Keywords
Fluorine analysis, Fluorocarbons
Abstract
The catalytic, vapor-phase fluorination of dichloromethane to chlorofluoromethane with 38% hydrofluoric acid was investigated as a model system for possible direct utilization of hydrofluoric acid in the production of fluorocarbons and chlorofluorocarbons. Catalysts consisting of Cr or Ni supported on alumina and Ni, Cr, Ag, Co, La, Sn, Hg(I), Hg(II), Cu, Fe, Ru, Zn, Na, or Ca supported on activated charcoal were utilized at various reaction temperatures and reactor residence times. Alumina-supported catalysts were found to have low activities for fluorination in comparison to catalysts utilizing anhydrous HF reported in the patent literature. The low activities were attributed to low catalyst surface areas resulting from the fluorination of the catalyst with aqueous HF. Carbon-supported catalysts were found, in general, to promote thermal cracking of the CH2Cl2 feed as well as the fluorination reaction. This thermal cracking was usually sufficiently severe to result in drastically lowered yields of the desired product and low catalyst lifetime due to coking. The greatest selectivities for the desired product, CH2ClF, relative to the difluorinated product, CH2F2, at reasonably high conversions, were obtained with Sn, Cu, or Co fluorides on an activated charcoal support, although overall yields were relatively low due to thermal cracking.
Notes
If this is your thesis or dissertation, and want to learn how to access it or for more information about readership statistics, contact us at STARS@ucf.edu
Graduation Date
1977
Advisor
Clausen, Chris A.
Degree
Master of Science (M.S.)
College
College of Natural Sciences
Degree Program
Industrial Chemistry
Format
Pages
54 p.
Language
English
Rights
Public Domain
Length of Campus-only Access
None
Access Status
Masters Thesis (Open Access)
Identifier
DP0012921
Subjects
Fluorine -- Analysis, Fluorocarbons
STARS Citation
Myers, Michael O., "Catalytic Fluorination of Dichloromethane with Hydrofluoric Acid" (1977). Retrospective Theses and Dissertations. 363.
https://stars.library.ucf.edu/rtd/363
Collection (Linked data)
Accessibility Status
Searchable text