Sequestration

Definition - What does Sequestration mean?

Sequestration is the seizure of certain chemicals and ions for the betterment of an industrial process. Sequestering agents are mixed in a working fluid so that the fluid can be used in other industrial processes with effective performance. These sequestering agents remove ions from a solution by forming a ring which does not have chemical reactions with the ion which is removed. They combine with calcium and magnesium ions as well as other heavy metal ions and are commonly used to remove water hardness.

Petropedia explains Sequestration

Sequestration is related to many processes in an oil and gas industry which need to be strictly followed in order to adhere to the operating policies. It involves:

  • Carbon Sequestration, which refers to capturing carbon dioxide from the atmosphere and anthropogenic carbon dioxide from large scale industrial plants such as power plants and oil refineries before it is released into the atmosphere.
  • Underground injection control is also one of the geologic sequestration processes which refer to long-term holding of hazardous and non-hazardous industrial and municipal waste under the ground in such a way that it does not affect underground water sources.

Soft water or mineral water is one of the important ingredient in providing necessary cooling, cleaning, etc., in many complex industrial process. The water which is available for industries, many a times gets contaminated with the in-house pollutants, toxic/non-toxic wastes and thus it becomes hard. If such water is used directly, it may affect the metallic equipment and lead to rust and corrosion. Thus, in order to avoid such instances, chemical sequestering agents that surround another molecule or atom and hold it "in seclusion" are used. In this process, the chemical sequestering agents hide the molecule or atom and prevent them from coming chemical reactions.

The main types of commercial sequestering agents are:

  • Aminocarboxylic acid base products
  • Phosphates and phosphonates
  • Hydroxy carboxylates
  • Polyacrylates
  • Sugar acrylates
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