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| HS Code | 711223 |
| Product Name | Industrial Grade Lactic Acid |
| Chemical Formula | C3H6O3 |
| Cas Number | 50-21-5 |
| Molecular Weight | 90.08 g/mol |
| Appearance | Colorless to slightly yellow syrupy liquid |
| Odor | Mild, characteristic odor |
| Concentration | 50-90% aqueous solution typical for industrial grade |
| Density | Approximately 1.2 g/cm3 at 20°C |
| Melting Point | Approximately 16.8°C (pure lactic acid) |
| Boiling Point | Decomposes before boiling; distillable only under reduced pressure |
| Water Solubility | Fully miscible in water |
| Pka | 3.76 at 25°C |
| Optical Activity | Exists as L, D, or racemic DL forms depending on production route |
As an accredited Industrial Grade Lactic Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Industrial Grade Lactic Acid is supplied in 25 kg HDPE drums, securely sealed, clearly labeled with hazard information for safe handling and transport. |
| Container Loading (20′ FCL) | 20' FCL loaded with palletized drums/IBCs, securely braced and labeled. Industrial-grade lactic acid container loading ensures safe, stable transport. |
| Shipping | Industrial Grade Lactic Acid ships as a non-hazardous but corrosive liquid in lined drums, IBC totes, or bulk tankers. Ensure proper labeling, segregation from alkalis and oxidizers, and temperature-controlled storage. Use certified carriers familiar with chemical transport and provide documentation complying with local and international regulations. |
| Storage | Store Industrial Grade Lactic Acid in tightly sealed, corrosion-resistant containers (e.g., stainless steel or suitable plastic) in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat, moisture, strong oxidizers, and alkaline materials. Inspect containers regularly for leaks or damage, and follow all local storage regulations. |
| Shelf Life | Shelf life is typically 12 months when stored in sealed containers, away from heat, moisture, and light. |
| Parameter | Method / standard | Gate limit for pre-polycondensation | Observed failure mode |
|---|---|---|---|
| Total water | ASTM E203-16 volumetric Karl Fischer | 12–20 wt% as delivered; <0.1 wt% after pre-drying | Extends oligomerization time; hydrolyzes lactide during ring-opening |
| Sulfated ash | ISO 3451-1:2019 | ≤0.5 wt% | Catalyst deactivation; melt discoloration |
| Reducing sugars | DNS colorimetric method | ≤0.5 wt% on dry basis | Caramelization above 180 °C |
| Enantiomeric excess | Polarimetry, USP NF | ≥97% for semicrystalline PLLA | Lower melting temperature; slow crystallization |
| Free mineral acids | Titration as H₂SO₄ | ≤0.1 wt% | Corrosion of vacuum pumps and reactors |
Calcium carbonate and calcium oxalate scales deposited on 304L stainless steel fermenter walls and cooling coils are removed by circulating a 5–10 vol% solution of 80 wt% lactic acid at 40–60 °C for 60–120 minutes. The hydroxy acid functionality attacks the scale through both proton donation and chelation of calcium ions, with the chelating effect being significant at pH values above 3.0 where free mineral acids lose their driving force. Lactic acid has a pKa of 3.86 at 25 °C, and the equilibrium between undissociated acid and lactate anion provides buffering capacity that maintains cleaning activity even as the acid is consumed by carbonate scale. Corrosion control must be handled separately, because hot organic acid solutions can initiate pitting on sensitized weld zones in 304L; immersion tests according to ASTM G31-12a are used to compare corrosion rates across candidate inhibitors. A typical acceptance limit for chemical cleaning of austenitic stainless steel is below 0.05 mm/yr, but published data for this specific configuration with technical lactic acid is limited and must be generated on a plant-by-plant basis. After descaling with lactic acid, the surface is passivated with 20–30 vol% nitric acid at 50 °C for 30 minutes to restore the passive oxide layer before the vessel is returned to fermentation service. Process pumps should be rated for organic acid service, and the cleaning skid is typically equipped with a strainer ahead of the spray balls to prevent scale fragments from blocking nozzle orifices.
