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A separation system and method for by-product liquefied gas from methanol to aromatics

A technology for liquefied gas and aromatic hydrocarbons, which is applied in the production of hydrocarbons from oxygen-containing organic compounds, gas fuels, organic chemistry, etc., and can solve the problems that do not involve the subsequent conversion of C3, and do not involve high value-added new products. Maximize and other issues to achieve the effect of sufficient raw material sources, small load impact, and reduced investment costs

Active Publication Date: 2017-07-14
HUADIAN COAL IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN103740421B discloses a process for removing C3 from post-ether liquefied gas. After removing impurities such as methanol and metal cations, the post-ether liquefied gas enters the de-C3 tower to remove C3 fractions, but does not involve subsequent conversion of C3.
[0004] CN103755513A discloses a C4 process for post-ether liquefied gas recovery. Skeletal isomerization of n-butene-rich materials to produce isobutene can achieve the purpose of increasing isobutene production, but it does not involve further conversion into high value-added new products after product separation The process cannot achieve the maximization of product benefits

Method used

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  • A separation system and method for by-product liquefied gas from methanol to aromatics

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. Using the low-carbon hydrocarbons by-produced from methanol-to-aromatics as raw material, the liquid-liquid-gas three-phase separation tower is used to separate the oil phase product, the water phase product and the gas phase product, wherein the gas phase product with a propane content of 27wt% enters the process gas Compressor, compressed to 0.1-2.0MPa;

[0033] b. The compressed gas phase product enters the decarburization tower, the operating temperature is 60°C-220°C (120°C), and the operating pressure is 0.1-2.0MPa. After three stages of alkali washing and one stage of water washing, the carbon dioxide is reduced from 2% to 0.002 %about;

[0034] c. The gas phase product after decarburization enters the temperature swing adsorption device, and is subjected to temperature swing adsorption drying under the conditions of 20°C to 180°C and 1.0 to 2.0MPa, and the dew point temperature reaches -30°C to -80°C;

[0035] d. The gas phase product after temperature swing...

Embodiment 2

[0043] a. Using the low-carbon hydrocarbons by-produced from methanol-to-aromatics as raw material, the liquid-liquid-gas three-phase separation tower is used to separate the oil phase product, the water phase product and the gas phase product, wherein the gas phase product with a propane content of 27wt% enters the process gas Compressor, compressed to 1.4~1.7MPa;

[0044] b. The compressed gas phase product enters the decarburization tower, the operating temperature is 100°C~150°C (120°C), and the operating pressure is 1.4~1.7MPa. After three stages of alkali washing and one stage of water washing, the carbon dioxide is reduced from 2% to 0.002 %about;

[0045] c. The gas phase product after decarburization enters the temperature swing adsorption device, and is subjected to temperature swing adsorption drying under the conditions of 20°C to 180°C and 1.0 to 1.4MPa, and the dew point temperature reaches -30°C to -60°C;

[0046] d. The gas phase product after temperature swin...

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Abstract

The invention belongs to the technical field of energy utilization, and especially relates to a separation system and a method of methanol to aromatics by-product liquefied gas. The separation system comprises a liquid-liquid-gas three phase separating tower, a process gas compressor, a decarbonizing tower, a temperature swing adsorption device, a propylene cooler, a liquefied gas separator, a liquefied gas product tank zone, an aromatization reactor, a pressure swing adsorption device, a methanol conversion device, a fuel gas pipe network, and an alkali liquor tank. Process flow of the method is short; operation is simple; materials are not recycled; influence on system load is low; and operation cost is low. 1400 to 2000kg of liquefied gas can be recycled per hour via the method, raw material resource is sufficient, a problem that too much liquefied gas is generated after methanol reaction is solved preferably, and a large amount of raw materials is provided for light dydrocarbon reactors.

Description

technical field [0001] The invention belongs to the technical field of energy utilization, and in particular relates to a separation system and method for producing aromatics by-product liquefied gas from methanol. Background technique [0002] Coal-to-methanol technology is already common, and methanol is currently in a state of overcapacity. The methanol-to-aromatics technology is still an emerging industry. In addition to producing aromatics, a new product with a large market gap and wide application, methanol can also react on the ZSM-5 dual-function catalyst to produce a large amount of liquefied gas. The separation and utilization of these liquefied gases are the key factors affecting the investment of the equipment and the cost of the products, which can be transformed according to the needs of the market: first, to separate and directly send the liquefied gas to the storage tank area as a product for sale; second, to use the liquefied gas as a product The raw materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/02C07C1/20C10L3/12
Inventor 罗腾发梁彦鸿杜芳彦崔宇柴鹏飞黄晓凡毕涛汤效平王彤郭子殿高长平折飞管春峰张卫中丁焕德孙卫国
Owner HUADIAN COAL IND GRP