Dissertation > Excellent graduate degree dissertation topics show

The Study of the Adsorption Properties for Metal Ions and the Triphase-tansfer Catalysis Properties of the Immobilized Crown Ethers Dibenzo-18-crown-6

Author: WangShiWei
Tutor: GaoBaoJiao
School: University of North
Course: Polymer Chemistry and Physics
Keywords: Dibenzo-18 - crown - 6 Crosslinked polyvinylalcohol microspheres Immobilization Complex adsorption Metal ion Three-phase phase-transfer catalysis
CLC: O643.32
Type: Master's thesis
Year: 2010
Downloads: 85
Quote: 0
Read: Download Dissertation

Abstract


Certain chemically modified crown ether immobilized on a polymer microspheres, is an important direction for the development of crown ether chemistry. Identification of metal ion complexation and phase transfer catalysis Immobilization of crown ethers two important applications. The success of this project dibenzo-18 - crown -6 (DBC), chemically modified, based on the cross-linked polyvinyl alcohol (CPVA) microspheres prepared Immobilization crown ether and a more in-depth study of the immobilized crown ether metal ion binding properties of phase-transfer catalysis in the synthesis of butyl benzoate, has made a valuable research results. This article first homemade chloromethylated reagent 1,4 - dichloro-methoxy-butane (BCMB), in the presence of a Lewis acid catalyst, the crown ether dibenzo-18 - crown -6 (DBC) chloroformate -reaction chloromethylation crown ethers (CMDBC),; use of FTIR, 1H-NMR, 13C-NMR and MS its structure characterized by a variety of means of spectroscopic; experimental results show that DBC chloromethyl The reaction easily performed on the two benzene rings, respectively, the symmetry of the chloromethylation reaction, is symmetrical in CMDBC tetra-substituted product. Directly crosslinked into a ball reaction using glutaraldehyde as the crosslinking agent, in the inverse suspension system, and a crosslinked polyvinyl alcohol (CPVA) microspheres were prepared; using CPVA microsphere surface hydroxyl CMDBC chloroformate The base between nucleophilic substitution reaction, in order to achieve the crown ether Immobilization prepared the the functional microspheres DBC-CPVA solid containing crown ether. On the basis of the establishment of the crown ether DBC solid load determination method - \The results show that the nature of the solvent and reaction temperature have a greater impact on the DBC in CPVA microspheres Immobilization reaction the polar DMF as a suitable solvent, 70 ° C is a suitable temperature, may be prepared under suitable conditions. was the Crown ethers DBC solid loading of 1.72 mmol / g of the DBC-CPVA microspheres. This paper systematically studied the Immobilization of crown ether and the effects of temperature on the the complexation adsorption behavior of different metal ions, Immobilization of crown ethers adsorption performance. The results show that for a monovalent alkali metal ion, DBC-CPVA microspheres K ion complexation adsorption capacity is much larger than the the complexation adsorption capacity of the other ions, the adsorption capacity of order of K gt; gt; Na gt; Li gt; Rb gt; Cs ; For two divalent metal ions, DBC-CPVA microspheres the Zn 2 Co 2 ions exhibit the strong complexation adsorption capacity, the adsorption capacity of 0.73 mmol / g at room temperature and adsorbed Zn 2 Co. 2 ion Immobilized DBC molar ratio of about 1:2, may form a sandwich complex; DBC- of CPVA microspheres of the order of the divalent metal ion complexation adsorption capacity for Zn 2 gt; Co 2 gt; gt; Cu 2 gt; Cd 2 gt; Mg 2 ; decreases with increasing temperature, DBC-CPVA microspheres reduced the adsorption capacity of the metal ions. Immobilization of DBC-CPVA crown ether Phase Transfer Catalysis esterification of benzoic acid and n-butane as a model reaction system, examines the main factors of liquid - solid - liquid phase transfer catalysis reaction the impact. The results show that after the benzoic acid with potassium hydroxide in the aqueous phase to generate potassium benzoate DBC-CPVA, immobilized on the surface of the DBC with K ion forming a complex cation which can effectively The benzoate anion transferred to the organic phase, so that smooth and bromobutane esterification reaction. The stronger the polarity of the organic phase, the faster the rate of the esterification reaction, the higher the rate of n-butane conversion; organic phase to aqueous phase ratio of 1:4 (V / V), the esterification reaction with the fastest the rate bromobutane conversion rate of up to 70%. Solid catalyst DBC-CPVA 8 cycles, the catalytic activity remained stable.

Related Dissertations

  1. Penicillium Expansum TS414 Lipase in Pichia Pastori: Expression, Purification and Enantioselective Esterification of (R, S)-naproxen,Q814
  2. Thermal Stability of Complexes of Chitosan Quaternary Ammonium Salt and Metal Ion,O634
  3. The Research on Immobilization of β-galactosidase and Production Technology of Low Lactose Milk,TS252.4
  4. Effects of Low Molecular Organic Acids on Immobilazition of Lead Ions by Nanosized Hydroxyapatite,S153
  5. Study on Synthesis of Polysaccharide Tris (Phenylcarbamates) Derivatives as Chiral Stationary Phases (CSPs) and Estimation of Their Resolution Abilities,TQ460.1
  6. Extraction of the Lipase from Pseudomonas Cepacia S31 and Its Applications in Food,TS201.25
  7. The Research on the Microwave Stability of Selenium-Enriched Rich Bram,TS210.9
  8. Transfer and Transformation of Cu in Black Soil-Crop System and In-sit Immobilization Mechanism,X53
  9. Research on Detection of the Carbamate Pesticides by Aminoacids-matal Ions Films Chemically Modified Sencor,S481.8
  10. Immobilization test strain qy37 processing the high salt nitrogenous wastewater research,X703
  11. Ag / CTS imprinted gel Preparation and properties of the ball,TQ424
  12. APTES and protein A -based joint immobilization technology hepatitis B virus immunization sensitive film for biosensor research,TP212.3
  13. Sugar polymer nanofiber membrane preparation and its application in enzyme immobilization,TB383.2
  14. Manganese Removal Using Several Managanse-resistant Bacteria,X172
  15. Improving Bioleaching Rate Using Immobilized Cell Reactor,TF18
  16. Study on Sythesis and Adsorption Performance of Chitosan Resin with Template of Ni-Ion,TF815
  17. The Fluorescent Receptor Molecule Design and Investigation of Sensor Capability Based on Calix[6]arene,O621.25
  18. Research of Aqueous Ion-exchange Technology to Optimize X-type Zeolites’ CO2 Capture Capacity,TQ028.1
  19. Synthesis, Structures and Properties of Rare Earth Metal Multinuclear Complexes Bridged by Pyridine-2,3,5,6-tetracarboxylic Acid,O627.3
  20. Microbial Transformation of β-Aminopropionitrile to β-Alanine,TQ226
  21. An Investigation on Photocatalytic Activity of Halogen Element-doped Nano-TiO2,O614.411

CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
© 2012 www.DissertationTopic.Net  Mobile