TH30104B - Two-step gold additive method for the preparation of vinyl acetate catalyst. - Google Patents

Abstract

DC60 Method for the preparation of a catalyst that impregnates the catalyst carrier with a hydrochloric acid compound. Palladium and soluble gold are combined by fixation. and then reducing the compounds of palladium and Gold immobilized to palladium and gold followed by carrier impregnation with a second quantity of Soluble gold compounds freeze the second quantity of the compound of gold and reduce it to gold metal then made Alkali acetate impregnation catalysts such as potassium acetate may be used to synthesize unsaturated esters such as vinyl acetate. Prepare a catalyst that impregnates the catalyst carrier with compounds of palladium and soluble gold combined by fixation and then reduces the immobilized palladium and gold compounds to palladium metals. Diam and gold followed by impregnation with a second amount of soluble gold compounds. Fix a second quantity of the gold compound and reduce it to gold and then impregnate the catalyst with an alkali acetate such as potassium acetate. A catalyst may be used to synthesize esters. unsaturated materials such as vinyl acetate

Claims (9)

1. A method for preparing a catalyst for the synthesis of unsaturated ester that makes a catalyst vehicle. Soaked with water-soluble palladium compounds. And water-soluble gold compounds Fixation of water-soluble palladium assembly And a water-soluble gold compound with a vehicle in the form of insoluble palladium compounds And insoluble gold compounds were applied to the vehicle and the reduction of insoluble palladium compounds to palladium metal and insoluble gold compounds to gold metal. Improvements include impregnation and fixation of individual gold compounds. The watermark was obtained in two steps, equal to the first quantity of the soluble gold compound, soaked onto the carrier and then immobilized in the condition of the first quantity of the insoluble gold compound. This was followed by second impregnation of the soluble gold compound. The second content of the gold compound was immobilized in the condition of the second quantity of insoluble gold compounds. 2. Method of claim 1 that immobilize the soluble palladium compounds with the carrier of the accelerator. Previous reactions, impregnation and Immobilize the carrier of the catalyst with the first quantity of the dissolved gold compound. 3. Method of claim 1 to conduct the soluble palladium compound and the first quantity. The water-soluble gold compound impregnated and then immobilized the carrier of the catalyst at the same time. 4. Method of claim 1 was to reduce the palladium compounds. At the same time, 5. The method of claim 2 reduction of the immobilized palladium compounds. And the first quantity of the dissolved gold compound is a palladium metal. Previous: Second impregnation of the catalyst carrier 6. Method of claim 1 that immobilize the soluble palladium compounds. By immersing the impregnated carrier with a water-soluble palladium compound in a solution containing the reactant containing the soluble palladium compound for approximately 16 hours to form the pulsidium compound. Diem insoluble Precipitation on the impregnation carrier 7. Method of claim 1, to rotate the impregnated carrier with a water-soluble palladium. In a solution containing a reactant with water-soluble palladium compounds to form water-soluble palladium compounds. To precipitate completely 8. Method of claim 7: Rotate the impregnated carrier from approximately 1 to approximately 10 rpm for a minimum of approximately 0.5 h. 9. Method of impregnation. Claim 1: Rotating carriers impregnated with a certain amount of gold compound. Soluble in aqueous solutions containing reactive compounds with soluble gold compounds. In order for the insoluble gold compound to precipitate completely 1 0. Method of claim 9, rotating the impregnated carrier from approximately 1 to approximately 10 rpm for a minimum of approximately 0.5 h 1 1. Method Of claim 1, the carrier spin contains the second quantity of the soluble gold compound. In order for the insoluble gold compound to be completely precipitated 1 2. Method of claim 11, rotating the carrier from approximately 1 to approximately 10 cycles per minute for a minimum of approximately 0.5 h 1 3. Method of holding Right 1 Immobilize the first volume of the water-soluble gold compound impregnated on the carrier by immersing the impregnated carrier in a solution containing the reactive compound. With the first quantity of the dissolved gold compound for approximately 16 hours, the insoluble gold compound of the first quantity of the gold compound The insoluble first volume of aqueous gold solution was precipitated 1 4. Method of claim 1: second-volume immobilization of the water-soluble compound of gold impregnated on the carrier by dipping the carrier. Impregnated in solutions containing reactive compounds With the second volume of soluble gold aqueous solution for approximately 16 hours, to precipitate the insoluble gold compound from the second volume of the soluble gold compound, precipitate 1 5. Method of claim 1. The carrier was impregnated with a second-content solution of a water-soluble gold compound and fixed compound 1 6. Method of claim 1 was to reduce the insoluble palladium compounds and the unstable quantity. The first and second of insoluble gold compounds To palladium and gold with reducing agents Which contains ethylene or hydrazine 1 7. Method of claim 16 that reducing agents Which is hydrazine And the weight-by-weight ratio of hydrazine to palladium metal and gold was approximately 12: 1 1 8. Method of claim 1 that fixation of insoluble palladium compounds and a certain volume of The two-stage insoluble gold compound performs the first step immobilization with a solution containing the compound susceptible to the water-soluble palladium compounds. And sensitive to reaction At one of the water-soluble gold compounds to precipitate insoluble palladium compounds And the first quantity of insoluble gold compounds on the carrier The carrier was then exposed to an additional solution containing the palladium compounds and soluble gold in the second fixation step to precipitate the palladium and gold compounds on the carrier. Continued 1 9. The method of claim 1 also includes carrier impregnation. Alkali Acetate Metals 2 0. Claim Method 19 In which the alkali acetate metal is composed of potassium acetate, sodium azutate, lithium. Yum acetate, rubidium acetate And cesium acetate 2 1. The method of claim 1 also consists of washing and drying the carrier after each fixation step 2. 2. Method of claim 1 that soluble palladium salts include Palladium chloride, sodium palladium chloride or palladium nitrate 2. 3. Method of claim 1 in which water soluble gold compounds are composed of oric chloride. Or Oric Acid 2 4. Method of claim 1 that fixes the water-soluble palladium compounds. And the first quantity of a water-soluble gold compound with carrier in the fixation solution containing Sodium ions at the ratio by weight of sodium ions to chloride ions from pulldium compounds. Water soluble, and the first content of water-soluble gold compounds is approximately 1: 2: 1 2. 5. Method of claim 1 that fixes a second water-soluble gold compound with a carrier in a fixation solution composed of sodium ions at any ratio by weight of sodium ions to chloride ions. However, from the second quantity of the soluble gold compound is approximately 1: 8: 1 2. 6. Method of claim 1, where the content of the palladium metal on the carrier of the catalyst is compounded by the concentration. Equals from approx 1.5 g / l to approx 14 g / l 2 7. Method of claim 1 where the content of the palladium metal on the catalyst is approximately 7 g / l and the amount of the gold metal on the catalyst is approximately 7 g / l 2. 8. Method of claim 1 where the catalyst has a ratio by weight of gold / palladium equal to approximately 0.2: 1 to approx. 2: 1 2 9. The claim 1 method is to add from approximately 1/2 to approximately 3/4 of the total gold on the catalyst during the first impregnation step and the remainder to be added to the impregnation step. Second