ETHYLENE GLYCOL MONOBUTYL ETHER

CAS: 111-76-2 WASHING OR SURFACE REMOVAL AGENT

Ethylene glycol monobutyl ether (CAS 111-76-2) is a clear, colorless solvent with surface removal and washing functions, commonly used in industrial and cleaning applications and recognized in U.S. indirect food additive regulations.

What It Is

Ethylene glycol monobutyl ether is a synthetic chemical compound belonging to the glycol ether family of solvents. It is identified by the Chemical Abstracts Service (CAS) registry number 111-76-2 and is known by the technical names ETHYLENE GLYCOL MONOBUTYL ETHER ETHANOL and 2-BUTOXY- 2-BUTOXYETHANOL. As a glycol ether, this substance combines an ether functional group with an alcohol moiety, giving it balanced polarity that makes it an effective washing or surface removal agent. In industrial and commercial contexts, it is valued for its ability to dissolve oils, greases, and a wide range of organic materials. The compound appears as a colorless liquid with mild solvent-like odor at ambient conditions, and its physicochemical properties enable it to interact with both aqueous and organic phases. Although primarily used in non-food contexts, the regulatory framework in some jurisdictions recognizes its application in food contact or processing environments under controlled conditions, such as in washing or surface removal agents used on food contact surfaces. Ethylene glycol monobutyl ether is distinct from simple alcohols or hydrocarbons due to its glycol ether structure, which imparts solvency and surface-active characteristics. This chemical’s amphiphilic nature allows it to reduce surface tension and facilitate the removal of contaminants on substrates, explaining its classification as a surface removal agent. Its inclusion in regulatory lists for indirect food additives reflects specific allowed uses, not direct incorporation into foods themselves. The balance of hydrophilic and lipophilic character sets glycol ethers like this apart from purely hydrophobic solvents, contributing to their broad utility in formulations where both water and organic components must be engaged. In common nomenclature, this compound is often abbreviated as a type of “glycol ether” and is grouped with similar solvents used in industrial cleaners, coatings, and specialized detergents. The technical function as a washing or surface removal agent describes its role in formulations intended to clean, degrease, or prepare surfaces, rather than to impart flavor, nutrition, or preservation to food. Its physicochemical signature reflects this functional role, as it readily miscibilizes with both water and common organic solvents, enabling effective interaction with a wide range of substances and residues encountered in industrial and maintenance scenarios.

How It Is Made

Ethylene glycol monobutyl ether is manufactured through chemical synthesis routes designed to couple an alkyl glycol backbone with a butyl functional group. The predominant industrial method involves the controlled reaction of ethylene oxide with normal butanol under catalytic conditions. In this process, ethylene oxide—a strained three-membered ring epoxide—undergoes nucleophilic attack by butanol’s hydroxyl group, opening the epoxide ring and forming the butyl ether linkage with the ethylene glycol backbone. This reaction typically proceeds in the presence of acid or base catalysts specifically chosen to optimize yield and minimize side reactions. Purification of the resultant product generally includes distillation steps to remove unreacted starting materials, catalyst residues, and low-boiling impurities. The desired compound is collected at a boiling range consistent with its physical properties, ensuring that the final material meets specified purity criteria for use in industrial applications. Because glycol ethers can form peroxides upon prolonged exposure to air and light, proper storage and handling procedures are essential to maintaining product stability and ensuring safe use. Alternative synthesis routes may employ ethylene glycol directly reacting with dibutyl sulfate or related intermediates to yield the monobutyl ether, though these approaches are less common at large industrial scale due to cost and reaction efficiency considerations. Quality control in the production process is critical, as residual catalysts or by-products can influence the safety and performance characteristics of the solvent. Manufacturers typically characterize the product through analytical methods such as gas chromatography to confirm composition and detect trace impurities before release for commercial use. Although ethylene glycol monobutyl ether is not a food ingredient in the conventional sense, industrial-grade and higher-purity grades are produced to meet different regulatory and application requirements across sectors.

Why It Is Used In Food

While ethylene glycol monobutyl ether is not added directly to foods for flavor, nutrition, or preservation, it appears in regulatory frameworks as an indirect food additive where its technical function supports food processing operations. Specifically, the compound is recognized within certain sections of the U.S. Federal Food, Drug, and Cosmetic Act as part of lists of substances that may be used in food contact applications under defined conditions. As a washing or surface removal agent, its function supports the cleaning of equipment and contact surfaces that touch food, helping to remove residues, fats, and other contaminants in preparation for food production. In facilities that handle food products, effective cleaning agents are essential for maintaining sanitary conditions and preventing cross-contamination. The solvency and surface activity of ethylene glycol monobutyl ether allow it to dissolve organic residues and reduce surface tension, enhancing the removal of grime and deposits during cleaning processes. Within this context, regulatory listings identify safe conditions of use to ensure that any residues or contacts do not compromise food safety when proper rinsing or processing controls are followed. Regulatory references, such as those found in U.S. Code of Federal Regulations titles related to food packaging and food contact substances, set conditions for its inclusion in formulations that might touch food packaging materials or food processing equipment. The compound’s role is not to be consumed directly but to aid in maintaining hygienic production environments. This indirect application underscores a broader principle in food safety regulation: certain chemicals are authorized not because they contribute to food composition, but because they facilitate safe handling, cleaning, or packaging operations that ultimately protect public health when used as specified.

