation of ZnO nanorods by hydrothermal method and their $NO_2$ sensing characteristics (수열합성법을 이용한 ZnO 나노로드의 제조 및 이산화질소 감응 특성)

  • Cho, Pyeong-Seok;Kim, Ki-Won;Lee, Jong-Heun
    • Journal of the Korean Vacuum Society
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    • v.15 no.5
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    • pp.506-511
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    • 2006
  • ZnO nanorods were prepared by the hydrothermal reaction of a solution containing $Zn(NO_3)_2{\cdot}6H_2O$, NaOH, cyclohexylamine, ethanol and water, and their $NO_2$ and CO sensing behaviors were investigated. By the control of water concentration in solution, the morphology and agglomeration of ZnO nanorods could be manipulated, which is associated with the variation of $[OH^-]$ resulted from an interaction between water and cyclohexylamine. Sea-urchin-like and well-dispersed ZnO nanorods were prepared at low and high water content, respectively. Well-dispersed ZnO nanorods showed 1.8 fold change in resistance at 1 ppm $NO_2$ while there was no significant change in resistance at 50 ppm CO. This selective detection of $NO_2$ in the presence of CO can be used in automated car ventilation systems.

Effect of Polyamines on Formation of Adventitious Roots, Trichomes and Calli by NAA in Leaf Segment Cultures of Arabidopsis thaliana (애기장대 잎 절편 배양시 NAA 농도에 따른 부정근, 모용 및 캘러스 형성에 미치는 Polyamine의 영향)

  • 한태진;홍종필;김준철;임창진;진창덕
    • Korean Journal of Plant Tissue Culture
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    • v.27 no.2
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    • pp.117-123
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    • 2000
  • In order to study the role of polyamines on the formation of adventitious roots, trichomes and calli, the effects of putrescine, spermidine, spermine, cyclohexylamine (CHA) and methylglyoxal-bis(guanylhydrazone) (MGBG) were investigated in the leaf segment cultures from ecotype Columbia of Arabidopsis thaliana. When the leaf segments were cultured on the media for forming adventitious roots (0.1 mg/L NAA), trichomes (2.0 mg/L NAA) and calli (10.0 mg/L NAA), and then each cultures was treated with 1-100 mg/L of putrescine, spermidine and spermine, respectively. On the adventitious root-forming medium treated with polyamines the trichomes were induced with adventitious roots. And on the trichome-forming medium with polyamines calli were induced with trichomes. In orther hand each cultures was treated with 1-100 mg/L of CHA and MGBG, respectively. CHA promoted adventitious roots on the medium for adventitious roots, was not effected on media for trichomes and calli. MGBG inhibited adventitious roots, trichomes and calli in all cultures, and induced adventitious roots on medium for trichomes in high concentration.

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Multivariate Analysis and Gas Chromatographic Determination of the Smelly Nitro Compounds in Dried-Fishes (GC에 의한 건어물 냄새성분중 질소화합물 분석과 다변량해석)

  • Bae, Sun Young;Lee, Dong Sun
    • Journal of the Korean Chemical Society
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    • v.41 no.2
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    • pp.105-112
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    • 1997
  • The smelly nitro compounds were extracted from dried fishes by simultanous distillation and extraction, then were analyzed by GC-MS. Carbon number and order of an amine could be predicted by using retention time and equivalent chain length. Anchovy, codfish, imitation crab meat, cuttle fish, file fish, pollack, shrimp, octopus, harvest fish, and hard-shelled mussel were used for this investigation. Various smelly nitro compounds such as methylamine, acetamide, thiazole, 2-hydroxy isopropylamine, N-methyl pyrroline, piperidine, cyclohexylamine were identified, however, dimethylamine, trimethylamine, diethylamine were not detected. Principal components analysis was applied to GC-MS profiles for pattern recognition of smelly nitro compounds in dried fishes. Multivariate aspects using principal components analysis were very useful for pattern recognition of smelly components, category similarity.

