Ethoxylation

In organic chemistry, ethoxylation is a chemical reaction in which ethylene oxide (Template:Chem2) adds to a substrate. It is the most widely practiced alkoxylation, which involves the addition of epoxides to substrates.

In the usual application, alcohols and phenols are converted into Template:Chem2, where n ranges from 1 to 10. Such compounds are called alcohol ethoxylates. Alcohol ethoxylates are often converted to related species called ethoxysulfates. Alcohol ethoxylates and ethoxysulfates are surfactants, used widely in cosmetic and other commercial products.<ref name=Ullmann>Template:Cite book</ref> The process is of great industrial significance, with more than 2,000,000 metric tons of various ethoxylates produced worldwide in 1994.<ref name="Cahn1994">Template:Cite book</ref>

Production

The process was developed at the Ludwigshafen laboratories of IG Farben by Conrad Schöller and Template:Ill during the 1930s.<ref>Template:Cite journal</ref><ref>Template:Cite patent</ref>

Alcohol ethoxylates

Industrial ethoxylation is primarily performed upon alcohols. Lower alcohols react to give glycol ethers which are commonly used as solvents, while longer fatty alcohols are converted to fatty alcohol ethoxylates (FAE's), which are a common form of nonionic surfactant. The reaction typically proceeds by blowing ethylene oxide through the alcohol at 180 °C and under 1-2 bar of pressure, with potassium hydroxide (KOH) serving as a catalyst.<ref name="method">Template:Cite journal</ref> The process is highly exothermic (ΔH = -92 kJ/mol of ethylene oxide reacted) and requires careful control to avoid a potentially disastrous thermal runaway.<ref name="method" />

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The starting materials are usually primary alcohols as they tend to react 10–30× faster than secondary alcohols do.<ref>Template:Cite journal</ref> Typically 5-10 units of ethylene oxide are added to each alcohol,<ref name=UllmannSurf>Template:Cite book</ref> however ethoxylated alcohols can be more prone to ethoxylation than the starting alcohol, making the reaction difficult to control and leading to the formation of a product with varying repeat unit length (the value of n in the equation above). Better control can be afforded by the use of more sophisticated catalysts,<ref>Template:Cite journal</ref> which can be used to generate narrow-range ethoxylates. Ethoxylated alcohols are considered to be a high production volume (HPV) chemical by the US EPA.<ref name=EPA>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Ethoxylation/propoxylation

Ethoxylation is sometimes combined with propoxylation, the analogous reaction using propylene oxide as the monomer. Both reactions are normally performed in the same reactor and may be run simultaneously to give a random polymer, or in alternation to obtain block copolymers such as poloxamers.<ref name="method" /> Propylene oxide is more hydrophobic than ethylene oxide and its inclusion at low levels can significantly affect the properties of the surfactant. In particular ethoxylated fatty alcohols which have been 'capped' with ~1 propylene oxide unit are extensively marketed as defoamers.

Ethoxysulfates

Ethoxylated fatty alcohols are often converted to the corresponding organosulfates, which can be easily deprotonated to give anionic surfactants such as sodium laureth sulfate. Being salts, ethoxysulfates exhibit good water solubility (high HLB value). The conversion is achieved by treating ethoxylated alcohols with sulfur trioxide.<ref>Template:Cite journal</ref> Laboratory scale synthesis may be performed using chlorosulfuric acid:

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The resulting sulfate esters are neutralized to give the salt:

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Small volumes are neutralized with alkanolamines such as triethanolamine (TEA).<ref name="HERA2004">Template:Cite bookTemplate:Page needed This 36 page report is an HERA document on this ingredient in European household cleaning products.</ref>Template:Page needed

In 2008, 381,000 metric tons of alcohol ethoxysulfates were consumed in North America. Lauryl Alcohol Ethoxylate Analysis with Gas Chromatography (GC)

For the analysis of Lauryl Alcohol Ethoxylate using Gas Chromatography (GC), the selection of a suitable GC column depends on the specific ethoxylation level and the volatility of the compound. In general, Lauryl Alcohol Ethoxylates are non-volatile or semi-volatile, so derivatization might be necessary before GC analysis. Here are some column options for analysis after derivatization (acetylation): 1. Non-polar columns (like DB-1, HP-1, or RTX-1):

These are made of 100% dimethylpolysiloxane. Suitable for analyzing relatively non-polar, derivatized alcohol ethoxylates. Common dimensions: 30 m length, 0.25 mm ID, 0.25 μm film thickness.

2. Mid-polarity columns (like DB-5, HP-5, or RTX-5): These are 5% phenyl, 95% dimethylpolysiloxane. They offer slightly better separation of ethoxylates with varying chain lengths. Common dimensions: 30 m length, 0.25 mm ID, 0.25 μm film thickness.

3. Polar columns (like DB-WAX or HP-FFAP): These are polyethylene glycol (PEG) columns. They are more suited for polar compounds, but Lauryl Alcohol Ethoxylates may still need derivatization. The DB-5 or HP-5 column is often preferred for surfactants like ethoxylates due to its moderate polarity, providing good separation of ethoxylation products.

It's essential to consider the specific range of ethoxylation (number of ethylene oxide units) to optimize the method further. Additionally, derivatization can help in improving volatility and peak shape.

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Other materials

Although alcohols are by far the major substrate for ethoxylation, many nucleophiles are reactive toward ethylene oxide. Primary amines will react to give di-chain materials such as polyethoxylated tallow amine. The reaction of ammonia produces important bulk chemicals such as ethanolamine, diethanolamine, and triethanolamine.

