• Title/Summary/Keyword: Hydrazine hydrate

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Preparation of Ag Nano-Powder from Aqueous Silver Nitrate Solution through Reduction with Hydrazine Hydrate (Hydrazine Hydrate 환원(還元)에 의한 질산은(窒酸銀) 수용액(水溶液)으로부터 은(銀) 나노분말(粉末)의 제조(製造) 연구(硏究))

  • Lee, Hwa-Young
    • Resources Recycling
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    • v.15 no.4 s.72
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    • pp.19-26
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    • 2006
  • The preparation of Ag nano-powder from aqueous silver nitrate solution, which would be available for the recycling of silver bearing wastes, was investigated by a reductive precipitation reaction using hydrazine hydrate as a reducing agent. Silver solution was prepared by dissolving silver nitrate with distilled water, and then the dispersant, Tamol NN8906 or Tween 20, was also mixed to avoid the agglomeration of particles during the reductive reaction followed by the addition of hydrazine hydrate to prepare Ag nano-particles. Ag particles obtained from the reduction reaction from silver solution were characterized using the particle size analyzer and TEM to determine the particle size distribution and morphology. It was found that about 100% excess of hydrazine hydrate was required to reduce completely silver ions in the solution. Ag powders with very narrow distribution could be obtained when Tamol NN8906 was used as the dispersant. In case of Tween 20, the particle size distribution showed typically the bimodal or multimodal distribution and the morphology of Ag particles was found to be irregular shape in both cases.

Surface Characterization and Dyeing Property of PET Film Treated with Hydrazine Hydrate in Methanol (Hydrazine/Methanol 처리에 의한 PET film의 표면특성과 염색성)

  • 성우경;조현혹;김경환
    • Textile Coloration and Finishing
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    • v.1 no.1
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    • pp.26-34
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    • 1989
  • The selective chemical degradation or etching of PET based on an organic amine attack on the ester group. The techniques involves the chemical removal of loss ordered amorphous regions or crystalline regions, which are essentially unaffected by the degradative etchant. Thus, most of previous studies have limited to consideration which has been given to structural changes taking place. Therefore, this study was carried out to investigate surface characterization, dyeing properties of PET film hydrazinolyzed with hydrazine hydrate in methanol. PET film was treated with 30% hydrazine hydrate in methanol at $30^\circ{C}$ for various time intervals. The total surface tension of treated PET increased, the dispersion force decreased and the hydrogen bonding force increased. The equilibrium dye adsorption, dyeing rate and apparent diffusion coefficient of acid dyes increased, and the apparent activation energies of diffusion decreased.

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2,3-Dichloro-5,6-Dicyano-1,4-Benzoquinone As a Redox Titrant

  • El-Brash, A.M.;El-Hussain, Laila A.
    • Archives of Pharmacal Research
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    • v.20 no.6
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    • pp.597-601
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    • 1997
  • An oxidimetric titrant, 2, 3-dichloro-5, 6-dicyano-1, 4-benzoquinone in anhydrous acetic acid is used for the semimicro-determination of hydrazine hydrate, phenylhydrazine hydrochloride, isoniazid and iproniazid phosphate in pure forms as well as in some pharmaceutical preparations containing isoniazid and iproniazid phosphate. The end point was detected potentiometrically using a platinum-calomel combination electrode. The results obtained are compared statistically with those obtained by the official methods and they are in good agreement.

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Reactions of trichloroethylideneacetophenone with hydrazines (I) synthesis of pyrazoline and pyridazinone derivatives (Trichloroethylideneacetophenone과 hydrazine들의 반응 (I) pyrazoline 및 pyridazinone 유도체의 합성)

  • Lee, Youn-Young;Lee, Woo-Young;Chang, Sae-Hee
    • Journal of the Korean Chemical Society
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    • v.14 no.1
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    • pp.61-64
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    • 1970
  • 3-Phenyl-5-trichloromethyl-2-pyrazoline was synthesized from the reaction of trichloroethylideneacetophenone with hydrazine hydrate. Pyridazinone derivatives were synthesized from the reaction of trichloroethylideneacetophenone with phenylhydrazine or substituted phenylhydrazines.

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Fine Structural Change of PET Film Treated with Hydrazine Hydrate in Methanol (Hydrazine/Methanol 처리에 의한 PET Film의 미세구조의 변화)

  • Sung, Woo-Kyung;Cho, Hyun-Hok;Kim, Kyung-Hwan
    • Textile Coloration and Finishing
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    • v.2 no.2
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    • pp.1-6
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    • 1990
  • In order to investigate the fine structural changes of poly (ethylene terephthalate) film by hydrazinolysis, PET was treated with hydrazine hydrate in methanol at $30^{\circ}C$ for various times. Initially apparent crystallite size and degree of orientation are increased and then, gradually decreased with hydrazinolysis. According to thermoluminescence measurement, trap site decreased by dissolution and then gradually increased with growth of defect in structure. Maximum peak temperature of tan and dynamic loss modulus E" upon hydrazinolysis shifted to the lower temperature in the progress of hydrazinolysis.ysis.

