Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C67/00—Preparation of carboxylic acid esters
  • C07C67/48—Separation; Purification; Stabilisation; Use of additives
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11C—FATTY ACIDS FROM FATS, OILS OR WAXES; CANDLES; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS, OILS, OR FATTY ACIDS OBTAINED THEREFROM
  • C11C1/00—Preparation of fatty acids from fats, fatty oils, or waxes; Refining the fatty acids
  • C11C1/08—Refining
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
  • C07C51/41—Preparation of salts of carboxylic acids
  • C07C51/412—Preparation of salts of carboxylic acids by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
  • C07C51/42—Separation; Purification; Stabilisation; Use of additives
  • C07C51/487—Separation; Purification; Stabilisation; Use of additives by treatment giving rise to chemical modification
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B3/00—Refining fats or fatty oils
  • C11B3/001—Refining fats or fatty oils by a combination of two or more of the means hereafter
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B3/00—Refining fats or fatty oils
  • C11B3/02—Refining fats or fatty oils by chemical reaction
  • C11B3/06—Refining fats or fatty oils by chemical reaction with bases
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11B—PRODUCING, e.g. BY PRESSING RAW MATERIALS OR BY EXTRACTION FROM WASTE MATERIALS, REFINING OR PRESERVING FATS, FATTY SUBSTANCES, e.g. LANOLIN, FATTY OILS OR WAXES; ESSENTIAL OILS; PERFUMES
  • C11B7/00—Separation of mixtures of fats or fatty oils into their constituents, e.g. saturated oils from unsaturated oils
  • C11B7/0083—Separation of mixtures of fats or fatty oils into their constituents, e.g. saturated oils from unsaturated oils with addition of auxiliary substances, e.g. cristallisation promotors, filter aids, melting point depressors

Definitions

• 3-chloro-1,2-propanediol (3-MCPD) is a well known organic chemical compound formed in foods. It is a byproduct of food processing, especially in heat processed, fat-containing foodstuff, where 3-MCPD is formed during the processing.
• 3-MCPD esters in refined fats and oils, including edible oils.
• 3-chloro-1,2-propanediol (3-MCPDs) and their esters have been found in all refined vegetable oils.
• organohalo species for example, 3-chloro-1,2-propanediol (MCPDs)
• MCPDs 3-chloro-1,2-propanediol
• Free MCPD has been found to exhibit genotoxic and carcinogenic effects in testing, and these effects have raised some concern, especially in the food industry.
• Glycidol is also a known genotoxic and carcinogenic compound.
• the present technology provides one or more unique processes of providing fatty acid glyceride streams and triglyceride oils free of organohalo (e.g., 3-chloro-1,2-propandiol), glycidyl or other oxirane species, such as epichlorohydrin, and their respective esters.
• the processes include both treating oils and/or treating the processing stream used in the making and/or processing of crude or refined oils by the addition of one or more bases.
• the process includes adding one or more bases to either 1) a triglyceride oil, or 2) to a carboxylic acid ester stream used in the preparation of triglyceride oil.
• the one or more bases react with a fatty acid or a fatty acid ester within the carboxylic acid stream or triglyceride oil to form a carboxylate anion (soap) and a cation counterion.
• additional fatty acid is added with the one or more bases to form the carboxylate anion.
• the carboxylate anion then reacts with the organohalo or oxirane species to yield an ester and metal halide salt or a metal alkoxide species, respectively.
• fatty acid glyceride stream or triglyceride oil with reduced levels of organohalo (e.g., 3-chloro-1,2-propandiol), glycidyl esters or other oxirane species.
• organohalo e.g., 3-chloro-1,2-propandiol
• glycidyl esters or other oxirane species e.g., 3-chloro-1,2-propandiol
• the fatty acid glyceride stream or triglyceride oil is essentially free of organohalo, glycidyl esters or other oxirane species.
• the present technology provides at least one process of preparing a carboxylic acid ester stream with reduced levels or essentially free of organohalo, glycidyl or other oxirane species.
