Spanish English Chinese

Tetrakis Hydroxymethyl Phosphonium Sulphate (THPS) Use Guide 2019

Tetrakis hydroxymethyl phosphonium sulphate is an environmentally friendly biocide. It is mainly used in water treatment systems, oil drilling operations and the paper industry. Although THPS chemical has been widely used. Customers still have some questions in the process of using it. Below is a guide to the use of 2019 tetrakis hydroxymethyl phosphonium sulphate by IRO water.

Q1. The shelf life of tetrakis hydroxymethyl phosphonium sulphate.

(1) Is the THPS solution easily oxidized by air?
(2) How long does it take to open the lid (usually open the lid and use it, how long does it take for the whole bottle to expire)?


Tetrakis hydroxymethyl phosphonium sulphate, abbreviated as THPS. It is a new type of spectral fungicide.

Although the manufacturer stated that the chemical properties are stable. But from itself it belongs to antioxidants. After use, THPS can be quickly decomposed into non-toxic, non-side-effect degradation products.

This shows that it is a fairly strong reducing agent. For the sake of caution, THPS must be protected from light, stored at room temperature, and covered. If there is no text indicating the expiration date, it can only be judged by its effect.

Q2. What can be mixed with tetrakis hydroxymethyl phosphonium sulphate?

The THPS biocide mainly kills bacteria and algae in water and also kills fungi. What kind of compounding can I add?


Tetrakis hydroxymethyl phosphonium sulphate belongs to a quaternary phosphonium salt. It is a new environmentally friendly biocide. The industry is collectively referred to as THPS. What you mean by “mixing”, the industry is collectively called “complex.”

A biocide biocide is commonly used in combination with biocides to kill fungi. Many organic sulfur compound biocides are related to fungi and slime. In particular, sulfate-recovering bacteria are very useful. Among the organic sulfur compound biocides, dithiocyanomethane and allicin (thiol compound) are widely used in China.

Q3. Use of tetrakis hydroxymethyl phosphonium sulphate

The amount of tetrakis hydroxymethyl phosphonium sulphate in water disinfection 0.1ml / L, online introduction of contact with water or see light can be added to the oxidation of the air.

How long will the disinfection activity last?

The THPS is up to 75%. It is an aqueous solution itself. Online introduction of contact with water or seeing light can add air to the oxidation of it, the merchant said that the shelf life is very long (several years), right?


The THPS aqueous solution is not easily deteriorated in the package. What degrades it is the oxygen in the air, which acts to accelerate oxidation. There is a carbon phosphorus single bond in the tetrakis hydroxymethyl phosphonium sulphate. The bond can be easily oxidized by oxygen. If there is no oxygen in the environment, it is still stable.

Tetrakis hydroxymethyl phosphonium sulphate is rapidly degraded after use, and the disinfection activity is kept for a short time. Keep the water-disinfected diluted liquid for a few hours.

Q4. Basic chemical properties of phosphorus tetramethylolsulfate.

The water treatment agent tetrakis hydroxymethyl phosphonium sulphate was quickly found to be rapidly degraded to a completely harmless substance after use. Keep the container sealed during storage. It should be stored separately from oxidants and acids.

(1) What does “use” mean? Is it degraded after dilution with water or light?

(2) Is THPS susceptible to chemical reactions with oxidants and acids?


Tetrakis hydroxymethyl phosphonium sulphate is a cationic surfactant. Its structure is similar to that of neostigmine (quaternary ammonium salt). The principle of water treatment is to adsorb particles in water to precipitate it. Soil particles or impurity sols in water are generally negatively charged. Cationic surfactants can effectively precipitate them to purify water.

“Use” of course means that the THPS biocide is added to the water to purify the water. The tetrakis hydroxymethyl phosphonium sulphate is highly reductive. After contact with water or seeing light, it can be oxidized by brushing air. It is easy to react with oxidants to form phosphates. The acid can change its structure and lose its positive charge and fail.

Q5. Does the following chemicals react with tetrakis hydroxymethyl phosphonium sulphate?

Will THPS be boiled under the weak acid conditions with the following two substances, will it react?

(1) Sodium sulfite (Hint: boiled under weak acid conditions will release sulfur dioxide)

(2) Hexamethylenetetramine (Urotropine) (Hint: Urotropine boils to release formaldehyde under weak acid conditions)


It doesn’t seem to be.

Tetrakis hydroxymethyl phosphonium sulphate is produced as a permanent flame retardant for cotton fabrics. It was later found to have a biocide that is very environmentally friendly.

THPS chemical can kill microorganisms such as algae in water. A new type of water treatment agent that does not pose any harm to the environment.

According to the structural characteristics of tetrakis hydroxymethyl phosphonium sulphate, it hydrolyzes to produce phosphoric acid and methanol, and the aqueous solution is acidic. It is reductive and its properties are fairly stable. From these aspects, it does not have a reaction worthy of attention with the above two substances.

Q6. Both Kathon (MIT/CMIT) and THPS are used for water treatment sterilization. Can they be mixed?

(1) Kathon, a mixture of MIT/CMIT. It is compatible with anionic, cationic, nonionic and various ionic emulsifiers and proteins. It is better to use in combination with quaternary ammonium salts. It can be used simultaneously with oxidizing biocides.

THPS is a cationic surfactant (similar to a quaternary ammonium salt). It works best with Kathon. The sulfur in the tetrakis hydroxymethyl phosphonium sulphate is sulfate. Sulfur which cannot be used in a sulphide-containing cooling water system refers to S2-, sulfite ions or sulfur-containing organics.
The above is the latest guide to use of THPS in 2019. If you have any questions, please contact us.