General Information and Properties

Chemical Name: Monothioethylene glycol

Empirical Formula: HOCH₂CH₂SH

Appearance: Colorless, Transparent Liquid

Boiling Point: 157℃

Applications

Chemical and manufacturing

• Polymerization: Acts as a chain transfer agent to control the molecular weight of polymers and rubber.

• PVC stabilizer: Used as a tin stabilizer in the production of Polyvinyl Chloride (PVC).

• Intermediate: Serves as a raw material and intermediate in the synthesis of other chemicals, such as antioxidants, dyes, and pharmaceuticals. 

  
  

Metal and surface treatment

• Corrosion inhibitor: Inhibits corrosion on metal surfaces, such as steel pipes.

• Metal finishing: Used as a brightening agent in copper deposition and a tarnish remover for alloys and metals.

• Mining: Can be used as an ore flotation agent. 

  
  

Other industrial uses

• Cleaning agents: Included in cleaning formulations due to its solubility and volatility.

• Hair products: A component in hair permanent chemicals, hair dyes, and hair removal products.

• Water treatment: Used in water treatment chemicals and products.

• Agricultural industry: Utilized in the production of agrochemical intermediates. 

Use of 2-Mercaptoethanol in the Oil and Gas Industry

2-Mercaptoethanol is a sulfur-containing organic compound used in the oil and gas industry primarily for its reducing, scavenging, and corrosion-inhibiting properties.

Key Applications:

Hydrogen Sulfide (H₂S) Scavenger:

• Mercaptoethanol is used to neutralize or reduce H₂S and other reactive sulfur compounds in crude oil, natural gas streams, and produced water. By reacting with H₂S, it helps control sour gas conditions and minimizes risks associated with toxicity, odor, and pipeline corrosion.

  
  

Corrosion Inhibition:

• The thiol group in 2-mercaptoethanol can adsorb onto metal surfaces, forming a protective monolayer that prevents oxidation and sulfide stress cracking. This makes it a useful additive in drilling fluids, completion fluids, and production systems to extend the service life of steel equipment.

  
  

Scale and Deposit Control:

• When blended with other additives, 2-mercaptoethanol helps maintain fluid cleanliness by reducing metal ions and preventing the formation of insoluble sulfide scales in pipelines and processing equipment.

  
  

Gas Sweetening and Refining:

• In refining and gas processing, it may be used in formulated chemical treatments to reduce sulfur levels, improving product quality and reducing catalyst poisoning during downstream refining operations.

Advantages:

• Effective at low concentrations due to strong reactivity with sulfur species

• Provides both chemical scavenging and surface protection

• Compatible with many common oilfield treatment formulations

Safety and Handling:

2-Mercaptoethanol is toxic and corrosive, requiring careful handling with proper ventilation, PPE, and spill management. Its strong odor also limits its use to controlled industrial environments.