Preparation method of vanadium inhibitor

      On the stage of industrial production, the widespread use of fuel provides power support for many fields. However, the presence of vanadium in fuel is like a "time bomb", causing a series of problems such as equipment corrosion, which brings a heavy burden to enterprises. In order to effectively address this challenge, vanadium inhibitors have emerged. So, how is preparation method of vanadium inhibitor? Let's unveil its mysterious veil together.

      The preparation methods of vanadium inhibitors vary depending on the type of inhibitor. The following are several common methods for preparing vanadium inhibitors:

1. Preparation method of nano magnesium oxide based vanadium inhibitor

      Raw material preparation: Prepare industrial grade magnesium oxide, heavy alkylbenzene, mixed trimethylbenzene, terpene resin, oleic acid, distilled water, glacial acetic acid and other raw materials.
      Preparation of precursor: Add a certain amount of industrial grade magnesium oxide, heavy alkylbenzene, mixed trimethylbenzene, terpene resin, oleic acid, distilled water, and glacial acetic acid to the reactor, heat up to 105 ℃ with stirring, keep the reaction temperature at 2.5 hours, and use a water separation device to remove water from the reaction system to obtain nano magnesium oxide precursor.

      Product preparation: Heat the above-mentioned nano magnesium oxide precursor to 230 ℃, continuously remove the mixed trimethylbenzene in the system during this heating process, then continue to heat up to 330 ℃ and hold for 3 hours. Collect the evaporated solvent and water generated during the reaction process, and the resulting product is a brownish gray transparent fluid containing a certain amount of magnesium. Further vacuum distillation concentration can yield products with different magnesium contents (such as 25%, 35%, and 45%). These products are all semi transparent fluids with good fluidity, good storage stability, and no particle precipitation after 12 months of storage. They do not precipitate when in contact with water and have good dispersibility in oil without any insoluble substances.

2. Preparation method of yttrium based oil soluble high-temperature vanadium inhibitor

      Raw material preparation: Prepare sulfonic acid (such as petroleum sulfonic acid, alkylbenzene sulfonic acid), base oil (mineral oil), solvent (xylene, C9 heavy aromatic hydrocarbons, etc.), methanol, yttrium oxide, water, ammonia water and other raw materials.
      Acid base reaction: Mix a certain amount of sulfonic acid, base oil, solvent, methanol, and yttrium oxide evenly, and conduct the acid base reaction at 20-80 ℃ (preferably 40-55 ℃) for more than 15 minutes.
      Carbonation reaction: Add a certain amount of water and ammonia water to the above product and introduce carbon dioxide for reaction. After introducing carbon dioxide for 20-60 minutes, add a certain amount of water and ammonia water again and continue the reaction for 30-60 minutes. The introduction rate of carbon dioxide is 100-160L/min/kg sulfonic acid (preferably 120-140L/min/kg sulfonic acid), and the reaction temperature is 20-80 ℃ (preferably 60 ℃).

      Product preparation: Filter the above reaction products to obtain yttrium based oil soluble high-temperature vanadium inhibitor. The yttrium content of the inhibitor is 5-20mg/kg (preferably 10-20mg/kg), with a density of 0.9-1.0g/cm ³ at 20 ℃, a flash point ≥ 70 ℃, a kinematic viscosity of 62-67mm ²/s at 100 ℃, and mechanical impurities<0.05%.

3. Preparation method of high magnesium vanadium inhibitor containing dispersant

      Raw material preparation: Prepare organic solvents (toluene or xylene), low molecular weight alcohols (methanol, ethylene glycol, or n-butanol), phenolic substances (sulfurized alkylphenol salts or C-C ₂ alkylphenols), long-chain alkylbenzene sulfonic acid, heavy alkylbenzene sulfonic acid, fuel oil, low molecular weight acids (formic acid or acetic acid), C ₁₀ - C ₁₈ fatty acids (such as nutmeg acid), polyoxyethylene fatty acid esters, fatty alcohol polyoxyethylene ethers, magnesium oxide, water and other raw materials.
      Magnesium oxide fractionation: Divide magnesium oxide into three parts according to a certain proportion, namely the first part of magnesium oxide, the second part of magnesium oxide, and the third part of magnesium oxide.
      Moisture content: Divide water into four parts according to a certain proportion, namely the first part, the second part, the third part, and the fourth part.
      Neutralization reaction: Mix organic solvents, low molecular weight alcohols, phenolic substances, long-chain alkylbenzenesulfonic acid, heavy alkylbenzenesulfonic acid, C ₁₀ - C ₁₈ fatty acids, polyoxyethylene fatty acid esters, polyoxyethylene ether of fatty alcohols, fuel oil, and the first magnesium oxide to form a mixture. Heat it up to 40-110 ℃ to undergo neutralization reaction.
      Carbon dioxide injection: After neutralization reaction, low molecular weight acid, second magnesium oxide, and first water are added to the mixture, and carbon dioxide is continuously injected for a period of time; After adding the second water, continue to introduce carbon dioxide for a period of time; After adding the third part of magnesium oxide and the third part of water again, continue to introduce carbon dioxide for a period of time; Add the fourth water again and continue to introduce carbon dioxide for a period of time. The total amount of carbon dioxide introduced is 80% -100% of the total consumption of magnesium oxide, and the proportion of carbon dioxide introduced in sequence is 0%: 2-25%: 36-40%: 54-60%, with a ventilation rate of 80-120ml/min.

      Product preparation: After ventilation is completed, maintain the temperature of the mixture at 90-110 ℃ for dealcoholization treatment. After dealcoholization of low molecular weight alcohols and water, dilute and centrifuge to obtain a centrifugal solution; Vacuum distillation of centrifugal liquid is carried out to remove organic solvents and obtain vanadium inhibitors with high magnesium content. The centrifugation speed is 1800 revolutions per minute, the centrifugation time is 40 minutes, and the turbidity of the clear liquid is controlled to be less than 5NTU.

4. Preparation method of vanadium inhibitor for oleophilic carbon black carrier

      Carbon black oxidation: using oxidants (such as nitric acid, hydrogen peroxide, etc.) to oxidize carbon black particles, increasing the oxygen content on the surface of the carbon black particles, making them more hydrophilic, and facilitating subsequent reactions with magnesium salt solutions.
      Mixed drying: Mix oxidized carbon black with magnesium salt solution and dry the mixture to obtain a dry mixture of oxidized carbon black and magnesium salt.
      Baking: Heating and roasting the dried mixture under a flowing inert gas (such as argon, helium, or nitrogen) to produce a lipophilic vanadium corrosion inhibitor. The inhibitor includes lipophilic carbon black carrier particles and magnesium attached to the carbon carrier particles. The carbon black carrier particles have a particle size of less than 40nm, an oxygen content of less than 1.0 weight percent, an ash content of less than 0.5 weight percent, a surface area of at least 50m ²/g, and a magnesium content of at least 0.05 to 20 weight percent magnesium oxide.
      The preparation methods of vanadium inhibitors vary, and different methods are suitable for different industrial scenarios and needs. With the continuous advancement of technology and the sustained development of industry, the preparation technology of vanadium inhibitors will also continue to innovate and improve. In the future, we are expected to see more efficient, environmentally friendly, and economical methods for preparing vanadium inhibitors, providing a more solid guarantee for the safety, stability, and sustainable development of industrial production.