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Method for recovering light products of aromatics from methanol

A technology for recovering methanol and products, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, and production of hydrocarbons from oxygen-containing organic compounds, etc. It can solve the problems of high energy consumption and high hydrogen content in gas separation

Active Publication Date: 2019-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • 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 that there is a problem in the prior art that the high hydrogen content in the light products of methanol-to-aromatics leads to high energy consumption for gas separation, and a new method for recovering the light products of methanol-to-aromatics is provided

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  • Method for recovering light products of aromatics from methanol
  • Method for recovering light products of aromatics from methanol

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Embodiment 1

[0023] according to figure 1 The process flow shown. Methanol is reacted in a methanol reactor to generate methanol aromatization containing 1.2wt% hydrogen, 1.3wt% methane, 0.2wt% carbon dioxide, 55.4wt% water, 16.5wt% carbon two to carbon five hydrocarbons and 23.6wt% other hydrocarbons The product is obtained through heat exchange cooling and three-phase separation to obtain water, heavy hydrocarbons in the liquid phase and light hydrocarbon products in the gas phase, wherein the light product contains 53% hydrogen by volume. The light products are pressurized to 3MPa through the compressor, and 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 then sent to Membrane separation unit. A hollow fiber membrane is used to obtain a permeate gas with a hydrogen fraction of 89.7% and a pressure of ...

Embodiment 2

[0025] according to figure 1 The process flow shown. Methanol is reacted in a methanol reactor to generate methanol aromatization containing 1.2wt% hydrogen, 1.3wt% methane, 0.2wt% carbon dioxide, 55.4wt% water, 16.5wt% carbon two to carbon five hydrocarbons and 23.6wt% other hydrocarbons The product is obtained through heat exchange cooling and three-phase separation to obtain water, heavy hydrocarbons in the liquid phase and light hydrocarbon products in the gas phase, wherein the light product contains 53% hydrogen by volume. The light product is boosted to 2.1MPa by a compressor, the acid gas is removed by an alkali washing tower, so that the mass content of carbon dioxide in it is less than 10wppm, and the water is removed by a dryer, so that the mass content of water in it is less than 8wppm, and then sent to into the membrane separation unit. Porous and microporous inorganic ceramic membranes are used to obtain permeated gas with a hydrogen gas fraction of 91.2% and a...

Embodiment 3

[0027] according tofigure 1 The process flow shown. Methanol is reacted in a methanol reactor to generate methanol aromatization containing 1.2wt% hydrogen, 1.3wt% methane, 0.2wt% carbon dioxide, 55.4wt% water, 16.5wt% carbon two to carbon five hydrocarbons and 23.6wt% other hydrocarbons The product is obtained through heat exchange cooling and three-phase separation to obtain water, heavy hydrocarbons in the liquid phase and light hydrocarbon products in the gas phase, wherein the light product contains 53% hydrogen by volume. The light products are pressurized to 4MPa through 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 1wppm, and then sent to Membrane separation unit. A metal material membrane is used to obtain a permeate gas with a hydrogen fraction of 93.3% and a pressure of 2.7 ...

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Abstract

The invention relates to a method for recycling a light product obtained by preparing arene from methanol. The method mainly aims at solving the problem that in the prior art, in a light product obtained by preparing arene from methanol, the hydrogen content is high, so that gas separation is high in energy consumption. The method comprises the following steps that 1, the methanol is converted into a methanol aromatization product containing hydrogen, hydrocarbons and water in a methanol reactor; 2, the aromatization product is separated into the gaseous light product, an oil phase and water in a three-phase separation unit; 3, after being compressed, the light product is sent into a membrane separation unit to be separated into hydrogen-enriched gas and hydrocarbon-enriched gas; 4, the hydrocarbon-enriched gas is sent into a demethanization unit to be separated into methane, C2 and heavier hydrocarbons; 5, C2 and the heavier hydrocarbons are sent into a light dydrocarbon reactor to be converted into a light dydrocarbon aromatization product; and 6, the light dydrocarbon aromatization product returns to a three-phase separation unit. By means of the method for recycling the light product obtained by preparing the arene from the methanol, the mentioned problem is well solved, and the method can be applied to industrial production of the arene.

Description

technical field [0001] The invention relates to a method for recovering 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, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C7/00C07C7/11C07C7/12C07C15/04C07C15/06C07C9/04C01B3/26C01B3/50
Inventor 贺来宾金鑫杨卫胜
Owner CHINA PETROLEUM & CHEM CORP
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