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3-mercaptopropionic acid (3-mercaptopropionic acid), also known as mercaptolactic acid and thiopropionic acid, has a molecular formula of C 3 H 6 O 2 S, a molecular weight of 106.
1.
Colorless to light yellow transparent liquid; freezing point 16.
2.
After thiourea reacts with hydrochloric acid , it is added with acrylonitrile
3.
4.
5.
Reactor, distillation tower, liquid separator, storage tank, finished product tank
6.
First, 1660kg of 30% hydrochloric acid was added to the reaction kettle, 326kg of thiourea was added with stirring, and the reaction was stirred at 40°C for 0.
7.
8.
1) Determination of freezing point
Pour the liquid-based propionic acid sample into the Zhukov bottle (approximately 2/3)
The difference between the two absolute values measured should not exceed 0.
2) Assay
Measured by acid-base titration
9.
Product use
This product is an intermediate of medicine fennarol
.
It is also used as a stabilizer for polyethylene
.
It can be used for transparent plastic products like thioglycolic acid , and has very good thermal stability, which is better than other stabilizers
.
Also used as antioxidants, catalysts and biochemical reagents
.
Also used in organic synthesis
.
10.
Security measures
(1) Acrylonitrile as the raw material is extremely poisonous and can be absorbed through the skin.
The maximum allowable concentration in the workplace is 45kg/m3
.
Acrylonitrile splashed on clothing should be taken off immediately, splashed on the skin, rinse with plenty of water
.
Thiourea is moderately toxic and corrosive to the skin
.
Production equipment should be closed, and operators should wear labor protection equipment
.
The workshop is well ventilated
.
(2) This product is toxic
.
Packed in plastic buckets or glass bottles, and stored in a cool, dry place
.