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Process for absorption and recycling of ethylene in olefin reaction products prepared from methanol

A reaction product and methanol recovery technology, applied in ethylene production, absorption purification/separation, organic chemistry, etc., can solve the problems of increased investment, complicated process, large consumption, etc., and achieve flexible and stable operation, short circulation route, and reduced load Effect

Active Publication Date: 2015-02-11
SHANGHAI HOTO PETROCHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with directly using an unseparated mixed absorbent, the absorption effect is similar, but the consumption of steam, refrigerant, circulating water, etc. is large
At the same time, this process uses a fractionating tower to complete the separation of methane / hydrogen and carbon dioxide, which consumes a lot of energy
In addition, this process needs to set up an absorbent separation tower separately, which increases investment and makes the process complicated

Method used

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  • Process for absorption and recycling of ethylene in olefin reaction products prepared from methanol
  • Process for absorption and recycling of ethylene in olefin reaction products prepared from methanol
  • Process for absorption and recycling of ethylene in olefin reaction products prepared from methanol

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A process for absorbing and recovering ethylene in the methanol-to-olefins reaction product, such as figure 1 As shown, the outlet gas 100 of a certain reactor is compressed, washed with water, washed with alkali, deoxidized and dried, and then enters the separation system of the pre-depropanization process. Specifically, the reactor outlet gas 100 enters the depropanizer 1 to separate C3 / C4, and the products below C3 and C3 at the top of the tower are compressed by the compressor 2 and cooled to 5~-37°C by the heat exchanger 3, The obtained pretreated gas 101 enters the demethanizer 4, and the light gas 102 at the top of the demethanizer 4 enters the ethylene recovery tower 5 for absorption and separation, and the methane concentration in the bottom of the demethanizer 4 is controlled at 5-200ppm, and the ethylene The gas phase 103 at the top of the recovery tower is light component gases such as methane and hydrogen, and the product 104 in the bottom of the ethylene r...

Embodiment 2

[0038] A process for absorbing and recovering ethylene in the methanol-to-olefins reaction product, such as figure 2 As shown, the process is roughly the same as that of Example 1, except that the reactor outlet gas 100 is preliminarily cooled through the heat exchanger 3 before entering the demethanizer 4 . In addition, two intercoolers 6 are provided in the ethylene recovery tower 5 .

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Abstract

The invention relates to a process for absorption and recycling of ethylene in olefin reaction products prepared from methanol. The process includes the steps: cooling pretreated outlet gas of a reactor to -37 to 5 DEG C, then sending into a demethanizer; (2) cooling demethanizer tower top products and then sending into an ethylene recycling tower, or directly sending the demethanizer tower top products into the ethylene recycling tower, and employing C4+ (components with four and more than four carbon atoms) as an absorbent to absorb ethylene from the demethanizer tower top products; and (3) sending absorption tower bottom products into a depropanizer for separation. Compared with the prior art, the process has the characteristics of simple process, less investment, low energy consumption and the like.

Description

technical field [0001] The invention relates to the fields of coal chemical industry, natural gas chemical industry, petrochemical industry and the like, in particular to a process for absorbing and recovering ethylene in the methanol-to-olefin reaction product. Background technique [0002] Ethylene and propylene are important basic raw materials in petrochemical industry, and their development level represents the overall level of a country's petrochemical industry. However, the limitations of my country's petroleum resources determine that the development of my country's ethylene industry cannot solely rely on petroleum hydrocarbons as raw materials. Under this background, the production of methanol from coal and the production of low-carbon olefins from methanol have become a production route that has attracted much attention. [0003] In the traditional hydrocarbon cracking to ethylene production, typical separation methods are mainly divided into: sequential process, pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C7/11C07C7/04
CPCY02P30/40
Inventor 李立新张韩
Owner SHANGHAI HOTO PETROCHEM ENG
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