本文描述了以SnX_m配位的铑(Ⅰ)络合催化剂在甲醇羰基合成醋酸中的热稳定性。当操作压力为30kg/cm~2,反应温度在155—180℃范围内,发现该催化剂不因一氧化碳分压改变或供给不足、分布不均等而引起分解沉淀。甚至一氧化碳分压为零,半小时内,也未发现该催化剂有分解沉淀现象。但反应在某一温度以上时,该催化剂的热稳定性则受一氧化碳分压的控制。反应深度(甲醇转化率)在50—100％范围内,反应产物在直接蒸馏中或长时间蒸煮时,该催化剂都表现出良好的热稳定性,并能保持一定的羰基化反应速度。 This article describes the thermal stability of rhodium (I) complexed catalysts coordinated with SnX_m in methanol-carbonyl synthesis of acetic acid. When the operating pressure is 30 kg / cm ~ 2 and the reaction temperature is in the range of 155-180 ℃, it is found that the catalyst does not decompose and precipitate due to partial pressure change of carbon monoxide or insufficient supply and uneven distribution. Even partial pressure of carbon monoxide zero, within half an hour, also did not find the catalyst decomposition phenomenon. However, when the reaction is above a certain temperature, the thermal stability of the catalyst is controlled by the partial pressure of carbon monoxide. The reaction depth (methanol conversion) in the range of 50-100%, the reaction product in the direct distillation or cooking for a long time, the catalyst showed good thermal stability, and can maintain a certain rate of carbonylation reaction.