• the process comprises adding to the carboxylic acid ester stream an effective amount of a carboxylate anion and a cation counterion to react with the organohalo, glycidyl and oxirane species present in the carboxylic acid ester stream at a temperature of about 80° C. to about 275° C., preferably about 80° C. to about 250° C., more preferably about 140° C. to about 250° C., for a sufficient time to provide a carboxylic acid ester stream with reduced levels or essentially free of organohalo, glycidyl or other oxirane species.
• the present technology prevents the formation of organohalo, glycidyl or other oxirane species in a carboxylic acid ester stream or triglyceride oil.
• the present technology provides at least one process of removing organohalo, glycidyl or other oxirane species from a triglyceride oil comprising the steps of mixing an effective amount of one or more bases to an effective amount of at least one fatty acid to produce an effective amount of a carboxylate anion and corresponding cation counterion that is sufficient to reduce or remove the organohalo, glycidyl or other oxirane species from the triglyceride oil; mixing the effective amount of the carboxylate anion with the triglyceride oil at a temperature of about 80° C. to about 275° C., preferably about 80° C. to about 250° C., more preferably about 140° C. to about 250° C., for a sufficient time; wherein the oil has reduced levels or essentially free of organohalo, glycidyl or other oxirane species.
• the present technology provides a process of reducing, removing, or preventing the formation of organohalo, glycidyl or other oxirane species during processing or a manufacturing procedure for a triglyceride oil comprising the steps of making a triglyceride oil feedstock; adding a sufficient amount of one or more bases to react with a fatty acid within the triglyceride oil feedstock to produce a sufficient amount of a carboxylate anion and a cation counterion to react with the organohalo, glycidyl and other oxirane species present in the feedstock; incubating the feedstock and one or more bases at a temperature of about 80° C.
• the one or more bases are added at the start of the oil processing or manufacturing procedure.
• the process further comprises adding a sufficient amount of a fatty acid to react with the one or more bases to produce the carboxylate anion and cation counterion.
• the triglyceride oil or carboxylic acid ester stream comprises less than about 0.5 ppm of organohalo, glycidyl or other oxirane species, preferably less than about 0.15 ppm, alternatively less than about 0.1 ppm.
• the present technology surprisingly provides a method of removing, reducing, eliminating or preventing the formation of organohalo species, glycidyl, or other oxiranes, such as for example, epichlorohydrin, or their respective esters from carboxylic acid esters streams and crude and refined triglyceride oils.
• the methods provide resultant carboxylic acid ester streams or triglyceride oils that are reduced or, in some embodiments, essentially free of organohalo, glycidyl or other oxirane species.
• reduced organohalo, glycidyl or other oxirane species in relation to the present technology is defined as a reduction by at least 25% or more, preferably at least 40% in the amount of the organohalo, glycidyl or other oxirane species in the carboxylic acid ester streams or crude and refined triglyceride oil when compared to the carboxylic acid ester stream or triglyceride oil not treated with a base as in the present technology.
• the amount of the organohalo, glycidyl, or other oxirane species are reduced by at least about 25% or more, at least about 30% or more, alternatively about 35% or more, alternatively about 40% or more, alternatively about 45% or more, alternatively about 50% or more, alternatively about 55% or more, alternatively about 60% or more, alternatively about 70% or more, alternatively about 80% or more, alternatively about 90% or more, and include any percentages there between, including, but not limited to, increments of about 0.1%, about 0.2%, about 0.25%, about 0.3%, about 0.4%, about 0.5%, about 0.6%, about 0.7%, about 0.8%, about 0.9%, about 1% and multiple factors thereof (e.g. about 0.5 ⁇ , about 1 ⁇ , about 2.0 ⁇ , about 2.5 ⁇ , etc).
• organohalo, glycidyl or other oxirane species for the present technology is defined as levels of the organohalo, glycidyl or other oxirane species which are very low levels, for example, less than about 0.5 ppm, more preferably less than about 0.15 ppm, alternatively less than about 0.1 ppm of the compositions of the oil. In some embodiments, “essentially free of” would encompass undetectable levels of these compounds.
