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Chloride Aconitic acid

Aconitic acid has been prepared from citric acid by the action of sulfuric acid or hydrogen chloride, or by heating. It has been prepared also from methyl acetylcitrate and from acetylcitric anhydride. The method described is essentially that of Hentschel. Phosphoric acid (85 per cent) can be used in place of sulfuric acid, but much closer regulation of the conditions seems necessary and the yield is not greatly improved. [Pg.3]

Aconitic acid was the first organic acid properly established as a component of cane molasses.63 Louisiana molasses is a rich source and contains more than 6% of this acid in some cases.114 With a potential annual harvest of over 5,000,000 pounds of aconitic acid from Louisiana alone, it is nevertheless only recently that the commercial production of this acid from molasses has been initiated in Louisiana.116 Its isolation depends upon the insolubility and ready crystallizability of dicalcium magnesium (rans-aconitate hexahydrate.114118-118 Final, or an intermediate or B , molasses is diluted to 55% solids (55° Brix) with the appropriate wash water from the process (see below) and the pH is adjusted to 7 with lime. The solution is heated to 200°F. and calcium chloride is added. Heating is continued for forty-five minutes whereupon the precipitate is collected. It is resuspended at 195°F. in a volume of water sufficient to adjust the next lot of molasses to 55° Brix. The precipitate is again centrifuged it contains about 56% aconitic acid.116 Aconitic acid, either as such or after conversion to itaconic acid, is of present-day commercial interest.118"... [Pg.309]

Ventre and co-workers,72-78 in later work, found that the addition of calcium chloride greatly increased the amount of aconitates thus recovered. The procedure used was as follows lime was added to a quantity of sorghum juice to adjust the pH value to approximately 6.9. The amount of lime required for this treatment was calculated as equivalents of aconitic acid and this portion of the aconitic acid in the original sample of juice was assumed to be free aconitic acid. The remaining aconitic acid was assumed to be bound in the form of a soluble aconitate. An amount of calcium chloride equivalent to the bound aconitate was then added to the juice for the precipitation. The insoluble aconitates which precipitated during the subsequent evaporation of the juices were removed by some appropriate means at a later point in the sugar recovery system. [Pg.240]

Ambler and Roberts,81-89 in subsequent work, found that if the calcium magnesium salts were heated to remove a portion of the water of hydration the magnesium content could be replaced by calcium by treating the dried salts with a hot concentrated calcium chloride solution. Thus the aconitates could be converted into tricalcium aconitate and subsequent treatment of this salt with sulfuric acid enabled the removal of the cations as insoluble calcium sulfate. The crystallization of aconitic acid from such a filtrate was therefore not complicated by the necessity of a fractional crystallization to separate the aconitic acid and the magnesium sulfate formerly obtained. [Pg.244]

Hydrochloric acid has also been used for the acidification.90 In this case the aconitic acid is then crystallized from the solution of aconitic acid and alkaline earth chlorides. [Pg.244]

As a result of the cis-trans isomerization two isomeric aconitic anhydrides are known. Treatment of the irans-aconitic acid with acetyl chloride,46,96>96 or with acetic anhydride,96 97 leads to the formation of both the cfs-aconitic anhydride (II) and the irans-aconitic anhydride (III). More recently it has been reported that good yields of the cfs-anhydride... [Pg.245]

Aconitic acid Allyl alcohol Benzyl chloride Butoxyethanol Decyl alcohol Dimethylolpropionic acid 2-Dodecen-1-ylsuccinic anhydride Ethoxydiglycol Ethylene Ethylene chlorohydrin Hydroquinone monomethyl ether Maleic acid Phosphorus oxychloride o-Xylene 2,3-Xylenol... [Pg.5535]

Itaconic Acid i-to-lka-nik- n [ISV, anagram of aconitic acid, C3H3(COOH)3, fr. aconite] (ca. 1872) (methylenesuccinic acid HOOCC (=CH2)CH2COOH. A white crystalline powder usually obtained by the oxidative fermentation of sucrose or glucose with Aspergillyus terreus. It is capable of polymerization alone, or as a comonomer with acrylic acid, acrylonitrile, styrene, methyl methacrylate, and vinylidene chloride. It is used as an additive in acrylic resins to increase their adhesion to cellulose. By polycondensation of itaconic acid with diols, polyesters are obtained that contain methylene side groups. Merck Index, 13 Ed.,... [Pg.404]

