Solvent Crystallization Separation Of Basic Research Of Coal Tar, Anthracene And Carbazole

Anthracene and carbazole are important organic intermediates, which can be derived from coal tar. The isolation of Anthracene and Carbazole is rather difficult and the crystallization and extraction processes are frequently applied in purification of anthracene and carbazole. Therefore the study of (solid + liquid) equilibria is an important tool in analyzing such engineering processes.In this work, the solubility of anthracene and carbazole in DMF, DMA and NMP were determined which was the base for the isolation of anthracene and carbazole. The results show the solubility of anthracene and carbazole increased with the temperature increasing and the order of the solubility of anthracene and carbazole in these three solvents is NMP〉DMA〉DMF; at a certain temperature the solubility of carbazole was lager than that of Anthracene.Based on the equilibrium data, the model parameters of UNIQUAC, Wilson and NRTL have been correlated. The solubility of anthracene and carbazole were calculated using these models. Results show that UNIQUAC, Wilson and NRTL can be used to predict solubilities successfully.The phase equilibrium of anthracene-carbazole-DMA and anthracene-carbazole- DMF at a certain temperature has been measured by means of the Schreinemaker's wet residues method, and the phase diagram are constructed. The SLE phase diagram illustrate that the two crystallization regions corresponding to anthracene and carbazole increased as the themperature decreasing, and the solubility of anthracene are reduced little as the mole fraction of carbazole increase while the solubility of carbazole reduced when the content of anthracene increased.The interaction parameters between anthracene and carbazole in these models were...