| 摘要 |
<p>A process for producing hydrochloromethanes such as chloroform at high selectivity in high yields by reducing polychloromethanes such as carbon tetrachloride in the presence of a reduction catalyst. It is essential to conduct reduction in liquid phase so as to inhibit effectively the concomitant formation of impurities such as a polymer which deactivates the catalyst, whereby the catalyst can fully develop its high selectivity and activity. As the catalyst, at least one element is suitably selected among the group 8, 9 and 10 elements of the Periodic Table, such as ruthenium, rhodium, palladium or platinum. Also suitably usable is a catalyst which is based on any of the above elements and further contains at least one of the group 11 elements such as copper, silver or gold. When the liquid-phase reduction is to be conducted continuously, the use of a fixed bed is desirable, a dropping bed being particularly desirable. This process is also highly valuable as a process for converting carbon tetrachloride, the use of which is legally regulated from the viewpoint of the preservation of the global environment, into, for example, chloroform, which is useful as the starting material of various fluorine compounds.</p> |
