rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    non sort: The
    title: study of the methanol conversion to ethylene and propylene using small pore size zeolites
  name:
    name part: Vera-Castaneda, Ernesto
    name part: 1956-
    role:
      role term: creator
  name:
    name part: Akgerman, Aydin
    role:
      role term: degree committee member.
  name:
    name part: Anthony, R. G.
    role:
      role term: degree supervisor.
  name:
    name part: Holland, C. D.
    role:
      role term: degree committee member.
  name:
    name part: Rosynek, M. P.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1985
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiv, 237 leaves : illustrations ; 29 cm
  abstract: Olefins represent the starting point in the formation of the majority of the petrochemical products. The components can be polymerized, copolymerized, and selectively oxidized to a large number of useful products. As crude oil and natural gas which are the conventional sources of olefins increase in price, unconventional sources such as coal and biomass become more attractive. Methanol can be readily produced from coal via synthesis gas, whereas coal represents a highly abundant and scarcely utilized raw material in the United States. In the short term a 60% carbon yield of methanol to olefins would allow methanol to displace naphtha feedstocks in Western Europe and Japan. This project consisted of the study of the kinetics of the reaction of methanol to olefins. A combined selectivity to ethylene and propylene of 90% is readily achieved by selecting a proper set of operating conditions. The investigation encompassed the study of external and internal diffusion, adsorption and reaction. Instantaneous and overall material balances were developed, and a minimization technique was used to calculate the rate of formation of coke, the amount of coke deposited on the catalyst, and the hydrogen to carbon ratio. This procedure allowed the adjustment of several parameters in order to satisfy the material balances. The results were used to calculate the rate constants of the proposed model. The results indicated that the dehydration of methanol was inhibited by the adsorption of methanol. In general low methanol partial pressures, achieved by decreasing the total pressure in the case of pure methanol feeds, or by diluting methanol with water or nitrogen, increased the selectivity toward olefins. All the catalysts studied showed deactivation due to the accumulation of aromatic compounds ("coke"), which had a hydrogen to carbon ratio close to 1.1. The maximum amount of coke that can be deposited on the catalyst was about 0.16 grams coke/gram catalyst. The catalyst was regenerat…
  note: "Major subject: Chemical Engineering."
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. Texas A & M University 1985
  note: Includes bibliographical references (leaves 134-139).
  subject:
    topic: Alkenes
  subject:
    topic: Catalysis
  subject:
    topic: Methanol
  subject:
    topic: Zeolites
  subject:
    topic: Major chemical engineering
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-451548
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-451548
  record info:
    record content source: TXA
    record creation date: 870519
    record change date: 20220103135024.0
    record identifier: in00000434843
    language of cataloging:
      language term: eng