Copper-based catalyst for preparing ethanol by acetate hydrogenation and preparation method

A copper-based catalyst, acetate hydrogenation technology, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of low selectivity, poor stability, low activity, etc., and achieve high reaction activity, The effect of low cost and simple preparation process

Inactive Publication Date: 2015-06-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current catalysts for hydrogenation of acetate to ethanol have problems such as low activity, low selectivity, poor stability, and high cost.

Method used

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  • Copper-based catalyst for preparing ethanol by acetate hydrogenation and preparation method
  • Copper-based catalyst for preparing ethanol by acetate hydrogenation and preparation method
  • Copper-based catalyst for preparing ethanol by acetate hydrogenation and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of the copper-based catalyst that hydrogenates acetate to prepare ethanol comprises the steps:

[0023] (1) Copper nitrate is dissolved in 1L of triple distilled water, so that the concentration of copper nitrate is 0.2mol / L;

[0024] (2) Add 5mol magnesium nitrate;

[0025] (3) adding 133.7g mass concentration is 30% silica sol;

[0026] (4) Add 2.56g B 2 o 3 as an auxiliary agent;

[0027] (5) Add ammonia water to adjust pH = 10, mix at room temperature for 5 hours, age in a water bath at 95°C for 3 hours, dry, grind, and roast at 450°C for 3 hours to obtain a copper-based catalyst for hydrogenation of acetate to produce ethanol . Among them, MgO-SiO 2 Medium MgO and SiO 2 The mass ratio is 5:1, the mass of Cu in CuO accounts for 5% of the mass of the copper-based catalyst, and the mass of the additive accounts for 1% of the mass of the copper-based catalyst.

Embodiment 2

[0029] A kind of preparation method of the copper-based catalyst that hydrogenates acetate to prepare ethanol comprises the steps:

[0030] (1) Copper acetate is dissolved in 1L of triple distilled water so that the concentration of copper acetate is 0.2mol / L;

[0031] (2) Add 0.75mol magnesium acetate;

[0032] (3) adding 5g mass concentration is 30% silica sol;

[0033] (4) Add 1.37g of auxiliary agent, the auxiliary agent is La with a mass ratio of 1:1 2 o 3 and ZnO;

[0034] (5) Add ammonia water to adjust pH = 11, mix at room temperature for 2 hours, age in a water bath at 80°C for 4 hours, dry, grind, and roast at 550°C for 4 hours to obtain a copper-based catalyst for hydrogenation of acetate to produce ethanol . Among them, MgO-SiO 2 Medium MgO and SiO 2 The mass ratio is 20:1, the mass of Cu in CuO accounts for 28% of the mass of the copper-based catalyst, and the mass of the auxiliary agent accounts for 3% of the mass of the copper-based catalyst.

Embodiment 3

[0036] A kind of preparation method of the copper-based catalyst that hydrogenates acetate to prepare ethanol comprises the steps:

[0037] (1) Dissolve copper chloride in 1L of triple distilled water so that the concentration of copper chloride is 0.2mol / L;

[0038] (2) Add 1.2mol magnesium chloride;

[0039] (3) adding 10.4g mass concentration is 30% silica sol;

[0040] (4) Add 1.28g of auxiliary agent, the auxiliary agent is Nb with a mass ratio of 1:1:1 2 o 5 , CaO and BaO;

[0041] (5) Add ammonia water to adjust pH = 11, mix at room temperature for 3 hours, age in a water bath at 95°C for 5 hours, dry, grind, and roast at 480°C for 5 hours to obtain a copper-based catalyst for hydrogenation of acetate to produce ethanol . Among them, MgO-SiO 2 Medium MgO and SiO 2 The mass ratio is 15:1, the mass of Cu in CuO accounts for 20% of the mass of the copper-based catalyst, and the mass of the auxiliary agent accounts for 2% of the mass of the copper-based catalyst.

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Abstract

The invention discloses a copper-based catalyst for preparing ethanol by acetate hydrogenation and a preparation method. The catalyst is obtained by loading CuO and an auxiliary agent on a composite carrier, wherein the composite carrier is at least one of MgO-SiO2 and TiO2-SiO2; the mass ratio of MgO to SiO2 in the MgO-SiO2 ranges from (5:1) to (20:1), and the mass ratio of TiO2 to SiO2 in the TiO2-SiO2 ranges from (5:1) to (20:1); the mass of Cu in the CuO accounts for 5%-28% of the mass of the copper-based catalyst; and the mass of the auxiliary agent accounts for 1%-3% of the mass of the copper-based catalyst. The reaction activity of the catalyst is high when the catalyst is used for catalyzing acetate hydrogenation ethanol synthesis reaction; the conversion rate of acetate is more than 85%; the product selectivity is good and few byproducts are generated; the ethanol selectivity is up to 99%; and the catalyst can be simply regenerated after the reaction. The preparation method is simple and easy to operate, and has low cost.

Description

technical field [0001] The invention relates to a catalyst for synthesizing ethanol by hydrogenation of acetate and a preparation method thereof. Background technique [0002] With the global energy shortage and rising oil prices, the application prospect of fuel ethanol as a petroleum additive is widely optimistic. In 2011, my country's fuel ethanol consumption was 1.8 million tons. According to relevant national plans, my country's fuel ethanol consumption will reach 10 million tons in 2020. In addition, my country's chemical industry consumes about 3 million tons of industrial-grade ethanol every year. The annual market demand growth rate 8% to 10%, making ethanol in short supply. However, at present, my country has become the largest producer of acetic acid, the consumption structure of acetic acid has not changed significantly, and the output is seriously surplus. The emergence of the ethanol production process by hydrogenation of acetate can replace the traditional ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72C07C31/08C07C29/149
CPCY02P20/584
Inventor 郭翠梨秦宏云张金利孙成伟
Owner TIANJIN UNIV
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