Separation method of reaction gas generated in making alkenes from methanol

A separation method and reaction gas technology, applied in the purification/separation of hydrocarbons, chemical instruments and methods, chemical change purification/separation, etc., can solve the comprehensive consideration of MTO reaction gas separation, and achieve the effect of preventing acid corrosion

Active Publication Date: 2013-09-25
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0013] It is not difficult to see from the above description that the above published patents only focus on individual aspects of the separation of MTO reaction gas, neither comprehensively consider the separation of MTO reaction gas, nor combine MTO wastewater biological treatment technology with MTO according to the characteristics of MTO wastewater. Organic combination of reaction gas separation technology

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  • Separation method of reaction gas generated in making alkenes from methanol

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Embodiment 1

[0034] For the reaction gas from the MTO reactor, the weight of ethylene and propylene accounts for 31% of the total weight of the reaction gas, the weight of water accounts for 61% of the total weight of the reaction gas, the weight of catalyst powder accounts for 0.2% of the total weight of the reaction gas, and the weight of other organic matter The weight accounts for 8% of the total weight of the reaction gas. When leaving the reactor, the temperature of the MTO reaction gas is 460°C. The reaction gas is cooled in the first stage by indirect heat exchange and medium-pressure steam generation. The temperature of the cooled MTO reaction gas is 210°C; then, The method of indirect heat exchange and low-pressure steam generation is used to cool the MTO reaction gas in the second stage. After the second stage cooling, the temperature of the MTO reaction gas is 110°C.

[0035] The MTO reaction gas with a temperature of 110 ° C is passed into the lower part of the separation towe...

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Abstract

The invention provides an integrated separation method of MTO reaction gas, wherein the MTO reaction gas is sent to a water-gas separating tower after being cooled to dew point. The method not only effectively removes silica-alumina molecular sieve type catalyst powder and acid oxygen-containing organic compounds to prevent acid corrosion to the subsequent compressor and separating equipment, but also recovers most organic compounds and water in MTO reaction products for further process and reuse. Processing MTO reaction gas by the process and conditions provided in the invention can increase the content of ethylene and propylene in alkenes to above 70%, reduce the content of catalyst powder in water obtained from solid-liquid separation below 300 mg / L; thereby provides conducive conditions for subsequent process of alkenes gas and waste water, and can be easily used in industry application.

Description

technical field [0001] The invention relates to a method for processing olefin-containing product streams, and more particularly to a separation and treatment method for reaction gas from oxygen-containing compounds to olefins. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important organic chemical raw materials and play a very important role in modern petroleum and chemical industries. Traditionally, the source of ethylene and propylene is mainly steam cracking of hydrocarbons, and the raw material is mainly naphtha. In recent years, the Oxygenate-to-Olefins (OTO) process, especially the Methanol-to-Olefins (MTO) process has become increasingly mature, and is expected to start large-scale application in the short term. [0003] The chemical reaction equation and thermal effect of producing ethylene and propylene from methanol are: [0004] 2CH 3 OH→C 2 h 4 +2H 2 O (ΔH=11.72KJ / mol, 427°C) [0005] 3CH 3 OH→C 3 h 6 +3H 2 O (ΔH...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/02C07C7/00C07C7/148C07C11/04C07C11/06
Inventor 李正琪程学文杨永强万国晖莫馗
Owner CHINA PETROLEUM & CHEM CORP
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