Diethyl hydroxylamine (DEHA) with the formula (C2H5) 2NOH is an inorganic compound that is commonly used as an oxygen scavenger in water treatment industries. It looks like a colorless yellowish liquid with an amine odor. DEHA is an oxygen scavenger known as an alternative to hydrazine and sulfite.
Some of the physical and chemical properties of this material are listed in the table below
|Molar mass||89.138 g·mol−1|
|Density||867 mg mL−1|
|Melting point||−26 to −25 °C (−15 to −13 °F; 247 to 248 K)|
|Boiling point||127.6 °C; 261.6 °F; 400.7 K|
|Solubility in water||Miscible|
In this part, the procurement method of diethyl hydroxylamine from triethylamine and hydrogen peroxide is mentioned. The reaction is occurred as below condition:
The molar ratio of triethylamine to hydrogen peroxide must be at 1∶1.1 and the reaction must take place at 60 ℃ temperature and for about 10 hr. at the pyrolysis step, the temperature must rise to 70 ~ 80 ℃ and then teach to 120 ℃.
In the first stage, triethylamine and peroxide are reacted together as the starting material, then the product of this reaction is purified and Diethyl hydroxylamine is distilled.
In boiler industries, the main purpose of boiler water treatment is to prevent scale formation and corrosion of internal system surfaces.
It is used as an alternative to hydrazine and its derivatives as in boilers for oxygen purifiers. Because it is much less toxic than hydrazine, and like hydrazine, it can neutralize amine fluctuations.
The use of this material in boilers creates a passive film by minimizing the corrosion of oxygen from the boiler feed water.
In addition, Diethyl hydroxylamine minimizes corrosion in low carbon steel because it can form a passive film on low carbon steel surfaces.
In addition to boilers, this material is used in other industries, including:
- Oxygen scavenger for boilers.
- radical scavenger in polymerization
- Electronic chemicals
- resistance from microelectronic components.
- Photographic chemicals
- Upstream O&G-production
- Water treatment industrial
- Polymerization inhibitor
- Color stabilizer
- Discoloration inhibitor
- Corrosion inhibitor
Hazard of DEHA
Diethyl hydroxylamine does not have food certification from the Food and Drug Administration.
LD50 numbers for Diethyl hydroxylamine are 2190 mg / kg in rats and 1300 mg / kg in rabbits.
The volatility of Diethyl hydroxylamine
One of the advantages of using DEHA is its volatility. Also of its oxygen scavenging and corrosion inhibiting in the feed water, based on its volatility, it volatilized with the steam to provide full safety of the system
Other good points of using DEHA in systems:
- ameliorate the equipment reliability, efficiency and consequently increase the yield
- By minimize, the system corrosion make the whole process more cost-effective
The recommended dosage that is necessary must be used in systems is difficult to anticipate but some recommendation is mentioned below:
Dosage of DEHA is related to:
- The dosage of oxygen that is presented in the system
- The final point of the product
- Operational parameters