Research On Novol Adsorbents For Phenol Separation From Oils

The coal tar oil produced in the process of coal chemical industry contains a large amount of phenolic compounds, wt 75% of which are lower phenols such as phenol, cresol and xylenol etc. Phenolic compounds can be widely used in chemical intermediates, pesticides, synthesis fiber, engineering plastics, medicines, etc. At the same time the existence of phenolic compounds may decrease the quality of the coal tar oil. Therefore it is significant to recover phenolic compound from coal tar oil.The conventional method to separate phenol compounds from oil mixture is chemical extraction by using aqueous alkaline solution such as NaOH and then acidification the extract by adding acid like H2SO4 to recover phenol. The disadvantage of this process is production of excessive amounts of waste water containing phenol since a large amount of strong alkalis and acids are used. Apparently an environment-friendly way to remove phenol from oil mixtures using non-aqueous method would be highly favored. In this study, all the research was based on acid-base complexation function, investigated the adsorption ability of phenol on urotropin, triazole, AlC13, FeCl3 and poly ionic sorbents (PIS) materials.According to the specific acid-base properties (Bronsted acid and lewis base) of phenol, using Lewis base-HMT, triazole and Lewis acid such as AlCl3 and FeCl3 to separate phenol from model oil. The four materials exhibit excellent phenol adsorption performance. The molar adsorption capacity order is:AICl3> HMT> triazole, of which AICl3 has the largest molar adsorption capacity. However, it is difficult to recover phenol from AlCl3-phenol complex because of its strong interaction between the molecules. HMT is the best adsorbent for phenol from model oil, the saturated adsorption capacity can be 3.5 g·g-1, which is 15 times more than the current adsorbent materials. Further, we studied the adsorption selectivity of phenol from model oil, the existence of BT and naphthalene aromatic substances can improve the rate of adsoiption reaction. The existence of quinoline greatly interferes the adsorption ability of phenol, the saturated adsorption capacity declines to 1.0 g · g-1. HMT can be recovered from the complex by diethyl ether to recycle and reused.A facile, template-free synthetic route was reported toward poly (ionic liquid)-poly (vinyl benzyl urotropin) chloride, i.e. P[VBnU]Cl. The as-prepared P[VBnU]Cl was analyzed and characterized with respect to composition, structure, morphology and thermal stability. The results indicate that the P[VBnU]Cl is fluffy powder and contains plentiful porosity. The P[VBnU]Cl exhibits good thermal stability with its initial decomposition temperature being about 220 ℃. The P[VBnU]Cl can be used as an excellent adsorbent for phenol, the adsorption capacity for phenol reaches 737 mg· g-1. The used P[VBnU]Cl adsorbent can be generated easily with diethyl ether, and used repeatedly with good adsorptivity.[PSU]Cl was prepared by linear polystyrene material and urotropin to remove phenol from model oil. The characterization results showed that the material is solid powder with a large amount of porous structure with the specific area of 200 mg· g-1. The saturated adsorption capacity of phenol is 430 mg·g-1, at the same time the regenerative adsorption performance is good.