Process for the production of phenolic-rich pyrolysis oils for use in making phenol-formaldehyde resole resins
AssigneePyrovac Technologies Inc.
InventorsChristian Roy, Xiao Lu, Hooshang Pakdel
Life of this patent
Estimating the term…
Abstract
A phenolic-rich pyrolysis oil is produced by pyrolysing lignocellulosic material at a temperature of no more than about 550.degree. C under an absolute pressure of no more than about 50 kPa to produce pyrolysis vapors, and condensing the pyrolysis vapors to obtain a condensate consisting of a phenolic-rich pyrolysis oil having a dew point of about 65 to about 75.degree. C. under an absolute pressure of about 15 to about 20 kPa. Such a phenolic-rich pyrolysis can be directly used in making phenol-formaldehyde resol resins.
Claims26
A process for the production of a phenolic-rich pyrolysis oil, which comprises the steps of:
- a) pyrolysing lignocellulosic material at a temperature of no more than about 550.degree. C. under an absolute pressure of no more than about 50 kPa to produce pyrolysis vapors;
- and
- b) condensing the pyrolysis vapors to obtain a condensate consisting of a phenolic-rich pyrolysis oil having a dew point ranging from about 65 to about 75.degree. C. under an absolute pressure of about 15 to about 20 kPa.
A method of purifying a phenolic-rich pyrolysis oil containing high molecular weight carboxylic acids, which comprises the steps of:
- a) extracting said oil with an organic solvent selected from the group consisting of C.sub.5 -C.sub.8 saturated hydrocarbons and petroleum ether to obtain a first fraction comprising a phenolic oil with a minor portion of said high molecular weight carboxylic acids and a second fraction comprising said organic solvent and a major portion of said high molecular weight carboxylic acids dissolved therein, said first and second fractions being immiscible with one another;
- b) separating said first and second fractions from one another;
- and
- c) recovering said first fraction.
A phenolic-rich pyrolysis oil derived from lignocellulosic material and having a dew point ranging from about 65 to about 75.degree. C. under an absolute pressure of about 15 to about 20 kPa.
Dependencies are inferred from the claim text.