| (19) |
 |
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(11) |
EP 0 211 558 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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27.05.1987 Bulletin 1987/22 |
| (43) |
Date of publication A2: |
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25.02.1987 Bulletin 1987/09 |
| (22) |
Date of filing: 22.07.1986 |
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| (84) |
Designated Contracting States: |
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AT BE CH DE FR GB IT LI LU NL SE |
| (30) |
Priority: |
26.07.1985 US 759591
|
| (71) |
Applicant: BIODYNE CHEMICALS, INC. |
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() |
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| (72) |
Inventors: |
|
- Baierl, Kenneth W., Sr.
()
- Young, Raymond A.
()
- Young, Timothy R.
()
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| |
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| (54) |
Process for digesting lignocellulosic material |
(57) A process for digesting lignocellulosic material. Lignocellulosic material is introduced
into a digestive zone along with a liquid composed of an ester with an organic lignin
solvent capable of dissolving lignin, and water. The lignocellulosic material is digested
at a temperature of 0°C to 230°C for a period of time sufficient to solubilize the
lignin in the ester and the solvent. The process of the invention reduces the amount
of water in the digestive zone to inhibit the hydrolysis of the cellulose, accelerate
the delignification and provide a more economical chemical recovery system.