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Antimicrobial Assessment of Some Heterocyclic Compounds Utilizing Ethyl 1-Aminotetrazole-5-carboxylate (Ethyl 1-Aminotetrazole-5-carboxylate로부터 유도된 헤테로고리 화합물들의 항균 활성 시험)

  • Taha, Mamdouh A. M.;El-Badry, Susan M.
    • Journal of the Korean Chemical Society
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    • v.54 no.4
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    • pp.414-418
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    • 2010
  • Ethyl 1-aminotetrazole-5-carboxylate (1) reacted with hydrazine hydrate to give the corresponding aminohydrazide 2. Cyclization of 2 by carbon disulfide yielded 1,3,4-oxadiazole-5-thiol structure 3. Reaction of 3 with either chloroacetone or ethyl chloroacetate furnished S-acyl 1,3,4-oxadiazole derivatives 4 and 5, respectively. Also compound 3 reacted with hydrazine hydrate afforded 4-amino-1,2,4-triazole-5-thiol derivative 6. 6-Methyl-1,3,4-triazolo[3,4-b]-1,3,4-thiadiazole structure 7 was synthesized by reaction of aminothiol 6 with glacial acetic acid. Diazotization of 1 with sodium nitrite in presence of hydrochloric acid yielding the diazonium salt which on treating with hippuric acid, oxazolone derivative 8 was obtained. Furthermore, tetrazolo[5,1-f]-1,2,4-triazine 9 was constructed via cyclization of aminoester 1 with formamide. Compound 9 reacted with carbon disulfide to furnish 8-thione derivative 10 which reacting with chloroacetone, ethyl chloroacetate, and hydrazine hydrate, the corresponding chemical structures 11, 12, and 13 were synthesized. 1,2,4-Triazolo[4,3-d]tetrazolo[5,1-f]-1,2,4-triazines 14 and 15 were resulted by treating of compound 13 with triethyl orthoformate, and glacial acetic acid, respectively. The structures of the newly synthesized products were elucidated according to elemental analyses and spectroscopic evidences. Some of the representative members of the prepared compounds were screened for antimicrobial activity.

The Effects of Sonic Waves on the Reduction of Aromatic Nitro Groups Using Iron, Hydrazine Hydrate and Activated Carbon (유기 초음파화학. 초음파가 히드라진, 철, 활성탄을 이용한 방향족 니트로기의 환원반응에 미치는 영향)

  • Dae Hyun Shin;Byung Hee Han;Sung Yun Cho
    • Journal of the Korean Chemical Society
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    • v.30 no.1
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    • pp.105-108
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    • 1986
  • Ultrasound(50KHz) accelerated the reduction reaction of aromatic nitro group to aromatic amino group in high yield with mild condition using iron, hydrazine hydrate and activated carbon under room temperature and atmospheric pressure. The activated carbon has been used as a mixing material to highly active metals. However, aromatic nitro group does not reduce at all only with iron-hydrazine witliout adding activated carbon even under ultrasonic irradiation. We also discovered that the conversion yield from nitro group to amino group is directly proportional to the amount of activated carbon.

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Synthesis of Novel Pyrazolylquinoxalines (새로운 Pyrazolylquinoxaline류의 합성)

  • Kim, Ho Sik;Kwag, Sam Tag
    • Journal of the Korean Chemical Society
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    • v.44 no.3
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    • pp.229-236
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    • 2000
  • The reaction of 6-chloro-2-hydrazinoquinoxaline 4.oxide(10) with acetylacetone or dibenzoylmethane gave 6-chloro-2-(3,5-disubstituted pyrazol-1-yl)quinoxaline 4-oxides (11) through the intramolecular·cyclization.The chlorination of compound 11 with phosphoryl chloride afforded 3,6-dichloro-2-(3,5-disubstituted pyrazol-1-yl)quinoxalines (12), whose reaction with hydrazine hydrate provided 6-chloro-3-hydrazinodehydes, benzenesulfonyl chloride, substituted benzoyl chlohdes or acyl chlorides gave novel pyrazolylquinoxalines (14-17).

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Synthesis of Pyrimidines and Heteroannulated Pyrimidine Ring Systems (Pyrimidines과 pyrimidine의 헤테로고리의 합성)

  • Mohammed, F.K.;Badrey, M.G.
    • Journal of the Korean Chemical Society
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    • v.55 no.2
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    • pp.218-229
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    • 2011
  • We have involved the imine compound 1 in condensations with various nitrogenous reagents including hydrazine hydrate to construct differently substituted pyrimidines. One of the pyrimidines so obtained was further subjected to interactions with different reagents such as propionic acid, formic acid, ethyl chloroformate, acdetic anhydride, carbon disulphide, cyanogene bromide, triflauroacetic acid and ethyl chloroacetate which resulted in the formation of annulated heterocyclic systems as pairs of isomers in most cases as a result of Dimroth-type rearrangement.