公开(公告)号：US4994608A

公开(公告)日：1991-02-19

申请号：US82945

申请日：1987-08-05

申请人： G. Paull Torrence ,  Joel D. Hendricks ,  Dennis D. Dickinson ,  Adolfo Aguilo

发明人： G. Paull Torrence ,  Joel D. Hendricks ,  Dennis D. Dickinson ,  Adolfo Aguilo

IPC分类号： C07B61/00 ,  B01J23/00 ,  B01J23/46 ,  B01J31/00 ,  B01J31/20 ,  C07C51/00 ,  C07C51/12 ,  C07C53/08 ,  C07C67/00

CPC分类号： C07C51/12

摘要： 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.

摘要翻译： 在含有用碘化物盐特别是碘化锂稳定的铑催化剂的低水反应介质中，醇的羰基化以产生羧酸，特别是甲醇以制备乙酸，以及烷基碘如甲基碘和乙酸烷基酯等稳定的铑催化剂 因为通过在低水反应介质的进料气体中加入氢气以获得至少约4psi的反应器氢分压来改善特定比例的乙酸甲酯。 反应介质中氢的存在显着提高了羰基化反应速率，并减少了副产物二氧化碳的形成。 本反应体系不仅提供出乎意料的良好反应速率的异常低水含量的酸产物，而且无论水含量低，或者如现有技术乙酸技术的情况相对较高，其特征在于意想不到 高催化剂稳定性; 即耐反应介质中的催化剂沉淀。