Stopper the flask and allow it to stand overnight in the refrigerator. a) Reference formulation: Sulfamate nickel formulation. The oleic acid (methyl oleate, oleyl alcohol) was then cut out of the funnel and the occluded acetone was recovered by distillation.Yields: Oleic acid 511 gr, methyl oleate 482 gr., oleyl alcohol 588 grConstants: Iodine value: oleic acid 88.8, methyl oleate 84.4, oleyl alcohol 89.6Purity: Oleic acid 92.8 %, methyl oleate 95.7%, oleyl alcohol 95%Notes: Yields: Oleic acid 420 gr, methyl oleate 412 gr, oleyl alcohol 450 gr.Constants: Oleic acid iodine value 90, methyl oleate iodine value 84.3, oleyl alcohol Iodine value 91.5.Purity: Oleic acid 94.8%, methyl oleate 96.8%, oleyl alcohol 97.7%. Propionic acid was obtained in 82.5% yield and acetic acid in 10.8% yield. The lead salt of sulfuric acid is insoluble in water, and sulfuric acid can=t be used as the base electrolyte for Sn/Pb plating solutions. Procedure:Fat acids are refluxed eight hours with 4 times their weight of methanol containing 1-2% of concentrated sulfuric acid (based on the weight of fat acids). The funnel is shaken, the layers allowed to separate, and the aqueous layer is withdrawn and extracted again with 200 ml of Skellysolve F.  The combined Skellysolve extracts are transferred to a 2 L separatory funnel and washed once with 500 ml of water twice with 100ml portions of dilute (4-5%) aqueous sodium carbonate and then 3 times with 10% aqueous methanol. Solutions need not be chilled below 15°-20° C. Crystallization is reasonably complete in several hours, but it is preferable to allow standing overnight. DE 19639174 A1 both disclose a solution for electroless coating of nickel. The electroplating experiments were performed in a 267 ml Hull Cell at RT with bright brass plated steel panels and moderate mechanical agitation. The mixture is then refluxed. These methods may be applied to glycerides, etc.Notes: Procedure:Linseed oil fatty acids (625 gr) (Notes 1, 2) were refluxed under nitrogen for 2 hours with an equal weight of potassium hydroxide dissolved in 2.5 liters of ethylene glycol. The yield was 380gr. of petroleum ether (bp 30°-60° C) and transfer the washings to a 2-liter separatory funnel  3  times, with 200 ml portions of distilled water or until the last wash is neutral to Congo red paper. The flask is immersed in an ice bath for 30 minutes. The distillate deposited a solid mass which was recrystallized from liquors. This was dissolved in 100ml  ether and two fractions were obtained by 1 - chilling to -30° C, mp 43.5-44.5 C; 2 - chilling to -40° C, 1 gr mp 43°-43.5° C. The fractions were combined and crystallized from 100 ml Shellysolve F at -10° C, yield 3.1 gr, mp 44°-45° C.Reference:Sol Radlove, Internal preparation notebook, 1732, p 11 NRRL. What and where are the starting materials? The residue did not exceed 5% of the charge.B. In this invention, dithionic acid and/or metal dithionates, such as the sodium, potassium, calcium, copper, zinc, nickel, tin, lead, ammonium and/or other metal dithionate salts, are added to electroless plating formulations as a means of improving the performance of these formualtions. See procedure for saponification and isolation of free fat acids. 0.5 TP) electrically heated and insulated with magnesia pipe covering. Another embodiment is an electroless or immersion plating composition, other than one for nickel or palladium, which contains dissolved metal or ammonium dithionate salts. Dissolve the crude tetrabromides (175 gr) in 1000 ml of fresh hot Skellysolve C (Note 6) and cool to X C without filtering. Alkaline, neutral and acidic dithionate based electrolytes offer numerous advantages with respect to power consumption, process performance and quality for a number of industrially important metal finishing processes. Some examples of the compositions covered by this invention include the following: The benefits of using dithionic acid based compositions are derived from a number of factors. of a 20% alcoholic potassium hydroxide. 