• the amount of organohalo, glycidyl or other oxirane species within the oil can be calculated or estimated by any means known in the art, including gas chromatography (GC) mass spectrometry, liquid chromatography (LC) mass spectrometry and the like. Commercial laboratories that can perform these measurements include, but are not limited to, Eurofins Central Analytical Laboratories, Metairie, La. and SGS Gmbh, Hamburg, Germany.
• the present technology provides a process for treating both refined and unrefined oil and/or treating the processing carboxylic acid ester stream in the making or processing of refined oils to reduce, remove or prevent the formation of the organohalo, glycidyl or other oxirane species from the end-product oil.
• a process for treating both refined and unrefined oil and/or treating the processing carboxylic acid ester stream in the making or processing of refined oils to reduce, remove or prevent the formation of the organohalo, glycidyl or other oxirane species from the end-product oil.
• the present technology provides a process of treating a carboxylic acid ester stream in the process of making an oil to prevent the formation of organohalo, glycidyl or oxirane species.
• the present technology provides a process for producing carboxylic acid ester streams with reduced levels or essentially free of organohalo species (e.g., 3-chloro-1,2-propandiol), glycidol or oxirane species and their respective esters.
• the process involves chemically modifying the organohalo, glycidyl or oxirane species from the oil so that it can be separated out from the carboxylic acid ester stream, in some instances by filtration.
• the process includes adding at least one base either during the processing and/or manufacture of a carboxylic acid ester stream or after the carboxylic acid ester stream is produced into a triglyceride oil.
• the at least one base reacts with a fatty acid or a fatty acid ester within the carboxylate acid stream to form a carboxylate anion (soap) and its cation counterion as depicted below:
• R represents a carbon chain length from C 1 to C 23 and wherein M is an alkali metal, an alkaline earth metal, a transition metal, or a nitrogen- or phosphorous-containing cationic species.
• M is an alkali metal, an alkaline earth metal, a transition metal, or a nitrogen- or phosphorous-containing cationic species.
• the carboxylate anion and cation counterion reacts with the organohalo or glycidyl species to yield an ester and metal halide salt or a metal alkoxide species, respectively as shown below:
• R represents a carbon chain length from C 2 to C 24 and wherein M is an alkali metal, an alkaline earth metal, a transition metal, or a nitrogen- or phosphorous-containing cationic species.
• the metal halide salt formed can be filtered out from the refined or processed carboxylic acid stream, providing a filtered carboxylic acid ester stream with reduced levels or essentially free of organohalo (e.g., 3-chloro-1,2-propandiol), glycidol or oxirane species and their respective esters.
• carboxylic acid ester streams include, but are not limited to, any compound or components within the stream of manufacturing, refining, processing or purifying fats and oils, including, but not limited to, fats, oils, fatty acids and glycerols and the like.
• fatty acid and carboxylic acids are interchangeable for use in the present application.
• Fats and oils include, but are not limited to, any triglyceride oils, including raw and purified oils, vegetable oils, animal fat, and synthetic oils. Fats and oils are composed of triglycerides, esters of glycerol and fatty acids.
• Natural fats and oils are composed principally of triglycerides, but other components may be present in minor quantities, including, but not limited to, fatty acids, partial glycerides, diglycerides and monoglycerides.
• Triglycerides are also called triacylglycerols (TAG) and are esters derived from glycerol and three fatty acids.
• Suitable triglyceride oils include, but are not limited to coconut oil, cochin oil, corn oil, cottonseed oil, linseed oil, olive oil, palm oil, palm kernel oil, peanut oil, soybean oil, sunflower oil, tall oils, tallow, lesquerella oil, tung oil, whale oil, tea seed oil, sesame seed oil, safflower oil, rapeseed oil, fish oils, avocado oil, mustard oil, rice bran oil, almond oil, walnut oil, derivatives thereof, and combinations thereof.
