Aldehyde Number determination

Determination of Aldehyde Number
Determination of Aldehyde Number

In the structure of many substances used in daily life, it is possible to come across organic substances called aldehydes. There are many chemical processes ranging from gasoline used in motor vehicles to aspirin used to relieve headaches, paints of ballpoint pens and detergents used in washing and dishwashing machines.

While naming aldehydes, names of carboxylic acids have been used. The addition at the end of the acids is removed and the term aldehyde is added instead. For example, formic acid is formaldehyde and acetic acid is acetaldehyde.

Aldehydes are obtained in several ways. In the first method, by using oxidizing agents such as potassium permanganate or potassium dichromate, the primary alcohols are oxidized one step in the acidic medium to give the aldehyde. Oxygen is generally used as an oxidant in the industry. The second method is the reduction of carboxylic acids commonly used in laboratories. In the Rosenmund reaction method, the acid chlorides are reduced with the help of catalyst to obtain aldehydes.

Aldehydes boil at lower temperatures than alcohols with the same carbon number and higher than ethers. According to the number of carbon at room temperature gas, liquid or solid state. They are very effective against chemical reactions.

Formaldehyde is the simplest member of the aldehyde family. It is a widely used compound in industry. They dissolve in water at the rate of 40. This solution is called formalin.

In the accredited laboratories, aldehyde number determination studies are carried out within the scope of chemical tests and the standards prepared by domestic and foreign organizations are complied with in these studies. Reliable and unbiased service is provided in the laboratories and their reports are accepted all over the world. A number of standards based on studies to determine the number of aldehydes are:

  • TS ISO 22241-1 Diesel engines - Nox reducing agent AUS 32 - Part 1: Quality requirements
  • TS ISO 22241-2 Diesel engines - Nox reducing agent AUS 32 - Part 2: Test methods (Annex F includes criteria for the determination of aldehyde content)
  • EP08: Determination of aldehyde content in 0496 glycerin