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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(huì)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="pkaych2" class="twoCol"><div id="a1gh5xq" class="page-proshow clearfix"><p class="current"> 當(dāng)前位置:<a href="http://www.cdcfah.com/">首頁(yè)?<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>?福建2-甲基四氫呋喃批發(fā)廠家上海蔚云化工供應(yīng)</p><div id="a66b3zy" class="leftbox clearfix"><h1>福建2-甲基四氫呋喃批發(fā)廠家上海蔚云化工供應(yīng)</h1><div id="z0o3gzu" class="proBig"><div id="ik5ayar" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624039166387/6007011.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="qydsgf3" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624039166387/6007011.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="skkprjh" class="content"><p><span>需求數(shù)量：</span>0</p><p><span>價(jià)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>福建2-甲基四氫呋喃批發(fā)廠家,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-11-15 02:21:04</p><p><span id="click" >瀏覽次數(shù)：0次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="outgf3z" 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(hào)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="klqut2m" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="v3ra3hq" class="box"><p><p style="text-indent:25px">2-甲基四氫呋喃是一種有機(jī)化合物，分子式是C5H10O。外觀與性狀：透明,無(wú)色液體，密度：0.86 g/mL at 25 °C。熔點(diǎn)：-136 °C 凝固點(diǎn)：-136℃。沸點(diǎn)：78-80 °C，折射率：n** 1.406。儲(chǔ)存條件：庫(kù)房通風(fēng)低溫干燥，福建2-甲基四氫呋喃批發(fā)廠家,與氧化劑、酸類分開(kāi)存放。由2-甲基呋喃催化加氫而得。當(dāng)催化加氫反應(yīng)采用氯化鈀催化劑時(shí),主要的產(chǎn)品是乙酰丙醇(見(jiàn)00420),但也可回收得到副產(chǎn)品2-甲基四氫呋喃，福建2-甲基四氫呋喃批發(fā)廠家，福建2-甲基四氫呋喃批發(fā)廠家。本品主要用作樹(shù)脂、橡膠、乙基纖維素等的溶劑；用它提取脂肪族酸類，要比一般所用的低沸點(diǎn)溶劑好，在鈾的冶煉工業(yè)上也相當(dāng)重要。在制藥工業(yè)中可合成抗痔藥磷酸伯氨奎、磷酸氯喹等。2-甲基四氫呋喃可替代四氫呋喃做格氏反應(yīng)溶劑。福建2-甲基四氫呋喃批發(fā)廠家</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建2-甲基四氫呋喃批發(fā)廠家,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624039166387/6007011.png"></div><p style="text-indent:25px">在常溫下大多數(shù)聚四氫呋喃二醇是白色蠟狀固體，在40℃左右熔化成低黏度無(wú)色至淺黃色透明液體。分子量為650～2900的PTMEG閃點(diǎn)（PMCC）這197～207℃，熔點(diǎn)（凝固點(diǎn)）為11～38℃（詳細(xì)數(shù)據(jù)請(qǐng)見(jiàn)有關(guān)廠家的產(chǎn)品數(shù)據(jù)），熔化了的PTMEG可過(guò)冷，結(jié)晶緩慢。聚四氫呋喃二醇折射率（25℃）為1.464。不溶于水，在水中的溶解度小于1%，也不溶于脂肪烴，可溶于芳烴、氯化烴、醇、酯、酮等極性有機(jī)溶劑。聚四氫呋喃二醇在隔絕氧氣下貯存穩(wěn)定，例如在氮?dú)獗Ｗo(hù)下55℃以下可至少穩(wěn)定貯存1年。在100℃只能貯存數(shù)天。長(zhǎng)期接觸空氣可導(dǎo)致氧化和降解，造成色澤變黃、過(guò)氧化物含量和酸值增加，在無(wú)空氣下210～220℃發(fā)生熱降解，生成四氫呋喃，為了改善貯存穩(wěn)定性，PTMKEG工業(yè)品中一般加有微量的抗氧劑。福建2-甲基四氫呋喃批發(fā)廠家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。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建2-甲基四氫呋喃批發(fā)廠家,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png"></div><p style="text-indent:25px">四氫呋喃與水能混溶，并常含有少量水分及過(guò)氧化物。如要制得無(wú)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(guò)氧化物，然后蒸餾，收集66℃的餾分蒸餾時(shí)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(shí)，應(yīng)先用小量進(jìn)行試驗(yàn)，在確定其中只有少量水和過(guò)氧化物，作用不致過(guò)于激烈時(shí)，方可進(jìn)行純化。四氫呋喃中的過(guò)氧化物可用酸化的碘化鉀溶液來(lái)檢驗(yàn)。如過(guò)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(shí)可任意控制鋁層厚度且光亮。