2007 Oct 1;343(1-2):247-54. doi: 10.1016/j.ijpharm.2007.05.023. *Most of the material given here was taken from the literature but in a few cases, procedures developed at the authors’ laboratories are included. No. A 2 liter flask equipped with a gas inlet and outlet was charged with an aqueous solution of barium dithionate (prepared as in Example 1b), and a slow flow of nitrogen was initiated. (MP -8°-9° C)Notes: Procedure:Two kg of the unsaturated acids (Note1) from corn oil was dissolved in acetone (75 g/L) and crystallized in 2 tier batches at -50° C in a bath of dry ice and alcohol. 09/791,224, filed Feb. 22, 2001, now More elaborate (and inconvenient) methods of preparing ricinoleic acid have been reported. Kubo, M.; Kamitamari, T.; Hotsuta, T.; Masamoto, H.; Jpn. Place the entire assembly in a low-temperature bath (Note 3) and cool to 5° C. Cautiously transfer 75 ml (230gr) (Note 4) of bromine to the separatory funnel. The volume employed should contain a weight of hydroxide equal to the weight of the ester to be saponified. 3) Dithionic acid based electrolytes have been found to reduce the stress of nickel deposits relative to comparable sulfate based systems. The industry is constantly seeking new and improved electrolyte systems for the finishing of metal substrates which allow for favorable differentiation of plating processes relating, for instance, to electroplating speed, performance and electrodeposit quality. Another embodiment is an electroplating process employing a composition of the invention. The suspension was stirred and gently heated for 1 hour. The resulting deep blue solution of copper dithionate was evaporated in-vacuo to yield solid copper dithionate as a blue crystalline material (approximately 55% yield based on MnO2 with less than 0.8% sulfate impurity by IC analysis). with a mixture of benzene and ethyl acetate. Teeter spent most of his career at the Northern Regional Research Laboratory (NRRL) in Peoria, IL. Fresh, un-deteriorated sodium hydroxide should be used. All the crystalline reagents except boric acid should be dried at 110° to 120°C for 1 hour before use. How do I go about preparing and purifying the preparation? abandoned, which claims the benefit of U.S. The acidified aqueous dithionate solution was filtered free of the ion-exchange resin and then added to a beaker containing solid magnesium hydroxide (100 mmol). Another embodiment is an electroplating solution composition which contains metal or ammonium dithionate salts. Although the improvement seldom justifies the time and effort, further purification can be obtained by a final distillation through the column. The unreacted zinc should be preserved for subsequent debrominations. The mixture is refluxed and an equal volume of 7.5 N alcoholic hydrogen chloride is added gradually. The preferred range for dithionic acid is up to 25% by weight (stable in this range), but higher levels are occasionally useful. Red oil is the liquid fraction obtained by hydrogenation of fats followed by pressing. The Techni Copper U system additive (supplied by Technic, Inc. of Cranston, R.I.) was employed. Then, bring 1 pint of water to a boil in another non-metallic pot. Failure of the mixture to become homogeneous indicates that the catalyst has been inactivated by free fatty acid (or by moisture in the sodium hydroxide method). Straus, Hein, and Salzmann, Ber. Metal dithionates can be used up to their saturation solubility, preferred is 0.01M to 2M in metal, more preferred is 0.1M to 1M in metal. Always add the concentrated acid to water slowly with stirring. The acid number of the product should be determined. All rights reserved. HCl(aq) at room temperature followed by a DI water rinse. This and subsequent crystallizations were conducted with continuous stirring. For instance, surface tension lowering additives are used to, among other things, allow for the more efficient ejection of gas bubbles from the surface being electroplated. The panels were pretreated by exposure to 40 ASF of cathodic current for two minutes in an alkaline phosphate solution at 60° C. followed by a 1 minute pickle in a solution of 5% MSA at RT. Upon completion of the MnO2 addition, the excess SO2 was removed by heating the solution to 40° C. under a N2(g) sparge for 8 hours. The acetone was removed by warming under reduced pressure. Standardize the solution in the following manner. Refluxing is continued for 3 hours after which the methy linolenate is isolated in the manner described for methyl linoleate. Known plating electrolytes include, for instance, alkaline cyanide, acidic sulfate, acidic phosphate, acidic fluoborate and acidic methanesulfonate systems. 