Methods for producing alcohol

Abstract

This invention relates to a method for producing alcohol from synthesis gas, which improves alcohol selectivity and allows for more selective acquisition of alcohol. [Solution] A method for producing alcohol comprising the following steps 1 and 2. Step 1: In a protic solvent, a cobalt-containing compound (a) and a copper-containing compound (b), both soluble in the protic solvent, are mixed such that the amount of copper per mole of cobalt is 0.2 moles or more and 0.7 moles or less. The mixture is then reacted with a divalent or higher carboxylic acid compound (c) to obtain a catalyst from the reaction product. Catalyst manufacturing process. Step 2: Alcohol production process, in which synthesis gas is reacted in the presence of the catalyst obtained in Step 1 to obtain alcohol.

Claims

1. A method for producing alcohol, comprising the following steps 1 and 2. Step 1: Mix a cobalt-containing compound (a) and a copper-containing compound (b), both soluble in a protic solvent, in a protic solvent such that the amount of copper per 1 mol of cobalt is 0.2 mol or more and 0.7 mol or less. React the mixture with a divalent or higher carboxylic acid compound (c) in which the protic solvent contains isopropanol, and obtain a catalyst from the reaction product. Catalyst manufacturing process. Step 2: In the presence of the catalyst obtained in Step 1, carbon monoxide (CO) and hydrogen (H) ２ A synthesis gas containing H in relation to CO. ２ Mol ratio (H ２ Alcohol production process: Reacting synthesis gas with a CO content of 1.0 to 2.5 to obtain alcohol.

2. The method for producing an alcohol according to claim 1, wherein the dielectric constant of the protic solvent at 20°C is 3.0 or more and 85.0 or less.

3. The method for producing alcohol according to claim 1, wherein a gas phase is present in the reaction system when alcohol is produced in step 2, and the reaction pressure (gauge pressure) of the gas phase is 3.0 MPa or more and 50 MPa or less.

4. The method for producing alcohol according to any one of claims 1 to 3, wherein (c) contains one or more selected from the group consisting of oxalic acid and citric acid.

5. The method for producing an alcohol according to any one of claims 1 to 3, wherein step 1 is a catalyst production step comprising: mixing a cobalt-containing compound (a) and a copper-containing compound (b), which are soluble in the protic solvent, in a protic solvent such that the amount of copper per 1 mol of cobalt is 0.2 mol or more and 0.7 mol or less; co-precipitating with a precipitating agent containing the divalent or higher carboxylic acid compound (c); and obtaining a catalyst from the co-precipitated reaction product.

6. The method for producing alcohol according to any one of claims 1 to 3, wherein step 1 comprises the following steps 1a, 1b, and 1c. Step 1a: A step to obtain a raw material solution by uniformly dissolving the cobalt-containing compound (a) and the copper-containing compound (b) in the protic solvent such that the amount of copper per 1 mol of cobalt is 0.2 mol or more and 0.7 mol or less. Step 1b: A step of dissolving the precipitant containing the divalent or greater carboxylic acid compound (c) in the protic solvent to obtain a precipitant solution. Step 1c: A step of mixing the raw material solution obtained in Step 1a with the precipitant solution obtained in Step 1b to coprecipitate the cobalt-containing compound (a) and the copper-containing compound (b).

7. A method for producing alcohol according to any one of claims 1 to 3, further comprising the step of separating the coprecipitated reactants from the mixed solution after the reaction and drying them in step 1.

8. A method for producing alcohol according to any one of claims 1 to 3, further comprising the steps of separating the coprecipitated reactants from the mixed solution after the reaction in step 1, drying them, and further performing a reduction treatment and an immobilization treatment on the obtained dried product.

9. The method for producing alcohol according to claim 8, wherein the temperature of the immobilization treatment is 0°C or higher and 100°C or lower.

10. The method for producing alcohol according to claim 8, wherein the time for the immobilization treatment is 30 minutes or more and 10 hours or less.

11. The method for producing alcohol according to claim 8, wherein the immobilization treatment is carried out with an oxygen-containing gas, and the oxygen concentration in the oxygen-containing gas during the immobilization treatment is 0.1% by volume or more and 10% by volume or less.

12. The method for producing alcohol according to any one of claims 1 to 3, wherein step 2 is carried out in a slurry bed reactor.

13. A method for producing an alcohol from synthesis gas, comprising: mixing a cobalt-containing compound (a) and a copper-containing compound (b), both soluble in a protic solvent, in a protic solvent such that the amount of copper per 1 mol of cobalt is 0.2 mol or more and 0.7 mol or less; reacting the mixture with a divalent or higher carboxylic acid compound (c) in which the protic solvent contains isopropanol; and obtaining a catalyst from the reactant.

14. In a protic solvent, a cobalt-containing compound (a) and a copper-containing compound (b), both soluble in the protic solvent, are mixed such that the amount of copper per 1 mol of cobalt is 0.2 mol or more and 0.7 mol or less; the protic solvent is reacted with a divalent or higher carboxylic acid compound (c) containing isopropanol; and the catalyst obtained from the reaction product is used to produce alcohol by reacting carbon monoxide and hydrogen in synthesis gas.

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