</p><p style="text-indent:25px">甲基效應(yīng)在藥物化學(xué)中眾所周知，然而對(duì)于藥物分子的后期修仍具有一定的挑戰(zhàn)。通過(guò)鈷催化劑，實(shí)現(xiàn)了對(duì)復(fù)雜藥物分子后期的C-H甲基化反應(yīng)。依賴于硼的甲基化試劑，同時(shí)利用分子內(nèi)在的導(dǎo)向基團(tuán)來(lái)活化C-H鍵，該反應(yīng)具有普遍的適用性。此外，該反應(yīng)無(wú)需預(yù)功能化或后脫保護(hù)，即可對(duì)各種市售藥物分子和天然產(chǎn)物進(jìn)行甲基化。同時(shí)，理化性質(zhì)和生物學(xué)測(cè)試也證實(shí)了這種看似微小的結(jié)構(gòu)變化，會(huì)影響重要的藥物特性。在藥物開(kāi)發(fā)中，后期官能團(tuán)化或后期修飾至關(guān)重要。這種策略可直接對(duì)生物活性分子進(jìn)行結(jié)構(gòu)多樣化修飾，從而避免從頭合成，并迅速獲得目標(biāo)產(chǎn)物。過(guò)渡態(tài)金屬催化的特定位置C-H活化，已實(shí)現(xiàn)在復(fù)雜分子上引入體積較小的官能團(tuán)（如氟、氰基、胺或者短鏈烷烴）。而在藥物結(jié)構(gòu)中，C-H鍵上的氫被甲基取代后，有助于提高藥物的結(jié)合親和力、生物利用度、代謝穩(wěn)定性，改變藥物的藥代動(dòng)力學(xué)，從而被藥物化學(xué)家稱為“神奇的甲基效應(yīng)”或者“魔幻的甲基效應(yīng)”。四氫呋喃并用于天然氣加味。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建2-甲基四氫呋喃批發(fā)廠家,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623894254288/5270430.png"></div><p style="text-indent:25px">工藝使用自制的陽(yáng)離子交換樹(shù)脂作為固體酸催化劑，該款樹(shù)脂熱穩(wěn)定性高，高溫使用流失少，使用壽命長(zhǎng)。反應(yīng)完成后，反應(yīng)液無(wú)催化劑殘留，后處理簡(jiǎn)單，廢水排放少，環(huán)境友好。該工藝采用了反應(yīng)精餾的方式，反應(yīng)過(guò)程中產(chǎn)生的水被及時(shí)帶出反應(yīng)體系，促進(jìn)酯化反應(yīng)平衡的右移，提高了原料的轉(zhuǎn)化率。該工藝采用了連續(xù)生產(chǎn)的方式，避免了大量的人工操作，產(chǎn)品質(zhì)量穩(wěn)定，有利于規(guī)?；a(chǎn)。以自制的固體酸催化合成TFA的工藝路線有較高的工業(yè)應(yīng)用價(jià)值，如能應(yīng)用于實(shí)踐將會(huì)產(chǎn)生良好的經(jīng)濟(jì)效益和社會(huì)效益。四氫呋喃是合成農(nóng)藥苯丁錫的中間體。臺(tái)州2-甲基四氫呋喃批發(fā)哪家好</p><p style="text-indent:25px">甲基和DNA結(jié)合過(guò)程叫甲基化。福建2-甲基四氫呋喃批發(fā)廠家</p><p style="text-indent:25px">四氫呋喃的沸點(diǎn)比較低，將其調(diào)入汽油后使汽油的餾程溫度降低。這一性質(zhì)讓生產(chǎn)超高辛烷值汽油的煉油廠獲得了很大的經(jīng)濟(jì)效益。采用四氫呋喃作為反應(yīng)溶劑，使反應(yīng)產(chǎn)物和催化劑容易分離，使3-HPA的濃度提高到35%以上。采用水萃取3-HPA，使鈷催化劑的循環(huán)使用率達(dá)99.6%，通過(guò)控制羰基化反應(yīng)中的水含量和3-HPA的濃度，使高沸點(diǎn)副產(chǎn)物很少，生成3-HPA選擇性大于90%，使該技術(shù)的工業(yè)化成為可能。產(chǎn)品運(yùn)輸：運(yùn)輸車輛應(yīng)配備相應(yīng)消防器材及泄漏應(yīng)急處理設(shè)備。嚴(yán)禁與氧化劑、食用化學(xué)品等混裝混運(yùn)。禁止使用易產(chǎn)生火花的機(jī)械設(shè)備和工具裝卸。夏季較好早晚運(yùn)輸。運(yùn)輸途中應(yīng)防暴曬、雨淋，防高溫。中途停留時(shí)應(yīng)遠(yuǎn)離火種、熱源、高溫區(qū)。鐵路運(yùn)輸時(shí)要禁止溜放。嚴(yán)禁用木船、水泥船散裝運(yùn)輸。運(yùn)輸工具上應(yīng)根據(jù)相關(guān)運(yùn)輸要求張貼危險(xiǎn)標(biāo)志、公告。福建2-甲基四氫呋喃批發(fā)廠家</p><p style="text-indent:25px">上海蔚云化工有限公司屬于化工的高新企業(yè)，技術(shù)力量雄厚。是一家私營(yíng)有限責(zé)任公司企業(yè)，隨著市場(chǎng)的發(fā)展和生產(chǎn)的需求，與多家企業(yè)合作研究，在原有產(chǎn)品的基礎(chǔ)上經(jīng)過(guò)不斷改進(jìn)，追求新型，在強(qiáng)化內(nèi)部管理，完善結(jié)構(gòu)調(diào)整的同時(shí)，良好的質(zhì)量、合理的價(jià)格、完善的服務(wù)，在業(yè)界受到寬泛好評(píng)。公司業(yè)務(wù)涵蓋環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺，價(jià)格合理，品質(zhì)有保證，深受廣大客戶的歡迎。上海蔚云化工以創(chuàng)造***產(chǎn)品及服務(wù)的理念，打造高指標(biāo)的服務(wù)，引導(dǎo)行業(yè)的發(fā)展。</p></p><br /><p>文章來(lái)源地址: http://www.cdcfah.com/cp/1993480.html</p></div></div></div></div></div><div id="3hlj7xq" class="page-right twoColRt"><div id="hs4j0ec" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="wc41tb7" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img src="http://tyunfile.71360.com/UpLoadFile/2019/11/1/14/637082168864691056_lgpj_5374157.jpg" alt="福建ZF配件哪家強(qiáng) 信息推薦自業(yè)物資供應(yīng)" class="vcenter" 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