Methanol carbonylation process

Details Methanol carbonylation process Methanol carbonylation process

1991-01-07

1992-09-01

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

203 77, 203 81, 203 88, 560232, 562607, 562608, C07C 5112, C07C 5308

Patent

active

051440687

ABSTRACT:
An alcohol such as methanol is reacted with carbon monoxide in a liquid reaction medium containing a rhodium catalyst stabilized with an iodide salt, especially lithium iodide, along with alkyl iodide such as methyl iodide and alkyl acetate such as methyl acetate in specified proportions. With a finite concentration of water in the reaction medium the product is the carboxylic acid instead of, for example, the anhydride. The present reaction system not only provides an acid product of unusually low water content at unexpectedly favorable reaction rates but also, whether the water content is low or, as in the case of prior-art acetic acid technology, relatively high, is characterized by unexpectedly high catalyst stability; i.e., it is resistant to catalyst precipitation out of the reaction medium.

REFERENCES:
patent: 5001259 (1991-03-01), Smith et al.
Forster, D. et al., Homogeneous Catalytic Reactions of Methanol with Carbon Monoxide, Journal of Molecular Catalysis, 17 (1982) 299-314.
Roth, J. P. et al., Low Pressure for Acetic Acid via Carbonylation, Chem. Tech., Oct. 1971, 600-605.

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