Several 1-(substituted phenoxy)-3-{[4-(4-trifluoromethyl) phenoxy] piperidin-1-yl} propan-2-ols (str.II) were prepared in a six-step reaction sequence starting from methylamine and ethyl acrylate and evaluated for antidepressant activity.
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Substituents at the 4th and 5th positions of the target thiazoles were introduced by a Hantzsch reaction, and the chain at the second position was extended through a Sandmeyer reaction, formylation, and Wittig olefination.
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A series of ortho- meta- and para-N9-[(chloromethylphenyl)methyl]chloropurines 4-12 and N7-[(chloromethylphenyl)methyl]chloropurines 13-21 were obtained by the reaction of various substituted chloropurines with α,α'-dichloroxylenes.
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A series of 1-[(sub)]-6-fluoro-3- [(sub)]-1, 3, 4-oxadiazol-2-yl-7-piperazino-1, 4-dihydro 4-quinolinones were synthesized by the reaction between ciprofloxacin and norfloxacin with an appropriate acid hydrazide in phosphorous oxychloride.
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The pyrazolo[4,3-d]oxazinone 4 was obtained from direct reaction of the acid 1 with hydroxylamine hydrochloride.
The following vector equations express the steady-state heat balance, material balance and rate of chemical reaction in a fixed bed reactor: div(C_pρT)=div(K grad T)+γ△H div(C)=div(E_1 gard C)+γ γ=bf(C)e~(-E/RT). A direct-current electric analog method is developed for the design of fixed bed catalytic reactors.. The following circumstances have been used-to test the present method: (1) Neglect the effect of mass transfer and assume γ△H=constant; (2) Neglect the effect of mass transfer and assume γ△H=...
在穩定狀態下,固定床接觸反應器內的傳熱、傳質和化學反應的過程可用下列微分方程式來表示: div(C_pρT)=div(K grad T)+γΔH div(C)=div(E_ grad C)+γγ=bf(C)e~(-E/(RT))。作者應用直流電模擬法解以下四種情况: (ⅰ)不考慮傳質,並假設γΔH=q_0,即反應速率與溫度和作用物濃度無關; (ⅱ)不考慮傳質,假設γΔH=q_0+α_0T; (ⅲ)不考慮傳質,假設γΔH=Ae~(-E/(RT)); (ⅳ)考慮傳質和溫度及濃度對反應速率的影響;並採用了Wilhelm的傳質數據(Et),作者,Argo和Smith的傳熱數據(Ke),Smith的SO_2氧化成SO_3的動力學數據。由(ⅰ)、(ⅱ)求得的溫度分佈和文獻上發表的理論解進行了比較,由(ⅳ)求得的溫度分佈和濃度分佈與Smith等實驗測定的數據進行了比較,結果基本上是一致的。
In order to investigate the effect of operating variabls on the yield of aromatics,a certain fraction of a straight run gasoline containing 48.4% (wt.)naphthenes was catalytically converted into aromatics over a bed of 100 ml 14—20 mesh,granular,platforming catalyst under various opera- ting conditions.The ranges of these investigations were:temperature 430— 510℃,pressure 20—50 atm.,WHSV 1.58—6.32 and hydrogen-oil molar ratio 4:1—10:1.The single pass fresh hydrogen process was adopted. The result of data tr...
The possibility of using granular nitrided fused iron catalyst for Fischer-Tropsch synthesis at high space velocities is investigated. It is observed that the activity of granular catalyst decreases seriously with time when used at low reaction temperatures,while the use of relatively high reaction temperatures stimulates carbon formation on the catalyst,resulting in the clogging up of the reactor.These phenomena differ from what occurs on a powdered catalyst. The effect of the operating variabl...
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