Adi Example Calculation

Because ethylene glycol monobutyl ether does not have an established Acceptable Daily Intake (ADI), there is no regulatory benchmark for demonstrating a hypothetical ‘safe’ intake via diet. ADI calculations are typically used for food additives that contribute directly to food composition, and they involve dividing a no-observed-adverse-effect level from animal studies by safety factors to account for uncertainties. These calculations illustrate how regulators derive exposure limits for direct ingestion. For example, if a compound with an established ADI of X mg/kg body weight per day were being evaluated, a person weighing 70 kilograms could theoretically tolerate up to 70 * X mg per day without expected adverse effects if the compound were used as a food ingredient under specified conditions. In the absence of an ADI for ethylene glycol monobutyl ether, such calculations are not applicable, and authorized use conditions emphasize limiting contact with food and ensuring thorough removal from surfaces rather than quantifying dietary exposure.

Safety And Health Research

Safety evaluations of ethylene glycol monobutyl ether have focused primarily on occupational and environmental exposure, not nutritional or physiological effects from ingestion in food. Toxicological data from animal studies and industrial hygiene research identify potential hazards associated with high-level exposures, particularly via inhalation or dermal contact. Glycol ethers as a class have been characterized for their potential to irritate the eyes, skin, and respiratory tract when appropriate protective measures are not in place, and animal studies have documented various endpoints under high-concentration exposure conditions. Much of the safety research centers on workplace exposure limits and hazard communication, where organizations such as the American Conference of Governmental Industrial Hygienists (ACGIH) provide threshold limit values to guide permissible airborne concentrations. These occupational standards are designed to protect workers from acute and chronic effects associated with repeated or prolonged exposure, reflecting the compound’s solvent activity and capacity to interact with biological tissues under non-food contact scenarios. Importantly, research evaluations pertaining to food-related contexts emphasize the need for controlled use and thorough removal of technical agents from food contact surfaces. Regulators document conditions under which indirect food contact substances may be used, with safety assessments considering the potential for residues to remain on treated surfaces. These assessments do not suggest that the compound is intended for consumption, and no authoritative evidence supports taste or nutritional contribution. Rather, safety and health research inform guidelines that delineate acceptable exposure levels in industrial and cleaning operations, underscoring rigorous sanitation protocols and exposure controls to mitigate risks.

Regulatory Status Worldwide

Ethylene glycol monobutyl ether is recognized in several regulatory frameworks for specific technical uses rather than as a direct food additive. In the United States, this compound appears in the FDA’s Inventory of Food Contact Substances, where it is listed in association with sections of the Code of Federal Regulations that govern substances used in indirect food contact applications such as components of adhesives, coatings, and cleaning agents used on food contact surfaces. These regulatory references include 21 CFR 173.315, 21 CFR 175.105, 21 CFR 176.210, 21 CFR 177.1650, and 21 CFR 178.1010, which outline conditions under which chemicals may be safely used in formulations that touch food packaging or processing equipment. The presence of this compound in the inventory signals that it has been evaluated for specific uses in food contact scenarios with defined limitations. Outside the United States, regulatory recognition varies and often centers on occupational safety and chemical handling standards rather than food additive regulations. Agencies such as the U.S. Environmental Protection Agency (EPA) and international chemical safety bodies classify and manage glycol ethers within broader chemical control frameworks, focusing on exposure limits and industrial hygiene. In many jurisdictions, ethylene glycol monobutyl ether is managed as a solvent with defined workplace exposure limits and hazard communication requirements, reflecting its role in industrial and cleaning applications. There is no harmonized global food additive number (such as an E-number) assigned to this compound, given its primary use outside direct food formulation. Instead, its regulatory status worldwide is characterized by compartmentalized recognition in food contact substance inventories and occupational safety standards that together define where and how it can be used safely in environments connected to food production, processing, and packaging.

