Pulp & Paper Bleaching

Application Summary


Pulp & Paper Bleaching


Wood pulp bleaching to attain the desired level of paper whiteness

How It’s Used

Pump bleaching agents into mixing towers to maintain correction solution

Key Feature

Chemical resistant pump materials

End Equipment

Paper pulp bleaching equipment

Pump Function



Hydrogen Peroxide

Flow Rate

50 mL/min (0.79 USG/hr) to 19L/min (300 USG/hr) flow rates

Differential Pressure

<40 psi (<2.76 bar)

Applications Overview

Pulp & Paper Manufacturing Process

The following illustration is an overview of the entire Pulp & Paper manufacturing process. Notice that Micropump pumps have application in three of the process steps. This application brief focuses on the application of Micropump pumps in the Bleaching process step.

Overview of the Pulp & Paper manufacturing process

Application Focus: Bleaching

In the paper manufacturing process, wood pulp leaving the digester wash unit often must be bleached to attain the desired level of paper whiteness. Bleach plants whiten pulp through three to five stages of bleaching and water washing.

Micropump pumps are used in these applications to deliver the appropriate bleaching agent and to maintain the proper chemical balance in the bleaching towers.

Micropump pumps deliver smooth, controlled flow of whitening agents to the bleaching towers.

Performance Summary

This chart indicates optimal operating ranges for recommended products.

Micropump Products Optimized for this Application

Micropump cavity style pumps are commonly used for this application. All pump base materials are 316 SS with PTFE wetted materials.

Cavity Technology

GJ Series


0.316 ml/rev (N21)
0.64 ml/rev (N23)
0.91 ml/rev (N25)
1.23 ml/rev (N27)

Differential Pressure (max):

5.5 bar | 80 psi

System Pressure (max):

21 bar | 300 psi

Cavity Technology

GLH Series


4.6 ml/rev (H21)
6.2 ml/rev (H23)
7.7 ml/rev (H25)

Differential Pressure (max):

8.6 bar | 125 psi

System Pressure (max):

103 bar | 1500 psi

The Micropump Advantage

The unparalleled quality, performance record, reliability and long operating life of Micropump pumps and our extensive engineering expertise make Micropump a vital partner in this demanding market.

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