{"id":6832,"date":"2026-08-17T15:14:11","date_gmt":"2026-08-17T07:14:11","guid":{"rendered":"https:\/\/www.huameicarbon.com\/?p=6832"},"modified":"2026-08-17T15:14:11","modified_gmt":"2026-08-17T07:14:11","slug":"activated-carbon-sugar-decolorization-specifications","status":"publish","type":"post","link":"https:\/\/www.huameicarbon.com\/it\/activated-carbon-sugar-decolorization-specifications\/","title":{"rendered":"Activated Carbon for Sugar Decolorization: Specs & Guide"},"content":{"rendered":"

Powdered activated carbon (PAC) is the most widely used decolorization agent in sugar refining. It removes color bodies, melanoidins, caramel compounds, and polyphenols from raw sugar liquor \u2014 turning dark brown syrup into clear, near-colorless refined sugar below 50 ICUMSA.<\/p>\n

The right carbon spec makes the difference between hitting your target color in one pass and burning through double the dosage. This guide covers what specifications matter, how the process works, and what to put in your RFQ.<\/p>\n

Why Wood-Based PAC for Sugar<\/h2>\n\n\n\n\n\n\n
Carbon type<\/th>\nPore structure<\/th>\nDecolorization<\/th>\nSugar use<\/th>\n<\/tr>\n
Wood-based PAC<\/a><\/td>\nMesopore +<\/p>\n

macropore<\/p>\n

dominant<\/td>\n

\u2705 Excellent<\/p>\n

(large color molecules)<\/td>\n

Industry standard<\/td>\n<\/tr>\n
Coconut shell GAC<\/a><\/td>\nMicropore<\/p>\n

dominant<\/td>\n

\u274c Poor<\/p>\n

(pores too small for<\/p>\n

color bodies)<\/td>\n

Not suitable<\/td>\n<\/tr>\n
Coal-based PAC<\/a><\/td>\nMixed (micro<\/p>\n

+ meso)<\/td>\n

\u26a0\ufe0f Moderate<\/td>\nSometimes used,<\/p>\n

inferior to wood<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"Three<\/p>\n

The chemistry:<\/strong> Sugar color bodies are large organic molecules (MW 500\u201350,000 daltons). They need mesopores (2\u201350 nm) and macropores (>50 nm) to physically fit inside the carbon structure. Wood-based carbon has the highest proportion of these larger pores \u2014 that's why the sugar industry standardized on it decades ago.<\/p>\n

Coconut shell carbon is excellent for water treatment (small molecules like chlorine), but it physically cannot adsorb sugar colorants efficiently. Don't let anyone sell you coconut shell carbon for sugar decolorization \u2014 the chemistry doesn't work.<\/p>\n

Specifications for Sugar-Grade PAC<\/h2>\n

Based on actual refinery requirements for producing refined sugar below 50 ICUMSA:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Parametro<\/th>\nSpecifiche<\/th>\nTest method<\/th>\nWhy it matters<\/th>\n<\/tr>\n
Raw material<\/td>\nWood (hardwood or softwood)<\/td>\n\u2014<\/td>\nDetermines<\/p>\n

pore structure<\/td>\n<\/tr>\n

Form<\/td>\nPowder, 90% passing 325 mesh<\/td>\nASTM D2862<\/td>\nFine particles<\/p>\n

= faster kinetics<\/p>\n

in batch contact<\/td>\n<\/tr>\n

Numero di iodio<\/td>\n\u22651000 mg\/g<\/td>\nASTM D4607<\/td>\nIndicates total adsorption<\/p>\n

capacity<\/td>\n<\/tr>\n

Decolorization capacity<\/td>\n\u226540% (caramel test)<\/td>\nStandard decolorization<\/p>\n

test<\/td>\n

Direct measure<\/p>\n

of color removal ability<\/td>\n<\/tr>\n

Blu di metilene<\/td>\n\u2265200 mg\/g<\/td>\n\u2014<\/td>\nIndicates mesopore volume<\/p>\n

