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Method for reclaiming ethylene in catalytic dry gas

A dry gas and ethylene technology, applied in chemical instruments and methods, liquefaction, organic chemistry, etc., can solve the problems of high energy consumption, large investment and large equipment scale, and achieve the effect of low energy consumption, less investment and less equipment

Active Publication Date: 2010-01-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problems of high energy consumption, large equipment scale and large investment in the existing process of recovering ethylene from refinery dry gas, and proposes a method for separating ethylene in catalytic dry gas by using mixed refrigeration

Method used

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  • Method for reclaiming ethylene in catalytic dry gas

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Embodiment 1

[0032] This embodiment further explains the method of the present invention by taking the recovery of ethylene from a refinery catalytic dry gas as an example, and the composition of the catalytic dry gas is listed in Table 1.

[0033] Table 1 Composition of catalytic dry gas in a refinery

[0034]

[0035] (1) Catalytic dry gas cooling: The catalytic dry gas with a flow rate of 13504 kg / h passes through the purification system 8 and the dryer 9 to remove carbon dioxide, oxygen, NOx and water, and then enters the cold box 7 . After the catalytic dry gas is cryogenically cooled to -105°C, it enters the heavy hydrocarbon separation tank 10 . The gaseous phase with a mass flow rate of 7495kg / h at the top of the tank enters the cold box 7 again to continue deep cooling, and the liquid phase at the bottom of the tank with a mass flow rate of 5003kg / h is directly sent to the methane tower 11. The temperature of the gas phase after being cryogenically cooled again is -142°...

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Abstract

The invention discloses a method for reclaiming ethylene in catalytic dry gas, belongs to an ethylene separation method, and provides the method for separating the ethylene from the catalytic dry gas by using mixed gas as refrigerant in order to solve the problems that the prior process for reclaiming the ethylene from the dry gas of a refinery has high energy consumption, large equipment scale, high investment and the like. The method adopts an expander and an ice chest to reclaim cold energy through three-stage compression and refrigeration, and then obtains material flow rich in the ethylene from a tower bottom by removing methane and hydrogen in a methane removing tower so as to greatly improve the reclamation rate of the ethylene and reduce the energy consumption. The method of the invention has the advantages of less equipment, simple flow, simple refrigeration cycle and less investment.

Description

technical field [0001] The invention relates to a method for separating ethylene, more specifically, the invention relates to a method for recovering ethylene in catalytic dry gas. Background technique [0002] Refinery dry gas refers to the gas products produced by catalytic cracking, thermal cracking, delayed coking and other devices in refineries after absorption and separation 3 The remaining gas components after the above heavy components. In addition to containing inert gases such as nitrogen and carbon monoxide and acid gases such as carbon dioxide and hydrogen sulfide, it is also rich in heavy hydrocarbons such as hydrogen, methane, ethylene, ethane and a small amount of propylene, and is an important source of basic chemical raw materials. Rational use of refinery dry gas is an important way to improve refinery processing depth and economic benefits. Refinery dry gas usually contains 10-20% ethylene and 10-25% ethane, as well as useful components such as propylene...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C7/00C07C7/09
CPCF25J3/0219F25J3/0233F25J3/0238F25J3/0252F25J2200/70F25J2205/04F25J2210/12F25J2215/62F25J2270/04F25J2270/18F25J2270/66
Inventor 程建民过良李东风廖丽华刘智信王婧李晓锋李琰
Owner CHINA PETROLEUM & CHEM CORP
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