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azeotropic mixture used for development and validation of Lornoxicam in bulk and its tablet dosage form by spectrophotometric method

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Journal of Pharmaceutical Analysis 2012年第4期2卷 306-309页

作者： Prajesh Prajapati Vipul Vaghela Deepak Rawtani Harshad Patel Jasmin Kubavat Dharmendra Baraiya Department of Pharmaceutical Analysis Institute of Research and DevelopmentGujarat Forensic Sciences UniversitySector-18ANr.Police bhavan A.R.College of Pharmacy and G.H.Patel Institute of Pharmacy

A novel,safe,economic and sensitive method of spectrophotometric estimation has been developed using Azeoptropic mixture (water∶methanol:60∶40,v/v) for the quantitative determination of Lornoxicam,a practically water-insoluble ***,Lornoxicam stock solution was prepared in Azeoptropic *** showed maximum absorbance at 383 ***'s law was obeyed in the concentration range 4-24 μg/mL with regression coefficient of *** method was validated in terms of linearity (R2=0.999),precision (CV for intra-day and inter-day was 0.28 0.68 and 0.12-0.92,respectively),accuracy (98.03-100.59％ w/w) and *** method is simple,precise,accurate,sensitive and reproducible and can be used for the routine quality control testing of the marketed formulations.

关键词： Analgesic Chlortenoxicam Lornoxicam Oxicam Spectrophotometric azeotropic mixture

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Measurements of the Heat Capacity of an azeotropic mixture of Water and n-Butanol from 78 to 320 K

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Chinese Journal of Chemistry 2005年第10期23卷 1297-1302页

作者：南照东谭志诚邢军 Department of Chemistry Qufu Normal University Qufu Shandong 273165 China Thermochemistry Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China

Molar heat capacities of n-butanol and the azeotropic mixture in the binary system [water （x=0.716） plus n-butanol （x=0.284）] were measured with an adiabatic calorimeter in a temperature range from 78 to 320 K. The functions of the heat capacity with respect to thermodynamic temperature were estabhshed for the azeotropic mixture. A glass transition was observed at （111.9±1.2） K. The phase transitions took place at （179.26±0.77） and （269.69±0.14） K corresponding to the solid-hquid phase transitions of n-butanol and water, respectively. The phase-transition enthalpy and entropy of water were calculated. A thermodynamic function of excess molar heat capacity with respect to temperature was estabhshed, which took account of physical mixing, destructions of self-association and cross-association for n-butanol and water, respectively. The thermodynamic functions and the excess thermodynamic ones of the binary systems relative to 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity and the calculated excess heat capacity with respect to temperature.

关键词： adiabatic calorimetry heat capacity excess heat capacity azeotropic mixture water n-butanol

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Thermodynamic Properties of the azeotropic mixture of Acetone, Cyclohexane and Methanol

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Chinese Journal of Chemistry 2006年第10期24卷 1301-1304页

作者：王秀荣南照东谭志诚 Library of Qufu Normal University Qufu Shandong 273165 China Department of Chemistry Qufu Normal University Qufu Shandong 273165 China Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China

Molar heat capacities of the pure samples of acetone, methanol and the azeotropic mixture composed of acetone cyclohexane and methanol were measured by an adiabatic calorimeter from 78 to 320 K. The solid-solid and solid-liquid phase transitions of the pure samples and the mixture were determined based on the curve of the heat capacity with respect to temperature. The phase transitions took place at （126.16±0.68） and （178.96±1.47） K for the sample of acetone, （157.79±0.95） and （175.93±0.95） K for methanol, which were corresponding to the solid-solid and the solid-liquid phase transitions of the acetone and the methanol, respectively. And the phase transitions occurred in the temperature ranges of 120 to 190 K and 278 to 280 K corresponding to the solid-solid and the solid-liquid phase transitions of mixture of acetone, cyclohexane and methanol, respectively. The thermodynamic functions and the excess thermodynamic functions of the mixture relative to standard temperature of 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity with respect to temperature.

关键词： azeotropic mixture acetone cyclohexane methanol heat capacity

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Thermodynamic Investigation of the azeotropic mixture Composed of Water and Benzene

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Chinese Journal of Chemistry 2004年第1期22卷 4-8页

作者：南照东谭志诚 Department of Chemistry Liaoning Normal University Thermochemistry Laboratory Dalian Institute of Chemical PhysicsChinese Academy of Sciences

The molar heat capacity of the azeotropic mixture composed of water and benzene was measured by an adia-batic calorimeter in the temperature range from 80 to 320 K. The phase transitions took place in the temperature range from 265.409 to 275.165 K and 275.165 to 279.399 K. The phase transition temperatures were determined to be 272.945 and 278.339 K, which were corresponding to the solid-liquid phase transitions of water and benzene, respectively. The thermodynamic functions and the excess thermodynamic functions of the mixture relative to stan-dard temperature 298.15 K were derived from the relationships of the thermodynamic functions and the function of the measured heat capacity with respect to temperature.

关键词： azeotropic mixture water benzene heat capacity adiabatic calorimetry

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Thermodynamic Study on the azeotropic mixture Composed of Ethanol and Toluene

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Chinese Journal of Chemistry 2005年第7期23卷 823-828页

作者：南照东谭志诚邢军 DepartmentofChemistry QufuNormalUniversityQufuShandong273165China//ThermochemistryLaboratoryDalianInstituteofChemicalPhysicsChineseAcademyofSciencesDalianLiaoning116023China DepartmentofChemistry QufuNormalUniversityQufuShandong273165China ThermochemistryLaboratory DalianInstituteofChemicalPhysicsChineseAcademyofSciencesDalianLiaoning116023China

The molar heat capacity of the azeotropic mixture composed of ethanol and toluene was measured by a high precision adiabatic calorimeter from 80 to 320 K. The glass transition and phase transitions of the azeotropic mixture were determined based on the heat capacity measurements. A glass transition at 103.350 K was found. A solid‐solid phase transition at 127.282 K, two solid‐liquid phase transitions at 153.612 and 160.584 K were observed, which correspond to the transition of metastable crystal to stable crystal of ethanol and the melting of ethanol and toluene, respectively. The thermodynamic functions and the excess ones of the mixture relative to the standard temperature 298.15 K were derived based on the relationships of the thermodynamic functions and the function of the measured heat capacity with respect to temperature.

关键词： azeotropic mixture ethanol toluene heat capacity excess thermodynamic function adiabatic calorimetry

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Simulation for Transesterification of Methyl Acetate and n-Butanol in a Reactive and Extractive Distillation Column Using Ionic Liquids as Entrainer and Catalyst

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Chinese Journal of Chemical Engineering 2011年第5期19卷 754-762页

作者：蔡贾林崔现宝杨志才 State Key Laboratory of Chemical Engineering (Tianjin University) School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

A new reactive and extractive distillation process with ionic liquids as entrainer and catalyst （RED-IL）was proposed to produce methanol and n-butyl acetate by transesterification reaction of methyl acetate with n-butanol. The RED-IL process was simulated via a rigorous model, and high purity products of methanol and n-butyl acetate can be obtained in such a process. The effects of reflux ratio, feed mode, holdup, feed location, entrainer ratio and catalyst concentration on RED-IL process were investigated. The conversion of methyl acetate and purities of products increase with the holdup in column, entrainer ratio and catalyst content. An optimal reflux ratio exists in RED-IL process. Comparing to the mixed-feed mode, the segregated-feed mode is more effective, in which the optimal feed locations of reactants exist.

关键词： ionic liquid reactive and extractive distillation transesterification reaction azeotropic mixture

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