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href="http://www.cdcfah.com/xw/"><span>行業(yè)資訊</span></a></li><li id = "index_show"><a href="http://www.cdcfah.com/zh/"><span>展會信息</span></a></li></ul></div></nav><section class="wrap clearfix"><section class="container clearfix tcPro"><section class="home-main container clearfix"><div id="v3xnja3" class="twoCol"><div id="ng3unyp" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁?<a href="http://www.cdcfah.com/cp/">產(chǎn)品供應(yīng)</a>?<a href="http://www.cdcfah.com/cp/first-_huagong/">化工</a>?<a href="http://www.cdcfah.com/cp/second-_sysqm/">實(shí)驗(yàn)室器皿</a>?<a href="http://www.cdcfah.com/cp/third-sysqm_qtsysyp/">其他實(shí)驗(yàn)室用品</a>?南京2-甲基四氫呋喃價格是多少上海蔚云化工供應(yīng)</p><div id="cqrp8en" class="leftbox clearfix"><h1>南京2-甲基四氫呋喃價格是多少上海蔚云化工供應(yīng)</h1><div id="pso8bkq" class="proBig"><div id="vea3y8r" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="ctpgcde" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="83p8xb3" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價格要求：</span>面議</p><p><span>所在地：</span>上海市</p><p><span>包裝要求：</span><span style="color: #f30;"></span></p><p><span>產(chǎn)品關(guān)鍵詞：</span>南京2-甲基四氫呋喃價格是多少,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-12-04 03:20:05</p><p><span id="click" >瀏覽次數(shù)：3次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="ehiefwn" class="rightbox"><h3>公司基本資料信息</h3><p style="border:0;"><a rel="nofollow">上海蔚云化工有限公司</a></p><p><span>聯(lián)系人：</span>盛志華</p><p><span>郵箱: </span>3273929241@qq.com</p><p><span>電話: </span>18721726651</p><p><span>傳真: </span>021_</p><p><span>網(wǎng)址: </span>http://www.weiyunhuagong.com</p><p><span>手機(jī): </span>021-52909928</p><p><span>地址: </span>靜安區(qū)靈石路709號55幢A2113室</p><p>[當(dāng)前離線] <a rel="nofollow"> [加為商友] </a><a rel="nofollow"> [發(fā)送信件] </a></p></div></div><div id="pnt7398" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="sqriefw" class="box"><p><p style="text-indent:25px">PTMEA至PTMEG轉(zhuǎn)化的結(jié)果是聚合物料中留下了催化劑甲醇鈉(NaOMe)。