Acid dye exhaustion on polyamide 6.6 knit goods is controlled not only by temperature and levelling agent but by the buffering capability of the dye bath. At 98 °C and a liquor ratio of 1:10, the dye bath is often set to pH 4.0–5.5 with an organic acid; lactic acid at 1–2% owf supplies a pKa of 3.86, so its maximum buffer capacity occurs near pH 3.8–4.2. This places the starting bath close to the optimum for many milling acid dyes but can promote over-aggressive uptake of levelling-sensitive trichromatic combinations. The use of industrial-grade lactic acid instead of acetic acid is not simply a pH adjustment; the lactate anion remains in the bath and acts as a weak ligand for trace metal ions that would otherwise interfere with dye aggregation. The final pH of the exhausted bath is checked according to ISO 3071:2020 on the aqueous extract of the dyed fabric, and the residual acid content must be neutralized before finishing. Dyeing under pH 3.5 can generate uneven strike and loss of wet fastness, while pH values above 5.5 can reduce exhaustion below 90% for certain C.I. Acid Black 210 formulations. Industrial-grade material with residual sugars can yellow the nylon at high thermofixation temperatures after 180 °C, so sequestering or post-scouring is required when pale shades are produced.
In beamhouse deliming operations, industrial-grade lactic acid is introduced after unhaired and limed hides have reached a swelling pH near 12.5 and a calcium hydroxide load of 30–60 g per kilogram of hide substance. The acid is added at 0.5–2.0% based on fleshed hide weight with 100–200% float water at 25–30 °C, and the drum is run for 30–60 minutes. Unlike ammonium sulfate deliming, which releases ammonia, lactic acid converts lime to calcium lactate, which has high water solubility and is removed in the drum effluent. The target pH for bating is 8.0–8.5, which is compatible with pancreatic trypsin or bacterial protease formulations; reducing the pH below 7.0 before bating intensifies acid swelling and creates a loose grain. Industrial-grade material must be screened for iron and sulfate carryover because iron can stain the wet-blue leather during subsequent chrome tanning, and excess sulfate can precipitate as calcium sulfate in the deliming float. The deliming endpoint is monitored by cutting a hide cross-section and applying phenolphthalein indicator; the absence of red colour above the middle split indicates that free lime has been neutralized. Process water at 30 °C with high bicarbonate alkalinity can consume part of the acid before it reaches the hide, so the dosage has to be adjusted based on the M-alkalinity of the recycled float.
The reaction of technical-grade lactic acid with ethanol to produce ethyl lactate is a reversible esterification that reaches an equilibrium bounded by the water concentration in the reactor. The use of 88 wt% lactic acid introduces roughly 9 wt% water to the initial charge, and this water suppresses ester formation unless a reactive distillation column or circulating molecular-sieve loop is used. A typical pilot configuration uses anhydrous ethanol at a molar ratio of ethanol to lactic acid of 2:1 to 4:1, with sulfuric acid or p-toluenesulfonic acid at 0.5–2.0 wt% as the homogeneous catalyst. The reactor is maintained at 78–90 °C, and the ethanol-water azeotrope is removed continuously to drive the equilibrium toward the ester. Water content in the condensed overhead is monitored by Karl Fischer titration, and the reaction is stopped when the acid value falls below 5 mg KOH/g. The industrial-grade feedstock contributes residual sugars and proteins that can form dark-coloured by-products at the boiling temperature; these are removed by vacuum distillation of the finished ethyl lactate at 154 °C, with the final solvent specification governed by ASTM D1078-11 for distillation range and water tolerance. The same processing logic applies to butyl lactate, although the higher alcohol boiling point raises the reaction temperature to 100–120 °C and increases the risk of oligomer formation from lactic acid self-esterification.
