The deactivation-regeneration of catalyst PdCl2-CuCl2-KOAc/AC in the synthesis of dimethyl carbonate （DMC） by gas-phase oxidative carbonylation was studied on the basis of XPS characterization and activity evaluatio...The deactivation-regeneration of catalyst PdCl2-CuCl2-KOAc/AC in the synthesis of dimethyl carbonate （DMC） by gas-phase oxidative carbonylation was studied on the basis of XPS characterization and activity evaluation.The reason for the catalyst deactivation is the loss of chlorine.The activity and stability of the fresh catalyst pretreated with methanol solution of methyl chloroacetate increases greatly.If the deactivated catalyst is treated with methanol solution of methyl chloroacetate and in N2 stream successively, the catalytic activity can be restored effectively and the regeneration induction period can be shortened.The catalytic activity after regeneration tiwice can still be restored to 93% of the fresh catalyst.展开更多
对甲醇气相氧化羰基化法合成碳酸二甲酯(DMC)产物的分离进行了研究。根据甲醇气相氧化羰基化产物的特性提出了预分离-全变压精馏工艺和预分离-倾析工艺。以NRTL方程作为活度系数方程,使用A spen P lus模拟软件优化了分离工艺中的主要参...对甲醇气相氧化羰基化法合成碳酸二甲酯(DMC)产物的分离进行了研究。根据甲醇气相氧化羰基化产物的特性提出了预分离-全变压精馏工艺和预分离-倾析工艺。以NRTL方程作为活度系数方程,使用A spen P lus模拟软件优化了分离工艺中的主要参数并对工艺流程进行了模拟。模拟结果表明,两种分离工艺均能得到合格的DMC、甲醇和缩甲醛产品,得到各精馏塔的主要操作参数,预分离-倾析工艺比预分离-全变压精馏工艺的能耗约低35%。提出的工艺方案可为工业装置设计提供参考。展开更多
文摘The deactivation-regeneration of catalyst PdCl2-CuCl2-KOAc/AC in the synthesis of dimethyl carbonate （DMC） by gas-phase oxidative carbonylation was studied on the basis of XPS characterization and activity evaluation.The reason for the catalyst deactivation is the loss of chlorine.The activity and stability of the fresh catalyst pretreated with methanol solution of methyl chloroacetate increases greatly.If the deactivated catalyst is treated with methanol solution of methyl chloroacetate and in N2 stream successively, the catalytic activity can be restored effectively and the regeneration induction period can be shortened.The catalytic activity after regeneration tiwice can still be restored to 93% of the fresh catalyst.
文摘对甲醇气相氧化羰基化法合成碳酸二甲酯(DMC)产物的分离进行了研究。根据甲醇气相氧化羰基化产物的特性提出了预分离-全变压精馏工艺和预分离-倾析工艺。以NRTL方程作为活度系数方程,使用A spen P lus模拟软件优化了分离工艺中的主要参数并对工艺流程进行了模拟。模拟结果表明,两种分离工艺均能得到合格的DMC、甲醇和缩甲醛产品,得到各精馏塔的主要操作参数,预分离-倾析工艺比预分离-全变压精馏工艺的能耗约低35%。提出的工艺方案可为工业装置设计提供参考。
