Method for preparing ethanol through acetic ester hydrogenation

A technology for hydrogenation of acetate and production of ethanol, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve problems that have not yet been applied on a large scale, poor catalyst stability, harsh process conditions, etc., and achieve high heat Stability and hydrogenation activity and effects of stability, enhanced thermal stability, and improved anti-sintering ability

Active Publication Date: 2013-03-20
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the disadvantages of harsh process conditions, poor catalyst stability, and low selectivity, it has not been widely used so far.
[0005] Chinese patent CN101934228A reports a copper-based catalyst for the hydrogenation of acetate to ethanol, the carrier is alumina or silicon oxide, and the additives are oxides of zinc, manganese, chromium, calcium, barium, iron, nickel, magnesium and other elements. Among them, the conversion rate of acetate is up to 88%, and the reaction efficiency is low.

Method used

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  • Method for preparing ethanol through acetic ester hydrogenation
  • Method for preparing ethanol through acetic ester hydrogenation
  • Method for preparing ethanol through acetic ester hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Catalyst preparation

[0054] Weigh 11 g of CTAB (cetyltrimethylammonium bromide) and place it in a beaker of 270 g of water and fully dissolve it, add 51.4 g of TEOS (tetraethyl silicate); then add 2.2 g of NaOH to make The pH value is between 11-11.5; raise the temperature of the water bath to 80°C and stir for 2 h to form the mother liquor of MCM-41 molecular sieve; weigh 15.2g Cu(NO 3 ) 2 ·3H 2 O and 51.7ml of 25% ammonia water were added to 150ml of water to form a cuproammonia solution; at room temperature, the cuproammonia solution was poured into the mother liquor of MCM-41 molecular sieves and stirred for 4h; weighed 0.53g La(NO 3 ) 3 ·6H 2 Add O into the slurry; then raise the temperature of the water bath to 80°C to volatilize the ammonia gas, stop heating when the pH value is lower than 7; then put the slurry into a stainless steel crystallization kettle and crystallize at 120°C 24 hours; after the crystallization was completed, take it out and cool, fi...

Embodiment 2

[0058] Catalyst preparation

[0059] Weigh 11 g of CTAB and place it in a beaker of 270 g of water and fully dissolve it, add 59.4 g of TEOS; then add 2.2 g of NaOH to make the pH value between 11-11.5; increase the temperature of the water bath to 80 ° C and stir for 2 h forms the mother liquor of MCM-41 molecular sieve; Weigh 7.6g Cu(NO 3 ) 2 ·3H 2 O and 25.8ml of 25% ammonia water were added into 150ml water to form a cuproammonia solution; at room temperature, the cuproammonia solution was poured into the mother liquor of MCM-41 molecular sieves and stirred for 4h; weighed 1.06g La(NO 3 ) 3 ·6H 2 O was added to the slurry; then the water bath was heated to 80°C to volatilize the ammonia gas, and the heating was stopped when the pH value was lower than 7; then the slurry was put into a stainless steel crystallization kettle and crystallized at 120°C for 24 hours; after the crystallization is completed, take it out and cool it, filter it, and wash it until neutral; then...

Embodiment 3

[0063] Catalyst preparation

[0064] Weigh 11 g of CTAB, place it in a beaker of 270 g of water and fully dissolve it, add 40 g of TEOS; then add 2.2 g of NaOH to make the pH value between 11-11.5; increase the temperature of the water bath to 80 °C and stir for 2 h Form the mother liquor of MCM-41 molecular sieve; Weigh 22.8g Cu(NO 3 ) 2 ·3H 2 O and 77.5ml of 25% ammonia water were added to 150ml of water to form a cuproammonia solution; at room temperature, the cuproammonia solution was poured into the mother liquor of MCM-41 molecular sieves and stirred for 4 h; weighed 2.7g La(NO 3 ) 3 ·6H 2 O was added to the slurry; then the water bath was heated to 80°C to volatilize the ammonia gas, and the heating was stopped when the pH value was lower than 7; then the slurry was put into a stainless steel crystallization kettle and crystallized at 120°C for 24 hours; after the crystallization is completed, take it out and cool it, filter it, and wash it to neutrality; then dry ...

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Abstract

The invention relates to a method for preparing ethanol through acetic ester hydrogenation. The method performs an acetic ester hydrogenation reaction to generate ethanol under the conditions of certain temperature, pressure, hydrogen / ester molar ratio and hydrogen circulation in a fixed-bed reactor filled with a copper-based catalyst, wherein in the copper-based catalyst, a mesoporous molecular sieve MCM-41 is used as a carrier, copper is used as an active component, and the oxide of at least one element of La and Ce is used as an auxiliary; and the MCM-41 accounts for 40-90% of the catalyst by weight, the active component copper accounts for 10-50% of the catalyst by weight, and the auxiliary accounts for 0.1-20% of the catalyst by weight. According to the method for preparing ethanol through acetic ester hydrogenation, provided by the invention, when the reaction temperature is 220 DEG C, the reaction pressure is 3MPa, the hydrogen / ester molar ratio is 30 and the mass airspeed of acetic ester is 2h<-1>, the conversion rate of acetic ester is 98.5%, and the ethanol selectivity is as high as 99.6%, thereby showing extremely high hydrogenation activity, selectivity and stability.

Description

technical field [0001] The invention relates to a method for preparing ethanol through hydrogenation of acetate. Background technique [0002] Ethanol, commonly known as alcohol, as an important chemical raw material, is widely used in food, medicine, chemical industry, national defense and other fields. Since the oxygen content of ethanol is as high as 34.7%, it can also be added to gasoline as a substitute for methyl tert-butyl ether (MTBE) to obtain ethanol gasoline. While reducing gasoline consumption, it can also make gasoline burn more fully, thereby reducing combustion emissions of pollutants such as CO. [0003] Mature ethanol production technologies mainly include two routes. One is the petroleum route that uses ethylene, a product of petroleum cracking, as raw material, and obtains ethanol through hydration. Another route refers to the biological fermentation method that uses various sugar-containing agricultural products, agricultural and forestry by-products a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149B01J29/76
Inventor 吕静赵玉军马新宾曹新原王胜平王保伟李振花徐艳
Owner TIANJIN UNIV
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