Electroless nickel-phosphorus baths utilising sodium hypophosphite as the reducing agent are operated at pH 4.5–5.0 and 85–90 °C. Technical-grade lactic acid functions as a weak complexant for nickel ions, preventing precipitation of nickel hydroxide and nickel phosphite while allowing controlled deposition. Free nickel ion concentration is monitored by EDTA titration, with typical nickel sulfate hexahydrate maintained at 5–7 g/L and sodium hypophosphite at 20–30 g/L. Lactic acid is added at 10–30 mL/L of an 80 wt% solution, depending on bath turnover and contaminant load. Excessive lactic acid depresses deposition rate and increases bath resistivity; insufficient lactic acid causes clouding and precipitation on immersion heaters. The phosphorus content of the deposit is affected by pH and complexant ratio, and coating performance is verified according to ASTM B733-21 for medium-phosphorus classifications. Filtration through 5 µm polypropylene cartridges and continuous circulation at 10 turnovers per hour prevent insoluble metal phosphites from roughening the coating. Metallic impurities in industrial lactic acid, especially copper above 5 ppm and zinc above 10 ppm, can shift the deposit stress and must be excluded from the feed specification.
Silage preservation with direct acidification uses industrial-grade lactic acid to lower the initial pH of ensiled grass, maize, or high-moisture corn below 4.0 without relying solely on epiphytic homofermentative bacteria. A dose of 3–5 kg of 80 wt% lactic acid per tonne of fresh forage is applied at the silo chopper or at the bagging auger, and the immediate pH drop suppresses enterobacteria and clostridia before the anaerobic phase is fully established. Lactic acid is a non-volatile acid, so it does not evaporate from the face of an opened silage clamp as quickly as formic acid, but it also does not provide the same antibacterial vapour phase action. In low-dry-matter crops below 25% DM, the acid must penetrate plant cell walls, and application through a calibrated pump with flat-fan nozzles improves uniformity. Feed hygiene is governed by Regulation (EC) No 1831/2003 for technological additives, and the acid used must meet the heavy metal and arsenic limits of the relevant additive monograph. Because lactic acid is a normal product of silage fermentation, analytical methods based on HPLC organic acid profiling may overestimate microbial production if direct acid addition is not recorded in the feed analysis report.
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Industrial Grade Lactic Acid is the commercial aqueous solution of 2-hydroxypropanoic acid, CAS 50-21-5, EINECS 200-018-0, supplied in concentrations from 50 wt% to 90 wt% depending on end-use. The product is distinguished from food, pharmaceutical, and polymer-grade lactic acid by a contract-defined impurity envelope rather than by a harmonized monograph. Typical technical model designations include supplier-specific codes such as IG-LA50-HS, IG-LA80-T, IG-LA88-T, and IG-LA90-HS; these are not normative across manufacturers and differ principally in water content, color stability under heat, residual carbohydrate level, and stereochemical distribution between L-(+)-lactic acid and D-(-)-lactic acid. The undissociated acid has a pKa of 3.86 at 25 °C. An 80 wt% solution is a hygroscopic liquid with density 1.19–1.21 g/mL and dynamic viscosity typically 28–40 mPa·s at 25 °C. In industrial neutralization and cleaning service, the lactate/lactic-acid buffer system provides a slower pH fall than strong mineral acids, which is often exploited where corrosion control governs process selection.
Food-grade lactic acid is controlled under monographs such as the FCC Lactic Acid monograph and USP-NF Lactic Acid, which impose lower ceilings for lead, arsenic, heavy metals, sulfate, chloride, cyanide, and residual solvents. Industrial grade is not required to meet those sensory and residual-solvent restrictions. Specification limits are negotiated between buyer and producer and are commonly verified by ICP-OES per ISO 11885:2007, ion chromatography per ISO 10304-1:2007, and Karl Fischer titration per ASTM E203-21. A representative technical 80 wt% solution may permit sulfate ≤100 mg/kg and chloride ≤20 mg/kg without the low arsenic and lead constraints characteristic of FCC-compliant material. Because no harmonized industrial monograph exists, the purchaser must specify the impurity ceiling; otherwise the term “industrial grade” has no regulatory boundary and batch-to-batch variance can exceed process tolerance.