要去除催化劑，首先用20%硫酸鎂水溶液與PTMEG中的甲醇鈉中和，反應(yīng)生成氫氧化鎂和硫酸鈉鹽，然后PTMEG 產(chǎn)品物料通過兩級干燥過程將其中所有的氫氧化鎂和硫酸鈉鹽結(jié)晶析出。干燥脫水后的PTMEG 連同結(jié)晶顆粒一起被通過“板框式”壓濾機(jī)過濾系統(tǒng)，以去除其中的固體結(jié)晶顆粒。窄化處理工藝過程部分提供了對PTMEG 的之后凈化，南京2-甲基四氫呋喃價格是多少，南京2-甲基四氫呋喃價格是多少，并通過去除產(chǎn)品中的低分子量聚合物，對聚合物產(chǎn)品的分子量（MW）分布進(jìn)行之后的窄化調(diào)整。這是通過兩級工藝過程實(shí)現(xiàn)的，南京2-甲基四氫呋喃價格是多少。經(jīng)初級工藝過程的“真空脫氣”后除去水、氮?dú)獾炔荒龤?，聚合物產(chǎn)品被輸送到短程蒸餾來完成之后一級工藝過程，在此過程中，低分子聚合被脫除。脫氣和短程蒸餾都備有冷阱用來凝聚低分子量聚合物。2-甲基四氫呋喃可替代苯、甲苯、氯仿等溶劑。南京2-甲基四氫呋喃價格是多少</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃價格是多少,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png"></div><p style="text-indent:25px">四氫呋喃是一種重要的有機(jī)化工及精細(xì)化工原料，普遍應(yīng)用于樹脂溶劑（磁帶涂層、PVC表面涂層、清洗PVC反應(yīng)器、脫除PVC薄膜、玻璃紙涂層、塑料印刷油墨、熱塑性聚氨酯涂層）；反應(yīng)溶劑（格式試劑、烷基堿金屬化合物和芳基堿金屬化合物、氫化鋁和氫化硼、甾族化合物和大分子有機(jī)聚合物）；化學(xué)中間產(chǎn)物（聚合生成PTMEG、天然氣加味劑）；色譜溶劑（凝膠滲透色譜法）。聚四氫呋喃主要用作嵌段聚氨酯或嵌段聚醚聚酯的軟鏈段。由平均分子量為1000的聚四氫呋喃制得的嵌段聚氨酯橡膠，可用作輪胎、傳動帶、墊圈等;也可用于涂料、人造革、薄膜等。制得的嵌段聚醚聚酯為熱塑性彈性體。平均分子量為2000的聚四氫呋喃，可用以制聚氨酯彈性纖維。由聚四氫呋喃制成的嵌段聚氨酯具有良好的抗凝血性，可用作醫(yī)用高分子材料。上海2-甲基四氫呋喃哪里有賣四氫呋喃分子在常溫常壓下有較小粘稠度的有機(jī)液體。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃價格是多少,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png"></div><p style="text-indent:25px"> 鈀催化硅試劑與鹵化物的偶聯(lián) 反應(yīng) C-N鍵形成的偶聯(lián) 反應(yīng) 酮的α-芳基化反應(yīng) 鈀催化的烯丙基類化合物的反應(yīng)兩相反應(yīng)的溶劑，MeTHF是非常有效的兩相反應(yīng)溶劑，特別是在氫氧化鈉水溶液中進(jìn)行的烷基化、酰胺化和親核取代反應(yīng)。MeTHF 作為兩相反應(yīng)的溶劑，不僅反應(yīng)易進(jìn)行，而且分層界面清晰。由于MeTHF作溶劑時，產(chǎn)品分離回收更方便，因而常用作還原胺化和胺的酰化反應(yīng)溶劑。極易揮發(fā)，通常都有大量損失；致ai物質(zhì)；鹵代烷是嚴(yán)格受限制的化學(xué)品。 4.5 2-MeTHF－鹵代烷的優(yōu)良替代品鹵代烷的缺點(diǎn)： 2-MeTHF相對于CH2Cl2的優(yōu)越性與水微溶，回收方便；對溶解在DCM中的極性化合物具有很強(qiáng)的溶解性。</p><p style="text-indent:25px">四氫呋喃與水能混溶，并常含有少量水分及過氧化物。如要制得無水四氫呋喃，可用氫化鋁鋰在隔絕潮氣下回流（通常1000mL約需2~4g氫化鋁鋰）除去其中的水和過氧化物，然后蒸餾，收集66℃的餾分蒸餾時不要蒸干，將剩余少量殘液即倒出Chemicalbook）。精制后的液體加入鈉絲并應(yīng)在氮?dú)夥罩斜４?。處理四氫呋喃時，應(yīng)先用小量進(jìn)行試驗(yàn)，在確定其中只有少量水和過氧化物，作用不致過于激烈時，方可進(jìn)行純化。四氫呋喃中的過氧化物可用酸化的碘化鉀溶液來檢驗(yàn)。如過氧化物較多，應(yīng)另行處理為宜。HF是一種重要的有機(jī)合成原料且是性能優(yōu)良的溶劑，特別適用于溶解PVC、聚偏氯乙烯和丁苯胺，普遍用作表面涂料、防腐涂料、印刷油墨、磁帶和薄膜涂料的溶劑，并用作反應(yīng)溶劑，用于電鍍鋁液時可任意控制鋁層厚度且光亮。