Overview of SLS Sodium Lauryl Sulfate
Sodium dodecyl sulfate is a type of anionic surfactant, a typical representative of sulfate surfactants, abbreviated as SDS, also known as AS, K12, sodium coconut oil sulfate, sodium lauryl sulfate, and foaming agent. The product is white to slightly yellow crystalline powder, non-toxic, slightly soluble in alcohol, insoluble in chloroform and ether, easily soluble in water, and have good compatibility with anions and non-ions, with good emulsifying and foaming properties Foaming, penetration, stain removal, and dispersion properties, rich foam, fast biodegradation, but lower water solubility than fatty alcohol polyoxyethylene ether sodium sulfate (AES). Not sensitive to alkali and hard water, but less stable than general sulfonates under acidic conditions, close to AES. Long term heating should not exceed 95 ℃. Irritability in surfactants is moderate, with a 10% solution irritation index of 3.3, higher than AES and lower than sodium dodecylbenzenesulfonate (LAS).
The toxicity LD50 is 1300mg/kg. There is currently no evidence to prove that this product is carcinogenic, and high doses may indeed irritate the skin. However, when used as a foaming agent in general bathroom products, the concentration is limited and it complies with the standards of various countries around the world, so there is no need to worry. Sodium dodecyl sulfate is the main component of dishwashing detergent. Commonly used in DNA extraction processes to separate proteins from DNA after denaturation. Usually misread as sodium dodecyl sulfonate. As a foaming agent, it is widely used in toothpaste, soap, bath solution, shampoo, laundry detergent, and cosmetics. 95% of personal skincare and home cleaning products contain sodium dodecyl sulfate.
Properties of SLS Sodium Lauryl Sulfate
Melting Point: 204-207℃(lit.)
Density: 1.03g/ml at 20℃
Flash Point: >100℃
Storage Conditions: 2-8℃
Solubility: H2O: 0.1M, transparent to nearly transparent, colorless to slightly yellow
Form: Powder or crystal
Color: White to light yellow
Odor: Slight fatty odor
PH Value: 6-9 (10g/L, H2O, 20℃)
Water Solubility: ca.150g/L (20℃)
Performance of SLS Sodium Lauryl Sulfate
White powder or white needle shaped particles, easily soluble in water, with a krafft point of 8 ℃. Has good foaming and emulsifying properties. After encountering low temperatures, its aqueous solution precipitates white pearlescent crystals or becomes a paste.
Production Method of SLS Sodium Lauryl Sulfate
Lauryl sulfate is produced by sulfation of dodecanol and chlorosulfonic acid at 40~50 ℃, neutralization with sodium hydroxide, bleaching, sedimentation and spray drying.
The ratio of dodecanol and chlorosulfonic acid is 1:1.03, and the sulfonation reaction is carried out at 30-35 ℃. The generated sulfonic acid ester is neutralized with 30% sodium hydroxide to generate sodium dodecanol sulfate. The finished product is obtained after hydrogen peroxide bleaching and spray drying. Raw material consumption (kg/t) Lauryl alcohol (C12>85%) 725 solid alkali (NaOH>95%) 183 chlorosulfonic acid (>95%) 458
There are many methods for preparing sodium dodecyl sulfate, and currently the most commonly used are the following two. The sulfur trioxide method reaction device is a vertical reactor. Enter nitrogen into the reactor through the gas nozzle at 32 ℃. The nitrogen flow rate is 85.9L · min-1. Inject lauryl alcohol at 82.7kPa with a flow rate of 58g · min-1. Feed liquid sulfur trioxide into the flash evaporator at 124.1kPa, maintain the flash temperature at 100 ℃, and control the sulfur trioxide flow rate at 0.9072kg · h-1. Then rapidly cool the sulfated product to 50 ℃, transfer it into an aging machine Chemicalbook, and let it stand for 10-20 minutes. Finally, inject into the neutralization kettle and neutralize with alkali. The neutralization temperature is controlled at 50 ℃, and the liquid product is obtained by discharging when the pH value reaches 7-8.5. Spray dry the solid product. The chlorosulfonation intermittent method is used to add lauryl alcohol into the reactor and preheat it to 30 ℃. Then, under high-speed stirring, spray an excess of 0.03mol of chlorosulfonic acid into the alcohol in a mist form. The reaction temperature should be controlled between 30-35 ℃. After the sulfation reaction is completed, transfer it into a neutralization kettle and neutralize it with 30% alkaline solution to a pH value of 7-8.5. Finally, bleach with 0.4% (mass) hydrogen peroxide. The spray dries to a solid.
