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Effect of Anthraquinone in Alkaline Pulping of Acacia Auriculiformis

Dr. A.F.M. Akhtaruzzaman
Divisional Officer
Pulp and paper Division, Bangladesh Forest Research Institute, P.O. Box 273, Chittagong, 4000, Bangladesh.

Mr. P. Das
Research Assistant
Pulp and paper Division, Bangladesh Forest Research Institute, P.O. Box 273, Chittagong, 4000, Bangladesh.

Dr. S. K. Bose
Research Officer
Pulp and paper Division, Bangladesh Forest Research Institute, P.O. Box 273, Chittagong, 4000, Bangladesh.

Abstract/ Executive Summary:

Conventional soda pulping results in lower pulp yield and strength properties. It also needs a much longer cooking time. To overcome these difficulties a study on the effect of anthraquinone (AQ) in the alkaline pulping of Acacia auriculiformis was conducted. The result showed that 3.1 percent point yield gain was achieved in the soda pulping with 0.05% AQ addition. The yield was comparable to that of the kraft control. Further increase of AQ did not substantially increase the yield. In kraft-AQ pulping the gain in yield was less remarkable, although 1.4 percent point gain was obtained. Addition of AQ can substantially reduce the alkali requirement and/ or duration of cooking. The quality of the AQ catalysed pulp was in no way inferior to the kraft control.The feasibility of using AQ in a soda pulp mill in Bangladesh has been shown. It indicates a remarkable economical gain

Keywords: Acacia auriculiformis, Anthraquinone, Alkaline pulping, Sulphidity, Active alkali

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

Start Date:

End Date:

Program Area: Postharvest and Agro-processing

Commodity: Akash moni

Objectives:

To study the effect of anthraquinone (AQ) in the alkaline pulping of Acacia auriculiformis.

Methodology:

Logs of Acacia auriculiformis were collected from roadside plantations along Chittagong-Kaptai road. The debarked logs were chipped in a laboratory chipper machine. The chips were then air dried and sampled for pulping.The chips were pulped by kraft and soda process, with and without AQ, in a 23l rotating digester using indirect heating system. The digester was inuitially heated to a temperature of 80⁰C and then airdried chips equivalent to 2000 g ovendried chips were charged with the chemicals in all the cooks. The effect of AQ on kraft and soda pulping was studied by adding two doses of AQ, viz, 0.05% and0.15% on oven-dried wood. As 14%alkali (as Na₂O) was not sufficient to reach the target kappa value of 20, normal soda control was done at 17% alkali (as Na₂O) charge. In all the cases, cooks were made at three different cooking times to obtain three values of kappa number. Other cooking conditions were maintained at 14% active alkali (as Na₂0), 25% sulphidity (for kraft), 4 : 1 liquor to wood ratio and 90 min to raise the temperature to 170⁰C.At the end of the digestion, the cooked chips were discharged, washed, disintegrated and then screened. The screened pulps were pressed to remove excess water, shredded, weighed and then sampled to determine the moisture content. The screening rejects were also oven-dried. The pulp yield and the screened pulp kappa number were determined. The pulp samples were then refined in a Valley beater to different freeness values and hand sheets were made for determining the strength properties after conditioning at 23 ± 1⁰C and 50 ± 1% resdlative humidity, All the sheets were tested according to Scan Test Methods.

Source of Information: Bano Biggyan Patrica vol. 16 (1&2); 3-9, 1987.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 00

Total Budget (Tk.) : 00

Achievement/Findings:

Based on the findings in this investigation leading to increased yield, less alkali requirement, reduced cooking time, kraft like or better pulp properties, there is a better prospect for using AQ in soda pulp mills. However, its response to the specific raw materials now being used in these mills is warranted. An economic analysis of using AQ in a pulp mill was done. Considering 300 operating days, a pulp mill can make a net annual gain due to AQ addition was TK. 32,398,000/-

Knowledge Management: Journal