Pakistan Sugarcane Decolorization and Refining

1. Project Overview

Pakistan is one of the world’s major sugarcane producers, with an annual output of about 80 million tons. The sugar industry is the cornerstone of Pakistan’s agricultural economy, especially in Punjab and Sindh provinces, which produce about 7 million tons of sugar each year. However, traditional decolorization methods, such as sulfur bleaching, cannot meet the strict color and purity standards of high-quality white sugar and refined sugar (color value < 45 IU) and cause environmental pollution. In 2024, a medium-sized sugar factory near Lahore, Punjab Province (hereinafter referred to as “Lahore Sugar Factory”) launched a technology upgrade project to use powdered activated carbon (PAC) for decolorization to improve product quality and expand export markets. As a trusted supplier, Xinsen Activated Carbon provided high-performance coconut shell-based PAC and technical support to ensure the project’s efficiency and environmental compliance.

2. Challenges and Solutions

Challenges

• Unqualified Product Quality: Traditional sulfur bleaching results in a high color value of sugar (100-150 IU), which does not meet the standards for refined sugar in the EU and Middle East markets.
• Environmental compliance: Sulfur bleaching produces sulfur dioxide emissions, which violates Pakistan’s Environmental Protection Act (amended in 2022).
• Activated carbon selection: The quality of activated carbon available in the market varies, and inferior products pose the risk of poor decolorization or increased costs.
• Cost Management: Small and medium-sized plants need to balance equipment investment and operating costs while ensuring process reliability.

Solution

Lahore Sugar Factory worked with Xinsen Activated Carbon to deploy a customized PAC solution to meet the following challenges:

• High-Performance PAC: Xingsen supplied food-grade coconut shell-based PAC (iodine adsorption value >1000 mg/g, particle size 20-40 microns) for efficient color and impurity removal.

• Eco-Friendly Process: Replaced sulfur bleaching to eliminate harmful emissions, ensuring compliance with environmental regulations.

• Technical Support: Xingsen provided guidance on optimizing PAC dosage and spent carbon regeneration, reducing operational costs.

• Reliable Supply: Xingsen’s Southeast Asian supply chain ensured stable PAC delivery at competitive prices.

3. Implementation Process

Process Design

Lahore Sugar Mill integrated a PAC decolorization unit into its existing sugar production process, with the following steps:

• Raw Sugar Preparation: Sugarcane was crushed, clarified, evaporated, and crystallized to produce raw syrup (color value 2000-3000 IU).
• PAC Addition: Syrup was preheated to 70°C, and Xingsen coconut shell-based PAC was added at 0.5%-1% (w/w).
• Adsorption and Mixing: Syrup and PAC were mixed for 30 minutes in 5000-liter stainless steel tanks to ensure thorough adsorption of colorants and impurities.
• Filtration: A plate-and-frame filter press (5-micron precision) separated the PAC, yielding clear syrup with a color value below 200 IU.
• Refining and Packaging: The clear syrup underwent recrystallization, centrifugation, and drying to produce refined white sugar (color value <45 IU) for export and premium domestic markets.

Equipment and Materials

• Activated Carbon: Xingsen supplied coconut shell-based PAC at approximately $1200 per ton, meeting food safety standards.

• Core Equipment: The mill installed two 5000-liter mixing tanks with variable-frequency agitators and a filter press capable of processing 10 tons of syrup per hour.

• Spent Carbon Management: Xingsen advised on the construction of a thermal regeneration furnace (800°C), achieving a 70% PAC recovery rate, with residual spent carbon used as boiler fuel.

Implementation Phases

• Preparation (January-March 2024): The mill signed a long-term supply contract with Xingsen, completed equipment procurement, and finalized process design.
• Pilot Testing (April-June 2024): Xingsen’s technical team assisted in optimizing PAC dosage, ensuring consistent decolorization results.
• Full Implementation (July 2024 Onward): Full-scale production began, with 20 workers trained by Xingsen and the mill to operate the new process.

4. Results and Impact

Technical Outcomes

• Color Reduction: Refined white sugar color value dropped from 100-150 IU to 30-45 IU, meeting international export standards.

• Impurity removal：Xinsen PAC effectively adsorbs phenolic compounds and colloids, increasing the purity of sugar to 99.9%.

• Process stability：The system processes 300 tons of syrup per day with a filtration efficiency of 98%, maintaining operational reliability.

Economic Benefits

• Increase in Revenue: A 20% price premium on refined sugar (approximately $100 per ton), generating an additional $500,000 in revenue per year.

• Investment Recovery：The $2 million investment in equipment and process upgrades is expected to be recovered through sales of quality products within three years.

• Market Expansion：The factory has entered the Middle East and European markets, and it is expected that exports will increase by 30% in 2024, and 2,000 tons of new orders will be obtained.

Environmental and social impacts

• • Regulatory compliance：The PAC process eliminates sulfur dioxide emissions and complies with Pakistan’s environmental regulations.

  • Resource efficiency: 70% carbon recovery rate can reduce 100 tons of solid waste per year.

  • Community benefits: The project has created 10 new technical jobs and improved the skills of local workers through training.

5. Conclusion

The Lahore Sugar Refinery has revolutionized the way it produces cane sugar by using powdered activated carbon decolorization technology powered by Xinsen Activated Carbon, achieving superior product quality, environmental compliance, and enhanced market competitiveness. Xinsen’s high-quality activated carbon and expertise played a key role in the success of the project and complemented the sugar refinery’s ambitious goals. This case study is a model for Pakistan’s sugar industry, demonstrating the great potential of combining environmentally friendly technologies with reliable activated carbon solutions. Looking ahead, the sugar refinery plans to deepen its cooperation with Xinsen to optimize the activated carbon regeneration process and explore automation technology to further reduce costs.

To learn more about how Xinsen activated carbon can meet your sugar refining needs, please contact us at [email protected].