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Potassium sebacate

The adsorption of QBr on the solid surface of SeK2 plays an insignificant role in the kinetic description. The solid-liquid equilibrium of KBr between its soluble parts and solid parts is still existed. Wu [217] reported that the kinetic data for S-shape curves were found in this system, as shown in Fig. 8 for different amounts of potassium sebacate used. This revealed that the catalytic transition complex [R-Br-Q-Br] in the organic phase would lead to a long induction period for the reaction of SeK2 with TC. [Pg.337]

The position of the triple bond is established by oxidation of the latter by means of alkaline potassium permanganate solution to sebacic acid, H02C(CH2)gC0jH, m.p. 133°. [Pg.469]

Oxidation of 10-undecynoic acid to sebacic acid. Dissolve 2 00 g. of the acid, m.p. 41-42°, in 50 ml. of water containing 0 -585 g. of pure anhydrous sodium carbonate. Saturate the solution with carbon dioxide and add O IN potassium permanganate solution (about 1500 ml.) slowly and with constant stirring until the pink colour remains for half an hour the addition occupies about 3 hours. Decolourise the solution with a httle sulphur dioxide and filter off the precipitated acid through a... [Pg.469]

The by-product of this process, pelargonic acid [112-05-0] is also an item of commerce. The usual source of sebacic acid [111-20-6] for nylon-6,10 [9008-66-6] is also from a natural product, ticinoleic acid [141-22-0] (12-hydroxyoleic acid), isolated from castor oil [8001-79-4]. The acid reacts with excess sodium or potassium hydroxide at high temperatures (250—275°C) to produce sebacic acid and 2-octanol [123-96-6] (166) by cleavage at the 9,10-unsaturated position. The manufacture of dodecanedioic acid [693-23-2] for nylon-6,12 begins with the catalytic trimerization of butadiene to make cyclododecatriene [4904-61-4] followed by reduction to cyclododecane [294-62-2] (see Butadiene). The cyclododecane is oxidatively cleaved to dodecanedioic acid in a process similar to that used in adipic acid production. [Pg.236]

Alkali Fusion. Tha alkaU fusion of castor oil using sodium or potassium hydroxide in the presence of catalysts to spHt the ricinoleate molecule, results in two different products depending on reaction conditions (37,38). At lower (180—200°C) reaction temperatures using one mole of alkah, methylhexyl ketone and 10-hydroxydecanoic acid are prepared. The 10-hydroxydecanoic acid is formed in good yield when either castor oil or methyl ricinoleate [141-24-2] is fused in the presence of a high boiling unhindered primary or secondary alcohol such as 1- or 2-octanol. An increase to two moles of alkali/mole ricinoleate and a temperature of 250—275°C produces capryl alcohol [123-96-6] CgH gO, and sebacic acid [111-20-6] C QH gO, (39—41). Sebacic acid is used in the manufacture of nylon-6,10. [Pg.154]

An electrooxidation process was developed by Asahi Chemical Industry ia Japan, and was also piloted by BASF ia Germany. It produces high purity sebacic acid from readily available adipic acid. The process consists of 3 steps. Adipic acid is partially esterified to the monomethyl adipate. Electrolysis of the potassium salt of monomethyl adipate ia a mixture of methanol and water gives dimethyl sebacate. The last step is the hydrolysis of dimethyl sebacate to sebacic acid. Overall yields are reported to be about 85% (65). [Pg.63]

Dioctyl sebacate (DOS) with relative permittivity e of 3.9 and 2-nitrophenyl octyl ether (NPOE) with e = 23.9 are the traditionally used sensor membrane plasticizers. The choice of a plasticizer always depends on a sensor application. Thus, NPOE appears to be more beneficial for divalent ions due to its higher polarity, but for some cases its lipophilicity is insufficient. Furthermore, measurements with NPOE-plasticized sensors in undiluted blood are complicated by precipitation of charged species (mainly proteins) on the sensor surface, which leads to significant potential drifts. Although calcium selectivity against sodium and potassium for NPOE-based membranes is better by two orders of magnitude compared to DOS membranes, the latter are recommended for blood measurements as their lower polarity prevents protein deposition [92],... [Pg.124]

Figure 10. Burning rate of PVC plastisol propellant oxidized with potassium perchlorate (equal parts PVC and dibutyl sebacate) (10)... Figure 10. Burning rate of PVC plastisol propellant oxidized with potassium perchlorate (equal parts PVC and dibutyl sebacate) (10)...
Dimethyl and diethyl octadecanedioate have been prepared by the electrolysis of the sodium or potassium salts of methyl or ethyl hydrogen sebacate in water8 or in methanol. ... [Pg.19]

To 86 5 g. (o 38 mole) of ethyl hydrogen sebacate (Org. Syn. 19, 45) is added slowly and with cooling 125-130 cc. of approximately 3 N potassium hydroxide. The solution is then diluted to approximately 250 cc., yielding a 1.5IV solution of potassium ethyl sebacate. [Pg.48]

The solution of potassium ethyl sebacate (Note 1) is poured into a 500-cc. tall type beaker provided with a cooling coil (Note 2), a thermometer, a stirrer, a platinum sheet anode 45-55 sq. cm. in area (Note 3), and two platinum wire cathodes (Note 4). To the solution 10 g. of monoethyl sebacate (Note 5) is added. [Pg.48]

As the potassium salt of monoethyl sebacate is decomposed during the electrolysis, the free acid forms new salt. The alkalinity of the solution may, therefore, be used as the end-point of the electrolysis. [Pg.49]