• the processes of manufacturing, refining, processing or purifying fats and oils include any process known to one skilled in the art. These processes include, but are not limited to, physical, steam or mechanical refining (including, but not limited to, for example, vacuum steam distillation), chemical refining (including, but not limited to, for example, solvent extraction and miscella refining), and treatment by bleaching clay, basic or acidic resin, silica, alumina and/or active carbon.
• organohalo, glycidyl or other oxirane species are removed by the addition of at least one base during the processing steps of the triglyceride oil or carboxylic acid ester stream.
• the at least one base may be added at the beginning of the processing or manufacturing step, during the processing and manufacturing steps, or after the processing or manufacturing steps of a triglyceride oil. If added during the processing or after the processing of the triglyceride oils, additional fatty acids may also be added to produce sufficient amounts of the carboxylate anion and counter cation, or alternatively already formed carboxylate anion and counter cation may be added.
• the at least one base is added in an amount sufficient to remove a sufficient amount of the organohalo, glycidyl or other oxirane species from the triglyceride oil or carboxylic acid stream.
• a sufficient amount of the at least one base includes an amount able to react with a sufficient amount of fatty acid to produce a sufficient amount of carboxylate anion and cation counterion to react with organohalo, glycidyl or other oxirane species present or formed during the processing or manufacturing to reduce the amount of organohalo, glycidyl or oxirane species or, in some embodiments, produce an oil that is substantially free of organohalo, glycidyl or oxirane species.
• the at least one base can be added at the beginning or during the processing or manufacturing of the triglyceride oil, the at least one base can be added in excess of the amount of organohalo, glycidyl or other oxirane species anticipated to be formed in the final end-product triglyceride oil.
• the anticipated amount of organohalo, glycidyl or other oxirane species can be estimated by one skilled in the art familiar with manufacturing and processing techniques, and can also be determined by measuring the amount of organohalo, glycidyl or oxirane species in the untreated oil.
• the amount of based added during processing or manufacturing of the oil is about 100 parts per million (ppm) to about 2% based on total weight of the triglyceride oil, preferably about 200 ppm to about 2% based on total weight of the triglyceride oil.
• the base can be added in an excess of the organohalo, glycidyl or other oxirane species present or anticipated to be formed, preferably about 1.1 fold to about 10,000 fold excess, preferably about 1.1 fold to about 20 fold excess, preferably about 2 fold to about 10 fold excess.
• the base can be added in excess of the organohalo, glycidyl or oxirane species present or anticipated in about 1.1 fold to about 1,000 fold excess, alternatively from about 1.1 fold to about 500 fold excess, alternatively from about 1.1 fold to about 250 fold excess, alternatively from about 1.1 fold to about 100 fold excess, alternatively from about 1.1 fold to about 50 fold excess, alternatively from about 1.1 fold to about 25 fold excess, alternatively from about 1.1 fold to about 20 fold excess, alternatively from about 2 fold to about 1000 fold excess, alternatively from about 2 fold to about 500 fold excess, alternatively from about 2 fold to about 250 fold access, alternatively from about 2 fold to about 100 fold excess, alternatively from about 2 fold to about 50 fold excess, alternatively from about 2 fold to about 25 fold excess, and includes any percentage or range there between, including, but not limited to, increments of about 0.1, about 0.2, about 0.3, about 0.4, about 0.5, about 0.6, about 0.7, about 0.8, about 0.9 or about 1.0 fold and multiplie
• the fold excess can be about 2 fold, about 3 fold, about 4 fold, about 5 fold, about 6 fold, about 7 fold, about 8 fold, about 9 fold, about 10 fold, about 11 fold, about 12 fold, about 13 fold, about 14 fold, about 15 fold, about 16 fold, about 17 fold, about 18 fold, about 19 fold, about 20 fold, about 21 fold, about 22 fold, about 23 fold, about 24 fold, about 25 fold, about 30 fold, about 35 fold, about 40 fold, about 45 fold, about 50 fold, about 55 fold, about 60 fold, about 65 fold, about 70 fold, about 75 fold, about 80 fold, about 85 fold, about 90 fold, about 95 fold, about 100 fold, about 105 fold, about 110 fold, about 115 fold, about 120 fold, about 125 fold, about 130 fold, about 135 fold, about 140 fold, about 145 fold, about
• the one or more bases is added in a sufficient amount to produce at least about 350 ppm or more of the carboxylate anion (soap) or cation counterion within the carboxylic acid ester stream or triglyceride oil, preferably at least about 400 ppm or more, to react with the organohalo, glycidyl or other oxirane species.
