METHOD FOR MANUFACTURING CATALYST FOR MANUFACTURE OF VINYL ACETATE AND METHOD FOR MANUFACTURING VINYL ACETATE
A method for manufacturing a catalyst for manufacture of vinyl acetate, the catalyst containing a carrier, copper, palladium, gold, and an acetate, wherein the method comprises, in the following order: step 1) a step for impregnating the carrier with an alkaline solution; step 2) a step for contact-impregnating the carrier with a solution that contains a copper-containing compound, a palladium-containing compound, and a gold-containing compound, the amount of the solution exceeding a desired amount of carried catalyst components; step 3) a step for separating the carrier from the solution once the desired amount of carried catalyst components is carried by the carrier; step 4) a step for performing reduction treatment; and step 5) a step for causing the carrier to carry the acetate.
1 . A method for producing a catalyst for vinyl acetate production containing a carrier, copper, palladium, gold and an acetate, the method comprising:
Step 1: impregnating the carrier with an alkali solution;
Step 2: subjecting the carrier to contact impregnation with a solution containing a copper-containing compound, a palladium-containing compound, and a gold-containing compound in excessive amounts relative to desired supported amounts of catalyst components which are copper, palladium, and gold, respectively;
Step 3: separating the carrier from the solution when the catalyst components are supported on the carrier in the desired supported amounts of the catalyst components;
Step 4: performing a reduction treatment; and
Step 5: supporting an acetate on the carrier,
in this order.
2 . The production method according to claim 1 , wherein, in Step 2, an excess rate of a charged amount of the gold-containing compound relative to a desired supported amount of gold is from 2% to 150%.
3 . The production method according to claim 1 , wherein, in Step 2, an excess rate of a charged amount of the palladium-containing compound relative to a desired supported amount of palladium is from 2% to 50%.
4 . The production method according to claim 1 , wherein, in Step 2, an excess rate of a charged amount of the copper-containing compound relative to a desired supported amount of copper is from 2% to 50%.
5 . The production method according to claim 1 , wherein a mass of supported metallic copper per 1 kg of the carrier is from 0.25 g to 5.00 g.
6 . The production method according to claim 1 , wherein a mass of supported metallic palladium per 1 kg of the carrier is from 5.00 g to 20.0 g.
7 . The production method according to claim 1 , wherein a mass of supported metallic gold per 1 kg of the carrier is from 4.00 g to 20.0 g.
8 . The production method according to claim 1 , wherein a mass of supported acetate per 1 kg of the carrier is from 40 g to 125 g.
9 . A method for producing vinyl acetate, wherein a catalyst for vinyl acetate production obtained by the method according to claim 1 is used, and ethylene, oxygen and acetic acid are used as raw materials.