Refinement of Hydroxyethyl cellulose
Refinement of Hydroxyethyl cellulose
Hydroxyethyl cellulose (known as HEC) is a white or light yellow, odorless, non-toxic fibrous or powdered nonionic, manufactured through etherification of alkali cellulose and ethylene oxide (or chlorohydrin). HEC is soluble in both cold and hot water, and has no gel characteristics. It has a wide range of substitution, solubility and viscosity, good heat stability (below 140 ° C), and no precipitation under acidic conditions. HEC solution can form transparent film. It has non-ionic characteristics which are not compatible with positive and negative ions and good compatibility. So it can be used as coating agent, binder, cement and gypsum auxiliary, thickener, suspending agent and medicine, excipients, antifogging agents, oil well fracturing fluids, drilling treatment agents, fiber and paper sizing agents, cosmetics, toothpaste, etc. It plays an important role in the development of the social economy and is one of the fastest growing cellulose ethers in recent years.
After the end of HEC etherification, refining is required. The refining process includes neutralization, cross-linking, washing, filtration and drying. The neutralization agent is usually an organic acid such as one or more of acetic acid, propionic acid, and formic acid.
When neutralized with an organic acid such as acetic acid, propionic acid or formic acid, the following disadvantages are obtained:
1. the material after the neutralization has a swelling phenomenon, and the appearance is thick, the material has a certain viscosity, which will block the filter cloth;
2. the water content of the material is large, reaching about 65-80%, and when the filter cake is formed by centrifuge or filter press, it will be squeezed too densely and strictly because the material has a certain degree of swelling. When the washing liquid continuously enters the filter cake to wash, the pressure of washing liquid reaches the highest pressure that the filter press can withstand. Therefore, the flow rate of the washing liquid is small, and the operation flexibility of the device is small;
3. Because the molecular weight of the organic acid is large, the solubility of the formed sodium salt in the washing solvent is low, and the ash content of the product cannot be reduced to less than 5% after washing. So the moisture content of the material is high when enter dryer, which might needs wash and dry again.
4. After drying, the material is relatively hard and coarse due to twice washing and drying. During the pulverization process, the pulverization load is large, and the temperature at the top of the pulverizer reaches 80 °C and 120 °C, which reduces the pulverizing ability.
In summary, the current use of organic acid as a neutralizing agent leads to complicated subsequent processing, high production cost, and low quality of the obtained hydroxyethyl cellulose refined product.
The other neutralization agent commonly used is mineral acid with concentration of 15-90%, which can effectively remove the alkaline substance in the slurry of crude hydroxyethyl cellulose. The concentration inorganic acid is preferably at 35-50% and 40-50% is the best. The inorganic acid is at least one or several kinds of sulfuric acid, phosphoric acid, nitric acid, or hydrochloric acid. When the material is neutralized by inorganic acid, the following advantages are obtained:
1. The appearance of the material after the neutralization is in the form of sand, suspended in the solvent after the etherification reaction, thus can be continuously washed by the drum type continuous filter press washing device. The materials are uniformly distributed on the filter net, washed under a certain pressure with an aqueous organic solvent, washing and separating simultaneously. Moreover, the washing pressure of each section is not high when washing, which is favorable for the flexibility of the filter press.
2. Inorganic acid is cheaper than organic acid, easier to buy from the market, and has a stable source and quality assurance.
3. After the inorganic acid neutralized material is washed, dried and pulverized, the appearance of the product has high whiteness and dispersibility, and the product stability is relatively good. In addition, the continuous production line greatly improves the production efficiency, reduces the labor intensity of workers, improves the intrinsic safety of the production line, and reduces the consumption of energy and raw materials.
What Are Methyl Hydroxyethyl Cellulose Uses
Methyl Hydroxyethyl Cellulose, also known as Methylcellulose and colloquium, is an organic compound methyl hydroxyethyl cellulose uses in various cosmetic and medical applications, the primary one being as a thickening agent. In decorative applications, it's found most often as a component of toothpaste and cough syrups. The compound is tasteless and odorless, and in medicine, it is ingested by patients to relieve constipation, diarrhea, and hemorrhoids. Here are top uses methyl hydroxyethyl cellulose
1. Thickening agent
Methyl hydroxyethyl cellulose uses to thickener in cosmetic products such as shampoos and conditioners because it can form a film on hair strands. This film makes hair appear smooth and shiny. In addition, the material coats the hair strands to protect them from water damage. Because it is water-soluble, methyl hydroxyethyl cellulose does not cause build-up on hair strands after repeated use of the product containing it.