• a sufficient amount of the carboxylate anion or cation counterion may be directly added to the carboxylic acid ester stream or the unrefined or refined triglyceride oil, wherein the sufficient amount is at least about 350 ppm or more, more preferably about 400 ppm or more.
• the amount of the carboxylate anion formed or added includes, but is not limited to, about 350 ppm or more, about 400 ppm or more, about 450 ppm or more, about 500 ppm or more, about 550 ppm or more, about 600 ppm or more, about 650 ppm or more, about 700 ppm or more, about 800 ppm or more, about 900 ppm or more, about 1000 ppm or more, about 1200 ppm or more, about 1500 ppm or more, about 1800 ppm or more, about 2000 ppm or more, about 2500 ppm or more, and includes any ppm amount there between, including, but not limited to, for example, increments of about 0.1 ppm, about 0.25 ppm, about 0.5 ppm, about 1 ppm, about 2 ppm, about 5 ppm, about 10 ppm, about 20 ppm, about 25 ppm, about 50 ppm, about 100 ppm, and multiple factors thereof
• the at least one base can be added during any step of the processing and/or manufacturing of the triglyceride oil, including, but not limited to, refining, degumming, deodorizing, washing, bleaching, distillation, refining, and the like and any combination thereof.
• free fatty acid can also be added in an amount sufficient to react with the one or more bases to produce a sufficient amount of carboxylate anion to reduce or remove the organohalo, glycidyl or other oxirane species from the end-product oil and provide an oil with reduced levels or essentially free of organohalo, glycidyl or other oxirane species.
• a fatty acid naturally found in the oil being manufactured or processed is used.
• the reaction of the carboxylate anion (and cation counterion) with the organohalo, glycidyl or other oxirane species occurs at a temperature of about 80° C. to about 275° C., alternatively about 80° C. to about 250° C., preferably about 120° C. to about 275° C., preferably about 140° C. to about 240° C., more preferably about 180° C. to about 230° C., and includes any ranges or temperatures there between, including increments of about 0.1, about 0.2, about 0.3, about 0.4, about 0.5, about 0.6, about 0.7, about 0.8, about 0.9, about 1.0 and multiple factors thereof (e.g.
• Suitable temperatures include, but are not limited to, about 80° C., about 90° C., about 100° C., about 110° C., about 120° C., about 130° C., about 140° C., about 150° C., about 160° C., about 170° C., about 180° C., about 190° C., about 200° C., about 210° C., about 220° C., about 230° C., about 240° C., about 250° C., about 260° C., about 270° C., about 275° C. and includes any temperature there between in increments of about 0.1, about 0.2, about 0.25, about 0.3, about 0.4, about 0.5, about 0.6, about 0.7, about 0.8, about 0.9, about 1.0 and multiple factors thereof.
• reaction times include, but are not limited to, about 30 minutes or more, preferably about one hour or more, and include, but are not limited to, for example, about 30 minutes or more, about 45 minutes or more, about 50 minutes or more, about one hour or more, about two hours or more, about three hours or more, about four hours or more, about 5 hours or more, about 6 hours or more, about 7 hours or more and includes any amounts of time there between.
• Reaction times will depend on both the amount of the carboxylate anion and cation counter ion present in the reaction mixture and the reaction temperature.
• reaction time will be longer when a temperature at the lower end of the temperature range is used, and shorter when a temperature at the high end of the temperature range is used.
