{"id":3696,"date":"2019-05-30T19:51:48","date_gmt":"2019-05-30T11:51:48","guid":{"rendered":"http:\/\/woodrefinery.com\/zhenfang\/?p=3696"},"modified":"2020-09-12T17:52:28","modified_gmt":"2020-09-12T09:52:28","slug":"production-of-n-containing-compounds-from-plastic-wastes-by-fast-pyrolysis","status":"publish","type":"post","link":"https:\/\/woodrefinery.com\/zhenfang\/production-of-n-containing-compounds-from-plastic-wastes-by-fast-pyrolysis\/","title":{"rendered":"Production of N-containing compounds from plastic wastes by fast pyrolysis"},"content":{"rendered":"

Production of N-containing compounds from plastic wastes by fast pyrolysis<\/strong><\/p>\n

Recently, Dr. Lujiang Xu and Prof. Zhen FANG have developed a catalytic pyrolysis process with ammonia for direct conversion of polyethylene terephthalate (PET) to produce N-containing compounds such as Terephthalonitrile (TPN).<\/p>\n

\"\"<\/p>\n

Production of terephthalonitrile from polyethylene terephthalate over \u03b3-Al2<\/sub>O3<\/sub> based catalysts by fast pyrolysis with ammonia (\u03b3-Al2<\/sub>O3<\/sub>\u50ac\u5316\u5feb\u901f\u70ed\u89e3\u6c28\u5316\u805a\u5bf9\u82ef\u4e8c\u7532\u9178\u4e59\u4e8c\u9187\u916fPET\u5851\u6599\u5236\u5907\u5bf9\u82ef\u4e8c\u7532\u8148)<\/p>\n

The optimal condition for producing TPN was over 1 g \u03b3-Al2<\/sub>O3<\/sub>-2wt% catalyst at 500 \u00baC under carrier gas (50% NH3 and 50% N2) with yield of nitriles and TPN of 58.1 and 52.3 C%, respectively. The selectivity of TPN in the nitriles was around 90%. Meanwhile, a bit of aromatics, benzonitrile, acetonitrile were also produced as by-products with the total yields of less than 3 C%. The catalyst deactivated slightly after 5 cycles. Possible reaction routes were proposed and it was found that terephthalic acid, benzoic acid, related esters and amides were the major intermediates from PET to nitriles. Acetonitrile could be produced from acetaldehyde and its corresponding imines. In addition, 32.1 C% TPN with high purity (> 95%) was obtained via freezing recrystallization.<\/p>\n

The carboxyl group in PET plastic was efficiently utilized for the production of terephthalonitrile and benzonitrile by controlling Ca(OH)2<\/sub>\/\u03b3-Al2<\/sub>O3<\/sub> catalysts and pyrolysis parameters (e.g. temperature, residence time, ammonia content). The best conditions are selected as 2% Ca(OH)2<\/sub>\/\u03b3-Al2<\/sub>O3<\/sub> (0.8 g), 500 \u00baC under pure ammonia with 58.3 C% terephthalonitrile yield and 92.3% selectivity in nitriles. In addition, 4% Ca(OH)2<\/sub>\/ Al2<\/sub>O3<\/sub> was suitable for producing benzonitrile. With catalyst dosage of 1.2 g, residence time of 1.87 s, pyrolysis temperature of 650 \u00baC and pure ammonia (160 mL\/min carrier gas flow rate), the yield and selectivity of benzonitrile were 30.4 C% and 82.6%, respectively.<\/p>\n

Related results were published:<\/p>\n

    \n
  1. LJ Xu, XW Na, LY Zhang, \u00a0Q Dong, GH Dong, YT Wang, Zhen Fang*<\/strong>, Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia Over Ca(OH)2<\/sub>\/Al2<\/sub>O3<\/sub> Catalysts, Catalysts<\/u>, 9<\/strong>, 436; doi:10.3390\/catal9050436\u00a0\u00a0(2019<\/strong>).<\/li>\n
  2. LJ Xu, LY Zhang, H Song, Q Dong, GH Dong, X Kong, Zhen Fang*<\/strong>, Catalytic Fast Pyrolysis of Polyethylene Terephthalate Waste Plastic for the Selective Production of Terephthalonitrile under Ammonia Atmosphere, Waste Management<\/u>, 92<\/strong>, 97\u2013106 (2019<\/strong>).<\/li>\n<\/ol>\n

    ——————————————————————————————<\/strong><\/p>\n

    \u5229\u7528\u5851\u6599\u5e9f\u5f03\u7269\u5feb\u901f\u70ed\u89e3\u5236\u5907\u542b\u6c2e\u5316\u5408\u7269<\/strong><\/p>\n

    \u6700\u8fd1\uff0c\u5f90\u7984\u6c5f\u535a\u58eb\u548c\u65b9\u771f\u6559\u6388\u5f00\u53d1\u4e86\u4e00\u79cd\u6c28\u50ac\u5316\u70ed\u89e3\u6cd5\uff0c\u5c06\u805a\u5bf9\u82ef\u4e8c\u7532\u9178\u4e59\u4e8c\u9187\u916f\uff08PET\uff09\u5851\u6599<\/strong>\u76f4\u63a5\u8f6c\u5316\u4e3a\u5bf9\u82ef\u4e8c\u7532\u8148\uff08TPN\uff09\u7b49\u542b\u6c2e\u5316\u5408\u7269\u3002<\/p>\n

