Method for improving yield of light olefin

Method for improving yield of light olefin

  • CN 101,259,433 B
  • Filed: 04/24/2008
  • Issued: 04/03/2013
  • Est. Priority Date: 04/24/2008
  • Status: Active Grant
First Claim
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1. method that improves yield of light olefin said method comprising the steps of:

  • (a) the pre-carbon deposit that at first carries out catalyzer is processed;

    after molecular sieve catalyst is added reactor, rising temperature of reaction to 150~

    450 ℃

    , to comprise that the raw material of methyl alcohol or dme enters the reaction zone of reactor by feed distributor, contact with described molecular sieve catalyst, generate coke at molecular sieve catalyst, described molecular sieve catalyst with coke is after leaving reaction zone, do not enter the revivifier coke-burning regeneration, continue behind the reaction zone to react with described raw material but turn back to by catalyst recycle line, until after the average coke content of catalyzer in the reactor reached 1.0~

    6.0% weight of catalyst weight, the pre-carbon deposit processing of catalyzer finished;

    (b) raw material that comprises methyl alcohol or dme contacts with molecular sieve catalyst with coke in described reaction zone, under condition for validity, generate the product that comprises light olefin, leave reaction zone with the molecular sieve catalyst of coke and enter gas-solid separation equipment, 5~

    50% weight of isolated molecular sieve catalyst with coke enter revivifier by the catalyst transport pipeline and contact coke-burning regeneration with regenerating medium, the regenerated catalyst that forms turns back to reaction zone by the catalyst transport pipeline, and agent alcohol scale-up factor is remained between 0.05~

    3;

    Wherein, the mass rate of methyl alcohol in agent alcohol scale-up factor=(molecular sieve mass content in the catalyst recirculation amount * catalyzer in the circulating fluidized bed reaction-regeneration system)/raw material charging;

    Described reactor is fast fluidized bed.

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