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Soda Sulphur Pulping of Mandar for Manufacturing Writing and Printing Paper

Md. Sirajul Karim
Department of Chemistry, Bangladesh Agricultural University, Mymensingh

Md. Habibur Rahman Talukder
Department of Chemistry, Gouripur Government College, Mymensingh

Abstract/ Executive Summary:

Chips of mandar were subjected to pulping in the laboratory using soda–sulphur process and for that optimum conditions were established on the basis of yield and permanganate number and freeness of the pulp and breaking length, tear factor, burst factor and brightness of the unbleached pulp-sheets. The pulps were then bleached and the above properties for both bleached pulp and pulp-sheets were also determined and reported. It has been found that good quality writing and printing paper can be obtained from the wood of mandar tree through soda sulphur pulping process followed by subsequent bleaching of the pulps using conventional 3 and 5 stage systems.

Keywords: Soda sulphur, Mandar, Paper pulp

Location: Department of Chemistry, Bangladesh Agricultural University, Mymensingh

Start Date: 00-11-2007

End Date: 00-04-2008

Program Area: Knowledge Management

Non-commodity: Performance

Objectives:

1. As there is no report of making pulp and paper from mandar by soda sulphur process in literature, so the present studies were made in details.

Methodology:

For each experiment 500 g. o.d. chips of mandar were used in rotating closed digestor of 20 L capacity. The temperature rose with the rise of pressure and vice versa. At the end of cooking of each experiment the pulp was washed thoroughly with water. Optimum pulping conditions were established by varying the percentage of caustic soda and elemental sulphur as well as time, temperature and material-liquor ratio and for that careful determinations for unbleached pulp-yield and permanganate number of the pulp were mad. The paper properties of the unbleached pulp-sheets were also determined. Pulps thus obtained with the optimum pulping conditions were then bleached with 3 stage CEH and 5 stage CEHEH bleaching systems where C is meant for chlorination, E for caustic extraction and H for sodium hypochlorite treatment. Chlorination was applied for an hour at 3.5% consistency at room temperature at pH 1–2. Caustic extraction (2%) was made for an hour at 13.5% consistency at pH 12–13. The extraction was continued at a temperature of 70-80oC. The duration of hypochlorite was also for 60 minutes at pH 9–11. All other conditions of hypochlorite treatment remained same as those of chlorination. In case of 3 stage CEH bleaching, 60% chlorine was used and the rest 40% chlorine was used at the end of 3rd stage from hypochlorite solution. The distribution of chlorine for 5 stages CEHEH bleaching system was 60%, 20% and 20% respectively for chlorination, 1st and 2nd hypochlorite treatments. Pulps, before and after bleaching, were disintegrated and beaten in a Hollander beater by TAPPI procedures for a period of 0 to 60 minutes and samples of pulp-slurry were collected at 0, 10, 20, 30, 40, 50 and 60 minutes and pulp-sheets were made and tested for paper properties like breaking length, tear factor, burst factor and brightness. The freeness of both unbleached and 3 stage and 5 stage bleached pulps were also determined.

Source of Information: J. Agrofor. Environ. 2(2): 27-31, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It has been found that good quality writing and printing paper can be obtained from the wood of mandar tree through soda sulphur pulping process followed by subsequent bleaching of the pulps using conventional 3 and 5 stage systems.

Knowledge Management: Journal