Tetrakis hydroxymethyl phosphonium sulfate(THPS）

The CAS number of Tetrakis hydroxymethyl phosphonium sulfate is 55566-30 -8, referred to as THPS, and the structural formula contains four active hydroxyl methyl groups,so it has the role of sterilization,deodorization, algae eradication, and inhibition of ferrous sulfide FeS reducing bacteria. Tetrakis hydroxymethyl phosphonium sulfate is phosphonium salt, the molecular formula contains active phosphorus, P is larger than the radius of N atoms, strong polarization, making phosphonium salt more easily adsorbed electronegative bacteria, and because P is located below N in the periodic table, P is less electronegative than N. Therefore, the structure of Tetrakis hydroxymethyl phosphonium sulfate is more stable than quaternary ammonium salt, and the application range is wider, and can be used in water with pH=2-12, while the effect of quaternary ammonium salt is only shown at pH≥9. Tetrakis hydroxymethyl phosphonium sulfate has the characteristics of good water solubility, low solidification temperature, long shelf life, few side effects, and long duration of drug effect. It can also form a polymer THPS -Urea with ammonium and Urea, which is an environmentally friendly pure cotton flame retardant.

Basic information

English name: Tetrakis hydroxymethyl phosphonium sulfate(THPS)

CAS number: 55566-30-8

H.S code: 2931909090

Export tax rebate rate: 13%

Freezing point: -35℃

Boiling point: 111℃

Flash point: 96℃

Molecular weight :406.27

Molecular formula: [(CH2OH)4P]2SO4

EINECS number: 259-709-0

Physical and chemical properties and molecular weight: colorless transparent liquid, soluble in water, insoluble in acetone and ethanol.

Mechanism of action

1, Tetrakis hydroxymethyl phosphonium sulfateis a cationic group type fungicide with a positive charge. Since the phosphorus atom in the molecule is positive 5 valence, four hydroxymethyl-CH2OH - have only four negative charges. Usually dissolved in water, the free group forms a cation with a positive charge. This makes it a cationic fungicide.

2, Tetrakis hydroxymethyl phosphonium sulfate contains four hydroxyl groups,the role of hydroxyl groups is to destroy microbial cell membranes and proteins, inhibit enzyme activity, so as to achieve the role of killing microorganisms.

3, The mass fraction of THPS has a significant effect on the dissolution of ferrous sulfide, while the PH value, reaction temperature and reaction time have no significant effect on the dissolution of ferrous sulfide.In practical application, the effective content of THPS can be appropriately increased to enhance the dissolution effect of ferrous sulfide. Increasing the effective content of the solution will help to dissolve ferrous sulfide better. When PH=5, reaction temperature is 80℃, reaction time is 8 hours, and the effective content of dissolved solution is 6%, the dissolution rate of ferrous sulfide is 56%. When the content of the dissolved solution is increased to 14%, the dissolution rate of the dissolved solution to ferrous sulfide reaches 93%. Therefore, with the increase of the mass fraction of the dissolved solution, the dissolution rate of ferrous sulfide also increases.

4,Tetrakis hydroxymethyl phosphonium sulfate(THPS) is a reducing fungicide, is a positive charge of cationic sterilization, positive charge ionizing reduction ability is strong, negative charge anion means that the oxidation effect is good.

5,As a flame retardant, THPS has a flame retardant effect. Tetrakis hydroxymethyl phosphonium sulfate (THPS) and urea condensation into urea precondensation, amino can play the role of nitrogen flame retardant. Therefore, it has the synergistic effect of phosphorus-nitrogen flame retardancy.

Production process

Mainly from phosphine, formaldehyde and sulfuric acid reaction. Note the ratio and purity of the three substances. Chemical reaction formula:

2PH3+8HCHO+H2SO4= [(HOCH2) 4P] 2SO4

1, Collect and store phosphine in the waste gas released in the production process of sodium hypophosphite; The phosphine gas produced in the production of sodium hypophosphite is collected and stored after being washed by the intake water washing kettle, and then the phosphine gas is washed by the outlet water washing kettle and then into the circulation tower. The impurity content of the gas after washing is low.