Applications of ethoxylated products

Alcohol ethoxylates (AE) and alcohol ethoxysulfates (AES) are surfactants found in products such as laundry detergents, surface cleaners, cosmetics, agricultural products, textiles, and paint.<ref name="Federle">Template:Cite journal</ref>Template:Primary source inline

Alcohol ethoxylates

As alcohol ethoxylate based surfactants are non-ionic they typically require longer ethoxylate chains than their sulfonated analogues in order to be water-soluble.<ref name="VaradarajBock1994">Template:Cite journal</ref> Examples synthesized on an industrial scale include octyl phenol ethoxylate, polysorbate 80 and poloxamers. Ethoxylation is commonly practiced, albeit on a much smaller scale, in the biotechnology and pharmaceutical industries to increase water solubility and, in the case of pharmaceuticals, circulatory half-life of non-polar organic compounds. In this application, ethoxylation is known as "PEGylation" (polyethylene oxide is synonymous with polyethylene glycol, abbreviated as PEG). Carbon chain length is 8-18 while the ethoxylated chain is usually 3 to 12 ethylene oxides long in home products.<ref name="HERA">Template:Cite bookTemplate:Page needed See preceding HERA reference for explanation of the publishing organisation. This 244 page book is the latest HERA document on ingredients of European household cleaning products.</ref>Template:Page needed They feature both lipophilic tails, indicated by the alkyl group abbreviation, R, and relatively polar headgroups, represented by the formula Template:Chem2.

Alcohol ethoxysulfates

AES found in consumer products generally are linear alcohols, which could be mixtures of entirely linear alkyl chains or of both linear and mono-branched alkyl chains.<ref name = "HERA2003">Template:Cite bookTemplate:Page needed See preceding HERA reference for explanation of the publishing organisation. This 57 page report is the latest HERA document on this ingredient of European household cleaning products. Note, the HERA web site, [1], access date as above, bears the December date; the document bears a date of January 2003.</ref>Template:Page needed A high-volume example of these is sodium laureth sulfate a foaming agent in shampoos and liquid soaps, as well as industrial detergents.Template:Citation needed

Environmental and safety

Alcohol ethoxylates (AEs)

Human health

Alcohol ethoxylates are not observed to be mutagenic, carcinogenic, or skin sensitizers, nor cause reproductive or developmental effects.<ref name="Fruijtier-Pölloth2005">Template:Cite journal</ref> One byproduct of ethoxylation is 1,4-dioxane, a possible human carcinogen.<ref name="StickneySager2003">Template:Cite journal</ref> Undiluted AEs can cause dermal or eye irritation. In aqueous solution, the level of irritation is dependent on the concentration. AEs are considered to have low to moderate toxicity for acute oral exposure, low acute dermal toxicity, and have mild irritation potential for skin and eyes at concentrations found in consumer products.<ref name=HERA /> Recent studies have found dried AE residues similar to what would be found on restaurant dishes (as effective concentrations from 1:10,000 to 1:40,000) killed epithelial intestinal cells at high concentrations. Lower concentrations made cells more permeable and prone to inflammatory response.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Aquatic and environmental aspects

AEs are usually released down the drain, where they may be adsorbed into solids and biodegrade through anaerobic processes, with ~28–58% degraded in the sewer.<ref name=Prats>Template:Cite journal</ref>Template:Primary source inline The remaining AEs are treated at waste water treatment plants and biodegraded via aerobic processes with less than 0.8% of AEs released in effluent.<ref name=Prats /> If released into surface waters, sediment or soil, AEs will degrade through aerobic and anaerobic processes or be taken up by plants and animals.

Toxicity to certain invertebrates has a range of EC50 values for linear AE from 0.1 mg/L to greater than 100 mg/L. For branched alcohol exthoxylates, toxicity ranges from 0.5 mg/L to 50 mg/L.<ref name=HERA /> The EC50 toxicity for algae from linear and branched AEs was 0.05 mg/L to 50 mg/L. Acute toxicity to fish ranges from LC50 values for linear AE of 0.4 mg/L to 100 mg/L, and branched is 0.25 mg/L to 40 mg/L. For invertebrates, algae and fish the essentially linear and branched AEs are considered to not have greater toxicity than Linear AE.<ref name=HERA />

Alcohol ethoxysulfates (AESs)

Biodegradation

The degradation of AES proceeds by ω- or β-oxidation of the alkyl chain, enzymatic hydrolysis of the sulfate ester, and by cleavage of an ether bond in the AES producing alcohol or alcohol ethoxylate and an ethylene glycol sulfate. Studies of aerobic processes also found AES to be readily biodegradable.<ref name = HERA2004 /> The half-life of both AE and AES in surface water is estimated to be less than 12 hours.<ref>Template:Cite journal</ref>Template:Primary source inline The removal of AES due to degradation via anaerobic processes is estimated to be between 75 and 87%.

In water

Flow-through laboratory tests in a terminal pool of AES with mollusks found the NOEC of a snail, Goniobasis and the Asian clam, Corbicula to be greater than 730 ug/L. Corbicula growth was measured to be affected at a concentration of 75 ug/L.<ref>Template:Cite journal</ref>Template:Primary source inline The mayfly, genus Tricorythodes has a normalized density NOEC value of 190 ug/L.<ref name="van de Plasschede Bruijn1999">Template:Cite journal</ref>Template:Primary source inline

Human safety

AES has not been found to be genotoxic, mutagenic, or carcinogenic.<ref name = HERA2003 /> A 2022 study revealed the expression of genes involved in cell survival, epithelial barrier, cytokine signaling, and metabolism were altered by rinse aid in concentrations used in professional dishwashers. The alcohol ethoxylates present in the rinse aid were identified as the culprit component causing the epithelial inflammation and barrier damage.<ref>Template:Cite journal</ref>

References

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