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01:19:59</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="cwt8hf8" 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: </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="u2a7fcu" class="page-proshow02"><p class="title">詳細說明</p><div id="imebdpm" class="box"><p><p style="text-indent:25px">使用注意事項：呼吸系統(tǒng)防護：可能接觸其蒸氣時，應(yīng)該佩戴過濾式防毒面具(半面罩)。必要時，建議佩戴自給式呼吸器眼睛防護：一般不需要特殊防護，高濃度接觸時可戴安全防護眼鏡。身體防護：穿防靜電工作服。手防護：戴防苯耐油手套。其它：工作現(xiàn)場嚴禁吸煙。工作畢，淋浴更衣。注意個人清潔衛(wèi)生。應(yīng)急處置：皮膚接觸：脫去被污染的衣著，用肥皂水和清水徹底沖洗皮膚。眼睛接觸：提起眼瞼，用流動清水或生理鹽水沖洗。就醫(yī)。吸入：迅速脫離現(xiàn)場至空氣新鮮處。保持呼吸道通暢。如呼吸困難，給輸氧。如呼吸停止，立即進行人工呼吸。就醫(yī)。食入：飲足量溫水，催吐，就醫(yī)。滅火方法：噴水冷卻容器，可能的話將容器從火場移至空曠處。處在火場中的容器若已變色或從安全泄壓裝置中產(chǎn)生聲音，必須馬上撤離。滅火劑：泡沫、干粉，嘉興2-甲基四氫呋喃哪家比較便宜、二氧化碳、砂土。用水滅火無效，嘉興2-甲基四氫呋喃哪家比較便宜。小量泄漏：用砂土或其它不燃材料吸附或吸收。也可以用大量水沖洗，洗水稀釋后放入廢水系統(tǒng)。大量泄漏：構(gòu)筑圍堤或挖坑收容，嘉興2-甲基四氫呋喃哪家比較便宜。用泡沫覆蓋，降低蒸氣災(zāi)害。噴霧狀水冷卻和稀釋蒸汽、保護現(xiàn)場人員、把泄漏物稀釋成不燃物。用防爆泵轉(zhuǎn)移至槽車或**收集器內(nèi)，回收或運至廢物處理場所處置。四氫呋喃是芳香族化合物呋喃的完全氫化產(chǎn)物。嘉興2-甲基四氫呋喃哪家比較便宜</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="嘉興2-甲基四氫呋喃哪家比較便宜,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png"></div><p style="text-indent:25px">呋喃是很好的富電芳香雜環(huán)，可與金屬形成金屬有機化合物參與反應(yīng)，可發(fā)生[2+2]光反應(yīng)、[2+3]環(huán)加成、[4+3]環(huán)加成和Diels-Alder反應(yīng)，也可以發(fā)生卡賓反應(yīng)。2-鹵代、酰基、氰基、磺?；汪驶秽暮铣?呋喃作為富電的芳香雜環(huán)可以與很多的親電試劑發(fā)生反應(yīng)，用以制備鹵代呋喃、?；秽?、氰代呋喃和其它雜原子取代呋喃等產(chǎn)物 (式1)。一般情況下C-2位比C-3位更容易受親電試劑的進攻。烷基呋喃的合成烷基呋喃可由呋喃經(jīng)過親電取代反應(yīng)制得。呋喃發(fā)生Mannich反應(yīng)可生成2-(N,N-二烷基氨基)甲基呋喃衍生物，TMSI存在下呋喃也可以與β-酮發(fā)生反應(yīng)。而在Ag+催化下，1,3-二苯基硒丙烷 (式2) 或者氯代環(huán)丙烷可與呋喃發(fā)生烯丙基化。嘉興2-甲基四氫呋喃哪家比較便宜四氫呋喃是一種常用的中等極性非質(zhì)子性溶劑。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="嘉興2-甲基四氫呋喃哪家比較便宜,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624039166387/6007011.png"></div><p style="text-indent:25px">2-甲基四氫呋喃與其它溶劑相比，MeTHF用作格氏反應(yīng)溶劑具有如下優(yōu)點：與水互溶性小，產(chǎn)品回收相對比較容易；與THF相比，易于脫水，回收利用方便、成本低；與THF相比，分層界面清晰；特別適用于制備高濃度的溴格氏試劑溶液；獲得高收率的芐基或烯丙基格氏試劑；可在較高溫度下反應(yīng)，且溶劑損耗小。在制藥工業(yè)上的應(yīng)用在化妝品工業(yè)上的應(yīng)用在農(nóng)藥領(lǐng)域的應(yīng)用。芳樟醇/香酮是香水香精、家化產(chǎn)品香精及皂用香精配方中使用頻率較高的香料品種，現(xiàn)在全世界的年用量達一萬多噸，同時也是合成異植物醇、VE、VK的原料。 