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Effects of Cyclohexylamine and Polyamines on the Adventitious Root Formation from Soybean Cotyledons (Cyclohexylamine과 Polyamine이 대두 자엽의 부정근 형성에 미치는 영향)

  • 한태진;조형일
    • Korean Journal of Plant Tissue Culture
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    • v.21 no.4
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    • pp.207-213
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    • 1994
  • In order to study the effect of cyclohexylamine (CHA) and polyamines during adventitious root formation, the correlation of adventitious root formation with endogenous polyamine content was investigated in inoculated soybean cotyledons at the rooting medium supplemented with CHA, spermidine and spermine. Adventitious root formation was inhibited in medium containing 10$^{-3}$ -10$^{-2}$ M CHA. Adventitious root formation was not formed in treatment with 10$^{-2}$ M CHA plus polyamine. It was inhibited in 2.5 $\times$ 10$^{-3}$ M CHA alone and reverved in 2.5 $\times$ 10$^{-3}$ M CHA plus 10$^{-4}$ M spermine. Putrescine content was lower in 10$^{-2}$ M CHA and 10$^{-2}$ M CHAplus 10$^{-4}$ M spermine treatment than in control after 3 days of incubation. However, it was higher in 2.5 $\times$ 10$^{-3}$ M CHA and 2.5 $\times$ 10$^{-3}$ M CHA plus 10$^{-4}$ M spermine treatment than in control. Spermine content was higher in all CHA treatments than in control, while spermidine content was lower than in control.

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Thickener Syntheses and Structure Analysis of Di-Urea Grease (Di-Urea 그리이스 증주제 합성과 구조분석에 관한 연구)

  • 엄기청;정근우;조원오;김영운;서인옥;임수진;박교범
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1998.10a
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    • pp.306-312
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    • 1998
  • This paper describes syntheses of thickener for di-urea grease using constant velocity joint. The thickeners of di-urea grease were synthesized by reaction of diisocyanate with various alkylamines, hexylamine, octylamine, stearylamine and cyclohexylamine at high temperatxire. The synthesized thickener were analyzed by FT-IR spectroscopy and two kinds of Mass spectroscopy (EI & FAB). Dropping point and Consistency of synthesized di-urea grease were determined.

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A Study on Roll Stability of Di-Urea Greases (Oi-Urea 그리이스의 알킬기 변화에 따른 Roll Stability에 과한 연구)

  • 조원오;김영운;정근우;이기헌
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1999.11a
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    • pp.247-256
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    • 1999
  • This paper describes the results of analysis, syntheses and Roll Stability of various Di-urea greases. Di-urea greases were synthesized by reaction of 4,4'-Methylenebis(phenyl isocyanate) and various amines, such as cyclohexylamine, octylamine, stearylamine and p-toluidine with base oil at 80-180 $^{\circ}C$. The synthesized di-urea greases were analyzed by FT-R spectroscopy. The Roll Stability of synthesized di-urea greases was evaluated.

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The Study of Cyclophosphamide Metabolite $^{15}N-Isophosphamide$ Mustard (항암제인 Cyclophosphamide의 중간체인 $^{15}N-Isophosphoramide$ Mustard에 관한 연구)

  • Koo, Kyo-Im;Ryem, Kon
    • YAKHAK HOEJI
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    • v.38 no.6
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    • pp.673-676
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    • 1994
  • The each nitrogen site of ifosfamide metabolite isophosphoramide mustard was synthesized with isotope enriched nitrogen. $Gylcine-^{15}N$ was converted to $2-chloroethylamine-^{15}N$ hydrochloride which was then reacted with phenyl dichlorophosphate to provide $N,N'-bis(2-chloroethyl)phosphordiamidic-^{15}N_2$ acid phenylester(50%, $PhO(O)^{15}N(CH_2CH_2Cl_2)$. Catalytic hydrogenation of this phenyl ester followed by the addition of cyclohexylamine (CHA) provided $IPM-^{15}N$ as the CHA salt(70%).

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