Chinese Japanese Germany Korea

2-Mercaptopropionic acid

Uses Preparation Content Assay Storage and transportation
2-Mercaptopropionic acid
2-Mercaptopropionic acid structure
Chemical Name:
2-Mercaptopropionic acid
FEMA 3810;FEMA 3180;thiolactic;Thiomilchsure;THIOLACTIC ACID;2-thiolacticacid;2-Thiolactic acid;Thiolacticacid,95%;Thiolactic acid 95%;Tiopronin Impurity B
Molecular Formula:
Formula Weight:
MOL File:

2-Mercaptopropionic acid Properties

Melting point:
10-14 °C(lit.)
Boiling point:
102 °C16 mm Hg(lit.)
1.196 g/mL at 25 °C(lit.)
vapor pressure 
1.7 hPa (20 °C)
refractive index 
n20/D 1.481(lit.)
Flash point:
190 °F
storage temp. 
pK1:4.32(0);pK2:10.20(SH) (25°C)
Clear colorless to slightly yellow
2 (H2O, 20℃)(undiluted)
Water Solubility 
JECFA Number
CAS DataBase Reference
79-42-5(CAS DataBase Reference)
NIST Chemistry Reference
2-Mercaptopropanoic acid(79-42-5)
EPA Substance Registry System
Propanoic acid, 2-mercapto-(79-42-5)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  C
Risk Statements  34-22
Safety Statements  26-36/37/39-45-25
RIDADR  UN 2936 6.1/PG 2
WGK Germany  1
RTECS  UF5250000
HazardClass  6.1
PackingGroup  II
HS Code  29309070
Toxicity LD50 orally in Rabbit: 730 mg/kg
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H227 Combustible liquid Flammable liquids Category 4 Warning P210, P280, P370+P378, P403+P235,P501
H301 Toxic if swalloed Acute toxicity,oral Category 3 Danger P264, P270, P301+P310, P321, P330,P405, P501
H314 Causes severe skin burns and eye damage Skin corrosion/irritation Category 1A, B, C Danger P260,P264, P280, P301+P330+ P331,P303+P361+P353, P363, P304+P340,P310, P321, P305+ P351+P338, P405,P501
H318 Causes serious eye damage Serious eye damage/eye irritation Category 1 Danger P280, P305+P351+P338, P310
H331 Toxic if inhaled Acute toxicity,inhalation Category 3 Danger P261, P271, P304+P340, P311, P321,P403+P233, P405, P501
Precautionary statements:
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P405 Store locked up.

2-Mercaptopropionic acid price More Price(15)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich T31003 Thiolactic acid 95% 79-42-5 5g $18.3 2018-11-13 Buy
Sigma-Aldrich 16583 2-Mercaptopropionic acid analytical standard 79-42-5 1ml $54.1 2018-11-13 Buy
TCI Chemical M0060 Thiolactic Acid >97.0%(GC) 79-42-5 25g $14 2018-11-22 Buy
TCI Chemical M0060 Thiolactic Acid >97.0%(GC) 79-42-5 100g $28 2018-11-22 Buy
Alfa Aesar L10257 2-Mercaptopropionic acid, 97% 79-42-5 100g $30.1 2018-11-13 Buy

2-Mercaptopropionic acid Chemical Properties,Uses,Production


2-Mercaptopropionic acid is an important raw material for organic synthesis, mainly used in the preparation of herbicides, plasticized heat stabilizers and antioxidants, as well as the deployment of daily spices.


It is prepared from the electrolysis of the corresponding sulfide S (SCHMeCO2H) Alternatively, it can be prepared from the reaction between pyruvate and hydrogen sulfide. Hydrogen sulfide is added to 50% pyruvic acid to make it saturated at 60-70 DEG C; add hydrochloric acid to until turbidity is formed; dilute sulfuric acid is added to make it weakly acidic, and 2.5% sodium amalgam is added to the precipitated compound for reduction. Cool it till hydrogen sulfide is completed released. Then add ether the acidic medium, extract the lactic acid, remove the ether by distillation, here thiolactic acid is finally obtained.

Content Assay

Accurately weigh 1 g of sample, transfer it into a 250ml Erlenmeyer flask filled with 75 ml of water; add phenolphthalein indicator (TS-167); use 0.5mol / L NaOH solution for titration. Each ml of 0.5mol / L NaOH solution is equivalent to 53.08 mg of 2-mercaptopropionic acid.

Storage and transportation

Store in a cool and ventilated place, the container should be sealed to prevent damp, heat, handling gently, can’t be inverted, and be careful not to damage the packaging.

