| Anthracene,phenanthrene and carbazole is the main component of coal tar and the important raw material of fine chemical. During the process of the separation and extraction of anthracene,phenanthrene and carbazole from coal tar by solvent extraction, the optimization of process conditions and the rational choice of solvents are closely related to the solubility of anthracene,phenanthrene and carbazole in solvents. It is very important to measure the solubility of anthracene,phenanthrene and carbazole in different solvents for improving the extraction process.The solubility of anthracene, phenanthrene and carbazole in N , N-dimethyformamide (DMF), N,N-dimethylacetamide(DMA) and N–methyl- 2-pyrrolidone (NMP) was determined in the temperature range from 20 to 95℃using a liquid-solid phase equilibrium method. The solubility behavior of anthracene ,phenanthrene and carbazole in DMF,DMA and NMP was also obtained using the UNIFAC group contribution method and the model equations were solved by MATLAB. The comparative average error between the calculated results and experimental data of anthracene is 43.23%,36.38% and 27.49% in DMF,DMA and NMP respectively, which is 6.80%,5.07% and 0.97% for phenanthrene. The UNIFAC model can be applied to predict the solubility of anthracene in DMF,DMA and NMP. The work provides a elementary basis for selecting a solvent and optimizing process during the separation and purification of crude anthracene process by solvent methods.Through the experiment, it is known that the dissolving effect of benzene to Phenanthrene in some studied organic solvent is best, moreover DMF to carbazole is best. So benzene and DMF from the some solvents can be used to separate crude anthracene. At 80℃,crystal-keeping time 60min, the solvent ratio 1.8g / m1, the effect of DMF is the best to separate carbazole from the compound of anthracene and carbazole.
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