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A method for purifying and reusing methane-induced stable gas with high purity and high yield in the production of ethylene oxide by ethylene method

A technology of ethylene oxide and ethylene method, applied in chemical instruments and methods, separation methods, absorption purification/separation, etc., can solve problems such as poor stability and safety, low methane waste rate, rising energy consumption and production cost, etc. , to achieve the effect of safety, stability and economic benefits, low waste rate and load reduction

Active Publication Date: 2021-06-25
ZHEJIANG TIANCAIYUNJI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned EO production process and equipment, the purification process of methane-induced stabilizing gas is separate and isolated, and has no connection with other sections in EO production, such as recycle gas and tail gas treatment equipment, and more fresh methane-induced gas is required. The continuous replenishment of stable gas will lead to more serious waste of methane, the worsening of the stability and safety of the device, the increase of energy consumption and production cost and many other problems. The purpose of the present invention is to provide a Purification and reuse method of high-purity and high-yield methane in legal ethylene oxide to stabilize gas, purification of natural gas through PSA decarburization and dehydration, drying and dehydration of EO reaction cycle gas, recovery of methane-rich gas flowing out of each section of EO and The FTrPSA recovery of the tail gas is coupled to achieve the purpose of methane purification and recycling as a stabilizing gas. At the same time, the waste rate of methane is minimized, and the operation of the EO unit is safer and more stable and the economic benefits are improved.

Method used

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  • A method for purifying and reusing methane-induced stable gas with high purity and high yield in the production of ethylene oxide by ethylene method
  • A method for purifying and reusing methane-induced stable gas with high purity and high yield in the production of ethylene oxide by ethylene method
  • A method for purifying and reusing methane-induced stable gas with high purity and high yield in the production of ethylene oxide by ethylene method

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Effect test

Embodiment 1

[0036] A method for purifying and reusing stable gas caused by high-purity and high-yield methane in the production of ethylene oxide by ethylene method, comprising the following steps:

[0037] (1) Using commercial natural gas as raw material, its components are: methane (CH4) 94.18% (volume ratio, the same below), ethane (C2H6) 3.50%, propane (C3H8) 0.10%, butane (including isobutane Alkanes) 0.21%, carbon five carbon six alkanes (C5+) 0.14%, nitrogen (N2) 1.20%, carbon dioxide (CO2) 0.67%, water dew point -17.8 ℃, hydrogen sulfide 0.76mg / m3, oxygen (O2) 0.1%, The raw gas pressure is 50KPa, the temperature is normal temperature, and the flow rate is 2,500Nm3 / h. After being compressed by the compressor to 2.3MPa, it directly enters the PSA system with an operating temperature of 30°C and an operating pressure of 2.3MPa for decarburization and dehydration. The system consists of It is composed of 5 adsorption towers and corresponding pipelines, regulating valves and control va...

Embodiment 2

[0042] Based on Example 1, such as figure 1 As shown, industrial natural gas is used as the stabilizing gas in the process of preparing ethylene oxide by the ethylene method. Its main components are methane (CH4) 97.15% (volume ratio, the same below), ethane (C2H6) 0.50%, Propane (C3H8) 0.01%, butane (including isobutane) 0.02%, carbon five carbon six alkanes (C5+) 0.014%, nitrogen (N2) 0.76%, carbon dioxide (CO2) 1.4%, water dew point - 17.8°C, hydrogen sulfide 0.26mg / m3, oxygen + argon (O2+Ar) 0.006%, helium (He) 0.02%, raw material gas pressure 3.0MPa, temperature is normal temperature, the pressure required for EO reaction is the same as the example 1. The natural gas raw material is reduced to 2.3MPa after being regulated by a pressure regulating valve, and then enters the PSA system for decarburization, decarburization and dehydration, and the subsequent steps are the same as in Example 1.

Embodiment 3

[0044] Based on Examples 1 and 2, such as figure 1 As shown, the desorbed gas obtained from the PSA system in step (2) is blown and pressurized, and 40~50% of it enters the EO reaction cycle gas compressor for pressurization to the pressure required for the EO reaction of 2.2MPa and then returns directly To the ethylene oxide reaction cycle gas for reaction, most of the rest enters the regeneration tower for carbon dioxide absorption, and a small amount is directly sent to the fuel gas pipeline network, which will increase the load of the CO2 absorption system and increase the circulation of the thermal alkali absorbent. And the replacement gas volume of the FTrPSA system, the replacement gas is ethylene concentrated gas, and the concentration of ethylene is 85-90%.

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Abstract

The invention discloses a method for purification and reuse of high-purity and high-yield methane stabilized gas from ethylene oxide produced by ethylene method, which includes the following steps: (1) natural gas enters a PSA system for dehydrocarbonation, decarburization and dehydration to obtain non-adsorbed phase gas The methane product gas enters the reactor reaction as a stable gas produced by ethylene oxide (EO) from ethylene; (2) Obtain the adsorption phase gas from (1), and return part of it to the ethylene oxide reaction cycle gas reaction; (3) The reaction cycle gas formed by the reaction is partially returned to the ethylene oxide reactor, and part of it enters the CO2 absorption tower for decarburization to form non-condensable gas and returns to the reactor; (4) The EO stripper top gas enters the EO reabsorption tower to form The non-condensable gas enters the full temperature range pressure swing adsorption (FTrPSA) to recover ethylene, and the part of the methane-rich tail gas flowing out is returned to (1); the part of the ethylene-rich gas flowing out is returned to the reaction cycle gas for recycling, and part of it is sent to ethylene rectification for recovery and refining Ethylene is recycled as the ethylene needed for EO reaction.

Description

technical field [0001] The invention relates to the purification and comprehensive utilization of natural gas in the fields of petrochemical and fine chemical industries, and more specifically relates to a method for purifying stable gas from high-purity and high-yield methane in the production of ethylene oxide by ethylene method. Background technique [0002] As the main derivatives of ethylene, ethylene oxide (EO) and its downstream ethylene glycol (EG) are widely used in the fields of surfactants and synthetic fibers. In addition to the ethylene oxidation catalyst with high selectivity and long life and corresponding operating conditions, the use of stabilizer (gas) in the reaction process is also recognized as an important technical link by craftsmen and manufacturers, which is related to the EO production unit. Stability, safety and economy. Methane, as a stabilizing gas in the process of direct oxidation of ethylene to EO, has been widely used in the industry. Compa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/047C07C7/12C07C7/13C07C7/11C07C9/04
CPCB01D53/047B01D2253/102B01D2253/104B01D2253/116B01D2256/245B01D2259/4061C07C7/11C07C7/12C07C7/13C07C9/04Y02P20/151
Inventor 钟娅玲汪兰海陈运唐金财钟雨明蔡跃明
Owner ZHEJIANG TIANCAIYUNJI TECH CO LTD
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