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Device and method for preparing ethylene from ethane oxidative dehydrogenation

A technology for oxidative dehydrogenation and ethane, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve problems such as the inability to adjust gas components, achieve good universality, extend service life, and expand applications effect of space

Inactive Publication Date: 2014-07-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this distribution is mainly determined by the initial O 2 Concentration and the nature of the membrane, arbitrary gas composition adjustment at multiple points in the catalyst bed cannot be achieved
[0009] In summary, although great efforts have been made to improve the oxidative dehydrogenation process of alkanes, there is still a lack of regulation of the flow rate ratio of oxygen and alkane in the ODH reaction of alkanes in a single catalyst bed in a fixed-bed reactor. technology and related

Method used

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  • Device and method for preparing ethylene from ethane oxidative dehydrogenation
  • Device and method for preparing ethylene from ethane oxidative dehydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0041] like figure 1 As shown in the device for producing ethylene by oxidative dehydrogenation of ethane, the inner diameter of the main reaction tube 1 is 12 mm, the length is 50 cm, and the inside is circular; the first branch pipe 4, the second branch pipe 5, the third branch pipe 6 and the fourth branch pipe 7 Four connection points with the main pipeline divide the catalyst bed 25 into five equal parts; wherein the inert gas source 10 provides 2 A mixture of 9.8% He gas and 90.2% He gas.

[0042] The method for producing ethylene by oxidative dehydrogenation of ethane, adopts the above-mentioned device for producing ethylene by oxidative dehydrogenation of ethane, comprising the following steps:

[0043] Step 1, filling the catalyst; the specific method is:

[0044] The catalyst is a mixture, and the first part is a Ni catalyst supported by Y-type molecular sieve. The specific preparation method can be found in the literature [X.Lin, et al., Journal of Catalysis265(200...

Embodiment 2

[0055] The difference from Example 1 is:

[0056] Step 2. Control F(O 2 ) 0 =7.1mL·min -1 , then F(O 2 ) 0 / F(C 2 h 6 ) 0 is 0.70;

[0057] Step three, the oxygen flow rate in four branch pipes are respectively: F(O 2 ) 0,i =0.6mL·min -1 , F(O 2 ) 0,ii =0.6mL·min -1 , F(O 2 ) 0,iii =0.4mL·min -1 and F(O 2 ) 0,iv =0.4mL·min -1 .

[0058] When the gas flow rate of all pipelines and the temperature of the catalyst bed 25 reach the set value, the device is adjusted and starts continuous production.

[0059] In order to verify the effect of this embodiment, this example uses a gas chromatograph to quantitatively analyze the composition of the product gas 14 of the above-mentioned step 2 and the product gas 14 of the step 3; the ethylene yield Y of the step 2 is calculated 1 %=14.3%, the ethylene yield Y of step three 2 %=23.1%; the latter is 8.8% higher than the former.

[0060] The contrast of this example and embodiment one also can find out, under the situ...

Embodiment 3

[0062] The difference from Example 1 is:

[0063] Step 1, the catalyst composition is changed from Ni / Y in example 1 to Ni(NO 3 ) 2 Ni / Al Prepared by Solution Impregnation 2 o 3 catalyst.

[0064] When the gas flow rate of all pipelines and the temperature of the catalyst bed 25 reach the set value, the device is adjusted and starts continuous production.

[0065] In order to verify the effect of this embodiment, this example uses a gas chromatograph to quantitatively analyze the composition of the product gas 14 of the above-mentioned step 2 and the product gas 14 of the step 3; the ethylene yield Y of the step 2 is calculated 1 %=10.6%, the ethylene yield Y of step three 2 %=15.1%; the latter is 4.5% higher than the former.

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Abstract

The invention belongs to the field of petrochemical production, and particular relates to a device and a method for preparing ethylene from ethane oxidative dehydrogenation. The device for preparing the ethylene from the ethane oxidative dehydrogenation comprises a main reaction tube; the side surface of the main reaction tube is provided with 1-8 branch pipe(s); the main reaction tube is filled with a catalyst, so that a catalyst bed layer can be formed; outlets of all the branch pipes are covered by the side surface of the catalyst bed layer; an oxygen source, an ethane gas source and an inert gas source are combined into one path and flow into a gas inlet hole of the main reaction tube; the oxygen source and the ethane gas source are combined into one path and flow into the plurality of branch pipes after respectively passing through an oxygen branch pipe stop valve and an ethane branch pipe stop valve. The method for preparing the ethylene from the ethane oxidative dehydrogenation comprises the steps of filling the catalyst and controlling technological parameters of the main tube and the branch pipes. According to the device and the method, a plurality of nodes can be provided for adjusting the flow velocity ratio of oxygen to ethane in the catalyst bed layer, so that the yield of the ethylene is obviously increased and reaches up to 18%; furthermore, the carbonization rate of the catalyst is reduced, and the service cycle of the catalyst is prolonged.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a device and method for producing ethylene by oxidative dehydrogenation of ethane, and ethylene is produced by using the device and method. Background technique [0002] Small molecular olefins, especially ethylene (C 2 h 4 ), is the basic raw material for the production of many chemical products. With oxygen (O 2 ) and ethane (C 2 h 6 ) to produce ethylene by oxidative dehydrogenation of ethane (ODHE) as raw material has some obvious advantages and good application prospects compared with the current industrial production method. Although this method has not yet been industrialized, its potential huge economic value still stimulates people to invest in it. A core problem to be solved urgently in the production of ethylene by ODHE is how to make the whole catalytic reaction system (reaction pipeline + catalyst) give high ethane conversion rate and ethylene ...

Claims

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Application Information

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IPC IPC(8): B01J8/06C07C11/04C07C5/48
CPCY02P20/52
Inventor 林旭锋席燕燕鲁晓明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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