第 38 卷第 3 期 |  | Vol. 38 No. 3 | 2008 年 6 月 | Jun 2008 |
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所屬欄目:醫藥及中間體
對二甲苯選擇性氧化合成對甲基苯甲酸 |
仇振華
(石家莊化纖有限責任公司,河北 石家莊 050032) |
摘 要:使用1,4-二氨-2,3-二氯蒽醌(DACAQ)與N-羥基鄰苯二甲酰亞胺(NHPI)非金屬催化劑實(shí)現了對二甲苯空氣選擇性氧化合成對甲基苯甲酸。分別加入NHPI 4%(n/n)和DACAQ 1%(n/n,以反應物總量計)為催化劑,在氧氣壓力0.9 MPa、溫度為120℃的條件下,反應2 h,對二甲苯轉化率達59%,對甲基苯甲酸產(chǎn)品選擇性達70%。與傳統金屬催化劑相比,采用該非金屬催化體系產(chǎn)品選擇性大大提高,為對甲基苯甲酸的工業(yè)化生產(chǎn)提供了一條更具吸引力的途徑。 |
關(guān)鍵詞:非金屬;空氣氧化 ;對甲基苯甲酸;蒽醌;N-羥基鄰苯二甲酰亞胺 |
中圖分類(lèi)號:TQ227.1 文獻標識碼:A 文章編號:1009-9212(2008)03- 0039-03 |
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Selective Oxygenation of p-Xylene to p-Toluic Acid Catalyzed by 1,4-Diamino-2,3-dichloro-anthraquinone and N-Hydroxyphthalimide |
QIU Zhen-hua
(Shijiazhuang Chemical Fiber Limited Company,Shijiazhuang 050032,China) |
Abstract:Selective aerobic oxidation of p-xylene to p-toluic acid was successfully achieved by the use of non-metal catalyst,N-hydroxyphthalimide(NHPI),in the presence of 1,4-diamino-2,3-dichloro-anthraquinone(DACAQ). After optimization,p-xylene was oxidized with 59% conversion and 70% selectivity for p-toluic acid at 120°C under 0.9 MPa of O2 for 2 h when NHPI(4.0%,n/n) and DACAQ(1.0%,n/n)was employed. The selectivity notably increased with this metal-free catalytic system compared with traditional metal catalyst,which may lead us to a more promising route for the industrial production of p-toluic acid. |
Key words:metal-free;aerobic oxidation;p-toluic acid;anthraquinones;N-hydroxyphthalimide |
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作者簡(jiǎn)介:仇振華(1976-),男,河北石家莊人,工程師,碩士,從事化纖技術(shù)開(kāi)發(fā)工作。(E-mail:cupper21@163.com)
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收稿日期:2008-06-05
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