Molybdenum vanadium tellurium niobium oxygen catalyst for ethane to ethylene, preparation method and application thereof

A catalyst and ethane production technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of reducing ethylene selectivity, increasing the difficulty of product separation, and low ethane conversion rate, etc., to achieve reaction The effect of stable performance

Active Publication Date: 2017-10-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0004] 2. The composition of the product is complex
The cracking reaction is a complex free radical reaction, and there are many kinds of products produced. On the one hand, it will reduce the selectivity of ethylene (ethylene is generally not more than 80%), that is, to reduce the utilization rate of raw materials, and on the other hand, it will also increase the separation difficulty of products (especially is to produce H with a low boiling point 2 and methane)
[0005] 3. Regular removal of carbon deposits is required
The high temperature reaction will cause carbon deposits on the pipe wall, and it is necessary to stop the car regularly to remove the carbon deposits, which will inevitably affect the production efficiency
[0006] 4. High equipment investment
However, under this condition, due to the low space velocity, the space-time yield of ethylene is low, which is far from meeting the needs of ethylene industrial production; and at a high space velocity, although the selectivity of ethylene is high (some catalysts can reach 96% ), the conversion rate of ethane is too low (usually less than 40%), which will also cause the lower space-time yield of ethylene

Method used

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  • Molybdenum vanadium tellurium niobium oxygen catalyst for ethane to ethylene, preparation method and application thereof
  • Molybdenum vanadium tellurium niobium oxygen catalyst for ethane to ethylene, preparation method and application thereof
  • Molybdenum vanadium tellurium niobium oxygen catalyst for ethane to ethylene, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The Mo-V-Te-Nb-O catalyst was prepared by the temperature-programmed hydrothermal synthesis method. First, weigh the proportions of ammonium molybdate, vanadyl sulfate, telluric acid and niobium oxalate and dissolve them in hot deionized water. After heating each for 30-60 minutes, slowly mix the solutions together and continue stirring for 10-30 minutes. Minutes later, add a certain amount of surfactant CTAB (the ratio of substance is CTAB / Mo=0.04), continue to stir for 3-10 minutes, then transfer it to the special stainless steel tube synthesis kettle described in patent CN101612564 to The temperature rise rate of 10°C / min was increased from room temperature to 180°C, and after keeping it for 20 hours, it was naturally cooled to room temperature, and then taken out, filtered and dried. Grind the obtained black solid and place it in a roasting vessel, raise it from room temperature to 300°C at a heating rate of 3°C / min and keep it for 2 hours (atmosphere is air), then r...

Embodiment 2

[0036] The catalyst preparation procedure in this example is as described in Example 1, except that no surfactant is added during synthesis.

[0037] Take 1g of 20-30 mesh catalyst for the selective oxidation reaction of ethane, and the reaction conditions are the same as in Example 1. The result of the reaction is: the conversion of ethane is 40.5%, and the selectivity of ethylene is 95.0%. The results of the reaction are listed in Table 1.

Embodiment 3

[0039] The catalyst preparation procedure in this example is as described in Example 1, except that the reaction temperature in the reactor during synthesis is 160° C., and the holding time is 2 h.

[0040] Take 1g of 20-30 mesh catalyst for the selective oxidation reaction of ethane, and the reaction conditions are the same as in Example 1. The result of the reaction is: the conversion rate of ethane is 20.8%, and the selectivity of ethylene is 89.0%. The reaction results are listed in Table 1.

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Abstract

The molybdenum vanadium tellurium niobium oxide catalyst used for preparing ethylene from ethane, its preparation method and application belong to the ethylene preparation technology of organic chemical industry. The elemental composition of the catalyst is Mo‑V‑Te‑Nb‑O, and the molar ratio of its active components is Mo:V:Te:Nb=1:0.2~1.0:0.2~1.0:0.1~0.5. The stainless steel reaction kettle is prepared by hydrothermal synthesis method, and special surfactant is added for adjustment during the preparation process, and the obtained catalyst is obtained by further roasting. When it is used in the ethane oxidation to ethylene reaction, the ethane conversion rate and ethylene selectivity can reach 70.5% and 95.0% respectively at 350 °C, and the ethylene yield can reach 67.0%, far exceeding the results reported in the literature.

Description

Technical field [0001] The invention relates to an organic chemical ethylene preparation technology, and in particular provides a molybdenum vanadium tellurium niobium oxygen catalyst for preparing ethylene from ethane, and a preparation method and application thereof. Background technique [0002] Ethylene is the basic raw material of petrochemical industry and the pillar industry of the national economy. At present, 75% of petrochemical products are produced by ethylene; ethylene output has become an important indicator of the level of a country's petrochemical industry. As of the end of 2013, the annual production capacity of ethylene in my country was 19.256 million tons, and the output is expected to reach 16 million tons. According to the National Twelfth Five-Year Plan for the Ethylene Industry, my country’s total ethylene production capacity will reach 27 million tons by 2015. According to preliminary estimates, the annual output will reach 25 million tons. Therefore, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057C07C5/48C07C11/04
CPCY02P20/52
Inventor 杨维慎王红心楚文玲
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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