Gas phase reaction kinetics of boron fiber production
Bor fiber üretimi gaz faz reaksiyon kinetiği
- Tez No: 153590
- Danışmanlar: PROF. DR. ÖNDER ÖZBELGE, DOÇ. DR. NAİME ASLI SEZGİ
- Tez Türü: Yüksek Lisans
- Konular: Kimya Mühendisliği, Chemical Engineering
- Anahtar Kelimeler: CVD, Boron Fiber Production, Gas Phase Reaction Kinetics, Dicloroborane. iv, CVD, Boron Fiber Production, Gas Phase Reaction Kinetics, Dicloroborane. iv
- Yıl: 2004
- Dil: İngilizce
- Üniversite: Orta Doğu Teknik Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Kimya Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 111
Özet
ABSTRACT GAS PHASE REACTION KINETICS OF BORON FİBER PRODUCTION Fırat, Fatih M.S., Department of Chemical Engineering Supervisor: Prof. Dr. H. Önder Özbelge Co-supervisor: Assoc. Prof. Dr. Naime Aslı Sezgi June 2004,92 pages in the production of boron fibers using CVD technique, boron deposition and dichloroborane formation reactions take place in a reactor. Boron deposition reaction occurs at the surface while formation of dichloroborane is the result of both gas phase and surface reactions. A CSTR type of reactor was designed and constructed from stainless steel to investigate the gas phase reaction kinetics and kinetic parameters of boron fibers produced from the reaction of boron trichloride and hydrogen gases in a CVD reactor. The gases were heated by passing through the two pipes which were located into the ceramic fiırnace and they were mixed in the CSTR. The effluent gas mixture of the reactor was quenched by passing through a heat exchanger. An FT-IR spectrophotometer was connected to the heat exchanger outlet strearo to perfonn on- iiiline chemical analysis of the effluent gas mixture. Experiments were carried out at atmospheric pressure and a reactor temperature range of 300-600 °C with different inlet reactant concentrations. The analysis of the FT-IR spectra indicated that the gas phase reaction and the surface reaction started at reactor temperatures above 170 °C and 500°C, respectively. it was concluded that reaction rate of the product increased with an increase in the inlet concentration of both reactants (BClj and Ha) and with an increase in the reactor temperature. The gas phase reaction rate was expressed in terms of a * and b * orders with respect to tiıe inlet concentrations of BCb and Ha. The activation energy of the gas phase reaction, a and b were found to be 30.156kJ/mol, 0.54 and 0.64, respectively. The correlation coefficient was 0.9969.
Özet (Çeviri)
ABSTRACT GAS PHASE REACTION KINETICS OF BORON FİBER PRODUCTION Fırat, Fatih M.S., Department of Chemical Engineering Supervisor: Prof. Dr. H. Önder Özbelge Co-supervisor: Assoc. Prof. Dr. Naime Aslı Sezgi June 2004,92 pages in the production of boron fibers using CVD technique, boron deposition and dichloroborane formation reactions take place in a reactor. Boron deposition reaction occurs at the surface while formation of dichloroborane is the result of both gas phase and surface reactions. A CSTR type of reactor was designed and constructed from stainless steel to investigate the gas phase reaction kinetics and kinetic parameters of boron fibers produced from the reaction of boron trichloride and hydrogen gases in a CVD reactor. The gases were heated by passing through the two pipes which were located into the ceramic fiırnace and they were mixed in the CSTR. The effluent gas mixture of the reactor was quenched by passing through a heat exchanger. An FT-IR spectrophotometer was connected to the heat exchanger outlet strearo to perfonn on- iiiline chemical analysis of the effluent gas mixture. Experiments were carried out at atmospheric pressure and a reactor temperature range of 300-600 °C with different inlet reactant concentrations. The analysis of the FT-IR spectra indicated that the gas phase reaction and the surface reaction started at reactor temperatures above 170 °C and 500°C, respectively. it was concluded that reaction rate of the product increased with an increase in the inlet concentration of both reactants (BClj and Ha) and with an increase in the reactor temperature. The gas phase reaction rate was expressed in terms of a * and b * orders with respect to tiıe inlet concentrations of BCb and Ha. The activation energy of the gas phase reaction, a and b were found to be 30.156kJ/mol, 0.54 and 0.64, respectively. The correlation coefficient was 0.9969.
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