Addition of hydrogen to carbon monoxide feed gas in producing ac

Details Addition of hydrogen to carbon monoxide feed gas in producing ac Addition of hydrogen to carbon monoxide feed gas in producing ac

1987-08-05

1991-02-19

Garner, Vivian

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

Organic compounds

Carboxylic acids and salts thereof

203 71, 203 77, 203 88, 260413, 562517, C07C 5112, C07C 5308

Patent

active

049946080

ABSTRACT:
The carbonylation of an alcohol to produce a carboxylic acid, especially methanol to produce acetic acid, in a low water 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 is improved by the addition of hydrogen in the feed gas to the low water reaction medium to obtain a reactor hydrogen partial pressure of at least about 4 psi. The presence of hydrogen in the reaction medium increases significantly the carbonylation reaction rate and reduces formation of byproduct carbon dioxide. 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: 3769329 (1973-10-01), Paulik et al.
patent: 4374070 (1983-02-01), Larkins et al.
Roth et al., Chem. Tech., vol. 1, Oct. 1971, pp. 600-605.

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