Specification architecture is concentration-dependent. Lower-concentration 50 wt% heat-stable grades are used where reduced viscosity and ambient-temperature pumpability are required. Higher-concentration 80 wt% and 88 wt% technical grades reduce freight and water load but require more careful management of viscosity and freezing behavior in unheated storage. The table below lists representative technical-sheet values for three common industrial concentrations; actual purchaser specifications should govern.
| Parameter | Method | 50 wt% HS | 80 wt% T | 88 wt% T |
|---|---|---|---|---|
| Lactic acid assay | acid-base titration | 49.5–50.5 wt% | 79.5–80.5 wt% | 87.5–88.5 wt% |
| Density at 25 °C | ASTM D4052-22 | 1.10–1.12 g/mL | 1.18–1.20 g/mL | 1.20–1.22 g/mL |
| APHA color | ASTM D1209-21 | ≤100 | ≤80 | ≤100 |
| Water content | ASTM E203-21 | 49.5–50.5 wt% | 19.5–20.5 wt% | 11.5–12.5 wt% |
| L-isomer content | chiral HPLC | ≥97.0% | ≥97.0% | ≥97.0% |
These concentrations are not drop-in equivalents in process equipment. A 50 wt% heat-stable product has markedly lower viscosity than an 88 wt% technical product at 25 °C. Storage in high-density polyethylene or 316L stainless steel is typical; carbon steel is not recommended for prolonged hold because the acid forms iron lactate salts that discolor the solution and can foul low-flow zones. Suppliers commonly specify storage at 15–30 °C and protection from prolonged air contact to limit color development and peroxide formation.
Industrial lactic acid is used as a lower-corrosivity replacement for inhibited hydrochloric acid in recirculating descaling of heat exchangers, evaporators, and cooling-tower circuits. The acid dissolves calcium carbonate according to 2 C3H6O3 + CaCO3 → Ca(C3H6O3)2 + H2O + CO2. A 10 wt% solution has a stoichiometric dissolution capacity of approximately 55 g calcium carbonate per kg of solution, based on molecular weights 90.08 g/mol and 100.09 g/mol. The practical dissolution rate is slower than hydrochloric acid because the pKa of 3.86 limits free proton availability; operators compensate by raising temperature to 40–70 °C and maintaining circulating pH below 4.0. Calcium lactate solubility is temperature-dependent, and spent solution cooled below process temperature can deposit crystalline salt in stagnant legs or low-velocity zones. Descaling skids should therefore use 316L stainless steel or polypropylene piping with no dead-legs and should flush with demineralized water after cleaning. Corrosion coupons per ASTM G31-21 are mounted in the return line; pitting evaluation per ASTM G61-86 is recommended for stainless steel circuits where chloride contamination may exceed 50 mg/L. Industrial lactic acid is not recommended for aluminum or zinc components because rapid metal carboxylate formation occurs without passivation.
In carbonate matrix acidizing, lactic acid is classified as a retarded organic acid. The lower dissociation rate and slow CO2 release can create deeper wormhole penetration than equivalent-volume hydrochloric acid, although published data for this specific configuration is limited and field qualification requires core-flow testing on reservoir lithology. Acid transport and injection equipment commonly specifies positive-displacement pumps with EPDM or FKM elastomers; nitrile seals are excluded above 60 °C because concentrated lactic acid swells and embrittles nitrile. The product should not be blended with amine-based corrosion inhibitors formulated for strong acids unless compatibility tests confirm the absence of insoluble lactate-amine adducts. Formation damage from calcium lactate precipitation is minimized by maintaining bottomhole temperature above the salt deposition threshold or by overflushing with ammonium lactate. Corrosion loss on N80 or P110 tubular steel is evaluated by ASTM G31-21 weight-loss coupons at bottomhole temperature for contact times of 4–24 h.
