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Related Experiment Videos

The feasibility study of the octane-enhancing process: isobutylene dimerization using C4 mixture.

Y J Huang1, Yih-Min Sun, F L Chang

  • 1Department of Environmental and Safety Engineering, Chung Hwa College of Medical Technology, Jen-Te Hsiang, Tainan Hsien, Taiwan, ROC.

Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering
|October 10, 2003
PubMed
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Strong acidic ion exchange resin (Amberlyst 15) efficiently catalyzes isobutylene dimerization to diisobutylene. Optimal conditions were identified for high conversion and selectivity, minimizing oligomer formation.

Area of Science:

  • Chemical Engineering
  • Catalysis
  • Organic Chemistry

Background:

  • Isobutylene dimerization is crucial for producing diisobutylene, a valuable chemical intermediate.
  • Efficient catalysts and optimized reaction conditions are needed to maximize dimer selectivity and minimize oligomer byproducts.

Purpose of the Study:

  • To evaluate various catalysts for isobutylene dimerization to diisobutylene.
  • To determine the optimal reaction conditions for Amberlyst 15, a strong acidic ion exchange resin, in both batch and fixed-bed reactors.
  • To investigate the influence of temperature, catalyst loading, solvents, and WHSV on conversion, selectivity, and oligomer formation.

Main Methods:

  • Screening of nickel salts, zeolites, and acidic ion exchange resins as catalysts.
  • Optimization studies using Amberlyst 15 in batch and fixed-bed reactor configurations.

Related Experiment Videos

  • Analysis of reaction parameters including temperature, pressure, catalyst amount, solvent addition, and Weight Hourly Space Velocity (WHSV).

    • Main Results:

    • Amberlyst 15 demonstrated superior performance, achieving 90% conversion and >60% selectivity to diisobutylene under mild conditions (6 kg/cm², 60°C).
    • In batch reactions, increased temperature boosted activity but required shorter reaction times to control oligomerization; increased catalyst amount enhanced rate without altering product composition.
    • In fixed-bed studies, optimal conditions were found to be 45°C with a WHSV of 10, balancing reaction rate and selectivity.
    • Addition of methyl tert-butyl ether effectively inhibited oligomer formation.

    Conclusions:

    • Amberlyst 15 is a highly effective catalyst for isobutylene dimerization.
    • Optimized reaction conditions (45°C, WHSV 10) in a fixed-bed reactor maximize diisobutylene yield while minimizing oligomer formation.
    • Process parameters like temperature, catalyst loading, and solvent presence significantly impact reaction outcomes.