一氧化碳和亚硝酸酯合成草酸酯和草酸

Synthesis of oxalate and. oxalic acid via coupling of CO with nitrous acid esters

研究了在Ｐｄ／α－Ａｌ２Ｏ３催化剂上，一氧化碳和亚硝酸酯偶联合成草酸酯、草酸酯水解、副产ＮＯ再生成亚硝酸酯的反应。其催化活性为１０００ｈ，平均时空产率为：６１１．５ｇＤＭＯ／Ｌｃａｔ·ｈ，草酸酯水解为草酸的收率＞９８％，ＮＯ回收率＞９５－％。

study is carried out on synthesis of oxalate, e. g. dimethyl oxalate (DMO), throughcoupling of CO with nitrous acid esters, e. g.CH3ONO, over Pd/α-Al2O3, hydrolysis ofdimethyl oxalate, and regeneration of the byproduced NO to CH3ONO. The catalyst activity is retained in 1000 hrs the average S/Tyield is 611. 5g DMO/L cat. h in 1000 hours,the yield of oxalic acid from hydrolysis is>98%, and NO recbvery is>95%. The mechanism of DMO formation via coupling of COwith CH3ONO is proposed.