that is emitted from industrial adipic acid synthesis

“Synthesis and Recrystallization of Adipic Acid” 1) Source(s) Experiment 5, Doxsee, K
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Synthesis of Adipic Acid from Cyclohexene - …

These methods have the disadvantages associated with low selectivity n/b 50-60%, the complexity of the isolation and purification trademarks of adipic acid from impurities and traces.

The commercially favored route to adipic acid is the oxidative cleavage of Cyclohexane
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Synthesis Of Adipic Acid From Cyclohexene ..

SUBSTANCE: invention relates to novel compounds of general formula (I) , in which A is selected from one or several X and/or Y groups; X represents methylene group; Y represents C2-alkinylene group; n represent integer number from 1 to 5; R1 represents group R2, optionally substituted with one or several R3 and/or R4 groups; R2 represents group selected from pyridinyl, pyrimidinyl, pyridazinyl, imidazolyl, oxazolyl, pyrazolyl, isoxazolyl, oxadiazolyl, naphtyl, chinolinyl, isochinolinyl, dihydroisochinolinyl, 2-oxo-3,4-dihydrochinolinyl, indolyl, benzimidazolyl, pyrrolopyridinyl; R3 represents group selected from halogen atoms, groups C1-6-alkyl, C3-7-Cycloalkyl, C1-6-alkoxy, NR5R6 and phenyl; R4 represents group selected from groups: phenyl, naphtyl, pyridinyl; R4 group or groups can be substituted with one or several R3 groups, similar or different from each other; R5 and R6 independently on each other represent C1-6-alkyl group; R7 represents hydrogen atom or C1-6-alkyl group; R8 represents hydrogen atom or group C1-6-alkyl, C3-7-cycloalkyl, C3-7-Cycloalkyl- C1-3-alkylene; in form of base, acid-additive salt, hydrate or solvate. Invention also relates to methods of obtaining formula (I) compound by any of ii. 1-3, to compounds, determined by general formula (IV), (VII), to pharmaceutical composition, as well as to application of formula (I) compounds by any of ii. 1-3.

15/01/2018 · Adipic acid via oxidation of cyclohexanone - Duration: ..
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SUBSTANCE: invention relates to a carboxylic acid synthesis method. The invention specifically relates to a method for synthesis of carboxylic acids through oxidation of a hydrocarbon with oxygen or an oxygen-containing gas, and more specifically to oxidation of cyclohexane to adipinic acid. According to the invention, the method involves a step for oxidising the hydrocarbon and at least one step for extracting the formed dicarboxylic acids from the reaction medium and, in known cases, return unconverted hydrocarbon and oxidation by-products such as ketones and alcohols which may be formed to the reaction. The disclosed method also includes a step for conversion, separation or extraction of α,ω-hydroxycarboxylic compounds formed during oxidation. This step for conversion, separation or extraction of α,ω-hydroxycarboxylic compounds involves oxidation of medium containing the said compounds in order to convert them to dibasic acids.

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5 Synthesis and Recrystallization of Adipic Acid 135 ..

Examples 1-3 performed by varying the temperature from 75 to 100°C at a constant concentration of sulfuric acid, 0.23 mol/kg of the reaction mass in order to clarify the effect of temperature on the process. The oxidation process cubes distillation at the temperature of 75-90°C. (examples 1-2) slow (30-28 hours), the conversion of caprolactam 90-93%, the yield of adipic acid from theory does not exceed 58%. At a temperature of 100°C. (example 3) for 14 hours at a conversion of 94% yield AK is 81%.

Method for adipic acid preparation from ..

1. Method for producing adipic acid by oxidation of caprolactam, where the quality of raw materials used caprolactamate waste of caprolactam - Cuba distillation of the caprolactam production by oxidation of cyclohexane, containing caprolactam at least 90%, at a temperature of 75-100°C in liquid medium, characterized in that the reaction is carried out using an oxidant, which is a mixture of 30% hydrogen peroxide, taken to the Icesave H2O2/CL (1-1,1)/1 mol/mol, and concentrated sulfuric acid (96%) in an amount of 0.2 to 0.36 mol/kg of the reaction mass in which oxidat acidified with concentrated sulfuric acid to selection of adipic acid.

crystallization and recrystallization of the purified adipic acid ..

SUBSTANCE: invention is related to combined method, which combines olefin epoxidation with preparation of cyclohexanone and cyclohexanol, which are intermediate for production of adipic acid or caprolactam - nylon precursors. Usually cyclohexanone and cyclohexanol are produced by oxidation of cyclohexane with production of cyclohexylhydroperoxide, which is then removed or decomposed. However, in this invention intermediate compound, cyclohexylhydroperoxide is used as oxidant for olefin epoxidation with valuable product making in this process. In process of epoxidation catalyst is used, which contains transition metal and amorphous porous inorganic oxide, which has disorderly interconnected mesopores. The specified mesopores account for at least around 97 volume percents from total volume of mesopores and micropores. Specified porous inorganic oxide has specific area surface from 400 to 1100 m2/g.

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The method of oxidation can be performed continuously or periodically. Oxidat at the end of the reaction is treated with sulfuric acid at the rate of 0.5 mol of acid per 1 mol of caprolactam, which allows, on the one hand, to highlight AK and recycling unoxidized or partially oxidized compounds (for example, adipamide and amide of adipic acid). After washing, recrystallization and drying was determined by the melting point of adipic acid (tPL=155-155 .5°C).