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首页> 外文期刊>Catalysis science & technology >Synthesis of adiponitrile from dimethyl adipate and ammonia in the vapor-phase over niobium oxide
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Synthesis of adiponitrile from dimethyl adipate and ammonia in the vapor-phase over niobium oxide

机译：从氧化二甲基二甲基二甲基和氨中合成氧化二甲基和氨的合成

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摘要

An environmentally benign route leading to adiponitrile (ADN), a nylon-6,6 intermediate, was achieved by direct vapor-phase nitrilation of dimethyl adipate (DMA) with ammonia (NH3) in a fixed-bed reactor. The challenges of this reaction include not only inhibiting both intramolecular cyclization and the intermolecular polycondensation of the electron-withdrawing group functionalized carbon chain but also suppressing the thermolysis of aliphatic DMA and ADN. Both amphoteric oxides and acidic oxides enable the transformation but exhibit different reactivities. Under evaluation conditions, the acidic oxides exhibit moderate to good nitrile selectivity, while the amphoteric oxides exhibit high DMA conversions with relatively low nitrile selectivity. Under the optimized conditions, the desired ADN was obtained with a selectivity of 84.3% with 97.7% DMA conversion over Nb2O5-1000 consisting of a monoclinic structure/phase (H-Nb2O5). The structure–performance relationship of this catalyst was preliminarily discussed. Furthermore, a tentative reaction pathway consisting of ammonolysis and dehydration processes in a tandem mode was proposed.
机译：通过固定型反应器中的氨基二甲基（DMA）的直接蒸气 - 二甲基（DMA）直接蒸气 - 二甲基（DMA），通过直接蒸气 - 二硝酸二硝酸二硝基化来实现脂肪诺（ADN）的环境良性途径。该反应的挑战不仅包括抑制分子内环化和电子吸引电子组功能化碳链的分子间多头敏，还抑制了脂肪族DMA和ADN的热解。两性氧化物和酸性氧化物都可以转化，但表现出不同的反应性。在评估条件下，酸性氧化物表现出中度至良好的硝酸选择性，而两性氧化物则表现出较高的DMA转化率，氮选择性相对较低。在优化的条件下，以84.3％的选择性为84.3％，在NB2O5-1000上获得了97.7％的DMA转换，获得了所需的ADN，由单斜结构/相（H-NB2O5）组成。初步讨论了该催化剂的结构 - 性能关系。此外，提出了在串联模式下由氨解和脱水过程组成的暂定反应途径。

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