Polymer-grade lactic acid for poly(lactic acid) production is a specialized industrial material with a narrow L-isomer specification, low residual sugar, and low metal content. Residual sugars and iron catalyze color development during prepolymerization, so polymer-grade supply chains impose tighter ceilings than general industrial material. The route to high-molecular-weight PLA proceeds through oligomerization of lactic acid at 150–180 °C under pressure below 10 mbar, followed by depolymerization to lactide and ring-opening polymerization with tin(II) 2-ethylhexanoate at 170–190 °C. If D-lactic acid exceeds 2–5 mol%, crystallization half-time increases and the melting point falls below the range required for semicrystalline applications. Analytical control uses ASTM D3418-15 for melting and crystallization transitions, ISO 1133-1:2022 for melt flow rate, and ASTM E203-21 for moisture. Dried PLA pellets for injection molding or extrusion must have moisture below 250 mg/kg; higher moisture causes hydrolytic degradation during processing, reducing intrinsic viscosity and shifting molecular weight distribution toward lower chain lengths. Reactive extrusion for chain extension or controlled degradation typically uses a co-rotating twin-screw extruder with L/D ratio 40:1 and vacuum venting below 10 mbar to strip lactide and water.
Ethyl lactate and other lactate esters are produced from industrial lactic acid by esterification with alcohols. A typical reactive distillation configuration for ethyl lactate operates at 80–120 °C with excess ethanol and a catalyst such as sulfuric acid at 0.5–1.0 wt% or a sulfonic acid ion-exchange resin. The equilibrium is unfavorable unless water is removed selectively; azeotropic distillation, pervaporation, or molecular sieve drying can shift conversion above 90%. Ethyl lactate is recovered as a high-boiling ester and used as a biodegradable solvent in coatings and industrial cleaning. Its closed-cup flash point is approximately 46 °C, and its vapor pressure is lower than that of methyl ethyl ketone. In aqueous formulations at pH below 4.5, hydrolysis back to lactic acid and ethanol accelerates, increasing acidity and reducing solvent-phase stability.
Leather deliming uses 50 wt% industrial lactic acid at 0.5–1.5 wt% on limed hide weight. The acid neutralizes calcium hydroxide while buffering float pH between 7.5 and 8.5. Industrial material is preferred over ammonium sulfate where ammonia discharge is regulated. In textile dyeing, lactic acid adjusts dyebath pH for acid dyes on nylon and wool; the buffering action reduces pH drift compared with acetic acid, but the higher molecular weight per acid equivalent requires a larger mass addition.
Compared with acetic acid, industrial lactic acid provides one acid equivalent per 90.08 g rather than 60.05 g for acetic acid. The larger mass per acid equivalent and lower vapor pressure reduce volatile organic acid emissions but require higher addition rates. Compared with citric acid, lactic acid is monoprotic and has less chelating capacity at equal weight, but it is less likely to form sparingly soluble calcium complexes in process streams. Compared with sulfuric or hydrochloric acid, lactic acid is a weak acid with lower proton activity at equal normality and lower uniform corrosion on carbon steel, though it is more expensive per mole of acid and cannot match the proton availability of concentrated mineral acids.
Transport and storage classification for industrial lactic acid solutions depends on concentration and local GHS criteria. Concentrated material may be corrosive to skin and eyes and may carry H314 or H315 hazard statements; the supplier safety data sheet remains the governing document. Storage tanks and transfer lines are often specified in 316L stainless steel or high-density polyethylene. Carbon steel is unsuitable for prolonged storage because iron lactate formation discolors the product and can plug strainers. Material compatibility with process alloys should be confirmed by immersion testing per ASTM G31-21 or by chemical resistance data from the polymer manufacturer for nonmetallic wetted parts.
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