Method for preparing low carbon olefin by gas-phase oxidation cracking of hydrocarbon with carbon monoxide as a byproduct

A gas-phase oxidation, carbon monoxide technology, applied in the directions of carbon monoxide, hydrocarbon cracking to produce hydrocarbons, organic chemistry, etc., can solve the problems of affecting the yield of olefins, not attracting enough attention, etc., to improve the conversion rate, reduce the activation energy, and improve the reaction speed. Effect

Inactive Publication Date: 2004-06-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

The naphtha in my country is characterized by a relatively high content of naphthenes, generally around 40%. Under catalytic cracking conditions, naphthenes components are easily dehydrogenated to generate aromatics and affect the yield of olefins.
[0004] In addition, the conventional thermal cracking of hydrocarbons activates hydrocarbon molecules through high temperature. Over the years, abundant research results have been accumulated in thermal cracking, especially in the oxidative dehydrogenation of ethane, propane and butane to olefins. Research work, hoping to reduce the reaction temperature and improve the yield of olefins; the representative research work of ethylene oxidative dehydrogenation was published in Science (1999, volume 285, page 712); At the same time as hydrogen, there is an oxidative cracking effect, but it has not attracted enough attention; the results of the novelty search show that there are no reports at home and abroad on the new process of producing low-carbon olefins and co-producing CO by gas-phase oxidative cracking of hydrocarbons

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this example, n-hexane is used as feed, C / O in the feed gas is 2.4 (molar ratio), the oxygen flow rate is 4.2L / h, and the reaction temperature is controlled at 600-850°C. The reaction results (carbon-containing products) are listed in the table 1.

[0018] reaction

[0019] It can be seen from Table 1 that the CO in the gas-phase oxidative cracking reaction product of n-hexane x Mainly CO (selectivity about 14%), while CO 2 The selectivity is only about 1%; high temperature is conducive to the gas-phase oxidative cracking of n-hexane; n-hexane can obtain a conversion rate of 85% at 750°C, and the combined selectivity of olefins and CO exceeds 70%, and the combined selectivity of olefins and CO The yield can exceed 60%.

Embodiment 2

[0021] In this embodiment, n-hexane is used as feed, the reaction temperature is controlled to be 750°C, the feed gas flow is 7.2L / h (n-hexane flow rate is converted into the gas flow rate under standard conditions), and different C / O ratios (molar ratios) are used. The results (carbon-containing products) are listed in Table 2.

[0022] C / O ratio

[0023] It can be seen from Table 2 that the C / O ratio (molar ratio) mainly affects the conversion rate of n-hexane and the selectivity of CO, but has little influence on the selectivity of other products. The smaller C / O ratio (molar ratio) (2.4) is beneficial to the gas-phase oxidative cracking reaction of n-hexane.

Embodiment 3

[0025] In this example, n-hexane is used as feed material, C / O in the feed gas is 2.4 (molar ratio), the reaction temperature is 750° C., and the feed gas flow rate is 7.2 L / h (the flow rate of n-hexane is converted into the gas flow rate under standard conditions) , inert gas N 2 The content is 0-75%, and the reaction results (carbon-containing products) are listed in Table 3.

[0026]

[0027] It can be seen from Table 3 that with the increase of the amount of nitrogen dilution, the gas phase oxidative cracking conversion rate of n-hexane increases, and the reaction still has excellent reaction performance when air is used instead of oxygen as the oxidant.

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Abstract

A process for preparing lower carbon number hydrocarbons and carbon monoxide through hydrocarbons gas-phase oxidation decomposition, wherein the raw material hydrocarbons are vaporized and mixed with oxygen or air under the temperature of 600-900 deg. C for hydrocarbons oxidation decomposition reaction, the mol ratio of C/O in raw material gas is 1.5-6.0. The invention can substantially lower the activation energy for the process of alkyl group free radical forming through hydrocarbon dehydrogenation, compared with the conventional hydrocarbons thermo-cracking process, the present invention realizes low energy consumption, less discharge, high production capability, low manufacturing cost and reduced investment.

Description

technical field [0001] The invention relates to a method for producing low-carbon olefins by cracking hydrocarbons, and in particular provides a method for producing low-carbon olefins and co-producing carbon monoxide by gas-phase oxidative cracking of hydrocarbons. Background technique [0002] Low-carbon olefins such as ethylene and propylene, as important basic raw materials for petrochemical industry, play a pivotal role in the petrochemical industry; at present, the vast majority of industrial production of low-carbon olefins is from hydrocarbons (mainly naphtha) steam Thermal cracking method; naphtha is one of the important raw materials for the production of ethylene; naphtha is mainly composed of a mixture of hydrocarbons including paraffins and naphthenes; paraffins (including branched and unbranched alkanes) It is the main component in most naphthas in the world. In the process of alkane cracking to olefins, the formation of alkyl radicals is a key step, and the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/40C07C4/02C07C11/02
Inventor 刘雪斌徐恒泳李文钊陈燕馨侯守福
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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