Catalyst for preparing 2-methyl furan through gas phase hydrogenation of furfural and preparation method thereof

Abstract

The invention discloses a catalyst for preparing 2-methyl furan through gas phase hydrogenation of furfural and a preparation method thereof. The catalyst consists of the following components in percentage by weight: 45 to 60 percent of copper oxide CuO, 30 to 40 percent of chromic oxide CR2O3, 1 to 10 percent of alumina Al2O3 and 1 to 5 percent of silicon oxide SiO2, and is prepared by a coprecipitation method. The catalyst has the characteristics of low activation temperature, long service life, and high selectivity of the 2-methyl furan, and can be used for industrial production of the 2-methyl furan through gas phase hydrogenation of the furfural.

Description

technical field

[0001] The invention relates to a catalyst for preparing 2-methylfuran by gas-phase hydrogenation of furfural and a preparation method thereof Background technique

[0002] 2-Methylfuran is an important chemical raw material, which can be used to prepare pentadiene, pentanediol, acetylpropanol, methyltetrahydrofuran, etc. In the pharmaceutical industry, it can be used to produce VB1, anti-dysentery drugs chloroquine phosphate and primaquine phosphate and other drugs.

[0003] Currently, 2-methylfuran is produced industrially by gas-phase catalytic hydrogenation of furfural. my country is a major producer of furfural, with an annual output of more than 200,000 tons of furfural. Among furfural deep-processing products, 2-methylfuran is a product with high value.

[0004] Soviet patent SU941366 reported the use of CuO-Cr 2 o 3 / Graphite or Al 2 o 3 As a catalyst, carry out gas-phase hydrogenation of furfural to prepare 2-methylfuran. At a temperature of 2...

Examples

Embodiment 1

[0027] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 24.1g, chromium nitrate (Cr(NO 3 ) 3 9H 2 (O) 31.6g, miscible in 200ml deionized water; weigh 20% Al 2 o 3 Aluminum sol 7.1g, containing SiO 2 1.9 g of 25% silica sol was mixed and diluted with 300 ml of deionized water. First put the aluminum sol-silica sol mixture into the reaction kettle, and under constant stirring, mix the copper-chromium mixture with 1M Na 2 CO 3 Add the solution in parallel, control the pH value of the reaction at about 7, and raise the temperature of the reaction solution to 60°C at the same time. Roast for 2 hours, add 1.5% graphite to form a tablet, which is sample A.

Embodiment 2

[0029] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 26.0g, chromic anhydride (CrO 3 )7.2g, miscible in 200ml deionized water; weigh 20% Al 2 o 3 Aluminum sol 4.3g, containing SiO 2 1.7 g of 40% silica sol was mixed and diluted with 300 ml of deionized water. First put the aluminum sol-silica sol mixture into the reaction kettle, and under constant stirring, mix the copper-chromium mixture with 1M Na 2 CO 3 Add the solution in parallel, control the pH value of the reaction at about 7.5, and raise the temperature of the reaction solution to 70°C at the same time. Roast for 2 hours, add 1.5% graphite to form a tablet, which is sample B.

Embodiment 3

[0031] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 25.0g, chromium nitrate (Cr(NO 3 ) 3 9H 2 O) 28.9g, miscible in 200ml deionized water; Weigh aluminum nitrate (Al(NO 3 ) 3 9H 2 O) 7.8g, containing 25% SiO 2 Mix 1.8 g of water glass and add 300 ml of deionized water to dilute. First put the aluminum nitrate-water glass mixture into the reaction kettle, and under constant stirring, mix the copper-chromium mixture with 1M Na 2 CO 3The solution is added in parallel, and the reaction pH value is controlled at about 7. At the same time, the temperature of the reaction solution is raised to 65°C. Roast for 3.5 hours, add 1.5% graphite to form a tablet, which is sample C.

[0032] The prepared catalyst is used in the gas-phase hydrogenation of furfural to produce 2-methylfuran. The reaction conditions are: reaction temperature 180°C, normal pressure, liquid space velocity 0.5hr -1 Under conditions, after 1000 hours of operation, the furfural conversion rate of the catalys...

technical field

[0001] The invention relates to a catalyst for preparing 2-methylfuran by gas-phase hydrogenation of furfural and a preparation method thereof Background technique

[0002] 2-Methylfuran is an important chemical raw material, which can be used to prepare pentadiene, pentanediol, acetylpropanol, methyltetrahydrofuran, etc. In the pharmaceutical industry, it can be used to produce VB1, anti-dysentery drugs chloroquine phosphate and primaquine phosphate and other drugs.

[0003] Currently, 2-methylfuran is produced industrially by gas-phase catalytic hydrogenation of furfural. my country is a major producer of furfural, with an annual output of more than 200,000 tons of furfural. Among furfural deep-processing products, 2-methylfuran is a product with high value.

[0004] Soviet patent SU941366 reported the use of CuO-Cr 2 o 3 / Graphite or Al 2 o 3 As a catalyst, carry out gas-phase hydrogenation of furfural to prepare 2-methylfuran. At a temperature of 2...

Examples

Embodiment 1

[0027] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 24.1g, chromium nitrate (Cr(NO 3 ) 3 9H 2 (O) 31.6g, miscible in 200ml deionized water; weigh 20% Al 2 o 3 Aluminum sol 7.1g, containing SiO 2 1.9 g of 25% silica sol was mixed and diluted with 300 ml of deionized water. First put the aluminum sol-silica sol mixture into the reaction kettle, and under constant stirring, mix the copper-chromium mixture with 1M Na 2 CO 3 Add the solution in parallel, control the pH value of the reaction at about 7, and raise the temperature of the reaction solution to 60°C at the same time. Roast for 2 hours, add 1.5% graphite to form a tablet, which is sample A.

Embodiment 2

[0029] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 26.0g, chromic anhydride (CrO 3 )7.2g, miscible in 200ml deionized water; weigh 20% Al 2 o 3 Aluminum sol 4.3g, containing SiO 2 1.7 g of 40% silica sol was mixed and diluted with 300 ml of deionized water. First put the aluminum sol-silica sol mixture into the reaction kettle, and under constant stirring, mix the copper-chromium mixture with 1M Na 2 CO 3 Add the solution in parallel, control the pH value of the reaction at about 7.5, and raise the temperature of the reaction solution to 70°C at the same time. Roast for 2 hours, add 1.5% graphite to form a tablet, which is sample B.

Embodiment 3

[0031] Weigh copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 25.0g, chromium nitrate (Cr(NO 3 ) 3 9H 2 O) 28.9g, miscible in 200ml deionized water; Weigh aluminum nitrate (Al(NO 3 ) 3 9H 2 O) 7.8g, containing 25% SiO 2 Mix 1.8 g of water glass and add 300 ml of deionized water to dilute. First put the aluminum nitrate-water glass mixture into the reaction kettle, and under constant stirring, mix the copper-chromium mixture with 1M Na 2 CO 3The solution is added in parallel, and the reaction pH value is controlled at about 7. At the same time, the temperature of the reaction solution is raised to 65°C. Roast for 3.5 hours, add 1.5% graphite to form a tablet, which is sample C.

[0032] The prepared catalyst is used in the gas-phase hydrogenation of furfural to produce 2-methylfuran. The reaction conditions are: reaction temperature 180°C, normal pressure, liquid space velocity 0.5hr -1 Under conditions, after 1000 hours of operation, the furfural conversion rate of the catalys...