POLY(MALEIC ANHYDRIDE), SODIUM SALT

CAS: 70247-90-4 BOILER WATER ADDITIVE

POLY(MALEIC ANHYDRIDE), SODIUM SALT is a polymeric substance used in food processing applications to control mineral scale in sugar processing and as a boiler water additive under specific regulatory conditions.

What It Is

POLY(MALEIC ANHYDRIDE), SODIUM SALT is a synthetic polymeric additive identified by the Chemical Abstract Service number 70247-90-4. It is also known by the alternative chemical name 2,5-FURANDIONE, HOMOPOLYMER, SODIUM SALT, reflecting its structural derivation from maleic anhydride monomers. This compound exists as a sodium salt of the polymeric maleic anhydride and is used in controlled food processing applications rather than as a direct food constituent. As a polymer substance, it is characterized by multiple repeat units joined together and carries sodium counterions that enhance its solubility in aqueous media. The compound’s classification as a boiler water additive in the context of food processing refers to its role in steam generation systems that contact food products indirectly under regulated conditions. Its use is governed by federal regulations that allow it to serve specific technical purposes in food manufacturing processes.

How It Is Made

The manufacture of POLY(MALEIC ANHYDRIDE), SODIUM SALT typically begins with the polymerization of maleic anhydride monomers. Maleic anhydride itself is derived industrially from the oxidation of benzene or butane precursors under controlled conditions, resulting in a cyclic anhydride functional group that is susceptible to ring-opening and polymerization reactions. In the polymerization process, maleic anhydride molecules link together to form long chains of alternating repeat units, and sodium ions are introduced to stabilize the ionic form of the polymer, yielding the sodium salt variant. The resulting polymer may have a range of molecular weights depending on the specific process conditions and catalysts used. Manufacturers ensure that the product meets defined quality parameters for intended industrial use, including its function as a water treatment agent in food processing environments. Because this compound is used mainly for functional purposes rather than nutritional contribution, production facilities follow chemical industry practices for polymer synthesis and purification.

Why It Is Used In Food

POLY(MALEIC ANHYDRIDE), SODIUM SALT is used in certain food processing operations because it helps to control mineral scale and related deposits in systems where water is heated or evaporated. Mineral scale forms when water with dissolved minerals is subjected to heat, leading to the precipitation of calcium, magnesium, and other mineral salts that can impede heat transfer and clog equipment. By acting as a boiler water additive, it minimizes scale formation in boiler feedwater and steam systems that come into indirect contact with food products. This improves operational efficiency, extends equipment longevity, and helps maintain consistent processing conditions. The regulatory references 21 CFR 173.310 and 21 CFR 173.45 specifically describe the conditions under which this compound may be incorporated into food processing environments, recognizing its technical role without contributing to the finished food.

Adi Example Calculation

Because POLY(MALEIC ANHYDRIDE), SODIUM SALT does not have a defined Acceptable Daily Intake (ADI) established by international bodies like JECFA or EFSA, an illustrative calculation of ADI is not applicable in this context. Instead, regulatory controls focus on limiting the concentration of the compound in boiler feedwater or process streams to ensure that any potential indirect exposure remains well below levels of concern.

Safety And Health Research

Regulatory evaluations of POLY(MALEIC ANHYDRIDE), SODIUM SALT focus on its physical and chemical properties, its technical role in processing environments, and potential indirect exposures through steam contact. Safety assessments by regulatory authorities consider whether residues in food or food contact steam could pose any hazard to consumers. The conditions outlined in federal regulations include limits on concentration and molecular weight distribution to ensure that the additive remains within defined bounds when employed. Toxicological data specific to this polymeric substance may be limited due to its specialized use, and assessments rely on its chemical behavior, the conditions of use, and any available studies on related polymer salts. Because it is not directly ingested as a food ingredient, safety research is contextualized within its function as a processing aid rather than as a dietary additive.

