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

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Graduation Date

1977

Advisor

Clausen, Chris A.

Degree

Master of Science (M.S.)

College

College of Natural Sciences

Degree Program

Industrial Chemistry

Format

PDF

Pages

v, 54 pages

Language

English

Rights

Public Domain

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0012921

Subjects

Fluorine -- Analysis, Fluorocarbons

Contributor (Linked data)

Clausen, Chris A., 1940- [VIAF]

Clausen, Chris A., 1940- [LC]

Collection (Linked data)

Retrospective Theses and Dissertations

Included in

Chemistry Commons

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