(where color bodies adsorb)<\/td>\n<\/tr>\n

Iron content<\/td>\n\u2264200 ppm<\/td>\n\u2014<\/td>\nHigh iron<\/p>\n

causes discoloration<\/td>\n<\/tr>\n

Food grade<\/td>\nYes<\/td>\nFCC (Food Chemical<\/p>\n

Codex)<\/td>\n

Required for food-contact<\/p>\n

applications<\/td>\n<\/tr>\n

Halal \/ Kosher<\/td>\nCertified (preferred)<\/td>\nThird-party auditor<\/td>\nRequired for export<\/p>\n

to Middle East, Southeast Asia<\/td>\n<\/tr>\n

FDA compliance<\/td>\n21 CFR 240.40<\/td>\n\u2014<\/td>\nUS market<\/p>\n

requirement<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Critical note on decolorization capacity:<\/strong> The \u226540% spec refers to the standard caramel solution test. Actual performance in real sugar liquor depends on your starting color, temperature, contact time, and dosage. A carbon that scores 40% on the bench test will typically achieve 60\u201380% color removal in optimized plant conditions.<\/p>\n

The Decolorization Process<\/h2>\n

Standard Batch Contact Process<\/h3>\n
    \n
  1. Liquor preparation<\/strong> \u2014 Raw sugar dissolved to 60\u201365\u00b0 Brix, heated to 70\u201385\u00b0C<\/li>\n
  2. Carbon dosing<\/strong> \u2014 PAC added at 0.1\u20130.5% w\/w on dry sugar solids (typical: 0.2\u20130.3%)<\/li>\n
  3. Contact time<\/strong> \u2014 20\u201345 minutes with agitation<\/li>\n
  4. Filtration<\/strong> \u2014 Filter press or rotary vacuum filter removes spent carbon<\/li>\n
  5. Polish filtration<\/strong> \u2014 Secondary filtration catches residual carbon fines<\/li>\n
  6. Color check<\/strong> \u2014 Measure ICUMSA color; if above spec, adjust dosage for next batch<\/li>\n<\/ol>\n

    Key Process Parameters<\/h3>\n\n\n\n\n\n\n\n
    Parametro<\/th>\nOptimal range<\/th>\nEffect if too low<\/th>\nEffect if too high<\/th>\n<\/tr>\n
    Temperature<\/td>\n70\u201385\u00b0C<\/td>\nSlow kinetics,<\/p>\n

    poor color removal<\/td>\n

    		Sugar inversion<\/p>\n

    (pH-dependent), energy cost<\/td>\n<\/tr>\n

    Contact time<\/td>\n20\u201345 min<\/td>\nIncomplete adsorption<\/td>\nMinimal improvement<\/p>\n

    after 30 min, wastes<\/p>\n

    throughput<\/td>\n<\/tr>\n

    Dosage (% on DS)<\/td>\n0.2\u20130.3%<\/td>\nInsufficient<\/p>\n

    color removal<\/td>\n

    		Wasted carbon, higher<\/p>\n

    filtration load<\/td>\n<\/tr>\n

    Brix<\/td>\n60\u201365\u00b0<\/td>\nDilute = more<\/p>\n

    volume to process<\/td>\n

    		Viscous = poor<\/p>\n

    carbon-liquor contact<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Dosage economics:<\/strong> At 0.25% dosage on a refinery processing 500 tons\/day of raw sugar, carbon consumption is approximately 1.25 tons\/day = 37.5 tons\/month. At $1,200\u20131,800\/ton for food-grade wood PAC, that's $45,000\u201367,500\/month in carbon cost alone. Getting the spec right (higher decolorization capacity) directly reduces dosage and cost.<\/p>\n

    ICUMSA Color Targets<\/h2>\n\n\n\n\n\n\n\n
    Sugar grade<\/th>\nICUMSA color<\/th>\nTypical application<\/th>\n<\/tr>\n
    Refined white (EU standard)<\/td>\n<45 IU<\/td>\nEuropean retail, food manufacturing<\/td>\n<\/tr>\n
    Refined white (general)<\/td>\n<80 IU<\/td>\nMost global markets<\/td>\n<\/tr>\n
    Plantation white<\/td>\n100\u2013300 IU<\/td>\nDirect consumption sugar (less refined)<\/td>\n<\/tr>\n
    Raw sugar<\/td>\n600\u20132000 IU<\/td>\nStarting material for refineries<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    To achieve <50 ICUMSA from typical raw sugar (1000\u20131500 IU):<\/strong> You need 85\u201395% total color removal across all refining steps. Activated carbon handles the final polishing \u2014 typically taking color from 150\u2013300 IU (after liming\/carbonatation) down to below 50 IU.<\/p>\n

