Separating method for converting methanol to prepare low carbon olefin gas

A low-carbon olefin and methanol conversion technology, which is applied in the field of light hydrocarbon refining, can solve the problems of accumulation of dangerous substances, explosion of cold box parts, increase of unsafe factors in the system, etc., and achieve the goal of shortening the process, reducing power consumption and improving operation stability Effect

Active Publication Date: 2006-10-18
CHINA PETROCHEMICAL CORP +1
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Problems solved by technology

But for DMTO gas, because it contains nitrogen oxides (NO X ) and oxygen and other impurity gases will lead to the accumulation of explosive hazards in the cold box, resulting in increased system unsafe factors

Method used

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  • Separating method for converting methanol to prepare low carbon olefin gas
  • Separating method for converting methanol to prepare low carbon olefin gas

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Embodiment Construction

[0021] Such as figure 1 , figure 2 As shown, the DMTO raw material gas 1 is compressed and dried in four stages, the pressure is 2.5~3.5MPa, and then gradually cooled to -10~-20°C by three coolers 2, and enters the deethanizer 4, the deethanizer The purpose of 4 is to remove propylene, propane and heavier fractions in DMTO raw gas 1, avoid propylene, propane and heavier fractions from entering the cold zone, and reduce the power consumption of DMTO gas compressor and refrigeration compressor. The top of the deethanizer 4 separates carbon 2 and light components 3 at the top of the deethanizer below the carbon 2. The light component 3 at the top of the deethanizer first passes through the cooler 2 to exchange heat with the raw gas 1, and then enters the fifth stage of the gas compressor 5 to continue compression, and the pressure reaches 2.5-4.0MPa. The heavy component 13 at the bottom of the deethanizer tower separated from the deethanizer 4 is C3 and above. The heavy compon...

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Abstract

The present invention discloses separating method for converting methanol to prepare DMTO gas, and has improved process after four section compression in the front ethane eliminating process. The present invention has one increased hydrogenating oxygen conversion step between the five section compression and the reflux accumulator of ethane eliminating tower to eliminate acetylene and oxygen produced in the regeneration. Of the condensed and cooled material through the reflux accumulator of ethane eliminating tower, the liquid phase serves as the reflux liquid of the ethane eliminating tower, the gas phase is fed to the deep cooling methane eliminating system and the material after condensing and cooling enters the high pressure methane eliminating tower directly. The DMTO gas separating process can obtain ethylene recovering rate as high as 99.5 %.

Description

technical field [0001] The invention belongs to the technical field of light hydrocarbon refining, and relates to a method for separating methanol to produce light olefin gas. Background technique [0002] Ethylene and propylene are important petrochemical basic raw materials. The tube furnace cracking unit that uses naphtha as raw material to produce ethylene and propylene through steam cracking is currently the most important industrial production unit of ethylene and propylene. The cracked gas produced by hydrocarbon cracking is a mixture containing hydrogen, methane, ethane, ethylene, propane, propylene, mixed carbon four carbon five, cracked gasoline, etc., and the cracked gas is required to be separated and processed in order to produce qualified ethylene and propylene. refined. "Ethylene Engineering" edited by Chen Bin (January 1997, Chemical Industry Press, ISBN 7-5025-1759-6) has a detailed description of the cryogenic separation process of cracked gas. After the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C1/20C07C11/04C07C11/06
CPCY02P30/20Y02P30/40
Inventor 李网章吴艳春
Owner CHINA PETROCHEMICAL CORP
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