2. Medicine
You may have taken methyl hydroxyethyl cellulose without even knowing it. That's because this substance has been used in manufacturing pharmaceutical products for decades. It works as an excipient (a sense included with an active drug that binds together all ingredients). Furthermore, methyl hydroxyethyl cellulose can be used to coat pills and help slow down their release into the body.
3. Binding agent
Methyl hydroxyethyl cellulose is an excellent binding agent or adhesive because it forms a gel when mixed with water. The substance is often used in the manufacture of pills and capsules because it binds together different pill components to create uniform tablets that are easy to swallow.
4. Paper Production
Due to the low toxicity of the compound and its ability to improve the properties of paper while decreasing production costs, MHE has gained wide acceptance in the paper manufacturing industry. It can be used as a dry strength agent in paper production to increase tensile strength without increasing gram mage; it can also be used as a pigment binder in paper coatings and water retention agents in paper due to its good properties as a dispersing agent.
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5. Dispersing Agent.
When mixed with other chemicals, this compound works as a dispersing agent because it absorbs water to form a gel while keeping the ingredients in suspension. This makes it useful in various applications, including household products like laundry detergent, foods like whipped cream, cosmetics like toothpaste, and pharmaceuticals like cough syrups or eye drops.
6. Soil Stabilizers.
Methyl hydroxyethyl cellulose (MHEC) is used as a soil stabilizer to increase the yield of crops on marginal land and in areas where irrigation is not practical. The product can be mixed with water and applied to soil to improve moisture retention during dry periods or when rainfall is sparse. When incorporated into fertilizer formulas, MHEC allows nutrients to remain available to plants over more extended periods than untreated fertilizers.
7. Moisturizer and surfactant
Methyl hydroxyethyl cellulose (MHEC) is also used as a moisturizer and surfactant in cosmetics, baby lotions, shampoos, and bath oils. A surfactant is a wetting agent that lowers the surface tension of liquids and allows them to spread over a surface. It can be used as an emulsifier that keeps water-based and oil-based ingredients mixed in cosmetics.
8. Herbicide
Some farmers use Methylcellulose as an herbicide. When mixed with water and sprinkled on certain plants, it can help prevent growth or kill the plant entirely. The gel-like substance helps the herbicide stay in place without being washed away by water or carried away by the wind.
9. Concrete Mixes
Concrete mixes using Methylcellulose are commonly used for their smoothness and strength. Methylcellulose is used to coat the interior surface of concrete pipes, giving them a uniform thickness that reduces wear over time. This method also produces lines resistant to cracking when exposed to water, heat, or other harsh conditions.
10 Food Production
Methylcellulose is commonly used as an ingredient in the production of commercially-made ice cream due to its ability to stabilize the product. It serves as an alternative to gelatin and vegetable gum such as guar gum and locust bean gum. The chemical compound is also added to baked goods, salad dressings, and salad gums. It helps prevent sugar crystallization and increases the shelf life of food products by controlling moisture content.
11. Cement
Methylcellulose helps increase the efficiency of cement by prolonging water retention and hydration reactions. This helps reduce the amount of glue required during construction projects, ultimately lowering costs. The chemical compound can also be added to concrete mixes to improve their structural properties, such as flexural strength, compressive strength, and tensile strength.
12. Oil drilling
Methyl hydroxyethyl cellulose uses is also used in oil drilling operations to thicken liquids used in the exploration process. This helps ensure that the fluid can be pumped through pipes without dripping or spilling, making them less effective at their intended function.
13. Cosmetics
Methyl hydroxyethyl cellulose is found in many cosmetic products, including hair sprays, shampoos, conditioners, toothpaste, and soaps. Like other uses for methyl hydroxyethyl cellulose, it's used to increase the viscosity of these products and make them easier to apply.
14. Paints and coatings
Methyl hydroxyethyl cellulose, also known as MHEC and Methylcellulose, is a thickening agent used in paints and coatings. The chemical compound can help prevent paint from sagging and dripping when it dries. The combination can also help provide the color with extra adhesion, making it helpful in constructing buildings. MHEC is commonly used as a thickening agent in decorative paints. Decorative paints are not as strong as structural paints, so they need thickening agents to help them adhere to walls and other surfaces without breaking apart or peeling away. MHEC provides water resistance to decorative paints, making it more difficult for walls to become damaged by exposure to water. It also helps make paint that has been applied easier to clean.
Wrapping Up
The most significant methyl hydroxyethyl cellulose uses include its use in the production of adhesives, cosmetics, paper and textiles, pharmaceuticals, paint, and a host of other industrial applications.
If you want to learn more, please visit our website Hydroxy Ethyl Methyl Cellulose.
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