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Anhydrous Citric Acid

Anhydrous Citric Acid
CAS No.: 77-92-9
Molecular Formula: C6H8O7
Molecular weight: 192.12
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Product Introduction

Anhydrous Citric Acid, with the chemical formula C₆H₈O₇, is a colorless crystalline solid. It is odorless, has a sour taste, highly soluble in water and ethanol, and is widely used in food, pharmaceutical and cosmetic industries.


CHEMICAL PROPERTIES

PropertyValue
Melting Point153-159 °C (lit.)
Boiling Point310 °C (decomp)
Bulk Density560 kg/m³
Density1.67 g/cm³ at 20 °C
Vapor Pressure (vs air)7.26 (vs air)
Vapor Pressure<0.1 hPa (20 °C)
Refractive Index1.493~1.509
FEMA2306/CITRIC ACID
Flash Point100 °C
Storage Conditions2-8°C
SolubilityAt 15°C, citric acid is also soluble in anhydrous (absolute) ethanol (76 parts citric acid per 100 parts ethanol).
FormWhite powder
Acid Dissociation Constant (pKa)3.14 (at 20°C)
ColorWhite
OdorOdorless
pH Value3.24 (1 mM solution); 2.62 (10 mM solution); 2.08 (100 mM solution)
Explosive Limit8%, 65°F
ToxicityOdorless
Biological SourceSynthetic
Water SolubilitySoluble in water (1174 g/L at 10°C, 1809 g/L at 30°C, 3825 g/L at 80°C).
Wavelength Maximum (λ_max)λ: 260 nm Amax: 0.20
λ: 280 nm Amax: 0.10
SensitivityHygroscopic
Merck14,2326
JECFA Number218
BRN782061
Henry's Law Constant3.1×10¹⁵ mol/(m³Pa) at 25°C, Burkholder et al. (2019)
StabilityStable. Incompatible with bases, strong oxidizing agents, reducing agents, metal oxides.
Cosmetic Ingredient FunctionsCHELATING, FRAGRANCE, BUFFERING
Cosmetic Ingredient AssessmentCitric acid (77-92-9)
InChI1S/C6H8O7/c7-3(8)1-6(13,5(11)12)2-4(9)10/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12)
InChIKeyKRKNYBCHXYNGOX-UHFFFAOYSA-N
SMILESOC(=O)CC(O)(CC(O)=O)C(O)=O
LogP-1.64
CAS Database77-92-9 (CAS DataBase Reference)
NIST Chemical Substances Information1,2,3-Propanetricarboxylic acid, 2-hydroxy- (77-92-9)
EPA Chemical Substances InformationCitric acid (77-92-9)


SAFETY INFORMATION

PropertyValue
Hazard SymbolsXi, C, T
Hazard Class Codes41-36/37/38-36/38-37/38-34-36-35-61-60
Safety Description Codes26-39-37/39-24/25-36/37/39-45-36-53
UN Transport NumberUN 1789 8/PG 3
WGK Germany1
RTECS NumberGE7350000
F9
TSCATSCA listed
HS Code2918 14 00
Storage Class11 - Combustible solids
Hazard ClassEye Irritant Category 2
Specific Target Organ Toxicity - Single Exposure, Category 3
Hazardous Substances Data77-92-9 (Hazardous Substances Data)
ToxicityLD50 in mice, rats (mmol/kg): 5.0, 4.6 i.p. (Gruber, Halbeisen)


PRODUCT USAGE
Anhydrous citric acid is the water-free form of citric acid, appearing as a white, crystalline powder with a strong acidic taste. Its lack of water molecules provides enhanced stability and precise moisture control, making it suitable for a wide range of applications :

Food & Beverage Industry: Used as an acidulant, preservative, and flavor enhancer in soft drinks, candies, jams, sauces, and canned foods (E330). It provides tartness, controls pH, inhibits microbial growth, and acts as a chelating agent to prevent discoloration .

Pharmaceuticals & Nutraceuticals: Serves as a pH modifier, effervescent component (reacts with bicarbonates for rapid dissolution), and stabilizer in tablets, syrups, effervescent powders, and vitamin supplements. It also improves taste and enhances solubility .

Cosmetics & Personal Care: Functions as a pH adjuster, exfoliant, and chelating agent in skincare products, shampoos, conditioners, soaps, and bath products. It improves preservative efficacy by binding metal ions.

Household & Industrial Cleaning: Effective descaling agent for removing limescale, rust, and mineral deposits from kettles, coffee makers, dishwashers, and bathroom fixtures. Also used in detergents, metal cleaners, and dishwasher tablets as a biodegradable alternative to harsh acids .

Water Treatment & Technical Applications: Employed as a chelating and pH control agent in water treatment, preventing scaling and corrosion in boilers and cooling towers. Also used in textile processing, electroplating, and chemical synthesis .

Laboratory & Biochemical Research: Used in buffer preparation, as a chelating agent, and in tissue culture systems .

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FAQ

Q: Are you a factory or a trading company?

A: We are a company integrating manufacturing and trading.

Q: Can you provide samples for testing before mass production?

A: Of course. We can send you samples free of charge, and we also include a COA. However, you will be responsible for the shipping fee.

Q: How can I get an accurate quote?

A: Please provide the exact product specifications, particle size, color, and intended use, and we will provide you with an accurate quote.

Q: Can you provide a COA?

A: Of course, but only for standard products. If you require an accurate COA, we will produce and test samples before providing you with an accurate COA.

Q: Do you accept ODM or OEM services?

A: Yes, we offer customized services for ingredients, packaging, and labeling. We have strong design capabilities. Please contact us to design your own brand.

Q: Can I visit your factory before placing a large order?

A: Of course. We welcome you at any time.

Q: What is the loading port?

A: Usually Qingdao or Tianjin.

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