A system and method for recovering ethylene from high-propylene light hydrocarbons or methanol-to-propylene product gas
A technology for producing propylene from methanol and high propylene light hydrocarbons, which is applied in the fields of ethylene production, hydrocarbon purification/separation, chemical instruments and methods, etc. It can solve the problems of low utilization rate of cooling capacity and large loss of ethylene, and improve operational performance , reduce losses and improve utilization
Active Publication Date: 2018-08-14
SINOPEC ENG +1
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Problems solved by technology
[0014] CN101747128B discloses a method for separating low-carbon olefin gases from methane to solve the disadvantage of large ethylene loss in the demethanizer overhead gas in the prior art
[0019] Some patents propose that the tail gas of the demethanizer of the methanol-to-olefins plant can be recovered by low-temperature expansion, and the tail gas recovery technology composed of a cold box and an expander stipulated in these patents is relatively close to the expansion and condensation technology of the tail gas of the demethanizer of the traditional ethylene plant. Utilization rate is not high
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[0079] Such as figure 1 As shown, a system for recovering ethylene from high-propylene light hydrocarbons or methanol-to-propylene product gas.
[0080] Including: first deethanizer 1, depropanizer 15, dryer 2, hydrogenation reactor 3, demethanizer 5, demethanizer tail gas recovery unit, second deethanizer 13 and ethylene rectification tower 14 ;
[0081] The tail gas recovery unit is composed of combined absorption tower 7, expander 11 and second gas-liquid separation tank 10; the upper part of combined absorption tower 7 is a cryogenic rectification tower section 9, and the lower part is an absorption tower section 8;
[0082]The top of the first deethanizer 1 is connected to the dryer 2 and then connected to the hydrogenation reactor 3, the bottom of the hydrogenation reactor 3 is connected to the gas-liquid separation tank 4, and the gas-liquid separation tank 4 is connected to the demethanizer 5;
[0083] The pipeline at the bottom of the first deethanizer 1 is divided ...
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The present invention discloses a system and a method for recovering ethylene from high propylene light hydrocarbons or a methanol-to-propylene product gas. The system comprises a first deethanizer, a second deethanizer, a dryer, a hydrogenation reactor, a demethanizer, a demethanizer tail gas recovery unit and an ethylene rectification column, the demethanizer tail gas recovery unit comprises a combination absorber, an expander and a second gas-liquid separation tank; the upper section of the combination absorber is a deep-cooling rectification column section, the lower part of the combination absorber is an absorber section. A front-end deethanization front-end hydrogenation, twin-tower deethanization and intercooling C3-C6 light hydrocarbon mixture absorbs demethanizer tail gas, an absorbent is from bottom products of the first deethanizer and a depropanizer, and the second deethanizer and the ethylene rectification column are directly thermally coupled. The system can increase ethylene recovery rate of the apparatus, and reduces the loss of the absorbent to further reduce energy consumption and investment of the section of recovery of the ethylene from the product gas.
Description
technical field [0001] The invention relates to the field of refining low-carbon olefins with high propylene content, and furthermore, relates to a system and method for recovering ethylene from high-propylene light hydrocarbons or methanol-to-propylene product gas. Background technique [0002] Ethylene and propylene are the basic raw materials of the petrochemical industry. With the development of economy and the shortage of petroleum resources, raw materials such as naphtha and light diesel oil, which are used as raw materials for ethylene production, are facing more and more serious shortages. As the demand for ethylene and propylene increases year by year, the demand ratio of propylene / ethylene is on the rise, and the output ratio of propylene / ethylene is on the decline. Therefore, catalytic cracking (including catalytic cracking to olefins CPP, deep catalytic cracking DCC, olefins catalytic cracking OCC , Superflex and ACO), methanol-to-olefins (MTO) or methanol-to-pro...
Claims
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IPC IPC(8): C07C11/04C07C7/00C07C11/06C07C1/20
CPCY02P30/20Y02P30/40
Inventor 王子宗刘洪谦李广华王基铭
Owner SINOPEC ENG