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Anhydrous citric acid is an acidic compound that does not contain crystal water, with a chemical formula of C₆H₈O₇, a molecular weight of 192.13, and a CAS number of 5949-29-1. Its non-hygroscopicity, high solubility, and strong acid effect make it an irreplaceable core raw material in the fields of food, medicine, industry, and environmental protection.
【Anhydrous Citric Acid – High-Purity Multi-Scenario Acid Control Expert】
Core Attributes & Performance Advantages▸ Chemical Composition: C₆H₈O₇ (anhydrous), CAS 5949-29-1, white crystalline powder, non-hygroscopic, easy to store.
▸ Strong Acidity: pH 2.2–2.8 (15% higher acidity than monohydrate citric acid), rapid penetration for superior cleaning and preservation.
▸ Fast Solubility: Dissolves in cold water within 30 seconds, stable under high temperatures, ideal for spray drying and sterilization.
▸ Chelating Power: 20% higher metal ion chelation efficiency, extending equipment lifespan (e.g., boilers, pipelines).
▸ Safety: FDA/EFSA certified, heavy metals <0.1ppm, biodegradability >98%.
vs. Monohydrate Citric Acid & Sodium Citrate – Key Differences
| Comparison Criteria | Anhydrous Citric Acid | Monohydrate Citric Acid | Sodium Citrate |
|---|---|---|---|
| Form | No crystalline water, higher purity | Contains 1 water molecule | Sodium salt, pH buffering |
| Solubility | Cold water solubility in 30 sec | Requires 2 minutes heating | Needs heating for dissolution |
| Thermal Stability | Stable above 150°C | Decomposes at 120°C | Heat-resistant but hygroscopic |
| Applications | High-temperature processes, pharma, semiconductor cleaning | Food & beverages, general cleaning | Water treatment, pH adjustment |
| Chelation Efficiency | 20% higher metal ion removal | Standard chelation | Relies on sodium synergy |
Core Application Scenarios & Customer Value
1. Industrial Manufacturing
Semiconductor Cleaning:
Scenario: Wafer deionized water system descaling, photoresist removal.
Value: Non-residue property ensures ionic residue <1ppb, increasing chip yield by 18%; withstands high temperatures (150°C), compatible with lithography processes.
Metal Pickling & Corrosion Prevention:
Scenario: Stainless steel/aluminum pipeline derusting and surface passivation.
Value: 1:8 ratio achieves 95% derusting efficiency, non-corrosive; replaces hydrochloric acid, reducing safety risks and environmental costs.
Circulating Water Treatment:
Scenario: Scale inhibition in power plant/chemical plant cooling systems.
Value: Enhanced calcium/magnesium ion chelation capacity (+20%), scale inhibition rate >90%, reducing downtime maintenance by 50%.
2. Pharmaceuticals & Healthcare
Drug Formulations:
Scenario: Sustained-release tablet matrix, injection pH adjuster.
Value: Fully dissolves in 3 minutes (vs. 5 minutes for monohydrate), high stability, USP-NF certified, sterile production.
Nutritional Supplements:
Scenario: Calcium/phosphorus absorption enhancer, vitamin C composite formulas.
Value: Natural acidic environment boosts active ingredient stability, enhancing bioavailability by 15%.
3. Food & Personal Care
Baking & Meat Processing:
Scenario: Cake leavening agent (replaces baking powder), meat tenderizer.
Value: Increases cake volume by 20%, reduces muscle fiber shear force by 30%, yielding tenderer meat.
Cleaning & Personal Care:
Scenario: Laundry detergent booster, hand sanitizer pH balance.
Value: Enhances cleaning efficiency by 40% in cold water, saving 15% hot water usage; synergizes with benzalkonium chloride for gentle sterilization.
4. Environmental Protection & Agriculture
Flue Gas Desulfurization:
Scenario: SO₂ treatment in coal-fired power plants.
Value: SO₂ absorption rate >92%, recyclable gypsum byproduct reduces environmental costs by 20%.
Soil Remediation & Fertilizers:
Scenario: Acidic soil neutralization, foliar fertilizer micronutrient chelation.
Value: Adjusts pH to 6.5–7.0, mitigates aluminum toxicity; enhances crop calcium/magnesium uptake, boosting yields by 12%–15%.
5. Emerging Fields
E-cigarette Liquids:
Scenario: pH adjustment and flavor optimization in e-liquids.
Value: Replaces sodium citrate, delivers natural tartness, improving user acceptance.
Lithium Battery Electrolytes:
Scenario: pH control in high-nickel battery electrolytes.
Value: Inhibits metal dendrite growth, extending cycle life by 15% and enhancing safety.
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