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Method for preparing high-efficient catalyst suitable for preparing ethylene by ethanol dehydration

A technology of ethanol dehydration and catalyst, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of few industrial application reports of molecular sieve catalysts, and achieve long life, low temperature and high catalytic selectivity Effect

Inactive Publication Date: 2009-06-17
FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the industrial application of molecular sieve catalysts, only the industrial application reports on catalytic dehydration of molecular sieves in Sichuan Vinylon Plant of Sinopec

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Take 100mL of H3PO4 with a mass fraction of 3.7% and place it in a flask equipped with a thermometer and a stirrer, add 0.5 grams of ammonium metavanadate powder, stir to make it fully dissolve and mix, then add HZSM-550 grams of Si / Al=25, Stir at room temperature for 3 h for surface loading reaction. After the reaction is finished, the temperature is controlled to dry at 110° C., and the catalyst is roasted at 320° C. for 3 hours to obtain the catalyst suitable for ethanol dehydration to ethylene according to the present invention.

[0012] Using the catalyst prepared in this example, the conversion rate of ethanol in the fluidized bed reactor reaches 97.9%, and the selectivity of ethylene reaches 96.8%.

Embodiment 2

[0014] Take 100mL of H3PO4 with a mass fraction of 3.7% and place it in a flask equipped with a thermometer and a stirrer, add 0.5 grams of ammonium metavanadate powder, stir to make it fully dissolve and mix, then add HZSM-550 grams of Si / Al=25, Stir at room temperature for 3.5h for surface loading reaction. After the reaction is finished, dry at 150° C., and bake at 260° C. for 3 hours to obtain the catalyst suitable for ethanol dehydration to ethylene according to the present invention.

[0015] Using the catalyst prepared in this example, the conversion rate of ethanol in the fluidized bed reactor reaches 96.9%, and the selectivity of ethylene reaches 97.2%.

Embodiment 3

[0017] Take 100mL of H3PO4 with a mass fraction of 3.7% and place it in a flask equipped with a thermometer and a stirrer, add 0.5 grams of ammonium metavanadate powder, stir to make it fully dissolve and mix, then add HZSM-550 grams of Si / Al=25, Stir at room temperature for 4 h for surface loading reaction. After the reaction is finished, control the temperature of 130° C. for drying, and bake at 300° C. for 3 hours to obtain the catalyst suitable for the dehydration of ethanol to produce ethylene according to the present invention.

[0018] Using the catalyst prepared in this example, the conversion rate of ethanol in the fluidized bed reactor reaches 98.3%, and the selectivity of ethylene reaches 96.7%.

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Abstract

The invention relates to a catalyst preparation method suitable for ethylene preparation via ethanol dehydration, in particular to a high efficiency catalyst preparation method via low concentration ethanol fluidized bed dehydration to prepare ethylene. The invention is characterized in that ammoniumammonium metavanadateis added to H3PO4 with 3.7 percent of mass ration to keep the atomicity ratio of phosphorus and vanadium at 7.5; then HZSM-5 is added in and the solution is stirred for 3 to 4 hours in room temperature to load the surface of HZSM-5 with vanadium and phosphorus. The reactant is dried in temperature from 110 degrees to 150 degrees centigrade and is roasted for 3 hours in temperature from 260 degrees to 380 degrees centigrade before the catalyst product is yielded. When the catalyst of the invention is applied in fluidized bed reactor, liquid ethanol is vaporized at the bottom of the reactor and enters catalyst layer, with the transformation rate of ethanol in the reactor as high as 96.9 percent and the selectivity of ethylene as high as 96.5 percent. In the reaction procedure, the temperature is low, the catalysis selectivity is high and the service life is long.

Description

technical field [0001] The invention relates to a catalyst preparation method suitable for ethanol dehydration to prepare ethylene, in particular to a high-efficiency catalyst preparation method for low-concentration ethanol fluidized bed dehydration to prepare ethylene. Background technique [0002] Before the First World War, fixed bed ethanol dehydration to ethylene process was developed in Europe and industrialized in many countries. With the maturity of the process technology for producing ethylene by thermal cracking of hydrocarbons such as oil and natural gas, thermal cracking of hydrocarbons will soon replace the process of ethanol dehydration. In recent years, the oil price in the international market has continued to rise, and since 2006, the oil price in the international market has repeatedly set new historical records, surpassing the high limit of 80 US dollars per barrel many times. With the sharp increase in crude oil prices, the production cost of cracking e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/48B01J29/85C07C11/04C07C1/24
CPCY02P20/52
Inventor 陈庆华洪爱珠颜桂炀刘欣萍肖荔人
Owner FUJIAN NORMAL UNIV
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