Method for producing biological ethylene by using solid-carrying dodecatungsten rare earth polyoxometallate

A technology of heteropoly acid salt and bio-ethylene, which is applied in the production of bulk chemicals, chemical instruments and methods, chemical/physical processes, etc., to achieve the effects of high reaction selectivity, excellent bioactivity and stability

Inactive Publication Date: 2008-02-20
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rare earth ions can be Ce 2+ 、Sm 2+ , Yb 3+ 、Gd 3+ and Nd 2+ Wait

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]Activated carbon is crushed into 3nm granular and sieved, take 15mL-20mL of concentrated nitric acid (2-8mol / L) solution, add 5-10g of activated carbon, and keep boiling for 30min. Leave it for about 4 hours, rinse with distilled water close to neutral. Dip with 0.1-0.5mol / L alkali (salt) for 24 hours, and then use a large amount of distilled water to wash until neutral. After drying in a crucible furnace at 300°C for 4 hours, put it in a desiccator for use. Dissolve 1-10g of rare earth heteropolyacid salt in 100-200mL ethanol to prepare 0.001~0.002mol / L rare earth heteropolyacid ethanol solution. Add 5-10 g of activated carbon carrier into the ethanol solution of rare earth heteropoly acid prepared above, and soak for 24 hours. Ethanol was slowly evaporated at 50-80°C, and dried in an oven at 150°C for 4 hours. Rare Earth Heteropolyacid Salt SmHSiW Immobilized on Activated Carbon 12 o 40 .13H 2 The catalyst of O is prepared according to the molar ratio of rare ear...

Embodiment 2

[0032] Take 10 g of 4 Å molecular sieves in NH 4 Cl and NH 4 NO 3 Soak in the solution for 24h, and then put it in a crucible and bake at 300°C for 4h. After taking it out, lower it to room temperature and put it in a desiccator for later use. 1 g of YbSiW 12 o 40 13H 2 O dissolved in ethanol solution to make YbSiW 12 o 40 .13H 2 O ethanol solution, add roasted 4 Å molecular sieves for immersion for 24 hours, then dry in an oven at 70°C for 4 hours to evaporate the ethanol. Then put it into a crucible furnace and bake it at 270°C for 4h to prepare the rare earth heteropolyacid salt YbSiW supported by 4 Å molecular sieve 12 o 40 13H 2 O. Loaded in a tubular reactor, under normal pressure and 170°C, the space velocity of ethanol water vapor is controlled at 40 / hour, enters the reactor, and reacts for 10-15 minutes. The space-time yield of ethylene is 84.6%, and the content of ether is 0.2%. .

Embodiment 3

[0034] Take 12g of commercially available γ-alumina and put it in a crucible and bake it at 300°C for 4h, then cool it down to room temperature and put it in a desiccator for use. 3g rare earth heteropoly salt GdSiW 12 o 40 13H 2 O was dissolved in ethanol to make a 0.002mol / L rare earth heteropolyacid ethanol solution. Add 8g of alumina carrier into the ethanol solution prepared above, and soak for 24h. Ethanol was slowly evaporated in an oven at 58°C, then put into a crucible and roasted at 250°C for 4 hours, and put into a desiccator for use. Rare earth heteropolyacid salt GdSiW immobilized on γ-alumina 12 o 40 13H 2 O, under normal pressure and 190°C, the ethanol water vapor space velocity is controlled at 50 / hour, enters the reactor, and reacts for 10-15 minutes. The space-time yield of ethylene is 74.3%, and the ether content is 3.4%.

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Abstract

The invention relates to a method for preparing biological ethylene by the use of catalytic action and dehydration of rare-earth lauryl heteropoly tungstic acid salt. The main technology process is that: the ethanol solution of rare-earth lauryl heteropoly tungstic acid salt is solid supported by the process of being leached and adsorbed by carriers such as active carbon or molecular sieve or Gamma-alumina, etc, being dried and baked, etc., and then is loaded in a tubular reactor and reacts under normal pressure, at 150 DEG C to 190 DEG C for 10 minutes with airspeed of the ethanol vapor being controlled from 30 to 50 per hour. The space time yield of ethylene is 88.3 percent and no aether is detected in the result. The invention provides the method for preparing biological ethylene, and reaction temperature is 150 DEG C to 250 DEG C lower than that of conventional oxide catalyst and 60 DEG C to 100 DEG C lower than that of molecular sieve catalyst. Furthermore, space time yield increases by 10 percent to 30 percent, reaction selectivity is greatly high and almost no aether is founded. The catalyst has excellent nature and stability.

Description

technical field [0001] The invention relates to a production method of bio-ethylene, in particular to a method for producing bio-ethylene by catalyzing dehydration of bio-ethanol by using a rare earth heteropolyacid salt after immobilization. Background technique [0002] Ethylene is a major basic organic chemical raw material. The scale and level of the ethylene industry reflect an important symbol of the development level of a country's chemical industry. At present, the production method of ethylene mainly adopts petroleum catalytic cracking. The cost of ethanol catalytic dehydration is 15% higher than that of petroleum catalytic cracking, but due to the depletion of global energy and resources, the former has received more and more attention. Ethanol can be produced from biomass or any carbon resource. With the development of bioengineering technology, the cost of raw materials will undoubtedly be greatly reduced, and biomass resources are inexhaustible and can be used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C1/24B01J27/188B01J23/10B01J23/30
CPCY02P20/52
Inventor 龚大春田毅红曾晶李德莹
Owner CHINA THREE GORGES UNIV
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