Method for preparing biological diesel oil with series double-fixed bed and catalysis of solid catalyst

Method for preparing biological diesel oil with series double-fixed bed and catalysis of solid catalyst

  • CN 101,314,719 B
  • Filed: 07/09/2008
  • Issued: 09/25/2013
  • Est. Priority Date: 07/09/2008
  • Status: Active Grant
First Claim
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1. the method for a preparing biological diesel oil with series double-fixed bed and catalysis of solid catalyst is characterized in that this method may further comprise the steps:

  • A. stock oil and low-carbon alcohol are contained in the different containers, are pumped into respectively in the preheater in proportion by two volume pumps, the stock oil that pumps into and the mole ratio of low-carbon alcohol are 1;

    3 ~ 16,B. stock oil with enter the fixed bed of loading solid acid catalyst after low-carbon alcohol is mixed by the preheater preheating, heterogeneous reaction takes place, thereby makes free fatty acids esterification in the stock oil reduce the acid number of stock oil;

    Temperature of reaction control exists;

    50 ℃

    ~ 180 ℃

    , the corresponding control of reaction pressure exists;

    0.1Mp ~ 2Mp,C. enter the fixed bed of loading solid base catalyst through the pretreated raw material of step b, obtain biofuel and the glycerol mixture that major ingredient is fatty acid methyl ester thereby transesterification reaction takes place;

    Temperature of reaction control exists;

    50 ℃

    ~ 180 ℃

    , the corresponding control of reaction pressure exists;

    0.1Mp ~ 2Mp,D. utilize the different of the not mutual solubility of biofuel and glycerine and density, standing demix is told glycerine in container, then direct biofuel and part methyl alcohol with the upper strata is pumped in the separation column by volume pump, boiling-point difference by its material is pressed separation unusually, can get following material behind condenser;

    the cat head discharging is the remaining low-carbon alcohol in reaction back, purer product biofuel is flowed out by the tower middle part collects, and tower bottom is collected unreacted grease or high boiling other impurity;

    The low-carbon alcohol of cat head discharging directly passes back into cycling and reutilization in the raw material storage container, and separation column bottom is collected unreacted grease or high boiling other impurity and carried out recycling after the removal of impurities.

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