本文選題：PET + 醇解　； 參考：《華東理工大學(xué)》2017年碩士論文

【摘要】：聚酯(PET)產(chǎn)量很大且在環(huán)境中很難被微生物降解,對PET的回收再利用不僅可以緩解環(huán)境壓力,減少環(huán)境污染,而且還可以變廢為寶減少資源浪費,所以在PET的循環(huán)再利用中找出一種新型高效的催化劑仍是目前研究的重點。本文將沸石咪唑酯骨架結(jié)構(gòu)材料(ZIFs)作為催化劑應(yīng)用于PET的催化醇解過程中,并取得了良好的效果。通過FTIR,XRD,TGA,BET以及NH3-TPD等一系列表征方法對制備出的三種ZIFs材料(ZIF-7,ZIF-8與ZIF-67)的結(jié)構(gòu)以及表面性質(zhì)進行分析表征,并將其應(yīng)用于PET的催化醇解反應(yīng)中,通過分析比較確定三種ZIFs材料的最佳原料配比。當(dāng)ZIF-7,ZIF-8和ZIF-67的原料摩爾比分別為3:1,4:1和4:1時,PET的降解效率最高。除此之外,本文還在ZIFs材料的催化作用下,探討聚酯PET醇解的工藝流程,研究催化劑用量、溶劑用量、反應(yīng)溫度以及反應(yīng)時間四個反應(yīng)因素對于原料PET轉(zhuǎn)化率以及目標產(chǎn)物收率的影響,并確定最佳反應(yīng)條件。反應(yīng)結(jié)束后,本文對殘留溶劑乙二醇(EG)與催化劑進行分離回收重復(fù)再利用并就其循環(huán)使用次數(shù)進行分析研究。結(jié)果表明,在PET的醇解過程中本文所制備的三種ZIFs材料均可以重復(fù)使用至少3次且催化活性沒有明顯的減弱,而重復(fù)回收的溶劑EG也仍然保持原有溶劑的性質(zhì)。對PET醇解反應(yīng)得到的主產(chǎn)物與副產(chǎn)物分別進行定性和定量分析,確定醇解主產(chǎn)物為單體BHET,而醇解的主要副產(chǎn)物是單體BHET的二聚體。除此之外,本文還對PET醇解反應(yīng)動力學(xué)進行分析研究,確定在ZIFs材料的催化作用下,PET醇解的反應(yīng)動力學(xué)級數(shù)為一級,且通過分析計算確定在ZIF-7,ZIF-8和ZIF-67的催化作用下,PET醇解的反應(yīng)活化能 Ea 分別為 231.04 kJ/mol,137.64 kJ/mol 和 191.63 kJ/mol。
[Abstract]:The recycling and reuse of PET can not only relieve the environmental pressure and reduce environmental pollution, but also reduce the waste of resources. Therefore, it is still the focus of current research to find a new type of high-efficient catalyst in the recycling and reuse of PET. In this paper, zeolites imidazolyl ester framework material (ZIFs) was used as catalyst for the alcoholysis of PET, and good results were obtained. The structure and surface properties of three kinds of ZIFs materials, ZIF-7, ZIF-8 and ZIF-67, were characterized by FTIR and NH3-TPD, and applied to the catalytic alcoholysis of PET. Through analysis and comparison, the optimum raw material ratio of three kinds of ZIFs materials was determined. When the molar ratio of ZIF-7, ZIF-8 and ZIF-67 is 3: 1, 4: 1 and 4:1, respectively, the degradation efficiency of ZIF-7, ZIF-8 and ZIF-67 is the highest. In addition, under the catalysis of ZIFs, the technological process of the alcoholysis of polyester PET, the amount of catalyst, the amount of solvent, The effects of reaction temperature and reaction time on the conversion of PET and the yield of the target product were investigated and the optimum reaction conditions were determined. After the reaction, the residual solvent ethylene glycol (EGG) and the catalyst were separated and reused and their recycling times were analyzed. The results show that the three kinds of ZIFs materials prepared in this paper can be reused for at least three times during the alcoholysis of PET, and their catalytic activity is not obviously weakened, while the reclaimed solvent EG still retains the original solvent properties. The main product and by-product obtained from PET alcoholysis were qualitatively and quantitatively analyzed. It was determined that the main product of alcoholysis was monomer BHET.The main by-product of alcoholysis was dimer of monomer BHET. In addition, the kinetics of alcoholysis of PET was analyzed and studied. The order of kinetics of alcoholysis of PET was determined as the first order under the catalysis of ZIFs. The activation energy (EA) of the alcoholysis of ZIF-67 was determined to be 231.04 KJ / mol ~ (137.64) kJ/mol and 191.63 KJ / mol ~ (-1), respectively, under the catalysis of ZIF-7, ZIF-8 and ZIF-67.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ316.2

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