Patent · US Active

Method and arrangement for adding treatment liquors to cellulose raw material in a continuous process using down flow vessels

US8801898B2 · kind B2 · utility

0Cited by

3References

2Claims

0Family size

Assignee

VALMET AB · SE

Inventors

Daniel Trolin · Karlstad, SE
Fredrik Wilgotson · Sundsvall, SE
Peter Henricsson · Lund, SE

Key dates

Filing date	Aug 19, 2009
Grant date	Aug 12, 2014
Priority date	—
Expiry date	Nov 30, 2029

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD21C7/00
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

The method and arrangement is for adding treatment liquor to comminuted cellulose material, preferably wood chips, during the manufacture of chemical pulp in a continuous process. The process uses a down-flow vessel where chips are descending down the vessel in a plug-flow and where treated chips are continuously fed out at the bottom of the vessel. By arranging more than two parallel pipes offset from the center of the vessel a better distribution of treatment liquor is obtained. Any disturbance of the chip plug flow descending down the vessel is reduced to a minimum.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.