• reaction times will be longer when amounts of carboxylate anion and cation counterion present in the reaction stream are at the lower end of the range, for example at about 350 ppm to about 400 ppm, and will be shorter when amounts greater than about 400 ppm are present.
• the present technology includes a process of reducing or removing organohalo, glycidyl or other oxirane species from a triglyceride oil comprising the steps of mixing an effective amount of the one or more bases with an effective amount of at least one fatty acid to produce an effective amount of a carboxylate anion and corresponding cation counter ion that is sufficient to reduce or remove the organohalo, glycidyl or other oxirane species from the triglyceride oil; and mixing the effective amount of the carboxylate anion with triglyceride oil at a temperature of about 80° C. to about 275° C., alternatively about 80° C. to about 250° C., preferably 140° C.
• the reacted mixture is then filtered by methods known in the art, for example, but not limited to, filter press or bag filter, to remove the halide salt species formed.
• the filtered oil has reduced levels or is essentially free of organohalo, glycidyl or other oxirane species.
• fatty acids found within the triglyceride oils can be used to react with the added base and/or bases to produce the carboxylate anion (and cation counter ion).
• additional fatty acid can be added to produce a sufficient amount of carboxylate anion (and cation counterion) to react with the organohalo, glycidyl or other oxirane species present or estimated in the triglyceride oil or carboxylic acid ester stream.
• the triglyceride oil is already processed, for example a refined or unrefined fatty acid oil.
• a sufficient amount of one or more bases is added (and if necessary, additional amount of at least one fatty acid) to produce a sufficient amount of carboxylate anion (and cation counterion) to react with the amount of organohalo, glycidyl or other oxirane species within the oil.
• the amount of organohalo, glycidyl or other oxirane species within the oil can be calculated or estimated by any means known in the art, including gas chromatography (GC) mass spectrometry, liquid chromatography (LC) mass spectrometry and the like.
• fatty acids In the case of refined oils, the fatty acids have been removed during the refining procedure and thus fatty acids are also added along with the one or more bases. In the case of non-refined oils some free fatty acids may be available to react with the one or more bases, and thus some or no extra fatty acids can be added with the one ore more bases, depending on the type of oil.
• At least one base is reacted with fatty acids (preferably a fatty acid which is natively found within the triglyceride) to create the carboxylate anion.
• the carboxylate anion is then reacted with the triglyceride oil to reduce or remove organohalo, glycidyl or other oxirane species.
• the carboxylate anion is added in a sufficient amount to reduce or remove a sufficient amount of the organohalo, glycidyl or other oxirane species to provide a triglyceride oil with reduced levels or essentially free of organohalo, glycidyl or other oxirane species.
• a sufficient amount of carboxylate anion is, as described above, at least about 350 ppm, alternatively at least about 400 ppm or more. This reaction is carried out as described above, at a temperature of about 80° C. to about 275° C., alternatively about 80° C. to about 250° C., preferably about 120° C. to about 275° C.
• a sufficient amount of time is, as described above, greater than about 30 minutes, alternatively an hour or more, alternatively two hours or more.
• the carboxylate anion can be reacted with the triglyceride oil in different ways.
• the carboxylate anion can be generated in or added to the reactor in which the triglyceride oil was formed (single pot method).
• the triglyceride oil can be added to a second reactor or a series of reactors, and the carboxylate anion can be added to the second reactor or the series of reactors (sequential method).
• triglyceride oil streams can flow over a reactor bed containing the carboxylate anion and cation counterion.
• Carboxylate anions and their cation counterion of the present technology include metal carboxylates of the following structure:
• R is C 2 to C 24 and M is an alkali metal, an alkaline earth metal, a transition metal, or a nitrogen- or phosphorous-containing cationic species.
• Any suitable alkali metal, alkaline earth metal or transition metal may be used, including, but not limited to, for example, iron, copper, calcium, magnesium, aluminum, potassium, sodium, and the like.