THF與水互溶，回收低水份的THF，需要特殊的設(shè)備和較高的能耗費用。 2-MeTHF與水的溶解性有限，通過簡單的間歇共沸脫水精餾操作，就可以回收水份低于300ppm的2-MeTHF，實現(xiàn)循環(huán)使用。</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)在氮氣氛中保存。處理四氫呋喃時，應(yīng)先用小量進行試驗，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。如過氧化物較多，應(yīng)另行處理為宜。HF是一種重要的有機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。甲基呋喃可用于溶液聚合中作溶劑使用。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="嘉興2-甲基四氫呋喃哪家比較便宜,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624283199578/5832986.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?；磻?yīng)溶劑。極易揮發(fā)，通常都有大量損失；致ai物質(zhì)；鹵代烷是嚴格受限制的化學品。 4.5 2-MeTHF－鹵代烷的優(yōu)良替代品鹵代烷的缺點： 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的溶解性。2-甲基四氫呋喃可替代四氫呋喃做格氏反應(yīng)溶劑。溫州2-甲基四氫呋喃廠家直銷</p><p style="text-indent:25px">四氫呋喃也是生產(chǎn)聚四亞甲基醚二醇重要原料。嘉興2-甲基四氫呋喃哪家比較便宜</p><p style="text-indent:25px"> 在堿性條件下非常穩(wěn)定、大多數(shù)酸性條件下也穩(wěn)定；與水分層界面非常清晰；與水分層，水在下層；而DCM與水分層，水在上層；用MeTHF作溶劑，產(chǎn)品可在釜內(nèi)脫水，因為MeTHF與水形成特殊的共沸物； MeTHF的沸點為80℃，回流冷凝器可用水作為冷卻介質(zhì)。 MeTHF的優(yōu)點：頭孢類藥物頭孢克肟的生產(chǎn) 頭孢克肟，抗藥拉西地平的生產(chǎn) 拉西地平 2-甲基四氫呋喃回收容易 2-甲基四氫呋喃在工業(yè)化生產(chǎn)中的優(yōu)勢：綜合成本低， 2-甲基四氫呋喃在工業(yè)化生產(chǎn)中的優(yōu)勢，環(huán)境影響小，2-甲基四氫呋喃在工業(yè)化生產(chǎn)中的優(yōu)勢， 2-甲基四氫呋喃能提高加成產(chǎn)物的收率，而THF常常導(dǎo)致還原產(chǎn)物增加而使加成產(chǎn)物的產(chǎn)率降低。嘉興2-甲基四氫呋喃哪家比較便宜</p><p style="text-indent:25px">上海蔚云化工有限公司致力于化工，以科技創(chuàng)新實現(xiàn)***管理的追求。上海蔚云化工作為化工產(chǎn)品（除危險化學品、監(jiān)控化學品、煙花爆竹、民用物品、易制毒化學品）、化工機械設(shè)備及配件的銷售，在化工技術(shù)領(lǐng)域內(nèi)從事技術(shù)開發(fā)、技術(shù)轉(zhuǎn)讓、技術(shù)服務(wù)、技術(shù)咨詢。【依法須經(jīng)批準的項目，經(jīng)相關(guān)部門批準后方可開展經(jīng)營活動】的企業(yè)之一，為客戶提供良好的環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺。上海蔚云化工始終以本分踏實的精神和必勝的信念，影響并帶動團隊取得成功。上海蔚云化工創(chuàng)始人盛志華，始終關(guān)注客戶，創(chuàng)新科技，竭誠為客戶提供良好的服務(wù)。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/2267734.html</p></div></div></div></div></div><div id="was3o3w" class="page-right twoColRt"><div id="8frt72h" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="jta3q3t" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/814588.html"><div><img 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