Halogen acid corrosion inhibitor base
OwnerArthur Cizekinventor
Life of this patent
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Abstract
The reaction product of thiourea (alternatively, a primary amine), formaldehyde, and an aromatic ketone (e.g. acetophenone) in the presence of an organic acid (e.g. acetic acid) and a mineral acid has been found effective as a corrosion inhibitor base for metals in acid media, particularly fluids containing halogen acids. The corrosion inhibitor base can be prepared in nearly 100% yield, and is a more effective base, as contrasted with bases prepared with fatty acids as contrasted with lower molecular weight organic acids such acetic acid.
Claims26
A halogen acid corrosion inhibitor base comprising a reaction product of thiourea, formaldehyde, and an aromatic ketone made in the presence of a mineral acid and an acid selected from the group consisting of acetic acid, propionic acid, and mixtures thereof.
A halogen acid corrosion inhibitor base comprising a reaction product of thiourea, formaldehyde, and acetophenone made in the presence of acetic acid and a mineral acid.
A halogen acid corrosion inhibitor comprising a corrosion inhibitor base including a reaction product of thiourea, formaldehyde, and an aromatic ketone made in the presence of a mineral acid and an acid selected from the group consisting of acetic acid, propionic acid, and mixtures thereof.
A halogen acid corrosion inhibitor comprising a corrosion inhibitor base including a reaction product of thiourea, formaldehyde, and acetophenone made in the presence of acetic acid and a mineral acid.
A method of inhibiting the corrosion of metals in the presence of a liquid medium containing at least one halogen acid comprising including in the fluid a corrosion inhibitor comprising a corrosion inhibitor base including a reaction product of thiourea, formaldehyde, and an aromatic ketone made in the presence of a mineral acid and an organic acid selected from the group consisting of acetic acid, propionic acid and mixtures thereof.
A method of inhibiting the corrosion of metals in the presence of a liquid medium containing at least one halogen acid comprising including in the fluid a corrosion inhibitor comprising a corrosion inhibitor base including a reaction product of thiourea, formaldehyde, and acetophenone made in the presence of acetic acid and a mineral acid.
A fluid for contacting a metal surface, the fluid comprising
- at least one halogen acid;
- and
- a corrosion inhibitor comprising a corrosion inhibitor base comprising an effective amount of a reaction product of thiourea, formaldehyde, and an aromatic ketone made in the presence of a mineral acid and an organic acid selected from the group consisting of acetic acid, propionic acid, and mixtures thereof.
A fluid for contacting a metal surface, the fluid comprising
- at least one halogen acid;
- and
- a corrosion inhibitor comprising a corrosion inhibitor base comprising an effective amount of a reaction product of thiourea, formaldehyde, and acetophenone made in the presence of acetic acid and a mineral acid.
Dependencies are inferred from the claim text.