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Adipic acid consumption is linked almost 90% to nylon production by the polycondensation with hexamethylenediamine.

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National Library of Medicine - Adipic Acid

A method for the synthesis of the industrially relevant monomers adipic acid, 1,6-hexanediol (HDO), and 1,6-hexanediamine (HMD) via isomerizing hydroformylation of 1,3-butadiene is described. The aldehyde intermediates are protected in situ as acetals to avoid hydrogenation to pentanal. Adipic aldehyde diacetal is obtained in good yields, and the first examples for the conversion toward adipic acid, 1,6-hexanediol, and 1,6-hexanediamine are shown.

Adipic acid is used in manufacturing plasticizers and lubricants components.

N2 - The structure and molecular weight of the hyperbranched polyesterification of adipic acid and glycerol were characterized by 13C NMR spectroscopy and size-exclusion chromatography as a function of reaction time and reaction stoichiometry. The glycerol substitution patterns and the extent of reaction of both glycerol and adipic acid were determined by NMR. The glycerol species concentrations determined by NMR were used with a Macosko-Miller conditional probability model to predict the hyperbranched polyester weight-average molecular weight. The model accommodated the difference in primary and secondary -OH reactivity and any substituent effects to glycerol -OH reactivity. In all cases, the predicted weight-average molecular weights were in excellent agreement with the absolute molecular weights determined by size-exclusion chromatography with light scattering detection.

Synthesis of Adipic Acid - Chempedia - LookChem

Food grade adipic acid is used as gelling aid, acidulant, leavening and buffering agent.

A method for the synthesis of the industrially relevant monomers adipic acid, 1,6-hexanediol (HDO), and 1,6-hexanediamine (HMD) via isomerizing hydroformylation of 1,3-butadiene is described. The aldehyde intermediates are protected in situ as acetals to avoid hydrogenation to pentanal. Adipic aldehyde diacetal is obtained in good yields, and the first examples for the conversion toward adipic acid, 1,6-hexanediol, and 1,6-hexanediamine are shown.

The direct synthesis of adipic acid from hydrogen peroxide and cyclohexene was investigated in capillary microreactors at high temperature (up to 115 °C) and pressure (up to 70 bar). High temperature was already applied in microflow packed-bed reactors for the direct adipic acid synthesis. In our previous work we showed that the process suffered from unavoidable gas generation due to hydrogen peroxide decomposition when working at low pressure. Herein, we used a high pressure strategy to minimize hydrogen peroxide decomposition. Huge hotspots were observed inside a microflow packed-bed reactor under high pressure conditions. Capillary microreactors display a better heat transfer efficiency and thus may provide a better alternative for scaling-up. Consequently, capillary microreactors were selected for the reaction process with high pressure. One assisting element is the addition of phosphoric acid which is generally known to reduce the decomposition of H2O2. The use of phosphoric acid had a positive influence on the isolated yield. We could improve the yield further by increased interfacial mass transfer between the organic and aqueous slugs, when increasing the flow rate while keeping the same residence time. A further gain was given by using the of 2-stage temperature ramping strategy which we recently introduced for the microflow packed bed reactor. Applying all these aspects led to a maximum yield of 59% at 70–115 °C and 70 bar. The stabilizing effect of phosphoric acid on H2O2 is more obvious in a the 2-stage temperature ramping scenario as in a single-temperature operation. In addition, channel clogging by adipic acid precipitation in the microreactor was observed. Therefore, several useful strategies were proposed to prevent channel clogging at high temperature and pressure.

Patent US5487987 - Synthesis of adipic acid from …

Adipic acid has two carboxylic acid, -COOH, groups, which can yield two kinds of salts.

Adipic acid has also been incorporated into controlled-release formulation matrix tablets to obtain pH-independent release for both weakly basic and weakly acidic drugs.

AB - The structure and molecular weight of the hyperbranched polyesterification of adipic acid and glycerol were characterized by 13C NMR spectroscopy and size-exclusion chromatography as a function of reaction time and reaction stoichiometry. The glycerol substitution patterns and the extent of reaction of both glycerol and adipic acid were determined by NMR. The glycerol species concentrations determined by NMR were used with a Macosko-Miller conditional probability model to predict the hyperbranched polyester weight-average molecular weight. The model accommodated the difference in primary and secondary -OH reactivity and any substituent effects to glycerol -OH reactivity. In all cases, the predicted weight-average molecular weights were in excellent agreement with the absolute molecular weights determined by size-exclusion chromatography with light scattering detection.

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  • Adipic acid for synthesis | VWR

    T1 - Synthesis and characterization of glycerol-adipic acid hyperbranched polyesters

  • Emerging catalytic processes for the production of adipic acid

    Acyl (-CO) is an organic radical formed by removal of a hydroxyl group from an organic acid (carboxyl group).

  • Adipic Acid for synthesis - ITW Reagents

    Google patentsRoew, Raymond (2009), "Adipic Acid", Handbook of Pharmaceutical Excipients, pp.

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Adipic Acid Synthesis - [PDF Document]

The structure and molecular weight of the hyperbranched polyesterification of adipic acid and glycerol were characterized by 13C NMR spectroscopy and size-exclusion chromatography as a function of reaction time and reaction stoichiometry. The glycerol substitution patterns and the extent of reaction of both glycerol and adipic acid were determined by NMR. The glycerol species concentrations determined by NMR were used with a Macosko-Miller conditional probability model to predict the hyperbranched polyester weight-average molecular weight. The model accommodated the difference in primary and secondary -OH reactivity and any substituent effects to glycerol -OH reactivity. In all cases, the predicted weight-average molecular weights were in excellent agreement with the absolute molecular weights determined by size-exclusion chromatography with light scattering detection.

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