Calcium Chloride 12 75-85 24-29 6 - - - plus 8 percent methyl ethyl ketone. 1 percent HCI. 0.5 percent aconitic acid... [Pg.675]

Figure 14.4 Separation of organic acids (as anions) and inorganic anions in wine (reproduced with permission of Dionex). Conditions column, 25cm x 4mm i.d. and precolumn stationary phase, lonPac AS11-HC mobile phase, 1.5 ml min nonlinear gradient from 1 mM to 60mM NaOH and from 0 to 20% methanol temperature, 30°C conductivity detector after packed suppressor. Peaks 1 = lactate 2 = acetate 3 = formate 4 = pyruvate 5 = galacturonate 6 = chloride 7 = nitrate 8 = succinate 9 = malate 10 —tartrate 11—fumarate 12 —sulfate 13 = oxalate 14 = phosphate 15 —citrate 16 = isocitrate 17 = c/s-aconitate 18 = frans-aconitate. Figure 14.4 Separation of organic acids (as anions) and inorganic anions in wine (reproduced with permission of Dionex). Conditions column, 25cm x 4mm i.d. and precolumn stationary phase, lonPac AS11-HC mobile phase, 1.5 ml min nonlinear gradient from 1 mM to 60mM NaOH and from 0 to 20% methanol temperature, 30°C conductivity detector after packed suppressor. Peaks 1 = lactate 2 = acetate 3 = formate 4 = pyruvate 5 = galacturonate 6 = chloride 7 = nitrate 8 = succinate 9 = malate 10 —tartrate 11—fumarate 12 —sulfate 13 = oxalate 14 = phosphate 15 —citrate 16 = isocitrate 17 = c/s-aconitate 18 = frans-aconitate.
Fig. 7.2 Chromatogram of acidic metabolites extracted from the urine of a normal child using DEAE-Sephadex and re-extraction with solvents after ethoxime formation and freeze-drying by reconstitution in water, acidification with hydrochloric acid, saturation with sodium chloride, and solvent extraction with diethyl ether (three times) and ethyl acetate (three times), evaporation of the solvents from the combined extracts using dry nitrogen and trimethylsilylation using the minimum quantity of BSTFA. Separated on 10 per cent OV-101 on HP Chromosorb W (80-100 mesh) by temperature programming from 110°C to 285°C at 4°C min with an initial 5 min isothermal delay. Peak identifications are 1, phenol plus lactate 2, glycollate 3, cresol 4, 3-hydroxyisovalerate 5, benzoate 6, phosphate 7, succinate 8, 3-methyladipate 9, 3-hydroxy-3-methyl-glutarate 10, 4-hydroxyphenylacetate 11, homovanillate plus some aconitate 12, hippurate 13, citrate 14, vanilmandelate 15, n-tetracosane (standard) 16, n-hexacosane (standard). Fig. 7.2 Chromatogram of acidic metabolites extracted from the urine of a normal child using DEAE-Sephadex and re-extraction with solvents after ethoxime formation and freeze-drying by reconstitution in water, acidification with hydrochloric acid, saturation with sodium chloride, and solvent extraction with diethyl ether (three times) and ethyl acetate (three times), evaporation of the solvents from the combined extracts using dry nitrogen and trimethylsilylation using the minimum quantity of BSTFA. Separated on 10 per cent OV-101 on HP Chromosorb W (80-100 mesh) by temperature programming from 110°C to 285°C at 4°C min with an initial 5 min isothermal delay. Peak identifications are 1, phenol plus lactate 2, glycollate 3, cresol 4, 3-hydroxyisovalerate 5, benzoate 6, phosphate 7, succinate 8, 3-methyladipate 9, 3-hydroxy-3-methyl-glutarate 10, 4-hydroxyphenylacetate 11, homovanillate plus some aconitate 12, hippurate 13, citrate 14, vanilmandelate 15, n-tetracosane (standard) 16, n-hexacosane (standard).

See other pages where Chloride Aconitic acid is mentioned: [Pg.203]    [Pg.240]    [Pg.241]    [Pg.241]    [Pg.249]    [Pg.560]    [Pg.561]    [Pg.54]    [Pg.634]    [Pg.635]    [Pg.636]    [Pg.914]    [Pg.946]    [Pg.950]    [Pg.951]    [Pg.1235]    [Pg.17]    [Pg.30]    [Pg.53]    [Pg.238]    [Pg.243]    [Pg.180]    [Pg.360]    [Pg.226]   
See also in sourсe #XX -- [ Pg.196 ]




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