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Methanol-to-aromatic hydrocarbon lightweight product treatment method

A treatment method, methanol technology, applied in the purification/separation of hydrocarbons, chemical instruments and methods, and the production of hydrocarbons from oxygen-containing organic compounds, etc., can solve the problem of high energy consumption in gas separation, and achieve reduced energy consumption, reduced energy consumption, The effect of reducing the feed load

Active Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of high gas separation energy consumption in the utilization process of methanol-to-aromatics light products in the prior art, and a new treatment method for methanol-to-aromatics light products is provided

Method used

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  • Methanol-to-aromatic hydrocarbon lightweight product treatment method

Examples

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Effect test

Embodiment 1

[0025] according to figure 1The process flow shown. Methanol with a scale of 225 tons / hour is reacted in a methanol reactor to produce 1.2wt% hydrogen, 1.3wt% methane, 0.2wt% carbon dioxide, 55.4wt% water, 16.5wt% carbon two to carbon five hydrocarbons and 23.6wt% others Methanol aromatization products of hydrocarbons, through heat exchange cooling and three-phase separation to obtain water phase, oil phase and gas phase, wherein the mass flow rate of the gas phase is 45.6 tons / hour, containing 53% hydrogen by volume and 8% methane by volume , 0.5% volume fraction of carbon dioxide, 1.5% volume fraction of carbon monoxide and 34% volume fraction of carbon dioxide and above hydrocarbons. After the gas phase is boosted to 2.8MPa by the compressor, the acid gas is removed through the alkali washing tower, so that the mass content of carbon dioxide in it is less than 5wppm, and the water is removed through the dryer, so that the mass content of water in it is less than 3wppm, and...

Embodiment 2

[0030] according to figure 1 The process flow shown. Methanol with a scale of 1.8 million tons / year is reacted in a methanol reactor to produce 0.7wt% hydrogen, 1.5wt% methane, 0.2wt% carbon dioxide, 56.3wt% water, and 16.8wt% and 24.5wt% of C2 to C5 hydrocarbons Methanol aromatization products of other hydrocarbons, after heat exchange cooling, three-phase separation to obtain water phase, oil phase containing heavy hydrocarbons such as benzene, toluene, xylene and hydrogen and light hydrocarbon products such as methane, ethylene , ethane, propylene, propane gas phase, wherein the gas phase contains 40.4% volume fraction of hydrogen. After the gas phase is boosted to 2.1MPa by the compressor, the acid gas is removed through the alkali washing tower, so that the mass content of carbon dioxide in it is less than 10wppm, and the water is removed through the dryer, so that the mass content of water in it is less than 8wppm, and then sent to into the membrane separation unit. A...

Embodiment 3

[0033] according to figure 1 The process flow shown. Methanol with a scale of 1.8 million tons / year is reacted in a methanol reactor to produce 2.5wt% hydrogen, 1.2wt% methane, 0.2wt% carbon dioxide, 55.5wt% water, and 16.6wt% and 24.0wt% of C2 to C5 hydrocarbons Methanol aromatization products of other hydrocarbons, after heat exchange cooling, three-phase separation to obtain water phase, oil phase containing heavy hydrocarbons such as benzene, toluene, xylene and hydrogen and light hydrocarbon products such as methane, ethylene , ethane, propylene, propane gas phase, wherein the gas phase contains 69.5% volume fraction of hydrogen. After the gas phase is boosted to 2.5MPa by the compressor, the acid gas is removed through the alkali washing tower, so that the mass content of carbon dioxide in it is less than 6wppm, and the water is removed through the dryer, so that the mass content of water in it is less than 3wppm, and then sent to into the membrane separation unit. Th...

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Abstract

The present invention relates to a methanol-to-aromatic hydrocarbon lightweight product treatment method. A purpose of the present invention is mainly to solve the problem of high gas separation energy consumption in the methanol-to-aromatic hydrocarbon lightweight product utilization process. The technical scheme of the present invention comprises that a methanol aromatization product is separated into a gas phase, an oil phase and a water phase in a three-phase separation unit; the gas phase is compressed and then is conveyed into a membrane separation unit so as to be separated into hydrogen-rich gas and poor hydrogen gas; the poor hydrogen gas is cooled and then is conveyed into a first gas-liquid separation unit so as to be separated into first methane-rich gas and a first poor methane liquid; the first methane-rich gas is separated into second methane-rich gas and a second poor methane liquid; the second methane-rich gas is conveyed into a gas separation unit so as to be separated into methane gas and the streams of hydrocarbons having a carbon atom number of more than or equal to 2; and the streams of the hydrocarbons having a carbon atom number of more than or equal to 2, the first poor methane liquid and the second poor methane liquid are conveyed into a light hydrocarbon reactor and are converted into the light hydrocarbon aromatization product. With the technical scheme, the problem in the prior art is well solved. The method of the present invention can be used for the industrial production of aromatic hydrocarbons.

Description

technical field [0001] The invention relates to a method for treating light products of aromatics produced from methanol. [0002] technical background [0003] Aromatics, especially light aromatics BTX (benzene, toluene, xylene), are important basic organic chemical raw materials, and their output and scale are second only to ethylene and propylene. The main source of aromatics is the catalytic reforming of naphtha. Combining my country's rich coal resources and increasing dependence on oil, the development of coal-to-aromatics technology with raw material price advantages has become a research hotspot in the past ten years, and technological breakthroughs have been made in recent years, especially coal-based methanol-to-aromatics technology has been The industrial demonstration test has been completed. [0004] A major feature of methanol-to-aromatics technology is that there are a wide variety of reaction products, including not only target products such as aromatics, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C9/04C07C7/00C07C15/02C07C2/00C01B3/50
CPCC01B3/50C07C1/20C07C2/00C07C7/005C07C9/04C07C15/02
Inventor 杨卫胜金鑫贺来宾
Owner CHINA PETROLEUM & CHEM CORP
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