11) In general, any metal finishing solution containing dithionic acid, nickel dithionate and/or other metal dithionate salts. Also in another analogous reaction with sulfur dioxide, SO 2, an alkanesulphinic acid is formed. A 2 liter flask was charged with an aqueous solution of barium dithionate (all of the solution from 1b) and an equimolar amount of solid CuSO4 (a very concentrated aqueous solution can be used, addition with vigorous stirring). The reaction products can be separated by distilling off the azeotropic mixture of the aliphatic acid and water from which the acid can be recovered by solvent extraction, e.g. The addition of a catalyst such as potassium bisulfate should be helpful although the reference does not call for this. The information reported here was assembled by Dr. Howard Teeter (1915-1993) who took his Ph.D. under Professor Roger Adams at the University of Illinois in 1938. Unlike the ester, the free acid cannot be distilled without some decomposition. The white suspension was then filtered (note that the white manganese oxide collected in the filter turns brown and gummy when left in the air) to isolate pure aqueous barium dithionate (79% yield by IC analysis based on MnO2). If a precipitate appears at -20° C, it should be removed by filtration and discarded. The third column lists the amount of solute (acid) that is used to make 1 L of acid solution. 1, 2000. The conversion of the n-propanol was 100%. The electrolyte system can be acidic, neutral or alkaline. Use 2 gr of 90% ethanol/gr for recrystallizations. Cleaning and activation solutions do not require a source of metal ions for deposition, but such systems do require an optimized electrolyte composition. The Free Acidity of the Solution was 0.5 N. Visual analysis of the plated panels showed that formulas b), c) and d) allowed for an increased range of usable current density from 25-6 ASF to 30-2 ASF (47% improvement). The waste is siphoned off, the acid is washed with hot water and dried over anhydrous sodium sulfate and preserved under carbon dioxide. Another embodiment is a surface cleaning solution composition which contains free dithionic acid. The IIA metal salts of dithionic acid are very soluble in water, whilst the IIA metal salts of sulfuric acid are relatively insoluble in water. 8) Copper electroplating systems based on electrolytes containing dithionic acid, cupric dithionate and/or other metal dithionate salts. Nitric Acid Preparation ELECTROLESS NICKEL PLATING SOLUTION AND PLATING METHOD, ELECTROLESS PALLADIUM PLATING SOLUTION AND PLATING METHOD. The solid material removed consistently consisted of stearic acid (methyl stearate, octadecyl alcohol). Most food science programs do not include laboratory courses in the preparation of fatty acids and their derivatives. Bis(2-ammonium-2-methyl-1-propanol carbonate was Obtained by Saturating a Solution of 2-amino-2-methyl-1-propanol (AMP) with CO2 Followed by the Addition of a Second Equivalent of AMP). A 2 liter flask equipped with a gas inlet and outlet was charged with an aqueous solution of barium dithionate (prepared as in Example 1b), and a slow flow of nitrogen was initiated. There is a drawback though. The mixture was stirred for 15 minutes, removed from the bath and allowed to stand for 1 hour. The stream of carbon dioxide is maintained during subsequent operations. 