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Effect of Magnesium Salts in Peroxide Bleaching of Non-wood Pulps

Dr. Mohammad Safi
Divisional Officer
Pulp and Paper Division, Bangladesh Forest Research Institute Sholashahar, P.O.- Amin Jute Mills Chittagong-4211.

Abstract/ Executive Summary:

This study dealt with the effect of Mg salts in hydrogen peroxide bleaching of jute caddies pulp. It was observed that prior bleaching treatments like chelation and acid washing of pulp were efficient in removing transition metal ions as indicated by lower consumption of hydrogen peroxide compared to untreated pulps. However EDTA chelation seemed better compared to acid washing. The inclusion of Mg salts improved pulp brightness, and the brightness was higher with treated pulps. The pulp viscosity was the highest with 0.3% Mg addition for both treated Kraft and Soda-AQ pulps. Considering both pulp viscosity and pulp brightness, it appeared that a 0.3% Mg dose on EDTA chelated OD pulp, was enough for hydrogen peroxide bleaching of pulps obtained from jute caddies.

Keywords: Jute caddies fibers, Hydrogen peroxide bleaching, Kraft, Magnesium salts and soda-AQ

Location: Pulp and Paper Division, Bangladesh, Bangladesh Forest Research Institute, Chittagong

Start Date: 01-07-2006

End Date: 30-06-2007

Program Area: Postharvest and Agro-processing

Commodity: Tree

Objectives:

To use of newer methods for production of better quality pulp

Methodology:

Researchers have done lot of research with hydrogen peroxide previously, but almost all of them dealt with either hardwood or softwood pulps, and there is not much study with non-wood fibres, especially jute caddies. It is well established that transition metals cause wasteful decomposition of hydrogen peroxide. The free radicals generated during the decomposition degrade carbohydrates resulting in lower viscosity and yield. It has been reported in the literature that sodium silicate and magnesium sulphate combination adsorbs transition metals and decrease their activity. It is, therefore, needed to study the effect of magnesium salts on deactivation of metal ions during peroxide bleaching of non-wood pulps and to optimize the Mg doses for maximum brightness and pulp viscosity.

Source of Information: Report

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 40000

Total Budget (Tk.) : 40000

Achievement/Findings:

Three doses of MgSO_4,7H₂O, such as 0.3%, 0.5%, 1.0% based on OD pulps were used. Considering both pulp brightness and viscosity 0.3% Mg dose on OD chips was enough for hydrogen peroxide bleaching of pulps from jute caddies.

Knowledge Management: Report/Proceedings