It can also be prepared into a solution according to quality standards. The continuous method reaction device is a tubular reactor. Firstly, saturate lauryl alcohol with hydrogen chloride. Lauryl alcohol enters the saturation chamber through a metering device at a flow rate of 334g · min-1, while hydrogen chloride enters the chamber at a flow rate of 40.5g · min-1. Then, the hydrogen chloride solution of lauryl alcohol was introduced into the reactor to react with chlorosulfonic acid at 21.4 ℃. After gas-liquid separation of the reactants, the sulfated products flow into the neutralization kettle from the bottom of the separator. Neutralize the liquid product with 30% sodium hydroxide at 50 ℃. The solid product is obtained by spray drying.
Technical Parameter of SLS Sodium Lauryl Sulfate
| Product Name |
Short Name |
Molecular weight |
PH |
CAS |
Appearance |
| Sodium Lauryl Sulfate |
SLS |
288.38 |
N/A |
151-21-3 |
White to light yellow powder |
Application of SLS Sodium Lauryl Sulfate
Sodium lauryl sulfate has excellent decontamination, emulsification and foaming power, which can be used as detergent and textile auxiliaries, as well as anionic surfactant, toothpaste foaming agent, mine fire extinguishing agent, foaming agent for fire extinguishers, lotion polymerization emulsifier, pharmaceutical emulsion dispersant, hair shampoo and other cosmetics, wool detergent, and detergent for fine silk and wool fabrics. Flotation agents for metal beneficiation.
(The application of SLS sodium lauryl sulfate in detergent)
1. Surfactants, detergents, foaming agents, wetting agents, etc.
2. Low grade ion pair reagents are cheaper than heptane and sodium pentanesulfonate when not required to be high.
3. As raw materials, material modification.
4. Capillary electrophoresis analysis, additives, generally used in molar solutions.
5. Other analytical methods will also be used, such as flow column analysis.
6. Washing and textile auxiliaries, also used as toothpaste foaming agent, fire extinguishing foam liquid, lotion polymerization emulsifier, pharmaceutical emulsion dispersant, shampoo and other cosmetics, wool detergent.
7. Biochemical analysis, electrophoresis, ion pair reagents.
8. Processing aids for the food industry. Foaming agent; Emulsifiers; Anionic surfactants. Used for cakes, beverages, protein, fresh fruits, fruit juice beverages, edible oils, etc.
Company Profile
Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) is a trusted global chemical material supplier & manufacturer with over 12-year-experience in providing super high-quality chemicals and nanomaterials, including boride powder, nitride powder, graphite powder, sulfide powder, 3D printing powder, etc.
The company has a professional technical department and Quality Supervision Department, a well-equipped laboratory, and equipped with advanced testing equipment and after-sales customer service center.
If you are looking for high-quality SLS Sodium Lauryl Sulfate, please feel free to contact us or click on the needed products to send an inquiry.
Packing of SLS Sodium Lauryl Sulfate
1kg/bottle, 25kg/barrel, or 200kg/ barrel.
We have many different kinds of packing which depend on the quantity.
Payment Methods of SLS Sodium Lauryl Sulfate
L/C, T/T, Western Union, Paypal, Credit Card etc.
Shipment of SLS Sodium Lauryl Sulfate
By sea, by air, by express as soon as possible once payment receipt.
FAQ
Q1
Are sls and sds the same thing?
Re:
SLS (sodium lauryl sulfate) and SDS (sodium lauryl sulfate) are not the same substance. Although they are both surfactants, their chemical structures and uses differ. SLS is commonly known as sodium lauryl sulfate, while SDS is known as sodium lauryl sulfate. Although the two have similar names, their chemical formulas are different, which are C12H25SO4Na and C12H25SO4Na respectively.
Q2
Is SLS harmful to humans?
Re:
SLS is safe under normal concentrations and conditions of use, but if the concentration is too high or overused for a long time, it may irritate the skin or cause dryness, roughness and other problems. In addition, SLS is a moderately toxic substance that can cause acute toxic reactions such as irritation to the skin, eyes, mucous membranes, stomach, and upper respiratory tract. Therefore, when using products containing SLS, attention should be paid to the method and frequency of use.
Q3
What are the storage and usage considerations for SLS?
Re:
SLS should be stored in a closed container in a cool, dry place away from strong oxidants. At the same time, SLS is stable under normal storage conditions, but may be hydrolysed under acidic conditions, resulting in a decrease in the content of its active ingredients. Therefore, avoid placing it in an acidic environment.
Q4
What is the difference between SLS and SLES?
Re:
SLES (sodium lauryl ether sulfate sulfonic acid) is also a commonly used surfactant and has roughly the same purpose as SLS. The main differences between the two are slight differences in chemical structure and properties, but overall they work similarly in cleaning products.
Q5
Is SLS safe to use in shampoo?
Re:
It is common to use SLS in shampoo, but it is important to note that SLS may cause skin irritation or allergic reactions in some sensitive people. Therefore, when choosing a shampoo, it is recommended to choose it according to your personal skin type and needs, and follow the product instructions for use.
