摘要:
A method for the reduction in iodine content in a mixture, particularly in a mixture of carboxylic acids and/or carboxylic anhydrides with alkyl iodides and/or hydriodic acid, comprises contacting the organic medium in the vapour phase at elevated temperature with a metal salt dispersed on activated charcoal. The metal salt may be a carboxylate salt, a carbonate, an oxide, a hydroxide and any other salt, which may react with the organic medium to give a metal carboxylate salt. The metal may be a main group element, a lanthanide, an actinide, zinc and copper. This process converts alkyl iodide compounds converted to their corresponding carboxylate esters, while the iodine is bound in the purification mass as inorganic iodide.
摘要:
The present invention relates to (co)polymers comprising at least one imide function, making use of at least one diamine chosen from 2,5-bis(aminomethyl)furan and 2,5-bis(aminomethyl)tetrahydrofuran, or diisocyanate equivalents thereof. These (co)polymers can be converted into articles by various methods.
摘要:
A process for producing C 10 -C 26 rnonobranched fatty acids or alkyl esters thereof which includes isomerising unsaturated C 10 -C 26 fatty acids or alkyl esters thereof in the presence of a catalyst which comprises both a zeolite and a Lewis base. The zeolite can be reused after simple separation from the reaction products without having to regenerate. The process is particularly suitable for producing highly rnonobranched fatty acids or alkyl esters thereof.
摘要:
A process for purifying a dicarboxylic acid that is derived from the mixed oxidation products from an ozonization of a mixture containing an ethylenically unsaturated compound having between 6 to 24 carbons, the process includes distilling the mixed oxidation products to provide a first distillate and a second distillate, partitioning the second distillate between an aqueous layer and an organic solvent layer to extract a C9 to C22 monocarboxylic acid impurity, separating the organic solvent layer from the aqueous layer, and isolating the dicarboxylic acid having a residual content of the C9 to C22 monocarboxylic acid impurity in an amount that is less than 0.5% by weight.
摘要:
A symmetrical anhydride of formula (I) is produced by reacting a mixed anhydride (II) with a carboxylic acid (III), R1 being alkyl, alkenyl, aryl, alkylaryl, aralkyl; R2 being alkyl in C¿1?-C40, alkenyl in C1-C40, aryl, aryl-(alkyl in C1-C40) and (alkyl en C1-C40)-aryl.
摘要:
A process for producing products from biomass comprising fermenting biomass to produce a first product stream comprising carboxylic acid salts; acidifying at least one of the first product stream and a second product stream to produce a third product stream comprising acids; extracting such acids from the third product stream with a solvent; separating the extracting solvent from the acids to produce the separated extracting solvent and a fourth product stream comprising acids; and processing the fourth product stream to produce a fifth product stream.
摘要:
Disclosed is a process for the separation of water from a liquid phase medium containing an aliphatic carboxylic acid using azeotropic distillation in the presence of an entrainer. The entrainer, water, and organics are subsequently separated, wherein the entrainer is recycled back to the azeotropic distillation column and organics recycled back to the oxidation reactor.