Taste And Functional Properties

Ethylene glycol monobutyl ether does not contribute taste characteristics to food products, as it is not present as a flavoring agent. In its technical function as a washing or surface removal agent, the compound’s sensory profile is limited to the mild solvent-like odor inherent to glycol ethers, which is not a characteristic used in flavor formulation. The absence of taste contribution reflects its intended applications in technical processes rather than sensory enhancement. Functionally, this solvent demonstrates a balance of polar and non-polar interactions due to its glycol ether structure. This balance enables it to interact effectively with a broad range of compounds, including oils, greases, and various organic materials. Its complete miscibility with water and compatibility with many organic solvents allow formulations incorporating this agent to penetrate residues and facilitate their removal from surfaces. These properties make it suitable for use in cleaning systems where both hydrophilic and lipophilic residues must be addressed. Stability considerations in cleaning applications are important: ethylene glycol monobutyl ether exhibits stability under typical processing conditions encountered in industrial cleaning operations. It does not readily degrade under moderate temperatures or pH ranges encountered in wash solutions, allowing consistent performance over a range of uses. Its physical properties, such as boiling point and flash point, influence formulation design by dictating safe handling protocols and evaporation characteristics when incorporated in aqueous or solvent-based cleaning systems. Although not part of food organoleptic properties, understanding these functional characteristics supports its appropriate selection in applications tied to food production environments.

Acceptable Daily Intake Explained

Acceptable Daily Intake (ADI) is a concept used by regulatory bodies to describe the estimated amount of a substance that can be ingested daily over a lifetime without appreciable health risk. In the case of ethylene glycol monobutyl ether, there is no established ADI for direct dietary intake because it is not used as a direct food additive. Regulatory evaluations concentrate on its use in indirect food contact applications, where exposure to food itself is incidental and minimized by rinsing and sanitation practices. In contexts where ADI values are established for food additives, these figures are derived from toxicological data obtained in animal studies and then adjusted by safety factors to account for species differences and uncertainties. The resulting ADI is expressed in milligrams of the substance per kilogram of body weight per day and serves as a benchmark for dietary risk assessment. For ethylene glycol monobutyl ether, because it functions as a surface removal agent and not as a nutritional or flavor additive, regulators have not set an ADI. Instead, regulatory frameworks focus on conditions of use that limit potential exposure, and occupational safety standards address inhalation and dermal contact risks in industrial environments.

Comparison With Similar Additives

Ethylene glycol monobutyl ether shares functional similarities with other glycol ether solvents such as diethylene glycol monobutyl ether and propylene glycol ethers, which are also used as solvents and coupling agents in industrial and cleaning applications. These compounds are chosen for formulations where balance between hydrophilic and lipophilic interactions is needed to dissolve a wide range of residues. Compared to diethylene glycol monobutyl ether, ethylene glycol monobutyl ether generally exhibits lower molecular weight and slightly higher volatility, which can influence evaporation rates in cleaning solutions. In contrast to food-grade surfactants and emulsifiers used directly in food products, glycol ethers are selected for external technical functions. Food-grade emulsifiers such as lecithin or mono- and diglycerides contribute to texture, stability, and mouthfeel in foods and have established dietary intake guidelines. Glycol ethers do not play these roles and are evaluated under different regulatory frameworks that govern indirect contact or occupational exposures. Other solvent classes, such as alcohols (e.g., ethanol) and simple glycol derivatives (e.g., propylene glycol), may be used in both food processing and formulation with established safety profiles and specific allowable use levels. Ethylene glycol monobutyl ether, by contrast, occupies a niche role where its contribution to cleaning efficacy and surface removal is paramount, and its regulatory recognition reflects controlled use conditions rather than direct dietary contribution.

Common Food Applications Narrative

In the context of food-related environments, ethylene glycol monobutyl ether’s role is associated with supporting cleanliness and hygiene rather than direct incorporation into food products. Facilities that process food ingredients, package prepared goods, or handle raw produce require effective cleaning agents to maintain sanitary surfaces, conveyors, and processing equipment. Given its surface removal capability and solvency characteristics, ethylene glycol monobutyl ether may be found as part of formulated cleaning solutions used in industrial kitchens, bottling lines, and equipment sanitation systems. These cleaning systems are designed to remove fats, oils, sugars, and other residues that can accumulate on food contact surfaces during production cycles. Surfaces that are inadequately cleaned can harbor microbial growth or cross-contamination risks, which underscores the importance of choosing agents with suitable solvency and surface interaction profiles. In such applications, ethylene glycol monobutyl ether helps dissolve and mobilize stubborn residues, enabling their effective removal by mechanical action and rinsing. Because regulations govern how and where cleaning agents can be used in food production environments, products formulated with ethylene glycol monobutyl ether are labeled and applied according to specified protocols to minimize any potential for residual contamination. These protocols often involve thorough rinsing and verification of cleanliness before food contact resumes. In this way, the compound contributes indirectly to food safety by facilitating rigorous sanitation practices that underpin high standards of hygiene in food processing operations.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 173.315; 175.105; 176.210; 177.1650; 178.1010

EFSA

  • Notes: No EFSA food additive evaluation found

JECFA

  • Notes: JECFA evaluation for direct dietary intake not identified

Sources

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