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Process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping

a technology of organosolv and solvent, which is applied in pulp properties modification, papermaking, textiles and papermaking, etc., can solve the problems of large mineral waste stream containing harmful components and need relatively high operating pressure, and achieve low pressure and high boiling point

Inactive Publication Date: 2007-02-15
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It has now been found that compounds having a gamma lactone group can very suitably be used as solvent or part of the solvent for organosolv pulping.
[0010] An important advantage of the use of a compound having a gamma lactone group in a solvent for organosolv pulping is that it has a relatively high boiling point and that the organosolv pulping can thus be carried out at a relatively low pressure.

Problems solved by technology

An important drawback of the Kraft pulping process is, however, that a large mineral waste stream comprising harmful components is formed.
A drawback of the use of relatively volatile solvents is therefore that relatively high operating pressures are needed.

Method used

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  • Process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping
  • Process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping
  • Process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping

Examples

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examples

[0037] The process according to the invention will be further illustrated by means of the following non-limiting examples.

examples 1 to 5

[0038] Approximately 4 grams of dried birchwood (Betula ssp.) sawdust having a cellulose content of 49 wt % was weighted into the reactor tube of a plug flow reactor. Solvent was continuously supplied to and discharged from the reactor tube at a liquid hourly velocity of 8 litre per kg wood per hour. The reactor pressure was kept at 4 bar (absolute). During the first hour, the solvent was heated from room temperature to the reaction temperature, then the temperature was maintained for one hour at the reaction temperature and then the solvent was cooled from reaction temperature to room temperature. After cooling, the solvent supply was stopped and acetone was supplied to the reactor to remove remaining liquid from the solid residue. The acetone-washed residue was dried by purging it overnight with nitrogen, removed from the reactor, and weighed.

[0039] During all experiments, a dark liquid fraction was discharged from the reactor tube and the acetone-washed residue obtained, i.e. th...

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Abstract

The invention provides a process for organosolv pulping, wherein solid lignocellulosic feed material is heated at a temperature in the range of from 50 to 210° C. in a solvent to obtain a solid cellulosic fraction comprising at least 50 wt % of the cellulose present in the feed material and a liquid fraction, wherein the solvent comprises at least 10 wt % of a compound according to general molecular formula wherein R1 to R6 each represent, independently, a hydrogen atom or an organic group connected with a carbon atom to the lactone group. The invention further provides the use of a compound according to general molecular formula (1) in a solvent for organosolv pulping.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims priority from European Patent Application No. 05105245.4, filed Jun. 15, 2005, which is incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention provides a process for organosolv pulping and the use of a gamma lactone in a solvent for organosolv pulping. BACKGROUND OF THE INVENTION [0003] The most widely used pulp manufacturing process is the Kraft process. An important drawback of the Kraft pulping process is, however, that a large mineral waste stream comprising harmful components is formed. In order to avoid the formation of mineral waste material, organosolv pulping has been proposed and studied as an alternative for Kraft pulping. In organosolv pulping, lignocellulosic material is heated in a solvent comprising organic compounds and optionally water, in order to dissolve the greater part of the hemicellulose and lignin and to obtain a high-quality, high-molecular weight cellulose ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21C3/20
CPCD21C9/007D21H25/04D21C9/10
Inventor PETRUS, LEONARDUSPETRUS-HOOGENBOSCH, CATHARINA JOHANNA MARIA
Owner SHELL OIL CO
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