Diethyl 1,16-hexadecanedicarboxylate has been prepared by the electrolysis of potassium ethyl sebacate.1... [Pg.50]

Reagents used to formulate the membranes are valinomycin, nonactin, dibenzo(18-crown-6), bis(2-ethylhexyl) sebacate, bis(l-butylpentyl) adipate, poly(vinyl chloride) (PVC) (high molecular weight), potassium tetrakis(4-chlorophenyl)borate, all from Fluka. The different components are dissolved in tetrahydrofuran (Fluka) to form a membrane cocktail. [Pg.1246]

Prepare the cocktail for the potassium sensor membrane mixing in a 3mL glass vial the following substances 0.0025 g of valinomycin (ionophore), 0.075 g of poly(vinyl chloride) (PVC), 0.165g of bis(2-ethylhexyl)sebacate (plasticizer), 0.0015 g of potassium tetrakis(4-chlorophenyl)borate (ionic additive) and 1.5 mL of tetrahydrofuran (THF). Cover the vial and shake it well, preferably in an orbital shaker for 30 min in order to dissolve and to homogenize the mixture. The resultant cocktail will suffice to prepare 10 sensors. [Pg.1247]

The membrane used to activate this potassium-selective IWAO [134] consists of a potassium bulk optode based on 0.5 wt % chromoionophore ETH 5294, 1.0 wt% ionophore valinomycin, 0.5 wt% ionic additive potassium tetrakis(4-chlorophenyl)borate (KtpClPB), 31.0 wt % polymer PVC, 67.5 wt % organic solvent and plasticizer bis(2-ethylhexyl)sebacate (DOS) [142], This commercially available optode not only acts as an example of the development of an enhanced ion-selective IWAO, but also serves to validate the previously remarked features, because results can be compared with the ones obtained with membranes of the same composition and thickness in a con-... [Pg.36]

The process starts from the potassium salt of the adipic acid half ester (about 10 to 30 mol % neutralized). It has successfully been scaled up to the experimental production scale by Asahi. A simplified process scheme for the entire synthesis is shown in 225). While Asahi was predominantly concerned with the anodic oxidation of monomethyl adipate, BASF mainly worked on the synthesis of sebacates of higher alcohols. [Pg.25]

PROP Contains 5% cadmium sebacate, 5% potassium chromate, 1% malachite green, and 16% thiram (FMCHA2 -,D176,80). CONSENSUS REPORTS Cadmium and its compounds, as well as chromium and its compounds, are on the Community Right-To-Know List. [Pg.814]

Undecylenic acid (10-undecenoic acid), when treated with potassium permanganate and sodium periodate in an aqueous solution of potassium carbonate at 20 °C for 20 h, gives sebacic acid (decane dioic acid) in 73% isolated yield [763]. A similar oxidation of oleic or elaidic acid yields a mixture of pelargonic acid and azelaic acid [763] (equation 474). [Pg.226]

Ammonium Bromide Ammonium Bisulfide Ammonium Hydrosulfide Ammonium Fluoride Ammonium Chloride Sal Ammoniac Santoprene 101-55 Santoprene 101-64 Santoprene 101-73 Santoprene 201-55 Santoprene 203-50 Calcium Hydrosulfide Ammonium Sulfide Potash Potassium Stannate Cumaldehyde Diphenylamine Amyl Cinnamaldehyde Phenoxyacetic Acid Diethylhexyl Sebacate (2-) Bis(2-Ethylhexyl) Sebacate Dioctyl Sebacate Phenyl Acetate Phenoxyethanol (2-) Ethylene Glycol Phenyl Ether Arcel... [Pg.1085]

The rates of alkaline hydrolysis of the half-esters, potassium ethyl oxalate, malonate, adipate, and sebacate were studied in the presence of potassium, sodium, lithium. thallium(I), calcium(II), barium(II), and hexamminecobalt(III) ions (106). On the basis of the results obtained, chelate formation between the metal ions and the transition state of the substrate was postulated. In these chelate structures (structures XXXVIII), formally similar to those postulated in the hydrolysis of a-amino esters (26), the metal ion facilitates the attack by the hydroxide ion by positioning it in a suitable manner. The rate of hydrolysis of the oxalate half-ester is greater than that of the malonate, which in turn is greater than that of the adipate. This is in the expected order of the stability of the metal chelates. The order for the rate of hydrolysis of the ethyl oxalate and ethyl malonate is Ca2+ Ba2+ > [Co(NH3)6]3+ > T1+. The hexamminecobalt(III) ion seems to be less effective than expected, since it is too large to satisfy the steric requirements of the chelate structures. The alkali metals were found to have marked negative specific salt effects on the rates of reaction of the adipate and sebacate, but only a small negative salt effect on the hydrolysis of potassium ethyl malonate. [Pg.216]

Sebacic acid from the ethyl-potassium salt of adipic acid. [Pg.58]

In this way it was possible to isolate methyl-acrylic acid by the electrolysis of ethyl-potassium dimethyl-malonate, and ethyl-crotonic acid by electrolyzing a solution of the ethyl-potassium salt of diethyl-malonic acid. On the electrolysis of sebacic acid the ethyl ester of an unsaturated acid, CHj CH(CH,),.COOH, was formed. [Pg.60]


See other pages where Potassium sebacate is mentioned: [Pg.311]    [Pg.264]    [Pg.54]    [Pg.55]    [Pg.58]    [Pg.450]    [Pg.1079]    [Pg.405]    [Pg.279]    [Pg.58]   
See also in sourсe #XX -- [ Pg.357 ]




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