• the metals that can be used in edible oils are preferably those that are found naturally in the body, including, but not limited to, calcium, magnesium, copper, potassium, sodium, and the like.
• the metal can be chosen based on a number of factors, including, but not limited to, cost and final application. Suitable final applications include, but are not limited to, for example, edible foods, pet food, cosmetics, flavor carriers, pharmaceuticals and the like.
• oils or carboxylic acid ester streams of the present technology are filtered using standard filtering techniques known in the art.
• the oils are filtered using standard filtration equipment, including, but not limited to, for example, a bag filter, cartridge filter or plate and frame filter press.
• Typical filter pore sizes for these filters include pore sizes in the range of about 0.5 microns to about 100 microns.
• a filtering aid such as diatomaceous earth or kieselguhr could be used to improve the filtration process.
• Processes other than filtration can also be used to remove the resulting metal halide salt or metal alkoxide species from the oils or carboxylic acid ester streams.
• Such other processes that can be used include, but are not limited to, washing, centrifuging, winterization, extraction, acidification with a mineral acid, settling and miscella refining.
• Any suitable fatty acids may be used in the processing of making carboxylic acid ester streams, including, but not limited to, fatty acids derived from animal and vegetable sources, any feedstocks known in the art, including, but are not limited to, an alkyl ester of a carboxylic acid, carboxylic anhydride or carboxylic derivatives such as halides (acyl halides), carbonates, other carboxylate species, (e.g., mixed anhydrides) or heteroatom derivatives, such as, for example imidazolides, ortho esters, silyl esters, hydrazines.
• halides acyl halides
• carbonates e.g., mixed anhydrides
• heteroatom derivatives such as, for example imidazolides, ortho esters, silyl esters, hydrazines.
• any suitable base can be used that can react with the fatty acid to produce a carboxylate anion.
• Suitable bases include, but are not limited to, for example, carbonate, bicarbonate, hydroxide, oxide, alkoxide, amine bases, hydrides, phosphines and the like.
• the one ore more bases are added in excess of the amount of organohalo, glycidyl or other oxirane species in the carboxylic acid ester stream or triglyceride oil.
• the present technology provides a method of removing organohalo, glycidyl or other oxirane species from short and medium chain triglycerides (for example, short chain fatty acids have from 2-5 carbons and medium chain triglycerides have from 6-10 carbons) by deodorizing the triglyceride oil after addition of the carboxylate anion and cation counterion and described above.
• the process of deodorization includes the standard deodorization steps known in the art, for example, such steps can include heating the mixture for about 20 to about 30 minutes at a temperature of about 180° C. to about 200° C. under vacuum of about 2 mmHg to about 15 mmHg, and running steam through the mixture to remove impurities.
• deodorization steps can be used to remove some of the organohalo, glycidyl or other oxirane species from short and medium chain triglycerides
• deodorization alone without the addition of carboxylate anion and cation counterion, is not sufficient to substantially reduce the amount of these impurities present in the triglyceride oils.
• deodorization of heavier triglycerides such as C 12 chains and higher, can actually cause the formation of organohalo, glycidyl or other oxirane species in these heavier triglyceride oils.
• the present technology may be used for the reduction or removal of organohalo, glycidyl, or oxirane species from any triglyceride oils known in the art, including, but not limited to, edible and food grade oils and their analogs (monoglycerides and diglycerides), lubricating oils, synthetic oils, specialty polymers and personal care applications, and pharmaceuticals.
• Extra MCPD was added to a triglyceride reaction stream to determine if the base could remove the MCPD from the triglyceride oil.
• Glycerol 23.62 g, 0.256 mol
• capric/caprylic fatty acids 129.1 g, 0.822 mol
• preformed capric/caprylic fatty acid esters of 3-chloro-1,2-propanediol and C8/C10 fatty acids (3.05 g, 0.0078 mol) and potassium carbonate (base, 2.03 g, 0.0147 mol) were combined.
