Method for monitoring organic deposits in papermaking

a technology of organic deposits and papermaking, applied in the field of papermaking, can solve the problems of troublesome deposits on all mill equipment, formation of organic deposits, and material becoming both undesirable components of papermaking furnishing, and affecting the production process, so as to reduce the deposition of organic deposits

Inactive Publication Date: 2012-03-29
NALCO CO
View PDF6 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The present invention also provides for a method for measuring the effectiveness of inhibitors (biocides in case of microbiological deposits) that decrease the deposition of organic deposits in a papermaking process comprising monitoring the deposition of organic deposits from a liquid or slurry in a papermaking process comprising measuring the rate of deposition of organic deposits f

Problems solved by technology

Formation of deposits of organic substances (wood extractives and related natural materials in virgin raw material, stickies, wax and microbiological components in recycled material) is a common problem in papermaking.
For paper grades, these materials can become both undesirable components of papermaking furnishes and troublesome deposits on all mill equipment.
In absence of adequate chemical control, they form simultaneously with microbiological deposits.
Thereby, their deposition during the production process is a quite complex matter due to these many possible potential causes.
Currently, there is no such method in the market.

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
  • Method for monitoring organic deposits in papermaking
  • Method for monitoring organic deposits in papermaking
  • Method for monitoring organic deposits in papermaking

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040]The IDM instrument was directly connected (a slipstream connection) to a filtrate line to assure a continuous flow of the solution. The deposition was directly recorded and the data is embodied in FIG. 1. Formation of “light” organic deposits in a post-oxygen brownstock washer line was monitored on-line with the IDM. Steady mass accumulation was observed. In several experiments, the addition of Nalco chemical PP10-3095 led to deposit removal followed by complete suppression of deposition (100-50 ppm) or slowing the deposition down (25 ppm).

example 2

[0041]The IDM instrument was directly connected (a slipstream arrangement) to the white water line in the paper machine (0.3-0.5% pulp fines). The deposition of wood resins and glued fines was directly recorded and the data is embodied in FIG. 2. The deposition stopped when Nalco chemical PP10-3095 was applied at 100 ppm (note that the chemical did not remove the material from the surface of the QCM).

example 3

[0042]The IDM instrument was directly connected (a slipstream arrangement) to the white water line in the paper machine (0.3-0.5% pulp fines). The deposition of wood resins and glued fines was recorded and the data is embodied in FIG. 3. The deposition stopped when Nalco chemical PP10-3095 was applied at 50 ppm and 100 ppm (the chemical did not remove pitch from the surface of the QCM).

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

No PUM Login to View More

Abstract

A method for monitoring the deposition of organic deposits from a liquid or slurry in a papermaking process is disclosed. Also disclosed is a method for measuring the effectiveness of inhibitors that decrease the deposition of organic deposits in a papermaking process. The method may involve monitoring the deposition of organic deposits of a liquid or slurry that simulates the conditions of a papermaking process. The methods may comprise the steps of monitoring the rate of deposition of organic deposits; adding an inhibitor that decreases the deposition of organic deposits from the liquid or slurry; and optionally re-measuring the rate of deposition of organic deposits from the liquid or slurry onto the quartz crystal microbalance, with the rates of deposition determined by measuring the vibration frequency of the quartz crystal microbalance.

Description

[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 11 / 148,639, filed Jun. 9, 2005, which is herein incorporated by reference.FIELD OF THE INVENTION[0002]This invention is in the field of papermaking. Specifically, this invention is in the field of monitoring organic deposit formation in a papermaking process.BACKGROUND OF THE INVENTION[0003]Formation of deposits of organic substances (wood extractives and related natural materials in virgin raw material, stickies, wax and microbiological components in recycled material) is a common problem in papermaking. For paper grades, these materials can become both undesirable components of papermaking furnishes and troublesome deposits on all mill equipment.[0004]The nature of the organic deposits differs from process to process and from mill to mill. Most often, they are mixtures of organic insoluble salts, unsaponifiable organics, wood fibers and / or poorly soluble polymeric paper additives. In absence of ad...

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
IPC IPC(8): D21F13/00
CPCG01N29/022G01N29/036G01N33/343G01N2291/0426G01N2291/0256G01N2291/0258G01N2291/02416
InventorDUGGIRALA, PRASADSHEYCHENKO, SERGEY
OwnerNALCO CO