2, Adding 300 kg of non-ionized water to the mixing kettle, pumping sulfuric acid and formaldehyde into the mixing kettle according to the molar ratio of 1:8.5-8.7(according to the climate). This ratio can be completely reacted in the process of absorbing phosphine gas.

3, The prepared mixture into the circulation kettle, at the temperature of 40℃~ 55℃ , through the circulation tower to absorb phosphine gas, when the content of Tetrakis hydroxymethyl phosphonium sulfate is measured at 40%, the PH value is about 4 when unloading , pumping into the concentration kettle, at the vacuum degree of 0.06Mpasteam clip heating concentration of Tetrakis hydroxymethyl phosphonium sulfate to 75%; The reaction formula is as follows: 8HCHO+H2S04+PH3=[(CH2OH)4P]2S04

4,Pump he feed solutiotn into the decolorizing kettle and add 2%. The activated carbon powder is filtered by secondary decolorization adsorption, so as to remove impurities and the material  liquid is pure.

Indicators

Content≥75%

Active phosphorus≥11.0%

Specific gravity (25C) : 1.37-1.41g/ml

Viscosity (20C) : 30-45CP(mPa.s)

Fe≤0.0015%

PH: 2.5-5.5

Application:

1. Tetrakis hydroxymethyl phosphonium sulfate is a classic substrate improvement product in aquaculture. It can effectively degrade toxic substances such as ammonia nitrogen, nitrite, hydrogen sulfide and heavy metals in water, and decompose harmful substances such as residual bait, excrement, animal, plant and algae dead bodies and other organic wastes deposited on the bottom of the pond. Can completely eliminate the bottom mud black, fever, odor, fishy acid and other corruption, can effectively degrade algal toxins and other biological toxins. Remove the odor of water and the bottom of the pool, decompose the viscous substances in the water, and effectively adjust the water dissolved oxygen, temperature, bottom heat, nutrients and other bad vertical stratification phenomenon. For the aging ponds such as plate  bottom, saline-alkali bottom and fishy odor type, improve the transparency of the water, ensure the normal photosynthesis of plankton, and the deodorization effect is remarkable; It is especially suitable for water quality change, bad climate and the improvement of bottom quality during the disease period, and can significantly improve the anti-stress ability of aquatic animals.

2. Tetrakis hydroxymethyl phosphonium sulfate is an environmental protection fungicide in oil field exploitation,which can well inhibit ferrous sulfide reducing bacteria, and just like glutaraldehyde has universal use.

3,The concentration of Tetrakis hydroxymethyl phosphonium sulfate is high, the direct use effect and dispersion is not favorable, generally through dilution into about 10~20% of the aqueous solution dilution, and then through the special equipment to the pond sprinkling. This has a certain purification of the water sterilization and disinfection effect. The technical strength of the breeders can be combined with other fungicides to use together, the effect is better. However, the main fungicide is needed, and the synergistic effect between the synergistic agents is appropriate.

4, After condensation with urea is a green flame retardant, mainly used for pure cotton, leather and other flame retardants. Flame-retardant products, washing times, feelgood.

5, Made Tetrakis hydroxymethyl phosphonium sulfate as bottom modification particles, through the combination of sodium powder carrier, other synergists to make about 8~12% particles, particles will sink to the bottom of the pond after sprinkling, so that the bottom of the pond organic matter, odor, harmful microorganisms inhibition and kill the effect, the use of particles in aquatic products is more, but also more convenient.

Product characteristics and effect

1, THPS has a good killing effect on sulfate-reducing bacteria, 20mg /L bactericidal rate reached more than 98%.

2, Compared with the bactericidal effect of common bactericides, the killing effect is better than isothiazolinone and 1227 widely used on the market at present, and glutaraldehyde is similar.

3, THPS can be used in a wide PH range.

4, THPS does not appear foaming in the process of use, which is better than common quaternary ammonium salt biocides. It has good compatibility with corrosion and scale inhibitors, especially with anionic corrosion and scale inhibitors, and still has good results.