Chemical Properties

Clear colorless to slightly yellow liquid. Oily liquid; Melting point 10 ℃; Boiling point d-95 ~ 100 ℃ / 2133Pa, dl- 98.5 ~ 99.0 ℃ / 1866Pa; Density I-D19.24 1.193; Refractive index dl-nD: 1.4823; Optical rotation[α] D-45.47; soluble in water, ethanol and ether.


Depilatory, hair-waving preparations.

General Description

An oily liquid with an unpleasant odor. Toxic by ingestion and skin absorption. Used as a depilatory and in hair waving preparations.

Air & Water Reactions

Soluble in water and denser than water.

Reactivity Profile

2-Mercaptopropionic acid is an organosulfide/organic acid. Organosulfides are incompatible with acids, diazo and azo compounds, halocarbons, isocyanates, aldehydes, alkali metals, nitrides, hydrides, and other strong reducing agents. Reactions with these materials generate heat and in many cases hydrogen gas. Many of these compounds may liberate hydrogen sulfide upon decomposition or reaction with an acid. Carboxylic acids donate hydrogen ions if a base is present to accept them. They react in this way with all bases, both organic (for example, the amines) and inorganic. Their reactions with bases, called "neutralizations", are accompanied by the evolution of substantial amounts of heat. Neutralization between an acid and a base produces water plus a salt. Carboxylic acids with six or fewer carbon atoms are freely or moderately soluble in water; those with more than six carbons are slightly soluble in water. Soluble carboxylic acid dissociate to an extent in water to yield hydrogen ions. The pH of solutions of carboxylic acids is therefore less than 7.0. Many insoluble carboxylic acids react rapidly with aqueous solutions containing a chemical base and dissolve as the neutralization generates a soluble salt. Carboxylic acids in aqueous solution and liquid or molten carboxylic acids can react with active metals to form gaseous hydrogen and a metal salt. Such reactions occur in principle for solid carboxylic acids as well, but are slow if the solid acid remains dry. Even "insoluble" carboxylic acids may absorb enough water from the air and dissolve sufficiently in 2-Mercaptopropionic acid to corrode or dissolve iron, steel, and aluminum parts and containers. Carboxylic acids, like other acids, react with cyanide salts to generate gaseous hydrogen cyanide. The reaction is slower for dry, solid carboxylic acids. Insoluble carboxylic acids react with solutions of cyanides to cause the release of gaseous hydrogen cyanide. Flammable and/or toxic gases and heat are generated by the reaction of carboxylic acids with diazo compounds, dithiocarbamates, isocyanates, mercaptans, nitrides, and sulfides. Carboxylic acids, especially in aqueous solution, also react with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), to generate flammable and/or toxic gases and heat. Their reaction with carbonates and bicarbonates generates a harmless gas (carbon dioxide) but still heat. Like other organic compounds, carboxylic acids can be oxidized by strong oxidizing agents and reduced by strong reducing agents. These reactions generate heat. A wide variety of products is possible. Like other acids, carboxylic acids may initiate polymerization reactions; like other acids, they often catalyze (increase the rate of) chemical reactions.

Health Hazard

TOXIC; inhalation, ingestion or skin contact with material may cause severe injury or death. Contact with molten substance may cause severe burns to skin and eyes. Avoid any skin contact. Effects of contact or inhalation may be delayed. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause pollution.

Fire Hazard

Combustible material: may burn but does not ignite readily. When heated, vapors may form explosive mixtures with air: indoors, outdoors and sewers explosion hazards. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.

Safety Profile

Poison by ingestion. Moderately toxic by inhalation. When heated to decomposition it emits toxic fumes of SOx. See also SULFIDES and MERCAPTANS.

2-Mercaptopropionic acid Preparation Products And Raw materials

Raw materials

Preparation Products

2-Mercaptopropionic acid Suppliers

Global( 132)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22043 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20786 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32651 55
Tianjin Zhongxin Chemtech Co., Ltd.
022-66880086 CHINA 559 58
Chemwill Asia Co.,Ltd.
86-21-51861608;;; CHINA 24118 58
Hubei Jusheng Technology Co.,Ltd.
86-188-71490254 CHINA 20229 58
(323) 306-3136
(626) 453-0409 United States 8430 58
career henan chemical co
+86-371-86658258 CHINA 19997 58
Hubei Hongxin Ruiyu Fine Chemical Co., Ltd. 027-65526929 15102793023
027-65526669 China 1093 55
Hubei HongxinRuiYu Fine Chemical Co., Ltd. 15671591110
027-65526669 China 176 58

View Lastest Price from 2-Mercaptopropionic acid manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-08-15 2-Mercaptopropionic acid
US $2.00 / KG 1KG 98% 1ton career henan chemical co

2-Mercaptopropionic acid Spectrum

79-42-5(2-Mercaptopropionic acid)Related Search:

Copyright 2017 © ChemicalBook. All rights reserved