282.2, calc 282.3, n20d 1.4585, purity 96%.Notes: Procedure:One thousand gr of USP olive oil was converted into methyl esters (Note 1) and fractionally distilled in vacuo to remove palmitic and lower esters. Cold saponification does not proceed to completion. The preferred range for dithionic acid is up to 25% by weight (stable in this range), but higher levels are occasionally useful. Thus, dithionic acid based electrolytes allow for the convenient addition of IIA metal salts, whilst sulfuric acid based electrolytes do not allow for such addition. The frozen nodules are filtered off on a Buchner funnel immersed in a dry ice bath. The mixture is decanted from the remaining zinc (Note1) into a 4 L separatory funnel. An analogous reaction of Grignard reagent is observed with carbon disulphide, CS 2, to give alkanedithionic acid. However red oil production extended beyond then. A 2 liter flask equipped with a gas inlet/outlet was charged with an aqueous solution of barium dithionate, and a slow flow of nitrogen was initiated in order to purge the reactor of oxygen. Thus, dithionic acid can be used as the basis for Sn/Pb solder plating solutions. Procedure:The free fatty acids from 200 gr safflower oil (Note 1) prepared as directed under “Saponification of free fatty acids” are made up with Skellysolve F (Note2) to a total of 2 liters. Anhydrous ethylene glycol may be obtained from good grade commercial products by refluxing in an open vessel until the temperature of the vapor reaches 197° C. This step is necessary to saponify esters as a result of the anhydrous conditions prevailing during isomerization. One embodiment of the invention is an aqueous solution of dithionic acid and/or dithionate salts which serves as a useful electrolyte for the electroplating of metallic coatings, especially, Sn, Cu, Ni, Zn and precious metals, onto metal or plastic substrates and/or other surfaces. E.g. Finally, a clear pink solution was obtained (82% yield of manganese dithionate by IC analysis based on MnO2, 2%–3% sulfate impurity also by IC analysis). Privacy Policy The description which follows sets forth additional features and advantages of the invention which, in part, will become apparent from the description or learned by practice of the invention. Methods of Preparation of Fatty Acids and Their Derivatives: Laboratory Exercises Saponification and Purification of Free Fatty Acids. This dithionic acid and/or these dithionate salts can be added in small amounts to function as additives, or this dithionic acid and/or these dithionate salts can be added in larger amounts to serve as a source of the metal(s) to be electroplated and/or as a major part of the conductive electrolyte. Experimental Laboratory, Grasselli Chemicals Department, E. I. du Pont de Nemours & Company, Inc., Cleveland, Ohio. The ether solution is washed with dilute (5%) potassium carbonate and evaporated. The color disappears during the debromination of methyl linoleate. Another embodiment is an electroless or immersion plating composition for nickel or palladium, which contains dissolved nickel dithionate, palladium dithionate, other metal dithionate or ammonium dithionate salts at concentrations greater than 0.1 M. Another embodiment is the use of an solution containing dissolved metal or ammonium dithionate as a rust removing agent. Remove traces of water by bubbling an inert gas through the product in vacuo. The solution is then evaporated and the methyl esters are purified by distillation at reduced pressure.Procedure B:The oil and an equal weight of methanol are placed in the flask and brought to reflux. ProcedureReflux for 15 minutes a mixture of 200 gr. The neutralization equivalent should be about 280, acid value 200. This change usually occurs at or very shortly after the time of refluxing begins (Note 4) The mixture is then refluxed for 2 hours. (Note 1) The oil, an equal weight of methanol, and 0.5% of sodium methoxide (Note 2) are placed in the flask. This material is sufficiently pure for most purposes. Two recrystallizations from petroleum ether gave snow white crystals. If high the best method for deacidification is to follow the esterification procedure above. One piece of rusted steel was submerged in the sulfate solution while the other piece was submerged in the dithionate solution. The clear filtrate of mixed dithionic acid and stannous dithionate was then used as is (approximately 70% yield with less than 1% sulfate impurity by IC analysis). Add 980 mL of deionized water. was used as a reference: 15 g/l tin as Ronastan TP tin 300 concentrate (aqueous stannous methanesulfonate solution at 300 g/l as tin), 30 ml/l Ronastan TP acid 70 (70% aqueous MSA), 70 ml/l Ronastan TP-HCD Primary (a proprietary additive sold by Shipley Ronal (Marlborough, Mass. 1(e) Preparation of Mixed Dithionic Acid & Stannous Dithionate.