Abstract:
The object of the present invention is to provide a process for industrially preparing a fluorocarboxylic acid in high purity and in high yield. The present invention is a process for preparing a fluorocarboxylic acid, which comprises: a dehydration step of removing from a mixture containing a fluorocarboxylic acid and water at least a part of said water to obtain a dehydrated fluorocarboxylic acid solution; and a purification step of purifying said dehydrated fluorocarboxylic acid solution.
Abstract:
Various C and C carbon labeled compounds Rf- CF(U)y(T)z Formula 1A or Rf- CF2 CF(U)y(T)z Formula 1B wherein Rf is a linear or branched perfluoroalkyl radical Z(CmF2m)-, m is 1, 3 to 20, or a mixture thereof; Z is F when m is 1, and Z is F, Cl, or H when m is 3 to 20 or a mixture thereof; b is 13 or 14; y is 1, and z is 0 or 1; and when y and z are each 1, U is F, and T is selected from the group consisting of monovalent radicals -X wherein X is I or Br, -CH2-CH2-X, -CH=CH2, -CH2-CH2-OH, -CH2-COOH, -CH2OH, - CH2OH, -COOH, - COOH, -O-CF(CF3)-C(O)F, -O-CF(CF3)-X, -SO2Y wherein Y is H, F or Cl, and -SO3H; and when y is 1, and z is 0, U is selected from the group consisting of divalent radicals =CH-COOH, =CH-CH2-OH, and =O, are disclosed, and a process for their preparation which selectively introduces C and C carbon labels into a fluoroalkyl chain.
Abstract:
A fluorocarboxylic acid preparation process continuously carries out acidification reaction treatment and washing treatment, and includes subjecting a fluorocarboxylate-containing aqueous solution to acidification reaction treatment in the presence of sulfuric acid so as to form a sulfate-containing fluorocarboxylic acid phase; and subjecting the fluorocarboxylic acid phase to washing treatment using an aqueous sulfuric acid solution.
Abstract:
A salt of a divalent metal and a salt of a trivalent metal are added to a solution containing a fluorine compound and a fluoropolymer to precipitate a lamellar composite hydroxide containing the fluorine compound between lamellae and to simultaneously coagulate and precipitate the fluoropolymer suspended in the solution. Thus, a large proportion of the fluorine compound is fixed and separated from the solution together with the fluoropolymer. They are recovered according to need. By this treatment method, a fluorine compound and a fluoropolymer contained in wastewater or the like can be easily separated therefrom and the burden to be imposed on the environment or an ecological system can be lessened.
Abstract:
This invention concerns a process for recovering highly fluorinated carboxylic acids from waste gas streams in which the waste gas is brought into contact with an alkaline wash solution > 1.15 g/cm , so that the salt of the highly fluorinated carboxylic acid precipitates as a separate phase. This process is particularly advantageous if the alkaline wash solution is a potassium carbonate solution.
Abstract:
Disclosed is a novel class of antiandrogenic compounds including saturated and unsaturated fatty acids, their derivatives, and synthetic analogs, their method of synthesis, and their use in treating disorders associated with androgenic activities. Also disclosed is the use of known compounds not previously known for their antiandrogenic activity in treating disorders related to androgenic activities.
Abstract:
The present invention generally relates to processes for converting acrylate esters or a derivative thereof to difluoropropionic acid or a derivative thereof. This process is generally performed using fluorine gas in a hydrofluorocarbon solvent.
Abstract:
A process for the preparation of a fluorinated acid of the formula R f COOH, wherein the process includes the step of contacting: (i) a fluorinated alcohol of the formula R f CH 2 OH; and (ii) periodic acid; wherein each R f is independently selected from linear, branched or cyclic hydrocarbyl of 1-12 carbon atoms having 1-25 fluorine atoms and any range there between; and wherein the contacting step is carried out in the presence of a catalyst and optionally in a reaction medium, at a temperature and length of time sufficient to produce the fluorinated acid.
Abstract translation:一种制备式R f COOH的氟化酸的方法,其中所述方法包括使以下步骤:(i)式R f F f的氟化醇, CH 2 SUB> OH; 和(ii)高碘酸; 其中每个R f独立地选自具有1-25个氟原子的1-12个碳原子的直链,支链或环状烃基,其间的任何范围; 并且其中所述接触步骤在催化剂存在下,任选地在反应介质中,在足以产生氟化酸的温度和时间长度下进行。
Abstract:
A fluorocarboxylic acid preparation process which includes hydrolyzing fluorocarboxylic acid fluoride in the presence of an aqueous sulfuric acid solution to form a reaction product containing a fluorocarboxylic acid and hydrogen fluoride (present as hydrofluoric acid); and removing at least some of the hydrogen fluoride from the reaction product by washing the reaction production with aqueous sulfuric acid solution. The hydrolyzing and washing are carried out at a temperature at which the fluorocarboxylic acid is a liquid.