Method for directly converting synthetic gas into low-carbon olefins

A technology for the conversion of synthesis gas and low-carbon olefins, which is applied in the production of hydrocarbons from carbon oxides, organic chemistry, and bulk chemical production. , the difficulty of removing the heat of reaction, etc., to achieve the effect of reducing the thermal effect, long residence time, and short residence time

Active Publication Date: 2011-11-09
CHINA PETROLEUM & CHEM CORP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] From the research status at home and abroad in this field, there are mainly the following problems at present: 1. The product distribution is relatively wide, which is unfavorable to the synthesis of low-carbon olefins with high selectivity; Hydrogen reactions and disproportionation reactions) will lead to increased production of low-value by-products such as alkanes
The amount of catalyst used in some test devices is only 1-2ml, which is equivalent to a differential rea

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Syngas conversion to light olefins using a fixed catalyst method in a high-gravity rotating bed reactor. Using iron-based catalyst (produced by Beijing Research Institute of Chemical Industry), prepared by sol-gel method, the composition is Fe-Mn-K / SiO 2 , where the atomic number ratio of Fe, Mn and K is 100:35:3, and the carrier SiO 2 Accounting for about 40wt% of the total mass of the catalyst, the catalyst is compressed into pellets, placed in the mesh inner part and fixed on the rotor. Before use, pretreatment for 3 hours and then pass the synthesis gas. At a rotation speed of 1600-1800rpm, H 2 / CO is 2, reaction pressure is 1.5MPa, reaction temperature is 310°C, and synthesis gas volume space velocity is 10000h -1 1. React when there are heavy alkanes sprayed and no syngas circulation, the weight ratio of heavy alkanes to syngas is 1, and online sampling and analysis. After 3 hours of reaction, the reaction performance of the catalyst was stable, and the conver...

Embodiment 2

[0030] Syngas is converted to light olefins by spraying catalyst particles on a high gravity rotating bed reactor. Using iron-based catalysts (produced by Beijing Research Institute of Chemical Industry), the catalyst is prepared by co-precipitation method, and the composition is Fe-Mn-K / Al 2 o 3 , the catalyst was spray-dried and calcined to form microspheres, wherein the atomic number ratio of Fe, Mn and K was 100:28:4, and the support Al 2 o 3 Accounting for about 45wt% of the total mass of the catalyst. Before the reaction, suspend the catalyst particles in liquid paraffin, the weight ratio of liquid paraffin to syngas is 2, then pass into the pretreatment reaction unit, and pass into the high-gravity rotary bed reactor after 24 hours of treatment. h 2 The syngas with a / CO of 2 is passed into the high-gravity rotating bed reactor in a countercurrent manner to the liquid paraffin suspended with the catalyst. The rotation speed is 900-1100rpm, the reaction pressure is ...

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Abstract

The invention discloses a method for preparing low-carbon olefins from synthetic gas, and belongs to the field of olefins. In order to solve the problems that due to a backmixing phenomenon, the retention time is inconsistent, reaction products are widely distributed, and side reactions of olefin secondary reaction and water gas reaction and the like are intensified so as to influence the economy of the process in the traditional process for preparing low-carbon olefins from synthetic gas, a rotating packed bed reactor is used as a reactor, a solid Fischer-Tropsch synthesis catalyst is used or a catalyst is prepared into slurry, and the synthetic gas is converted into the low-carbon olefins. By the method, the selectivity of the low-carbon olefins can be greatly improved, and reaction heat can be quickly removed to stabilize the temperature of a reaction bed.

Description

technical field [0001] The present invention relates to a method for preparing low-carbon olefins, more specifically, the present invention relates to a method for preparing low-carbon olefins from synthesis gas. Background technique [0002] Low-carbon olefins, such as ethylene, propylene, and butene, are important chemical raw materials. At present, they mainly come from the steam cracking process of hydrocarbons such as naphtha and low-molecular alkanes such as propane. With the increasing depletion of petroleum resources and rising petroleum prices, the future energy structure will be biased towards coal, natural gas and biomass. Therefore, new ways to synthesize low-carbon olefins from coal, natural gas or biomass have attracted increasing attention. [0003] There are a variety of process routes for the synthesis of low-carbon olefins by using coal, natural gas or biomass, mainly including conversion into synthesis gas and then direct conversion into low-carbon olefins...

Claims

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Application Information

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IPC IPC(8): C07C1/06C07C9/04C07C9/06C07C9/08C07C9/10C07C11/04C07C11/06C07C11/08
CPCY02P20/52
Inventor 黄龙田保亮戴伟唐国旗
Owner CHINA PETROLEUM & CHEM CORP
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