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METHOD FOR PREPARING POLYMER GRADE LOW-CARBON OLEFIN THROUGH SEPARATION OF METHANOL PYROLYSIS GAS

  • US 20100234659A1
  • Filed: 07/27/2007
  • Published: 09/16/2010
  • Est. Priority Date: 07/27/2007
  • Status: Active Grant
First Claim
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1. A method for preparing polymer grade low-carbon olefin through separation of methanol pyrolysis gas, comprising the following steps of:

  • (1) Compression;

    methanol pyrolysis gas being sent into the compression system for multistage compression;

    (2) Impurity removal;

    methanol pyrolysis gas compressed in step (1) being impurity-removed in the impurity removal system to obtain refined pyrolysis gas;

    (3) Absorption and separation;

    the refined pyrolysis gas obtained in step (2) is separated through the absorption and separation system, during which said gas being firstly sent into the front-end ethylene removing column, and then further absorbed and separated to produce the polymer grade ethylene products, polymer grade propylene products, and C4 and C5 products.

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