OBS-50 Octadecyl Benzenesulfonic Acid CAS 27177-79-3

OBS-50, a sulfate anionic detergent is a brand new surfactant. It is easily soluble, dispersible, compatible with hard water, and has high electrolyte stabile.Formula moléculaire: C24H41NaO3S

Description of OBS-50 Octadecyl Benzenesulfonic Acid：

Physical state and appearance: octadecyl benzene sulfonic acid is a white or light yellow powder with certain hygroscopicity.

Solubility is easily soluble in water and organic solvents such as low alcohols, ethers, and petroleum hydrocarbons. In an aqueous solution, octadecyl benzene sulfonic acid can be ionized into negatively charged ions, making it surface active.

Acid alkalinity and ionization: Octadecyl benzene sulfonic acid is a strong acid with a high degree of ionization. Its sodium salt (sodium octadecyl benzene sulfonate) has a high solubility in water, so in practical applications, it is often used in sodium salt form.

Turbidity point and HLB value: With the increase of alkyl carbon number, the turbidity point increases. When the carbon number reaches 18, the turbidity point is about 80℃. In addition, octadecyl benzene sulfonic acid has a lower HLB value of about 1.9, giving it a lower hydrophilicity.

Surface tension and critical micelle concentration: At lower concentrations, octadecyl benzene sulfonic acid can significantly reduce the surface tension of water. When the concentration increases, the surface tension first decreases rapidly with the increase of concentration and then tends to flatten out. The critical micelle concentration (CMC) is the concentration at which surfactant molecules begin to form micelles. The CMC value of octadecyl benzene sulfonic acid is low, about 0.005%.

Stability and oxidation resistance:

• Octadecyl benzene sulfonic acid is stable in weakly acidic and neutral media.

• It will hydrolyze in an alkaline medium.

• It is prone to oxidative degradation under the action of oxidizing agents.

Biodegradability: Although octadecylbenzene sulfonic acid is not easily degraded by microorganisms in the natural environment, studies have shown that some microorganisms have a certain ability to degrade it.

Toxicity and safety: octadecylbenzene sulfonic acid has certain toxicity; long-term exposure may cause irritation or damage to the skin, eyes, and respiratory system. Therefore, appropriate protective measures should be taken during use.

 Technical Parameter of SMAS Sodium 2-methylprop-2-ene-1-sulfonate:

Applications of OBS-50 Octadecyl Benzenesulfonic Acid:

Surface treatment and cleaning: octadecyl benzene sulfonic acid has excellent wetting, emulsification, decontamination, and dispersion properties and can be used for metal, glass, plastic, and other surface cleaning, rust prevention, degreasing, and passivation treatment. It can effectively remove stains, oil, and rust and improve the surface finish and corrosion resistance.

Petroleum industry: In the petroleum industry, octadecyl benzene sulfonic acid is mainly used as an additive for drilling fluids, improving the lubricity and stability of drilling fluids and preventing problems such as drill bit wear and sticking. In addition, it can also be used as a crude oil demulsifier to reduce the viscosity of crude oil and improve oil recovery efficiency.

Textile and printing: In the textile and printing industry, octadecyl benzene sulfonic acid can be used as a dye dispersant, softening agent, antistatic agent and other additives. It can improve dyes' dispersion and coloring effect and improve fabrics' softness and antistatic properties. It can also be used as a treatment agent for printing and dyeing wastewater.

Pesticides and fertilizers: In the production of pesticides and fertilizers, octadecyl benzene sulfonic acid can be used as additives and wetting agents to help pesticides better adhere to the surface of plants, improve the utilization rate of pesticides and control effects. At the same time, it can also be used as a fertilizer suspension agent to improve fertilizer solubility and nutrient utilization.

Synthetic rubber and polymer materials: In synthetic rubber and polymer materials, octadecyl benzene sulfonic acid can be used as emulsifiers, dispersants and plasticizers. It can improve the processing properties, mechanical properties, and durability of the material and improve the quality and stability of the product.

Water treatment and sewage treatment: octadecyl benzene sulfonic acid can be used as a flocculant, dispersant and stabilizer in water treatment and sewage treatment applications. It can effectively remove impurities, suspended matter and harmful substances in water, improve water quality, and be used as a dehydrating agent and stabilizer of sludge.

Preparation of nanomaterials: In preparing nanomaterials, octadecyl benzene sulfonic acid can be used as an additive, such as a surfactant or template agent. It can control the morphology, structure, and properties of nanomaterials and improve the stability and dispersion of nanomaterials.

Biomedical engineering: In biomedical engineering, octadecylbenzene sulfonic acid can be used as an additive for applications such as drug carriers, gene delivery and tissue engineering. It can improve the targeting and bioavailability of drugs while also improving cell culture and scaffold materials for tissue engineering.

Production Method of OBS-50 Octadecyl Benzenesulfonic Acid:

Direct sulfonation method:

Direct Sulfonation is a commonly used method to produce octadecyl benzene sulfonic acid. The method is to sulfonate long-chain alkyl benzene with sulfuric acid to produce the corresponding alkyl benzene sulfonic acid. The specific steps are as follows:

a. Alkylation: First, long-chain alkyl bromine or chlorine is alkylated with hydrogen on the benzene ring to produce alkyl benzene. In this step, metal catalysts such as aluminum and zinc can be used to promote the reaction.

b. Sulfonation: under the action of sulfuric acid, alkyl benzene reacts with sulfuric acid to form alkyl benzene sulfonic acid. The sulfonation reaction usually occurs at high temperatures, with sulfuric acid acting as an oxidant and a catalyst.

The advantages of direct Sulfonation are that it is a simple process, has low equipment requirements, and is suitable for large-scale production. However, this method uses a large amount of sulfuric acid, producing a large amount of waste acid and causing certain environmental pollution. At the same time, the sulfonation reaction conditions are relatively harsh, requiring high temperature and pressure, which increases production costs and safety risks.

Chloro-sulfonation process:

Chlorosulfonation is a relatively advanced method for producing octadecyl benzene sulfonic acid. The method is to react long-chain alkyl benzene with chlorosulfonic acid to produce the corresponding alkyl benzene sulfonyl chloride and then hydrolyze it to obtain alkyl benzene sulfonic acid. The specific steps are as follows:

a. Chlorosulfonation: Reaction of long-chain alkyl benzene with chlorosulfonic acid to produce alkyl benzene sulfonyl chloride. The chloro-sulfonation reaction is carried out at a lower temperature, and catalysts such as ferric chloride and aluminum chloride are used to promote the reaction.

b. Hydrolysis: alkylbenzene sulfonyl chloride is hydrolyzed with water to produce alkylbenzene sulfonic acid. 

The advantage of chlorosulfonation is that less sulfuric acid is used, which reduces the production of waste acid and pollution to the environment. At the same time, the process conditions of chlorosulfonation are relatively mild, the production cost is low, and the safety is high. However, this method requires using toxic and harmful raw materials such as chlorine gas and sulfuryl chloride, posing a potential threat to operator health and the environment.

OBS-50 Octadecyl Benzenesulfonic Acid: Packing & shipping
OBS-50 Octadecylbenzenesulfonic Acryl Acid is available in a variety of different packaging options.
 OBS-50 Octadecyl Benzenesulfonic Acid packing: 1kg/bottle or 25kg/barrel.
 OBS-50 Octadecyl Benzenesulfonic Acid shipping: Shipping can be done by air, sea or express as soon after payment as possible.

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