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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Ionic liquid and solid HF equivalent amine-poly(hydrogen fluoride) complexes effecting efficient environmentally

George A Olah1, Thomas Mathew, Alain Goeppert

  • 1Donald P. and Katherine B. Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, California 90089-1661, USA. olah@usc.edu

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|April 21, 2005
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Summary

New "green" catalysts using immobilized hydrogen fluoride (HF) complexes offer safer, high-octane isoparaffin-olefin alkylation. These ionic liquid and solid catalysts maintain HF activity while reducing environmental hazards from volatile HF.

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Area of Science:

  • Catalysis
  • Green Chemistry
  • Petroleum Refining

Background:

  • Traditional alkylation processes often rely on hazardous and volatile catalysts like anhydrous hydrogen fluoride (HF).
  • Minimizing environmental risks and improving safety are key challenges in acid catalysis for hydrocarbon processing.
  • Development of alternative catalytic systems with reduced volatility and comparable or superior performance is essential.

Purpose of the Study:

  • To investigate novel immobilized poly(hydrogen fluoride) catalysts for isoparaffin-olefin alkylation.
  • To evaluate the efficacy of liquid and solid onium poly(hydrogen fluoride) complexes as HF-equivalent catalysts.
  • To assess the environmental benefits and catalytic performance of these new "green" catalyst systems.

Main Methods:

  • Synthesis of liquid and solid onium poly(hydrogen fluoride) catalysts using various amines and nitrogen-containing polymers.
  • Testing of these catalysts in isoparaffin-olefin alkylation reactions, specifically isobutane-isobutylene and 2-butene alkylation.
  • Analysis of alkylate yields and octane numbers (RON).
  • Evaluation of catalyst volatility and environmental impact.

Main Results:

  • Excellent yields of high-octane alkylates (up to RON = 94) were achieved using both liquid and solid catalyst systems.
  • The immobilized catalysts demonstrated strong catalytic performance comparable to traditional HF catalysts.
  • The poly(hydrogen fluoride) complexes exhibited significantly reduced volatility compared to free HF, minimizing environmental hazards.

Conclusions:

  • Immobilized poly(hydrogen fluoride) catalysts, including ionic liquids and solid complexes, represent a viable and "green" alternative for isoparaffin-olefin alkylation.
  • These novel catalyst systems effectively maintain the high activity of HF while substantially mitigating its associated environmental risks.
  • The development offers a promising pathway towards safer and more sustainable practices in the petroleum refining industry.