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Method for preparing olefin by dehydrogenating low-carbon alkane

A technology for alkane dehydrogenation and olefin production, which is applied in the field of hydrocarbon dehydrogenation to olefin production, can solve the problems of high cracking temperature, complex components of cracked products, large process energy consumption, etc., and achieves the effect of improving conversion rate and selectivity

Inactive Publication Date: 2012-07-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pyrolysis temperature is high, the energy consumption of the process is high, the composition of the pyrolysis product is complex, and separation and purification are difficult. Therefore, the oxidative dehydrogenation process has received more attention.

Method used

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  • Method for preparing olefin by dehydrogenating low-carbon alkane
  • Method for preparing olefin by dehydrogenating low-carbon alkane
  • Method for preparing olefin by dehydrogenating low-carbon alkane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The raw material nature and source used in the embodiment are listed in Table 1

[0041]

[0042] Catalyst preparation

[0043] 3%Cr / SiO 2 Catalyst preparation

[0044] 0.71 g of Cr(NO 3 ) 3 9H 2 O is dissolved in 2.25 milliliters of water, adding 3 grams of specific surface area is 640m 2 / g of silica impregnated, stirred evenly and placed at room temperature for 24 hours, then dried at 120°C for 2 hours.

[0045] In a static muffle furnace, dry silica loaded with chromium nitrate precursor was calcined in air at 600 °C for 4 hours to obtain 3% Cr / SiO 2 catalyst.

[0046] 3%Cr / SiO 2 -1 Preparation of catalyst

[0047] 0.71 g of Cr(NO 3 ) 3 9H 2 O was dissolved by adding 2.25 ml of water, impregnated by adding 3 g of silicon dioxide, stirred evenly and left at room temperature for 24 hours, then dried at 120°C for 2 hours.

[0048] In a static muffle furnace, the dried silicon dioxide loaded with chromium nitrate precursor was roasted in air in multi-sta...

Embodiment 2

[0068] Load 0.3g catalyst in stainless steel reactor (inner diameter 6mm), catalyst is in N 2 Raise the temperature to 600°C under purging, and then switch to the reaction gas, whose specific composition is 20%C 3 h 8 , 80% CO or CO 2 or N 2 , the above percentages are mole percentages, and the space velocity of the feed stream is 1750h -1 , The reacted product enters the chromatogram for analysis, and after reacting for 6 minutes under normal pressure, record the fresh yield of propylene. The results of the analysis are listed in Table 2.

[0069] Table 2C 3 h 8 Respectively and CO, CO 2 , N 2 Reaction results on catalysts with different Cr loadings

[0070]

[0071] It can be seen from Table 2 that propane reacts in different gas atmospheres, and the promotion effect of carbon monoxide on propane dehydrogenation reaction is greater than that of carbon dioxide and nitrogen; Propylene selectivity.

Embodiment 3

[0072] Example 3 The reaction results of multi-stage heating and roasting catalyst in air atmosphere

[0073] In addition to changing the catalyst to 3% Cr / SiO 2 -1 catalyst, carry out propane dehydrogenation reaction in the same manner as in Example 2. The results are shown in Table 3.

[0074] Table 3C 3 h 8 Respectively and CO, CO 2 , N 2 In Catalyst 3%Cr / SiO 2 The result of the reaction on -1

[0075]

[0076] From the comparison of Table 3 and Table 2, it can be seen that the catalyst prepared by multi-stage heating is better than the catalyst in Example 1 in terms of propane conversion and propylene selectivity.

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Abstract

The invention discloses a method for preparing olefin by dehydrogenating low-carbon hydrocarbons. A hydrogen product is consumed by using reaction of hydrogen and carbon monoxide to break through the balance of the reaction, and the reaction tends to the dehydrogenation direction, so that the balance conversion rate of the low-carbon hydrocarbons and the selectivity of the corresponding olefin are improved.

Description

technical field [0001] The invention relates to a new method for dehydrogenating hydrocarbons to olefins in a carbon monoxide atmosphere. Background technique [0002] Ethylene is the most important basic raw material in petrochemical industry. It is mainly used to produce polymers such as polyethylene and polyvinyl chloride, as well as organic chemical raw materials such as ethylene oxide and ethylene glycol. Currently, about 75% of petrochemical products are made of ethylene. to produce. At present, the industrial production of ethylene is mainly prepared by steam cracking of hydrocarbons. The reaction conditions of this method are harsh and the investment is large. During the reaction, coke is formed and deposited on the furnace tube wall. The reaction selectivity is poor, and the coke must be cleaned regularly. [0003] In order to make full use of ethane resources, some progress has been made in recent years in the research on the new process of oxidative dehydrogenati...

Claims

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Application Information

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IPC IPC(8): C07C5/333C07C11/06C07C11/04
CPCC07C5/42
Inventor 李利娜刘中民朱文良刘洪超刘勇孟霜鹤刘世平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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