化学工程
化學工程
화학공정
CHEMICAL ENGINEERING
2010年
3期
57-60
,共4页
环己酮-水-氟化钾%环己酮-水-碳酸钾%液液相平衡%Pitzer方程%NRTL方程%数学计算
環己酮-水-氟化鉀%環己酮-水-碳痠鉀%液液相平衡%Pitzer方程%NRTL方程%數學計算
배기동-수-불화갑%배기동-수-탄산갑%액액상평형%Pitzer방정%NRTL방정%수학계산
cyclohexanone-water-KF%cyclohexanone-water-K_2CO_3%liquid-liquid equilibrium%Pitzer equation%NRTL equation%mathematical calculation
采用气相色谱法测定了环己酮-水-氟化钾、环己酮-水-碳酸钾体系在25 ℃时的液液相平衡数据,相平衡数据表明产生的环己酮相中含有可以忽略的盐、水相中含有可以忽略的环己酮,因此采用氟化钾或碳酸钾可以有效地分离环己酮-水体系.分别采用Pitzer和NRTL方程计算水相和环己酮相中水的活度,将二者结合对液液相平衡进行了数学计算,计算值与实验值吻合较好,说明所选热力学模型对环己酮-水-氟化钾及环己酮-水-碳酸钾体系具有较好的计算精度,为采用氟化钾或碳酸钾分离环己酮-水体系提供了基础数据和设计依据.
採用氣相色譜法測定瞭環己酮-水-氟化鉀、環己酮-水-碳痠鉀體繫在25 ℃時的液液相平衡數據,相平衡數據錶明產生的環己酮相中含有可以忽略的鹽、水相中含有可以忽略的環己酮,因此採用氟化鉀或碳痠鉀可以有效地分離環己酮-水體繫.分彆採用Pitzer和NRTL方程計算水相和環己酮相中水的活度,將二者結閤對液液相平衡進行瞭數學計算,計算值與實驗值吻閤較好,說明所選熱力學模型對環己酮-水-氟化鉀及環己酮-水-碳痠鉀體繫具有較好的計算精度,為採用氟化鉀或碳痠鉀分離環己酮-水體繫提供瞭基礎數據和設計依據.
채용기상색보법측정료배기동-수-불화갑、배기동-수-탄산갑체계재25 ℃시적액액상평형수거,상평형수거표명산생적배기동상중함유가이홀략적염、수상중함유가이홀략적배기동,인차채용불화갑혹탄산갑가이유효지분리배기동-수체계.분별채용Pitzer화NRTL방정계산수상화배기동상중수적활도,장이자결합대액액상평형진행료수학계산,계산치여실험치문합교호,설명소선열역학모형대배기동-수-불화갑급배기동-수-탄산갑체계구유교호적계산정도,위채용불화갑혹탄산갑분리배기동-수체계제공료기출수거화설계의거.
The data for the liquid-liquid equilibrium (LLE) of cyclohexanone-water-KF and cyclohexanone-water-K_2CO_3 systems were measured at 25 ℃ by gas chromatography. It shows that the cyclohexanone phase contains negligible salt and the water phase contains negligible cyclohexanone. Thus water can be efficiently separated from the cyclohexanone-water system by adding KF or K_2CO_3 into the mixture. A mathematical calculation of LLE data was carried out by using the Pitzer equation and the non-random two liquids (NRTL) equation to get the water activities respectively in the water phase and in the cyclohexanone phase. The calculation results are proved to be in good agreement with the experimental ones, and shows that the thermodynamic model is of highly calculated accuracy for the systems of cyclohexanone-water-KF and cyclohexanone-water-K_2CO_3. The basic data and design basis for the process design of separating cyclohexanone-water system by using KF or K_2CO_3 are provided.