Regulatory Status Worldwide

In the United States, POLY(MALEIC ANHYDRIDE), SODIUM SALT is recognized under 21 CFR 173.45 and 21 CFR 173.310 as an allowable additive for specific technical purposes. Section 173.45 addresses "Polymaleic acid and its sodium salt" and outlines molecular weight criteria and conditions for safe use in food processing, including limitations on its incorporation relative to process streams. Section 173.310 covers "Boiler water additives," which include this sodium salt as a scale control agent in boiler feedwater used to generate steam that may contact food. These federal regulations establish defined conditions, usage limitations, and analytical parameters necessary to ensure additive safety when used as intended. Regulations in other jurisdictions may vary and require individual reference to specific food additive lists or processing aid regulations in those regions. Because this compound is used for processing and not as a direct food constituent, its regulation reflects its technical role rather than dietary exposure limits.

Taste And Functional Properties

From a sensory perspective, POLY(MALEIC ANHYDRIDE), SODIUM SALT does not contribute flavor or aroma to food products because it is not intended to be present in the final food consumed by individuals. Its functional properties relate to its solubility in water and its interaction with mineral ions. When dissolved, it can complex with dissolved calcium and magnesium, preventing them from forming hard precipitates as water is heated. The effectiveness of such polymers in scale control can vary depending on pH, temperature, and the specific mineral composition of the water. Because of its chemical nature as a polymer salt, it remains effective at relatively low concentrations, and regulatory usage limits are established to ensure that any indirect exposure via steam contact remains within safe bounds.

Acceptable Daily Intake Explained

An Acceptable Daily Intake (ADI) is a concept used in food safety to describe the amount of a substance that can be consumed daily over a lifetime without appreciable health risk. For POLY(MALEIC ANHYDRIDE), SODIUM SALT, an official ADI has not been established in the context of traditional food additives because the compound is permitted only as a processing aid with regulated usage conditions rather than as a direct food ingredient. Regulatory frameworks such as those in the U.S. focus on safe processing conditions, concentration limits in process streams, and indirect contact rather than establishing an ADI. Consequently, when discussing ADI for this compound, it is important to note that its safety considerations are addressed through regulatory usage limits and technical criteria that ensure any indirect exposure via steam contact is minimal.

Comparison With Similar Additives

POLY(MALEIC ANHYDRIDE), SODIUM SALT is one of several polymeric or organic scale control agents used in industrial food processing to manage mineral deposits. Others in the same regulatory context include polymaleic acid and its derivatives or copolymers of acrylic acid used for similar purposes. Compared with simple inorganic phosphates or chelating agents, polymeric scale inhibitors often provide improved performance at lower concentrations due to their ability to interact with multiple mineral ions along the polymer chain. Each type of scale control agent has specific conditions under which it performs best, influenced by water chemistry, processing temperatures, and equipment design.

Common Food Applications Narrative

In industrial food processing, POLY(MALEIC ANHYDRIDE), SODIUM SALT finds its application primarily in operations where heated water and steam are integral to manufacturing. For example, in sugar processing facilities that handle beet or cane juice evaporation, boilers generate steam that drives evaporators, dryers, and other equipment. The purity of the steam and the efficiency of heat transfer are critical to product quality and throughput. Without adequate control of mineral scale, boilers and heat exchangers can develop deposits that reduce heating efficiency, increase energy usage, and necessitate frequent maintenance. In these environments, adding a boiler water additive like this sodium salt helps to maintain cleaner heating surfaces and reduce downtime. While the compound itself does not become a part of the final consumer food product, its presence in processing aids ensures the reliability of the food production line. This type of functional use is an example of how regulated additives support the manufacturing process without directly influencing the sensory properties of foods.

Safety & Regulations

FDA

  • Approved: True
  • Regulation: 21 CFR 173.45 and 21 CFR 173.310

EFSA

  • Notes: No specific EFSA evaluation found for this compound

JECFA

  • Notes: No JECFA evaluation entry found for this specific CAS

Sources

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