    PAC vs. GAC vs. Bone Char for Sugar<\/h2>\n\n\n\n\n\n\n\n
    Method<\/th>\nColor removal<\/th>\nRegenerable?<\/th>\nFood grade<\/th>\nCost efficiency<\/th>\n<\/tr>\n
    Wood-based PAC<\/td>\nExcellent<\/td>\nNo (single-use)<\/td>\nYes<\/td>\nBest for batch<\/p>\n

    operations<\/td>\n<\/tr>\n

    GAC columns<\/td>\nGood<\/td>\nYes (thermal)<\/td>\nYes<\/td>\nBetter for continuous<\/p>\n

    high-volume<\/td>\n<\/tr>\n

    Bone char<\/td>\nExcellent<\/td>\nYes (thermal)<\/td>\nCertification complex<\/td>\nTraditional method, declining use<\/td>\n<\/tr>\n
    Ion exchange resin<\/td>\nVery good<\/td>\nYes (chemical)<\/td>\nYes<\/td>\nHighest capital<\/p>\n

    cost, best for<\/p>\n

    very high volume<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Why most refineries use PAC:<\/strong> Lower capital cost (no columns or regeneration equipment), flexible dosing per batch, and simpler quality control. GAC columns are gaining ground in large-scale operations (>1000 tons\/day) where regeneration economics work, but PAC remains the standard for most sugar mills.<\/p>\n

    What to Specify in Your RFQ<\/h2>\n

    When sourcing sugar-grade PAC, your specification sheet should include:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    Item<\/th>\nRequirement<\/th>\n<\/tr>\n
    Raw material<\/td>\nWood-based (phosphoric acid activated)<\/td>\n<\/tr>\n
    Particle size<\/td>\n90% min passing 325 mesh (45 \u00b5m)<\/td>\n<\/tr>\n
    Numero di iodio<\/td>\n\u22651000 mg\/g<\/td>\n<\/tr>\n
    Decolorization<\/td>\n\u226540% (caramel standard)<\/td>\n<\/tr>\n
    Blu di metilene<\/td>\n\u2265200 mg\/g<\/td>\n<\/tr>\n
    Iron<\/td>\n\u2264200 ppm<\/td>\n<\/tr>\n
    Heavy metals (Pb)<\/td>\n\u22642 ppm<\/td>\n<\/tr>\n
    Arsenic<\/td>\n\u22641 ppm<\/td>\n<\/tr>\n
    Food grade certification<\/td>\nFCC compliant<\/td>\n<\/tr>\n
    Halal \/ Kosher<\/td>\nCertificate required<\/td>\n<\/tr>\n
    Imballaggio<\/td>\n25kg bags or 500kg jumbo bags<\/td>\n<\/tr>\n
    Test report<\/td>\nCOA per batch with all above parameters<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Wood-based powder activated carbon product specifications \u2192<\/a><\/p>\n

    Troubleshooting: Why Color Won't Come Down<\/h2>\n\n\n\n\n\n\n\n\n
    Problem<\/th>\nLikely cause<\/th>\nSolution<\/th>\n<\/tr>\n
    Color stuck at<\/p>\n

    80\u2013100 IU despite<\/p>\n

    high dosage<\/td>\n

    		Carbon mesopore<\/p>\n

    volume too low<\/p>\n

    (wrong spec)<\/td>\n

    		Switch to higher<\/p>\n

    MB value carbon (\u2265220 mg\/g)<\/td>\n<\/tr>\n

    Color fluctuates<\/p>\n

    batch to batch<\/td>\n

    		Inconsistent raw<\/p>\n

    sugar quality<\/td>\n

    		Adjust dosage per<\/p>\n

    batch based on<\/p>\n

    inlet color<\/td>\n<\/tr>\n

    Good color but<\/p>\n

    high ash in product<\/td>\n

    		Carbon ash too high, minerals dissolving<\/td>\nSpecify ash \u22643%,<\/p>\n

    or acid-washed grade<\/td>\n<\/tr>\n

    Filter blinding<\/p>\n

    \/ slow filtration<\/td>\n

    		Carbon too fine<\/p>\n

    or poor quality fines<\/td>\n

    		Check PSD;<\/p>\n

    specify \u22645% below 10 \u00b5m<\/td>\n<\/tr>\n

    Color rebound<\/p>\n

    after storage<\/td>\n

    		Incomplete removal<\/p>\n

    of precursors<\/td>\n

    		Increase contact<\/p>\n

    time or add second<\/p>\n

    carbon stage<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    FAQ<\/h2>\n

