Unlock instant, AI-driven research and patent intelligence for your innovation.

A process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping

A technology of organic dissolution and solvent, which is applied in the fields of pulping with organic solvents, pulping of cellulose raw materials, pulp bleaching, etc., and can solve problems such as high operating pressure

Inactive Publication Date: 2008-06-11
SHELL INT RES MAATSCHAPPIJ BV
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using relatively volatile solvents is the need for relatively high operating pressures

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping
  • A process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping
  • A process for organosolv pulping and use of a gamma lactone in a solvent for organosolv pulping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0042] About 4 grams of dry birch (Betulas sp.) sawdust having a cellulose content of 49 wt % was weighed into the reactor tube of the plug flow reactor. Solvent was continuously passed into and removed from the reactor tubes at a liquid hourly rate of 8 liters per kilogram of wood per hour. The reactor pressure was maintained at 4 bar (absolute). During the first hour, the solvent was heated from room temperature to the reaction temperature, then the temperature was maintained at the reaction temperature for 1 hour, and then the solvent was cooled from the reaction temperature to room temperature. After cooling, the solvent flow was stopped and acetone was passed through the reactor to remove residual liquid from the solid residue. The acetone washed residue was purged with nitrogen overnight to dry it, removed from the reactor and weighed.

[0043] During all experiments, a dark liquid fraction was drained from the reactor tube, and the resulting acetone washed residue, ie...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
degree of polymerizationaaaaaaaaaa
degree of polymerizationaaaaaaaaaa
Login to View More

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 DEG 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 (1) 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

field of invention [0001] The present invention provides a method for organic dissolution pulping and the use of gamma lactone in a solvent for organic dissolution pulping. Background of the invention [0002] The most widely used pulp manufacturing process is the Kraft process. However, an important disadvantage of the Kraft pulping process is the generation of large amounts of inorganic waste streams including harmful components. To avoid the generation of inorganic waste, organic dissolution pulping has been proposed and investigated as an alternative to Kraft pulping. In organic dissolving pulping, lignocellulosic material is heated in a solvent comprising organic compounds and optionally water to dissolve a greater portion of the hemicellulose and lignin and to obtain a high quality, high molecular weight material suitable for papermaking. of cellulose. The solvent is separated for recycling from dissolved hemicellulose and lignin by simple distillation. Well-known ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/20D21C3/22
CPCD21C9/10D21H25/04D21C9/007
Inventor L·彼得鲁斯(已死亡)
Owner SHELL INT RES MAATSCHAPPIJ BV