BGC > Produktsuche > D-(-)-Lactic acid

Molecular Formula: C3H6O3
Molecular Weight: 90.08
Hazard Symbols: Xi
UN Number: UN 3265 8/PG III
WGKGermany: 3
PackingGroup: III

Appearance	colorless liquid
Assay w%	NOT less than 95.0 and not more then 105.0 of the labeled concentration
Stereochemical purity %	≥ 99.0
Color APHA	≤ 25
Methanol w%	≤ 0.2
Iron(Fe) w%	≤ 0.001
Chloride(as CI) w%	≤ 0.001
Sulphate(as SO4) w%	≤ 0.001
Heavy metals(as Pb) w%	≤ 0.0005
Density(20℃ ) g/ml	1.180-1.240

Purity: 90% (T)
Smile code: C[C@@H](O)C(O)=O
MDL Number: MFCD00068313
MolFormula: C3H6O3
MolWeight: 90.0779
Available in stock: 156173

Synonyms:(r)-lactate;(R)-2-hydroxypropionic acid;D-milk acid;D(-)lactic acid; D-lactic acid;D-2-hydroxypropanoic acid;(R)-lactic acid; (R)-2-Hydroxypropanoic acid
CAS:10326-41-7
Molecular formula:C3H6O3
Molecular Weight:90.08

Content%: ≥92
Heavy metals: ≤5ppm
Optical content D / (L + D)%: ≥99.0
Iron: ≤5ppm
Color: ≤ 50apha
Relative density (20/20 ° C): 1.20-1.22
Chroma after heating: ≤ 50apha
Sulfate: ≤10ppm
Sulfuric ash powder%: ≤ 0.02
Chloride: ≤ 10ppm
Packing: 25 kg, 255 kg plastic drums.
Boiling point: 125 ° C (92% solution)
Viscosity: 5 to 60 mPa · s (25 ° C) (50 to 90% solution)
Decomposition temperature: minimum 200 ℃
Stroage condition:2-8°C,Store in a cool dry place, away from light preservation, not open dumping, and alkali substances, strong oxidant isolation.
Solubility:H2O: 0.1 g/mL, clear, colorless
Merck:13,5350

Chemical properties: D-lactic acid 90% is the use of carbohydrates similar to sugar as raw materials, biological fermentation technology with high optical activity (chiral) lactic acid. D-lactic acid product is a colorless or pale yellow clear viscous liquid, slightly sour; a wetting, aqueous solution was acidic reaction. With water, ethanol or ether can be mixed, insoluble in chloroform.

D-lactic acid with a typical chemical properties of monocarboxylic acid, aqueous solution was weakly acidic, the concentration of 50% or more will be part of the formation of lactic acid anhydride, with some alcohols to produce alkyd resin, in the heating conditions can be intermolecular esterification , The formation of lacto lactic acid (C6H10O5), diluted and heated can be re-hydrolyzed into D-lactic acid. Under the action of zinc oxide dehydrating agent, two molecules of D-lactic acid from the two molecules of water, self-polymerization to form a cyclic dimer D-lactide (C6H8O4, DLA). Dehydration can be formed fully polymerized D-lactic acid. Since the stronger the tendency of lactic acid to esterify itself, lactic acid is usually a mixture of lactic acid and lactide.

Usage:

Mainly used in polylactic acid processing and manufacturing of chiral drugs and pesticide intermediates synthesis.
The application of D-lactic acid in the synthesis of chiral compounds
High optical purity of D-lactic acid (97%) as a chiral center is a variety of precursors of chiral substances, is an important chiral intermediates and organic synthesis of raw materials, widely used in pharmaceutical, highly efficient and low toxicity pesticides and herbicides , Cosmetics and other areas of chiral synthesis. For example, Nippon Tairike Chemical Industries Co., Ltd. uses D-lactic acid to produce an excellent herbicide Puma Super. Germany Hoeehst company also developed a new type of D-lactic acid as a raw material efficient herbicide Weibo (Whip Super). Germany BASF D-lactate isopropyl as raw materials to produce herbicide Duplosan, and has a large-scale market. In addition, a calcium antagonist antihypertensive drug, a picolinic acid derivative, and dimethyltetrachloropropionic acid and a fluorinated herbicide are also used as the raw material with high optical purity D-lactic acid.
2.D-lactic acid derivatives in the chemical industry
D-lactic acid as raw material lactic acid esters in spices, synthetic resin coatings, adhesives and printing inks and other production applications widely in the oil pipeline and the electronics industry, cleaning and other applications. Among them, D-methyl lactate can be mixed with water and a variety of polar solvents, can fully dissolve nitrocellulose, cellulose acetate, cellulose acetate butyrate and a variety of polar synthetic polymers, while the melting point High evaporation rate, it is an excellent high boiling point solvent, can be used as a mixed solvent to improve the workability and solubility, in addition, can be used as medicine, pesticide raw materials and other chiral compounds synthesized precursors , Intermediates.
The application of D-lactic acid in polylactic acid biodegradable materials
Lactic acid is a raw material of bioplastics polylactide (PLA). The physical properties of polylactic acid materials depend on the composition and content of the two isomers. The racemic D, L-polylactic acid (PDLLA) synthesized from racemic D, L-lactic acid is an amorphous structure with poor mechanical properties, short degradation time and shrinkage in vivo. % Or more, the application is limited. Polylactic acid (PLLA) and D-polylactic acid (PDLA) of the segmental arrangement of regularity, crystallinity, mechanical strength and melting point are far more than PDLLA.