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A system and method for recovering ethylene from mto/dto product gas

A product gas and tail gas recovery technology, applied in chemical instruments and methods, climate sustainability, purification/separation of hydrocarbons, etc., can solve problems such as heavy workload and complex operation, and achieve easy operation, investment saving, and energy control consumption effect

Active Publication Date: 2016-04-13
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses PSA technology, which is complicated to operate and requires a lot of work for daily maintenance.

Method used

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  • A system and method for recovering ethylene from mto/dto product gas
  • A system and method for recovering ethylene from mto/dto product gas
  • A system and method for recovering ethylene from mto/dto product gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Such as figure 1 Shown is a system for recovering ethylene from MTO / DTO product gas.

[0055] Including: separation unit of carbon 2 and light components, carbon 3 and heavy components, methane hydrogen removal unit, tail gas recovery unit and ethylene rectification unit, separation unit of carbon 2 and light components, carbon 3 and heavy components including deethanization Tower 11, the methane hydrogen removal unit includes a demethanizer 21, the tail gas recovery unit includes a tail gas cooling device 31 and a tail gas condensation separation device 32, and the ethylene rectification unit includes an ethylene tower 41;

[0056] The top outlet of the demethanizer 21 is connected to a tail gas cooler 33 .

[0057] Separation unit for carbon 2 and light components and carbon 3 and heavy components: After the pretreated gas is cooled, it enters the dryer to remove water, and then enters the deethanizer 11 to make carbon 2 and light components and carbon Three and hea...

Embodiment 2

[0071] Such as figure 2 Shown, with embodiment 1, difference is:

[0072] The tail gas recovery unit also includes a cold recovery device 37 . The top of the demethanizer is connected to the tail gas cooler 33 and the cooling recovery device 37 respectively; the tail gas condenser 36 is connected to the cooling recovery device 37.

[0073] The refrigerant used in the tail gas condenser is A, the mixture of carbon 1 and carbon 2 from the top reflux tank of the demethanizer; and B, the non-condensable gas discharged from the top of the tail gas condensation and separation device. The converted ethylene recovery rate is 99.71%.

Embodiment 3

[0075] Such as image 3 Shown, with embodiment 2, difference only lies in:

[0076] The refrigerant used in the tail gas condenser is only A, the mixture of carbon 1 and carbon 2 from the top reflux tank of the demethanizer. The converted ethylene recovery rate is 99.74%.

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PUM

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Abstract

The invention discloses a system and a method for recycling ethylene from an MTO / DTO product gas. The system includes a unit of separating C2 and light components with C3 and heavy components, a methane and hydrogen removal unit, a tail gas recycling unit and an ethylene rectification unit. The method includes a refrigerant used in the tail gas recycling unit is a C1 and C2 mixture from a demethanization tower top and / or a reflux tank. The system and the method can significantly improve the recycling efficiency of the ethylene component in the tail gas, the ethylene recycling rate of the method is not less than 99.7%, and an additional ethylene refrigeration system is not required.

Description

technical field [0001] The invention relates to the field of separation of light olefins, and more specifically, to a system and method for recovering ethylene from MTO / DTO product gas. Background technique [0002] With the development of the economy, the demand for low-carbon olefins is increasing day by day. At the same time, due to the increasing shortage of petroleum resources, raw material resources such as naphtha and light diesel oil, which are used as raw materials for ethylene production, are facing increasingly serious shortages. Therefore, the application of methanol to olefin (Methanol To Olefin, hereinafter referred to as MTO) or dimethyl ether to olefin (Dimethylether To Olefin, hereinafter referred to as DTO) technology has attracted attention from various aspects. MTO technology or DTO technology refers to the process technology of producing low-carbon olefins such as ethylene and propylene by using coal-based or natural gas-based synthetic methanol or dimet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/04C07C7/00
CPCY02P20/10Y02P20/50
Inventor 刘罡王振维王子宗陈海
Owner CHINA PETROCHEMICAL CORP