5, Tetrakis hydroxymethyl phosphonium sulfate THPS at the temperature of 20℃~ 50℃ have a good killing effect.

6, THPS has a good killing effect on iron bacteria, and the bactericidal effect can reach more than 99% when the concentration is 5mg/L.

7, The effect of THPS on killing fungi for 8h is much higher than that of killing heterotrophic bacteria, and the bactericidal rate of THPS is significantly reduced. The efficacy lasts for a long time, when 20mg/L, the action for 48h, the bactericidal rate can still be maintained at more than 90%.

8.THPS has good compatibility with common corrosion and scale inhibitors. Commonly used corrosion and scale inhibitors do not affect the bactericidal effect of THPS.

9, Compared with the traditional fungicide,Tetrakis hydroxymethyl phosphonium sulfate is less toxic and harmless to the environment. Applied to the cooling water system has a broad spectrum of bactericidal effect and strong bactericidal ability.

10,There is no foaming phenomenon in the process of use, which is better than commonly used quaternary ammonium salt biocides.

Q&A.

1, The phenomenon of icing

For many customers, if you find that Tetrakis hydroxymethyl phosphonium sulfate freezes, it feels very incredible. In fact, like many chemicals, there is a critical point (melting point) between liquid and solid, and it is used by customers in Canada and Russia because they are located in cold places. The low temperature can sometimes reach -40 to -50 degrees, while the melting point of phosphorous sulfate is only -35 ℃. Therefore, the majority of foreign customers in the use of Tetrakis hydroxymethyl phosphonium sulfate sterilization process, the surrounding environment must be higher than -35 degrees.

2,Price

The historical price is from 6500-45000RMB/MT, and the price changes are related to factors such as sodium hypophosphate, yellow phosphorus price, environmental protection policy and supply and demand.

3, Pungent smell

There are a very small number of customers in the high temperature environment to use or compound the use of Tetrakis hydroxymethyl phosphonium sulfate as a scale inhibitor, and the environmental temperature reached 111 ℃, Tetrakis hydroxymethyl phosphonium sulfate is very likely to decompose. Just said a few customers in the ultra-high temperature after the use of the product irritating odor may be Tetrakis hydroxymethyl phosphonium sulfate decomposition products. Of course, the product itself also has a certain smell due to the presence of a small amount of formaldehyde. There is an essential difference in the taste of the two.

4. Content

Effective content is generally 75%, it is difficult to reach 99%, which is determined by the nature of the product.

5,Mixing contraindications

Try to avoid mixing with hydrogen peroxide, potassium permanganate, sodium hypochlorite and other strong oxidants or strong alkaline chemicals.

6. Can you kill algae

1~2kg /acre dilution 100 times, direct spray, can kill jacque algae, black algae, but blue algae cannot be killed.

7, Does it contain formaldehyde

Tetrakis hydroxymethyl phosphonium sulfate contains a certain concentration of formaldehyde, the content of formaldehyde is dynamic change, with the temperature, time and other factors change. This is mainly determined by the nature of the product itself and the production process.

Storage and Packaging

1400kg/IBC or 50kg/barrel; Store separately from oxidants and strong alkalis; Keep the warehouse ventilated and dry and out of direct sunlight.

Tetrakis hydroxymethyl phosphonium sulfate has good water solubility, such as with a PH value of less than 7 fungicides, can produce synergistic bactericidal effect, less side effects in water, and oxidizing water quality amendments used alternately, can avoid the production of rich phosphorus and cyanobacteria. Phosphine  in the process of reaction with sulfuric acid, will produce a small amount of nano-scale phosphorus compounds, contact with the air will be oxidized or absorb water vapor in the air, resulting in a change in ph value, product color will also change. There is no effect on the use of the effect. Tetrakis hydroxymethyl phosphonium sulfate has the characteristics of stable nature, low bubble, long action time, low toxicity, no harmful residue and so on. It can inhibit hydrogen sulfide, nitrite, and can be quickly decomposed.