聚丙烯酰胺的酰胺基 - 河南錦仙河環?？萍加邢薰?/title> <meta name="keywords" content=" 聚丙烯酰胺的酰胺基"> <meta name="description" content=" 聚丙烯酰胺的酰胺基，聚丙烯酰胺為白色粉末或小顆粒狀物質，密度為1.302g/cm3（23℃），玻璃化轉變溫度為153℃，軟化溫度為210℃[1]。一般的干燥方法都含有少量水分。它會迅速吸收環境中的水分。冷凍干燥分離的均聚物為白色柔軟的無定形固體，但從溶液中析出并干燥后，變成玻璃狀的部分透明固體，完全干燥。丙烯酰胺 PAM 是一種易碎的白色固體。商用聚丙烯酰胺通常在中等條件下干燥，一般含水量為 5% 至 15%。澆鑄在玻璃板上制成的聚合物薄膜透明、堅硬、透明。易碎固體。 "> <meta http-equiv="Cache-Control" content="no-transform" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <meta name="location" content="province=;city="> <meta http-equiv="X-UA-Compatible" content="IE=edge,Chrome=1" /> <meta name="renderer" content="webkit"> <meta http-equiv="X-UA-Compatible" content="IE=9" /> <link href="http://image.seohost.cn/storage/3216/images/20180329/20180329225820_49109.png" rel="shortcut icon" > <link rel="stylesheet" type="text/css" href="http://image.seohost.cn/storage/3216/tpl/my_25/css/bootstrap.css"/> <link rel="stylesheet" type="text/css" 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2021-08-28 00:00 瀏覽量 : 31<div class="bdsharebuttonbox bdsharebuttonboxz" style="width: 18%; margin: 0px auto;"><a href="#" class="bds_more" data-cmd="more"></a><a href="#" class="bds_qzone" data-cmd="qzone" title="分享到QQ空間"></a><a href="#" class="bds_tsina" data-cmd="tsina" title="分享到新浪微博"></a><a href="#" class="bds_tqq" data-cmd="tqq" title="分享到騰訊微博"></a><a href="#" class="bds_renren" data-cmd="renren" title="分享到人人網"></a><a href="#" class="bds_weixin" data-cmd="weixin" title="分享到微信"></a></div> <script>window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"1","bdSize":"16"},"share":{},"image":{"viewList":["qzone","tsina","tqq","renren","weixin"],"viewText":"分享到：","viewSize":"16"},"selectShare":{"bdContainerClass":null,"bdSelectMiniList":["qzone","tsina","tqq","renren","weixin"]}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script> </dt><dd class="more_img" style="overflow: hidden;"> <p><br/> 聚丙烯酰胺的酰胺基，聚丙烯酰胺為白色粉末或小顆粒狀物質，密度為1.302g/cm3（23℃），玻璃化轉變溫度為153℃，軟化溫度為210℃[1]。一般的干燥方法都含有少量水分。它會迅速吸收環境中的水分。冷凍干燥分離的均聚物為白色柔軟的無定形固體，但從溶液中析出并干燥后，變成玻璃狀的部分透明固體，完全干燥。丙烯酰胺 PAM 是一種易碎的白色固體。商用聚丙烯酰胺通常在中等條件下干燥，一般含水量為 5% 至 15%。澆鑄在玻璃板上制成的聚合物薄膜透明、堅硬、透明。易碎固體。 <br/>在缺氧條件下，加熱到210℃會因失水而失重；繼續加熱至210~300℃時，酰胺基分解生成氨和水；當溫度升至500℃時，僅形成原重量40%的黑色薄片。<br/>制備方法<br/>聚丙烯酰胺的生產有兩個步驟：<br/>單體生產工藝：丙烯酰胺單體的生產以丙烯腈為原料，在催化劑作用下水合形成丙烯酰胺單體粗品，經閃蒸、精制后得到精制丙烯酰胺單體，即聚丙烯酰胺生產原料。<br/>丙烯腈+（水催化劑/水）→組合→粗丙烯酰胺→閃蒸→精制→精制丙烯酰胺。<br/>根據催化劑的發展歷史，單體技術經歷了三代：<br/>第一代是硫酸催化水化技術。該技術的缺點是丙烯腈轉化率低，丙烯酰胺產品收率低，副產物少，給精煉帶來很大的負擔。另外，由于催化劑硫酸腐蝕性強，設備成本高，增加了生產成本。第二代是二元或三元骨架銅催化生產技術。該技術的缺點是最終產品中引入了影響聚合的金屬銅離子，從而增加了后處理和精煉的成本；第三代是微生物腈水合酶催化生產技術，該技術反應條件溫和，常溫常壓下進行，選擇性高，收率高，具有高效、高活性的特點，丙烯腈的轉化率可達到100%，反應完全，無副產物和雜質。產品丙烯酰胺不含金屬銅離子，無需離子交換去除生產過程中產生的銅離子，簡化了工藝流程。此外，氣相色譜分析表明丙烯酰胺產品幾乎不含游離丙烯腈。純度高，特別適用于制備食品工業所需的超高分子量聚丙烯酰胺和無毒聚丙烯酰胺。<br/> <br/> 聚丙烯酰胺的酰胺基，微生物催化丙烯酰胺單體生產技術。首先，日本在1985年建立了6000t/a丙烯酰胺裝置，后來俄羅斯也掌握了這項技術。 1990年代，日本和俄羅斯先后建立了萬噸級微生物催化丙烯酰胺裝置。我國是繼日本和俄羅斯之后世界上第三個擁有這項技術的國家。微生物催化劑的活性為2857個國際生化單位，達到國際水平。我國微生物催化丙烯酰胺單體生產技術是上海農藥研究所通過“七五”、“八五”、“九五”等三個五年計劃開發的.微生物催化劑腈水合酶選于1990年，是用從泰山腳下土壤中分離得到的163株和從泰山腳下土壤中分離得到的145株進行種子培養得到的腈水合酶。代碼是 Norcardia-163?，F在的技術先后在江西如皋、南昌、勝利油田、河北萬全等地投產。質量高，達到生產超高分子量聚丙烯酰胺的質量指標。標志著我國微生物催化丙烯酰胺技術達到國際先進水平。</p> </dd> </dl> 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