2-甲基四氫呋喃是用于合成藥物磷酸氯喹和磷酸伯氨喹的主要原料。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃價格是多少,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623991305064/1986424.png"></div><p style="text-indent:25px">2-甲基呋喃由鎳催化在150℃下進(jìn)行加氫反應(yīng)即得粗品。經(jīng)脫水、精餾制得成品。另外，在生產(chǎn)乙酰正丙醇時可副產(chǎn)2一甲基四氫呋喃。2-甲基四氫呋喃作為一種環(huán)醚，也是一種路易斯堿，更是一種環(huán)境友好、性能優(yōu)良的獨(dú)特的溶劑。近幾年來，由于2-甲基四氫呋喃優(yōu)良的性能和環(huán)境友好的特點(diǎn)，使其在溶劑替代應(yīng)用領(lǐng)域得以迅速的的發(fā)展：用于替代安全隱患大的四氫呋喃、**等，用作格氏反應(yīng)溶劑；用于替代高毒性的鹵代烴類、苯類等作為有機(jī)合成的反應(yīng)溶劑或萃取溶劑；應(yīng)用于有機(jī)金屬反應(yīng)和兩相反應(yīng)的溶劑。14KPa下，以MeCO(CH2)nCH2Cl為原料與Bu3SnH反應(yīng)得到環(huán)醚，且產(chǎn)率與環(huán)的大小有關(guān)。當(dāng)n＝2時，所得2-甲基四氫呋喃的產(chǎn)率為98％。將RCH2CH2OCHR’CH2R(R＝Br，Cl；R’＝H，Me)在極性溶劑中用鋅粉、鉀汞齊或鋰汞齊的作用下發(fā)生分子內(nèi)偶聯(lián)反應(yīng)得2-甲基四氫呋喃。利用水溶液Cu(II)堿金屬氯化物催化氧化1，3-戊二烯得到2-甲基四氫呋喃。四氫呋喃是制藥行業(yè)的主要溶屬劑。南京2-甲基四氫呋喃價格是多少</p><p style="text-indent:25px">四氫呋喃是合成農(nóng)藥苯丁錫的中間體。南京2-甲基四氫呋喃價格是多少</p><p style="text-indent:25px">5-二取代的四氫呋喃類混合物的制備方法，包括：在多相醚化催化劑、多相氫化催化劑和氫氣存在的條件下，將5-羥甲基糠醛或5-羥甲基糠醛的水溶液與醇混合后發(fā)生醚化還原反應(yīng)得到的液態(tài)中間產(chǎn)物；然后再在第二催化劑的作用下，使得到的液態(tài)中間產(chǎn)物發(fā)生加氫反應(yīng)，得到2，5-二取代的四氫呋喃類混合物。該制備方法通過兩步法實(shí)現(xiàn)5-羥甲基糠醛向目標(biāo)產(chǎn)物的轉(zhuǎn)化，得到的2，5-二取代的四氫呋喃類混合物可作為潛在的燃料或者燃料添加劑。含有四氫呋喃的藥物共有13個。這些藥物涵蓋心血管疾病，傳染病，泌尿系統(tǒng)疾病，ai癥和糖尿病等多種***領(lǐng)域。這些藥物中的四氫呋喃都含有手性中心，其中特拉唑嗪和阿夫唑嗪為外消旋體。另外，有4種藥物含有兩個四氫呋喃環(huán)，包括地瑞那韋、異山梨醇二硝酸酯、異山梨醇單硝酸酯。天然產(chǎn)物包括伊維菌素、依前列醇及軟海綿素B的合成類似物艾日布林。泊沙康唑含有一個季碳手性中心，其抗***效果優(yōu)于早期的酮康唑等抗***藥，它對曲霉菌以及對先前的抗***藥具有抗性的其它******均有效。南京2-甲基四氫呋喃價格是多少</p><p style="text-indent:25px">上海蔚云化工有限公司致力于化工，是一家貿(mào)易型公司。公司業(yè)務(wù)分為環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺等，目前不斷進(jìn)行創(chuàng)新和服務(wù)改進(jìn)，為客戶提供良好的產(chǎn)品和服務(wù)。公司注重以質(zhì)量為中心，以服務(wù)為理念，秉持誠信為本的理念，打造化工良好品牌。上海蔚云化工憑借創(chuàng)新的產(chǎn)品、專業(yè)的服務(wù)、眾多的成功案例積累起來的聲譽(yù)和口碑，讓企業(yè)發(fā)展再上新高。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2256551.html</p></div></div></div></div></div><div id="wamvwn3" 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