Method for preparing ethanol by acetic acid gas phase hydrogenation

A technology for hydrogen production and acetic acid, which is applied in the field of ethanol production by gas-phase hydrogenation of acetic acid, which can solve the problems of low ethanol product selectivity, high reaction pressure and energy consumption, and achieve the effect of reducing reaction pressure and energy consumption and improving selectivity

Active Publication Date: 2012-09-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

But above-mentioned technical reaction pressure and energy consumption are high, and the selectivity of ethanol product is low

Method used

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  • Method for preparing ethanol by acetic acid gas phase hydrogenation

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Comparison scheme
Effect test

Embodiment 1

[0019] The catalyst used is Pd-Re-Au / activated carbon. The weight composition of the catalyst is: Pd=1.5%, Re=5%, Au=2%, and the rest is carrier activated carbon. The carrier is commercial coconut shell carbon, and the catalyst active component Pd and additives Re and Au are loaded on the carrier activated carbon (the particle size of the activated carbon is 20-40 mesh) by conventional impregnation method. 6.8 grams (about 10ml) of the catalyst were activated by hydrogen before the reaction, the activation conditions were: GHSV=1000h -1 , Atmospheric pressure, 300°C, reduction time 5 hours. Choose a fixed bed reactor. The reaction temperature is 240°C, the hydrogen pressure is 8.0MPa, and the H 2 / acetic acid (refined acetic acid) molar ratio is 20 acetic acid liquid space velocity is 0.5h -1 , the reaction time is 50h, sampling analysis. The gas phase effluent was analyzed by gas chromatography, Porapark Q packed column, TCD detector; the liquid product sample was analyz...

Embodiment 2

[0021] The liquid space velocity of acetic acid is 0.3h -1 , other conditions are identical with embodiment 1.

Embodiment 3

[0023] The liquid space velocity of acetic acid is 0.9h -1 , other conditions are identical with embodiment 1.

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Abstract

The invention discloses a method for preparing ethanol by acetic acid gas phase hydrogenation. The method is characterized in that a reaction system comprises acetic acid, hydrogen and a catalyst; a reaction temperature is in a range of 120 to 300 DEG C; reaction pressure is in a range of 1.0 to 20.0MPa; an airspeed of an acetic acid liquid is in a range of 0.5 to 10.5h<-1>; a mole ratio of H2 to acetic acid is in a range of 1-250; the catalyst utilizes active carbon as a carrier and contains precious metal Pd and/or Pt as a main active ingredient; and one or more auxiliary agents are selected from Au, Ag, Fe, Re, Cu, Ru and their oxides. Through the catalyst, high activity and high selectivity transformation of an acetic acid and hydrogen into ethanol is realized.

Description

technical field [0001] The invention relates to a method for preparing ethanol by gas-phase hydrogenation of acetic acid, in particular a method for generating ethanol by gas-phase hydrogenation of acetic acid as a raw material. technical background [0002] Ethanol is an important solvent and chemical raw material, and it is also an ideal high-octane non-polluting vehicle fuel and its additives. Brazil has been using ethanol as vehicle fuel or fuel additive for many years. In recent years, my country has implemented the promotion of ethanol gasoline in many provinces, and the effect is obvious. With the improvement of environmental quality requirements, the development of alcohol fuel and the addition of alcohol or ether in gasoline have become the main way to improve automobile fuel. my country has a large population but insufficient arable land. Generally speaking, food is not abundant, and oil resources are relatively insufficient, while coal resources are relatively ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/141B01J23/52B01J23/50B01J23/89B01J23/656B01J23/46B01J37/18
Inventor 丁云杰严丽王涛马立新
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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