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Method for preparing ethanol by hydrogenating acetic acid

A technology for producing ethanol and acetic acid, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, and preparation of organic compounds. It can solve the problems of small specific surface area and poor catalytic performance of transition metal phosphides, and achieve good catalyst activity and stability. Small impact on the environment, avoiding the effects of post-processing

Inactive Publication Date: 2018-11-09
杨彩花
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small specific surface area of ​​transition metal phosphides, their catalytic performance is poor

Method used

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  • Method for preparing ethanol by hydrogenating acetic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Catalyst preparation

[0029] S1. Weigh a certain amount of carbon nanotubes with an outer diameter of 2nm, and add HNO with a mass fraction of 35% 3 solution and 20ml mass fraction of 15% H 2 o 2 The solution was heated and refluxed at 100°C for 2 to 3 hours, taken out, cooled to room temperature, washed, filtered and dried by conventional methods to obtain surface-modified carbon nanotubes;

[0030] S2. Using the modified carbon nanotubes prepared above as a carrier, Ni(H2PO2)2.6H2O nickel source, Ni(H2PO2)2.6H2O and NaH2PO2.H2O phosphorus source to prepare a supported catalyst. Weigh 10g of porous silica gel, prepare 12mL impregnation solution from 4.0g (1.3478×10-2mol) of Ni(H2PO2)2·6H2O, 1.43g (1.3492×10-2mol) of NaH2PO2·H2O and distilled water, the nickel and phosphorus The concentrations are 1.1232×10-3mol / mL and 3.3707×10-3mol / mL respectively. The volume of the impregnating solution is equal to the volume of the maximum adsorbed water of the catalyst carrier. T...

Embodiment 2

[0032] Catalyst preparation

[0033] S1. Weigh a certain amount of carbon nanotubes with an outer diameter of 2nm, and add HNO with a mass fraction of 35% 3 solution and 20ml mass fraction of 15% H 2 o 2 The solution was heated and refluxed at 100°C for 2 to 3 hours, taken out, cooled to room temperature, washed, suction filtered and dried by conventional methods to obtain surface-modified carbon nanotubes.

[0034] S2. Using the carbon nanotubes prepared above as a carrier, Ni(H2PO2)2.6H2O nickel source, Ni(H2PO2)2.6H2O and NaH2PO2.H2O phosphorus source to prepare a supported catalyst. Weigh 10g of porous silica gel, prepare 36mL impregnation solution from 4.0g (1.3478×10-2mol) of Ni(H2PO2)2·6H2O, 1.43g (1.3492×10-2mol) of NaH2PO2·H2O and distilled water, the nickel and phosphorus The concentrations are 3.7439×10-4mol / mL and 1.1236×10-3mol / mL respectively, the volume of the impregnation solution is three times the maximum volume of water absorbed by the catalyst carrier, a...

Embodiment 3

[0036] Catalyst preparation

[0037] S1. Weigh a certain amount of carbon nanotubes with an outer diameter of 2nm, and add HNO with a mass fraction of 35% 3 solution and 20ml mass fraction of 15% H 2 o 2 The solution was heated and refluxed at 100°C for 2 to 3 hours, taken out, cooled to room temperature, washed, suction filtered and dried by conventional methods to obtain surface-modified carbon nanotubes.

[0038] S2. Using the carbon nanotubes prepared above as a carrier, Ni(H2PO2)2.6H2O nickel source, Ni(H2PO2)2.6H2O and NaH2PO2.H2O phosphorus source to prepare a supported catalyst. Weigh 10g of porous silica gel, prepare 12mL impregnation solution from 4.0g (1.3478×10-2mol) of Ni(H2PO2)2·6H2O, 1.43g (1.3492×10-2mol) of NaH2PO2·H2O and distilled water, the nickel and phosphorus The concentrations are 1.1232×10-3mol / mL and 3.3707×10-3mol / mL respectively. The volume of the impregnating solution is equal to the volume of the maximum adsorbed water of the catalyst carrier. ...

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Abstract

The invention relates to a method for preparing ethanol by hydrogenating acetic acid. A supported transition metal phosphide catalyst takes carbon nanotubes (CNTS) as a carrier, so that the activity and stability of the catalyst are good; a device is stable and long in operation time; the frequent switching operation of reactor reaction and regeneration can be avoided; the conversion rate of the acetic acid is 100%, and the selectivity of the ethanol is 88% or above.

Description

technical field [0001] The invention belongs to the field of fine chemicals, in particular to a method for preparing ethanol by hydrogenating acetic acid. Background technique [0002] Ethanol is a basic industrial raw material and an important organic solvent. It is mainly used in food, chemical industry, military industry, medicine and other fields, and has extensive market demand. Ethanol is also a non-polluting high-octane gasoline additive. In recent years, oil prices have continued to rise and environmental pressure has become increasingly heavy. Countries around the world are seeking for the diversification of energy sources and the development of new alternative energy sources. As one of the emerging renewable green energy sources, ethanol can be added to gasoline in proportion as a vehicle. The use of alternative fuels has been promoted and recognized worldwide. The United States has sold ethanol gasoline for more than 20 years, and 40% of light vehicles in Brazil ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/149B01J27/19B01J27/188B01J27/185
CPCB01J27/1853B01J27/188B01J27/19C07C29/149C07C2527/185C07C2527/188C07C2527/19C07C31/08Y02P20/584
Inventor 杨彩花
Owner 杨彩花
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