Oxalate production method of catalyst combination packing
A production method and catalyst technology, applied in the direction of carbon monoxide or formate reaction preparation, organic chemistry, etc., can solve the problems of low selectivity of the target product oxalate, low single-pass conversion rate of raw materials, etc.
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Embodiment 1
[0015] The reactor for CO coupling production of dimethyl oxalate is a fixed-bed reactor with tubes, the catalyst is installed inside the tubes, and the cooling medium is outside the tubes. The molar ratio of CO and methyl nitrite entering the reactor is 1.2:1, the feed temperature is 100°C, and the pressure is 0.3MPa. There are two catalyst beds in the column tube, and the height of the upper and lower catalyst beds is H 2 / H 1 =2:1, the catalyst in the upper catalyst bed is Pd / Al 2 o 3 Catalyst, only supported palladium, by the weight of elemental palladium, the consumption of oxides selected from palladium is 0.5% by weight, and the catalyst in the lower catalyst bed is Pd-Ni / Al 2 o 3 Catalyst, based on the weight of elemental palladium, the amount of oxides selected from metal palladium and palladium is 0.3% by weight, the additive Ni is based on the weight of elemental nickel, and the amount of oxides selected from nickel is 1% by weight. %. Under the above condition...
Embodiment 2
[0017] The reactor for CO coupling to produce dimethyl oxalate is a tubular fixed-bed reactor with a catalyst outside the tube and a cooling medium inside the tube. The form of the reactor is the same as that in Chinese patent 200910057857.6. The molar ratio of CO and methyl nitrite entering the reactor is 3:1, the feed temperature is 70°C, and the pressure is 0.1MPa. The tubes contain three catalyst beds, and the height ratio of the three catalyst beds is H 3 / H 2 / H 1 =3:1.5:1, the catalyst in the first catalyst bed is Pd-Ni / Al 2 o 3 Catalyst, based on the weight of elemental palladium, the amount of oxides selected from metal palladium and palladium is 2% by weight, the additive Ni is based on the weight of elemental nickel, and the amount of oxides selected from nickel is 0.5% by weight %, the catalyst in the second catalyst bed is Pd-Ce / Al 2 o 3 Catalyst, based on the weight of elemental palladium, the amount of oxides selected from metal palladium and palladium is 1...
Embodiment 3
[0019] The reactor for CO coupling to produce diethyl oxalate is a fixed-bed reactor with tubes, the catalyst is installed inside the tubes, and the cooling medium is outside the tubes. The molar ratio of CO and ethyl nitrite entering the reactor is 5:1, the feed temperature is 140°C, and the pressure is 1.0MPa. The tubes contain three catalyst beds, and the height ratio of the three catalyst beds is H 3 / H 2 / H 1 =5:3:1, the catalyst in the first catalyst bed is Pd-Ti / (Al 2 o 3 +SiO2 2 ) catalyst, based on the weight of elemental palladium, the amount of oxides selected from palladium is 0.45% by weight, the auxiliary agent Ti is based on the weight of elemental titanium, and the amount selected from metal titanium is 0.5% by weight, the second The catalyst in the stage catalyst bed is Pd-Co / Al 2 o 3 Catalyst, based on the weight of elemental palladium, the amount of oxides selected from metal palladium and palladium is 0.3%, and the auxiliary agent Co is based on the w...
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