Dissertation > Excellent graduate degree dissertation topics show

Study on Microwave Assisted Heterogeneous Catalytic Synthesis Technology of Lactide

Author: LiZuo
Tutor: WangPeng
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: montmorillonite solid acid catalyst lactide microwave irradiation
CLC: TQ225.24
Type: Master's thesis
Year: 2011
Downloads: 45
Quote: 0
Read: Download Dissertation

Abstract


As the exhaustion of oil resources, and the environmental problems caused by petroleum based plastics, searching for substitute of petroleum resources is the current hot research in the field of plastic production. PLA is a kind of bio-surfactant fully-degradable plastic, which has rich resources of raw materials and green degradation process, the use of PLA is beneficial to achieve the virtuous cycle of environment system, and it is an effective way to alleviate the oil crisis and eliminate the "white pollution".To realize the large-scale production and application of PLA, we investigated the microwave-assisted modification of MMT and synthesis of lactide, in order to develop a environment-friendly synthesis technologyof lactide with high productivity and low energy consumption.Acid MMT （H-MMT） was prepared by activating Na-MMT with acid under microwave irradiation, and then the technological conditions of preparing H-MMT was investigated systematically. The structure and characters of H-MMT were studied by the use of XRD、BET、TG、NH3-TPD, The results revealed that acid activation did not affect the layer structure, the surface area and pore volume was larger, and the acid amount was increased. Thus, the acidity and catalytic activity （tested in terms of ester yield of n-butyl lactate） were significantly improved.By using H-MMT as catalyst supporters, environmentally friendly SnO/HMMT solid catalyst was prepared through impregnation-evaporation method. The structure and characters of SnO/HMMT were studied by the use of XRD、XPS、TG、NH3-TPD, the results revealed that there is a chemical reaction between MMT supporter and SnCl2, the existing form of Sn was SnO, the mechanical and thermal properties of catalyst were very stable within 200℃. meanwhile, the racid center and acid amount was significantly improved. SnO/HMMT has both the active centers of catalyzing polycondensation and depolymerization, thus, it exhibits highly catalytic activity in synthesis of lactide.Using SnO/HMMT as catalyst,microwave irradiation as heating method,the technological conditions of was systematically investigated. And then, methods of product purification were discussed. The results showed that the crude productivity was 90%,the pure productivity was 42.9%. Microwave assisted heterogeneous catalytic synthesis of lactide was a environment-friendly technology with high productivity and low energy consumption.

Related Dissertations

  1. Adsorption Effects of Phosphate and Chromium from Aqueous Solution by Adsorption Using LDH and Mg/Fe/Al Modified Montmorillonites,X703
  2. Preparation and Performance Study of the Full-degradable Polythene Films,TQ320.721
  3. α- aminoalkyl phosphonates Green Synthesis of,O627.51
  4. Poly(L-lactide) Nanocomposites Containing Octaglycidylether Polyhedral Oligomeric Silsesquioxane: Prepartion, Structure and Properties,R318.08
  5. Synthesis, Characterization and Catalytic Activity of Bridged Phenolate (Alkoxylate) Lanthanide Complexes,O627.3
  6. ATO zeolite microwave synthesis and hydroisomerization of n-decane Performance,TQ424.25
  7. Nano- reinforced PVC gloves Preparation and Characterization,TB383.1
  8. Efficacy of Ciprofloxacin -poly(D, L-lactide-co-glycolide) Microspheres for the Adjuvant Treatment of the Sd Rats Gustilo II Type Open Femur Fracture,R687.3
  9. The Preparation and Characterization of Micro/Nanoscale Bio-Composite Fibers by Electrospinning,TB332
  10. Tungsten Hexachloride and Its Oxide Aryl Phosphine Ligand Catalyzed DCPD Polymerization Activity and PDCPD/ MMT Nano-composites Research,O631.3
  11. Synthesis and Characterization of Hexabromocyclotriphosphazene,O634.51
  12. The Activation Study of Unburned Coal Gangue by Microwave Radiation in Yunnan,TU528.041
  13. Preparation and Characterization of Nanoparticles Based on Amphiphilic Star-branched SPLA-b-PDMAEMA Copolymers,TB383.1
  14. Study on Preparation, Structure and Properties of EVOH/Montmorillonite Nanocomposites,TB383.1
  15. Synthesis and Application of Titanium Silicate-1 Films,O614.411
  16. Experimental Studies on a New Tissue Engineering Bone Lodaded with Bone Morphogenetic Protein and Vascular Endothelial Growth Factor,R318.08
  17. Research on the Modifcation of Chitosca,R318.08
  18. Application of Caster Oil on the Modification of Polylactide,TQ320.1
  19. Study on the Synthesis of Polylactic Acid and Simulation of the Synthesis Process of Lactide,TQ320.1
  20. Synthesis and Characterization of Anionic Rare-earth Metal Amides Stabilized by Phenoxy-amido Ligands and Their Catalytic Behavior for the Polymerization of L-lactide,O621.13
  21. Preparation of Photocatalyst of Nanometer Tio2/montomorillonite and Its Catalytic Properties of Azo Compounds,O643.36

CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aliphatic compounds ( acyclic compounds) > Aliphatic carboxylic acid and its derivatives > Carboxylic acid derivatives of the function > Ester
© 2012 www.DissertationTopic.Net  Mobile