• the reaction was mixed and heated to about 210° C. over 11.5 hours. After holding at about 150° C. for 1 hour, the reaction solution was heated to about 210° C. over one hour and then held at about 210° C. for 3 hours.
• the solution was filtered using 50 micron filter paper. After the second hold period, no organochloro species were detected by GC.
• Example 1 illustrates that a base can be added during the manufacture of a triglyceride oil to effectively remove MCPD impurities from the resulting triglyceride oil.
• This example illustrates that the addition of a base to a triglyceride reaction stream is effective to remove MCPD impurities during manufacture of the triglyceride oil.
• Caprylate/capric fatty acids (52% caprylate, 640.45, 4.08 mol), glycerol, (108.7 g, 1.18 mol) and potassium carbonate (base) were combined. The mix was held for 20 minutes. After the offgassing has stopped, carbon (3.54 g) and 3-chloro-1,2-propanediol (2.79 g, 0.0244 mol) were added to the reaction mixture. The mix was heated to about 235° C. over 2 hours and held at about 235° C. for four additional hours.
• This example illustrates that a base (and additional fatty acids) can be added to a triglyceride oil product to effectively remove glycidyl ester impurities.
• a deodorized caprylate/capric triglyceride (99.95 g), C8/C10 fatty acids (3.3 g) and potassium carbonate (0.45 g) were combined and heated to about 200° C.
• glycidyl butyrate (1.54 g) was added.
• the mixture was incubated at about 200° C. for 1 hour, and the sample was filtered and analyzed for glycidyl content. No glycidyl species were detectable by gas chromatography.
• This example illustrates that the addition of a base to a triglyceride reaction stream is effective at triglyceride reaction temperatures to remove or prevent the formation of MCPD impurities during the manufacture of the triglyceride oil.
• C8/C10 fatty acids (647.69 g, 4.125 mol), sodium carbonate (2.00 g, 0.0189 mol) and carbon (3.48 g) were combined and heated to about 210° C.
• Glycerol 108.85 g, 1.182 mol
• the mix was heated to about 245° C. and held for 6 hours.
• the soap concentration was about 8,960 ppm.
• the carbon was removed via filtration.
• the total 3-MCPD (free and bound) was found to be less than 0.15 mg/kg as determined by GC mass spectrometry.
• Example 5 a run similar to Example 5 was conducted using similar reactants and similar reaction conditions, except that potassium carbonate was used as the base and the soap concentration was about 1,180 ppm. Upon analysis by an outside laboratory, the total 3-MCPD (free and bound) was found to be less than 0.15 mg/kg as determined by GC mass spectrometry.
• Example 5 a run similar to Example 5 was conducted using similar reactants and similar reaction conditions, except that the soap concentration was about 660 ppm. Upon analysis by an outside laboratory, the total 3-MCPD (free and bound) was found to be 0.23 mg/kg as measured by GC mass spectrometry. Untreated medium chain triglycerides (MCTs) from this manufacturing process typically have MCPD levels of greater than 0.5 ppm as measured by GC mass spectrometry.
• MCTs medium chain triglycerides
• Examples 8 and 9 illustrate the relationship between reaction time, reaction temperature, and soap concentration in removing the organochloro and oxirane species.
• the reaction temperature of Example 9 was lower than Example 8 (170° C. compared to 200° C.) and the soap concentration was slightly higher (3,970 ppm compared to 3,500 ppm), while the reaction times were the same.
• the conditions of time, temperature and soap concentration employed in Example 8 were sufficient to remove the MCPD impurities to below the detectable limits, whereas the conditions employed in Example 9 were sufficient to remove some of the MCPD impurities (about a 40% reduction).
• Example 9 It is expected that the MCPD concentration would have been below detectable limits (less than 0.10 mg/kg) in Example 9 if a higher concentration of soap had been used, keeping the reaction temperature and reaction time of Example 9 the same. Alternatively, a higher reaction temperature or longer reaction time, or both, could have been used in Example 9 to remove more of the MCPD impurities at the given soap concentration.

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