【摘要】：針對N,N-二甲基乙酰胺(N,N-dimethylacetamide,即DMAC)水溶液中低濃度乙酸的分離問題,本文采用大孔弱堿性陰離子交換樹脂為吸附劑,在乙酸質量濃度為0.6%-6.0%的范圍內進行了吸附平衡、動力學和固定床動態(tài)吸附的研究。經過樹脂選型確定出D301G樹脂作為溶液中乙酸的吸附劑,通過靜態(tài)實驗,研究了溶液中DMAC的含量對吸附結果的影響,以及D301G樹脂對乙酸的吸附熱力學和動力學過程。結果表明,DMAC的存在,降低了樹脂的平衡吸附量,但D301G樹脂對于處理低濃度的乙酸仍具有良好的吸附與再生性能；D301G樹脂對乙酸的吸附符合Langmuir等溫吸附方程,在此基礎上,通過熱力學分析得到吸附熱力學參數(shù)△Gθ0, △Hθ0,△Sθ0說明該吸附過程為自發(fā)進行、放熱、熵減小的過程；吸附動力學結果符合準二級動力學模型,顆粒擴散是樹脂吸附乙酸速率的主要控制步驟。室溫(298K)條件下,在自制離子交換柱中,研究了進料流速、進口濃度及樹脂裝填量對樹脂動態(tài)吸附穿透曲線的影響。根據(jù)吸附平衡數(shù)據(jù)及吸附穿透曲線,計算得到動態(tài)吸附工程參數(shù)(傳質系數(shù)和傳質區(qū)高度),優(yōu)化吸附工藝條件。研究發(fā)現(xiàn),隨著進料流速的增加,傳質系數(shù)和傳質區(qū)高度增大,傳質阻力減小,但吸附穿透點的時間提前,綜合考慮選擇進料流速4 mL/min較為適宜;乙酸初始濃度和樹脂裝填量,應根據(jù)實際實驗裝置大小和操作要求而定。在上述實驗的基礎上,建立數(shù)學模型,對樹脂固定床動態(tài)吸附乙酸的穿透曲線進行模擬。結果表明該數(shù)學模型計算得到的吸附穿透曲線和實驗得到的穿透曲線基本吻合,而且該模型的建立也為估算穿透點的時間提供了一條方便可靠的方法。
[Abstract]:To solve the problem of separation of low concentration acetic acid from aqueous solution of NN- dimethylacetamide (DMAC), macroporous weakly basic anion exchange resin was used as adsorbent. In the range of 0.6 ~ 6.0% acetic acid concentration, the adsorption equilibrium, kinetics and dynamic adsorption of fixed bed were studied. D301G resin was selected as the adsorbent of acetic acid in solution. The influence of DMAC content in solution on the adsorption results and the thermodynamic and kinetic process of adsorption of acetic acid by D301G resin were studied by static experiments. The results showed that the existence of DMAC reduced the equilibrium adsorption capacity of the resin, but D301G resin still had good adsorption and regeneration properties for the treatment of low concentration acetic acid. The adsorption of acetic acid by D301G resin accords with Langmuir isothermal adsorption equation. On this basis, the adsorption thermodynamic parameters G 胃 0, H 胃 0 and S 胃 0 show that the adsorption process is spontaneous, exothermic and entropy decreasing. The results of adsorption kinetics are in accordance with the quasi-second-order kinetic model. Particle diffusion is the main control step of the adsorption rate of acetic acid by resin. At room temperature (298K), the effects of feed flow rate, inlet concentration and resin filling amount on the dynamic adsorption penetration curves of resin were studied in a self-made ion exchange column. According to the adsorption equilibrium data and the adsorption penetration curve, the dynamic adsorption engineering parameters (mass transfer coefficient and mass transfer region height) were calculated and the adsorption process conditions were optimized. It is found that the mass transfer coefficient and the height of mass transfer zone increase with the increase of feed flow rate, and the mass transfer resistance decreases, but the time of adsorption penetration point is advanced, so it is more appropriate to choose the feed flow rate for 4 mL/min. The initial concentration of acetic acid and the filling amount of resin should be determined according to the size and operation requirements of the actual experimental device. On the basis of the above experiments, a mathematical model was established to simulate the breakthrough curve of dynamic adsorption of acetic acid on the resin fixed bed. The results show that the adsorption penetration curve calculated by the mathematical model is in good agreement with the experimental penetration curve, and the establishment of the model provides a convenient and reliable method for estimating the time of penetration point.
【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：O647.3;TQ225.122

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