    How much activated carbon is needed per ton of sugar?<\/h3>\n

    Typical dosage is 2\u20135 kg of PAC per ton of raw sugar (0.2\u20130.5% on dry solids). The exact amount depends on starting color, target ICUMSA, and carbon quality. Higher-spec carbon (decolorization \u226540%, iodine \u22651000) requires less dosage to achieve the same result. Most refineries producing <50 ICUMSA refined sugar use 2.5\u20133.5 kg\/ton with quality wood-based PAC.<\/p>\n

    Can coconut shell activated carbon be used for sugar decolorization?<\/h3>\n

    No \u2014 not effectively. Sugar color bodies are large molecules (MW 500\u201350,000) that require mesopores and macropores for adsorption. Coconut shell carbon is micropore-dominant and physically cannot accommodate these large colorants. Wood-based PAC with its open mesopore\/macropore structure is the correct choice. This is basic adsorption science, not a marketing preference.<\/p>\n

    What is the difference between food-grade and industrial-grade activated carbon?<\/h3>\n

    Food-grade activated carbon must comply with Food Chemical Codex (FCC) standards, including strict limits on heavy metals (lead \u22642 ppm, arsenic \u22641 ppm), iron content (\u2264200 ppm), and must pass extractable matter tests. Industrial-grade carbon has no such limits and may leach contaminants into food products. For sugar refining, only food-grade carbon should be used. Halal and Kosher certifications are additionally required for export to many markets.<\/p>\n

    Does activated carbon remove minerals or nutrients from sugar?<\/h3>\n

    Activated carbon is selective for organic color compounds and does not significantly remove sucrose, minerals, or basic sugar components at normal operating conditions. The adsorption is driven by the hydrophobic nature of color bodies \u2014 sucrose molecules (small, polar) have very low affinity for the carbon surface. You will not lose sugar yield due to carbon treatment.<\/p>\n

    How do I verify carbon quality before purchasing large quantities?<\/h3>\n

    Request a 25kg sample with COA. Run a bench-scale decolorization test: dissolve raw sugar to 60\u00b0 Brix, add carbon at 0.3% on DS, hold at 80\u00b0C for 30 minutes with stirring, filter through Whatman 42 paper, and measure color with a spectrophotometer at 420nm. Compare results against your current carbon supplier. If the new carbon achieves equal or better decolorization at the same or lower dosage, it qualifies.<\/p>\n

    Food-grade wood-based PAC for sugar refining \u2014 iodine 1000+, decolorization \u226540%, FCC compliant, Halal\/Kosher available. WhatsApp: +86 181-3792-7803<\/a> | Request specification sheet \u2192<\/a><\/em><\/p>","protected":false},"excerpt":{"rendered":"

    Wood-based powder activated carbon specifications for sugar refining to achieve below 50 ICUMSA. Covers why wood-based PAC is the industry standard (mesopore chemistry), full spec table (iodine 1000+, decolorization \u226540%, food grade, Halal\/Kosher), batch process parameters, dosage economics, ICUMSA targets, PAC vs GAC vs bone char comparison, RFQ checklist, and troubleshooting guide for color removal problems.<\/p>","protected":false},"author":2,"featured_media":6838,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"Activated Carbon for Sugar Decolorization: Specs & Guide","_seopress_titles_desc":"Wood-based powder activated carbon for sugar refining. Iodine 1000+, decolorization \u226540%, food grade. Achieve below 50 ICUMSA color in refined sugar.","_seopress_robots_index":"","footnotes":""},"categories":[1,92],"tags":[137,140,139,99,136,138],"class_list":["post-6832","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-buyers-guide","tag-activated-carbon-sugar-refining","tag-food-grade-activated-carbon","tag-icumsa-color","tag-powdered-activated-carbon","tag-sugar-decolorization","tag-wood-based-activated-carbon"],"_links":{"self":[{"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/posts\/6832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/comments?post=6832"}],"version-history":[{"count":0,"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/posts\/6832\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/media\/6838"}],"wp:attachment":[{"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/media?parent=6832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/categories?post=6832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.huameicarbon.com\/it\/wp-json\/wp\/v2\/tags?post=6832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}