    \u5728\u8f7d\u6c14\uff0850%NH3<\/sub>\u548c50%N2<\/sub>\uff09\u548c\u6e29\u5ea6500 \u2103\u4e0b\uff0c\u5236\u5907TPN\u7684\u6700\u4f73\u6761\u4ef6\u4e3a1 g \u03b3-Al2<\/sub>O3<\/sub>-2wt%\u50ac\u5316\u5242\uff0c\u8148\u7c7b\u5316\u5408\u7269\u548cTPN\u7684\u6536\u7387\u5206\u522b\u4e3a58.1%\u548c52.3%\u3002TPN\u5728\u8148\u7c7b\u4e2d\u7684\u9009\u62e9\u6027\u7ea6\u4e3a90%\u3002\u540c\u65f6\uff0c\u8fd8\u751f\u4ea7\u4e86\u5c11\u91cf\u82b3\u70c3\u3001\u82ef\u7532\u8148\u3001\u4e59\u8148\u7b49\u526f\u4ea7\u54c1\uff0c\u603b\u6536\u7387\u5c0f\u4e8e3%\u3002\u7ecf\u8fc75\u4e2a\u5faa\u73af\u540e\uff0c\u50ac\u5316\u5242\u7565\u5fae\u5931\u6d3b\u3002\u4f5c\u8005\u63d0\u51fa\u4e86\u53ef\u80fd\u7684\u53cd\u5e94\u8def\u7ebf\uff0c\u53d1\u73b0\u5bf9\u82ef\u4e8c\u7532\u9178\u3001\u82ef\u7532\u9178\u3001\u76f8\u5173\u916f\u548c\u9170\u80fa\u662f\u4ecePET\u5230\u8148\u7684\u4e3b\u8981\u4e2d\u95f4\u4f53\u3002\u4e59\u919b\u53ca\u5176\u4e9a\u80fa\u53ef\u5236\u5f97\u4e59\u8148\u3002\u6b64\u5916\uff0c\u901a\u8fc7\u51b7\u51bb\u518d\u7ed3\u6676\u5f97\u5230\u4e8632.1%\u7684\u9ad8\u7eaf\u5ea6TPN\uff08>95%\uff09\u3002<\/p>\n

    \u4f5c\u8005\u8fdb\u4e00\u6b65\u901a\u8fc7\u63a7\u5236Ca\uff08OH\uff092<\/sub>\/\u03b3-Al2<\/sub>O3<\/sub>\u50ac\u5316\u5242\u548c\u70ed\u5206\u89e3\u53c2\u6570\uff08\u5982\u6e29\u5ea6\u3001\u505c\u7559\u65f6\u95f4\u3001\u6c28\u542b\u91cf\uff09\uff0c\u6709\u6548\u5229\u7528PET\u5851\u6599\u4e2d\u7684\u7fa7\u57fa\u6765\u751f\u4ea7\u5bf9\u82ef\u4e8c\u7532\u9178\u548c\u82ef\u7532\u8148\u3002\u9009\u62e92%Ca\uff08OH\uff092<\/sub>\/\u03b3-Al2<\/sub>O3<\/sub>\uff080.8 g\uff09\uff0c\u7eaf\u6c28500 \u2103\u4e3a\u6700\u4f73\u6761\u4ef6\uff0c\u5bf9\u82ef\u4e8c\u7532\u9178\u6536\u738758.3C%\uff0c\u8148\u9009\u62e9\u602792.3%\u3002\u53e6\u5916\uff0c4%\u7684Ca\uff08OH\uff092<\/sub>\/Al2<\/sub>O3<\/sub>\u4e5f\u9002\u7528\u4e8e\u82ef\u7532\u8148\u7684\u751f\u4ea7\u3002\u50ac\u5316\u5242\u7528\u91cf1.2 g\uff0c\u505c\u7559\u65f6\u95f41.87 s\uff0c\u88c2\u89e3\u6e29\u5ea6650 \u2103\uff0c\u7eaf\u6c28\uff08160 mL\/min\u8f7d\u6c14\u6d41\u91cf\uff09\uff0c\u82ef\u7532\u8148\u7684\u6536\u7387\u548c\u9009\u62e9\u6027\u5206\u522b\u4e3a30.4c%\u548c82.6%\u3002<\/p>\n

    \u8be6\u60c5\u53ef\u89c1\uff1a<\/p>\n

      \n
    1. LJ Xu, XW Na, LY Zhang, \u00a0Q Dong, GH Dong, YT Wang, Zhen Fang*<\/strong>, Selective Production of Terephthalonitrile and Benzonitrile via Pyrolysis of Polyethylene Terephthalate (PET) with Ammonia Over Ca(OH)2<\/sub>\/Al2<\/sub>O3<\/sub> Catalysts, Catalysts<\/u>, 9<\/strong>, 436; doi:10.3390\/catal9050436\u00a0\u00a0(2019<\/strong>).<\/li>\n
    2. LJ Xu, LY Zhang, H Song, Q Dong, GH Dong, X Kong, Zhen Fang*<\/strong>, Catalytic Fast Pyrolysis of Polyethylene Terephthalate Waste Plastic for the Selective Production of Terephthalonitrile under Ammonia Atmosphere, Waste Management<\/u>, 92<\/strong>, 97\u2013106 (2019<\/strong>).<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

      Production of N-containing compounds from plastic waste […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/posts\/3696"}],"collection":[{"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/comments?post=3696"}],"version-history":[{"count":4,"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/posts\/3696\/revisions"}],"predecessor-version":[{"id":4077,"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/posts\/3696\/revisions\/4077"}],"wp:attachment":[{"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/media?parent=3696"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/categories?post=3696"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/woodrefinery.com\/zhenfang\/wp-json\/wp\/v2\/tags?post=3696"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}