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clearfix"><h1>南京2-甲基四氫呋喃廠家供應(yīng) 上海蔚云化工供應(yīng)</h1><div id="pwdkmdf" class="proBig"><div id="c2saxel" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623944439837/8611025.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="8sprjli" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623944439837/8611025.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="qcegdpm" 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-甲基四氫呋喃廠家供應(yīng),2-甲基四氫呋喃</p><p><span>***更新：</span>2020-11-11 03:22:27</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="ujgiprt" 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="8gd73wv" class="page-proshow02"><p class="title">詳細說明</p><div id="baixikm" class="box"><p><p style="text-indent:25px">四氫-2-甲基呋喃;喃;;2-甲基四喃;2-甲基四氫呋喃(METHF);A-甲基四氫呋喃;2-甲基四氫呋喃,大約150-400PPMBHT作為穩(wěn)定劑，C5H10O分子量：86.13安全術(shù)語遠離火源，南京2-甲基四氫呋喃廠家供應(yīng)。不慎與眼睛接觸后，預防靜電發(fā)生?？赡苌尚赃^氧化物。刺激眼睛和呼吸系統(tǒng)?？扇夹晕ｋU特性：遇明火、高溫、氧化劑易燃;燃燒產(chǎn)生刺激煙霧滅火劑：干粉、干砂、二氧化碳、泡沫、1211滅火劑2一甲基四氫呋喃有毒嗎屬于危險品毒性分級：中毒急性毒性：4500 毫克/公斤可燃性危險特性：遇明火、高溫、氧化劑易燃;燃燒產(chǎn)生刺激煙霧物危險特性：其蒸氣與空氣可形成性混合物，南京2-甲基四氫呋喃廠家供應(yīng),遇明火，南京2-甲基四氫呋喃廠家供應(yīng)、高熱極易燃燒。四氫呋喃用作溶劑、有機合成的原料。南京2-甲基四氫呋喃廠家供應(yīng)</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃廠家供應(yīng),2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623944439837/8611025.png"></div><p style="text-indent:25px">與游離基的反應(yīng) 呋喃可以和親電的碳游離基反應(yīng)得到2-烷基取代的呋喃。在Pd催化下，帶有吸電子基團的溴化物與可以呋喃直接偶合。有機金屬化合物呋喃鋰鹽在有機合成中普遍使用。金屬取代的呋喃可以與很多的親電試劑發(fā)生反應(yīng)，而且2-鋰代呋喃也可以發(fā)生金屬的轉(zhuǎn)移反應(yīng)。2-取代呋喃的高價銅酸鹽可以在低溫下與酮發(fā)生共軛加成反應(yīng)。烯的環(huán)加成光照下羰基化合物與呋喃[2+2]環(huán)加成生成環(huán)醚后，用酸處理可得到3-取代呋喃。呋喃與氰氧化物會發(fā)生[2+3]環(huán)加成，可用來合成多羥基胺類化合物。二烯的環(huán)加成呋喃以二烯的形式參與Diels-Alder反應(yīng)是呋喃在有機合成中較普遍的應(yīng)用，提供了很多碳碳鍵的形成方法并可用于后續(xù)的合成。但是由于呋喃本身的芳香性，Diels-Alder反應(yīng)速度都很慢。呋喃不僅能與丙二烯化合物發(fā)生Diels-Alder反應(yīng)得到選擇性的產(chǎn)物，而且還能和乙炔類化合物反應(yīng)。呋喃和不同芳香烯的反應(yīng)是合成多烯化合物的一種很好方法。揚州2-甲基四氫呋喃哪里便宜四氫呋喃與水能混溶。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃廠家供應(yīng),2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png"></div><p style="text-indent:25px">THF自身可縮聚（經(jīng)陽離子引發(fā)開環(huán)再聚合）成聚四亞甲基醚二醇（PTMEG），也稱四氫呋喃均聚醚。PTMEG與甲苯二異氰酸酯（TDI）制成耐磨、耐油、低溫性能好、強度高的特種橡膠；與對苯二甲酸二甲酯和1,4-丁二醇制成嵌段聚醚聚酯彈性Chemicalbook材料。相對分子質(zhì)量為2000的PTMEG與對亞甲基雙（4-苯基）二異氰酸酯（MDI）制成聚氨酯彈性纖維（氨綸，即SPANDEX纖維）、特種橡膠和一些特殊用途涂料的原料。在有機合成方面，用于生產(chǎn)四氫噻吩、1.4-二氯乙烷、2.3-二氯四氫呋喃、戊內(nèi)酯、丁內(nèi)酯和吡咯烷酮等。在醫(yī)藥工業(yè)方面，THF用于合成咳必清、利復霉素、黃體酮和一些藥。THF經(jīng)硫化氫處理生成四氫硫酚，可作燃料氣中的臭味劑（識別添加劑）。THF還可用做合成革的表面處理劑。</p><p style="text-indent:25px">呋喃類藥是一類化學合成藥。能作用于細菌的酶系統(tǒng)，干擾細菌的糖代謝而有抑菌作用。使用的呋喃類藥物有10余種，較常用的有呋喃妥因、呋喃唑酮、呋喃西林等，臨床上因呋喃西林易引起多發(fā)性神經(jīng)炎，故只供外用。呋喃妥因（呋喃啶）***范圍較廣，對多種革蘭氏陽、陰性細菌均有控制作用，但對綠膿桿菌無效。吸收后由尿排泄，常用于***泌尿系***。細菌對本品不易產(chǎn)生耐藥性?？煽诜盟?。注意：腎功能不全者慎用。過敏反應(yīng)可致胸悶、氣喘等。可發(fā)生周圍神經(jīng)炎，表現(xiàn)為手足麻木及肌萎縮。中毒性精神癥狀則為幻視、幻聽等。胃腸道反應(yīng)、溶血性貧血及肺部并發(fā)癥也能發(fā)生。呋喃唑酮（痢特靈）***譜和呋喃啶相似，對消化道的多種細菌有控制作用，也可控制滴蟲?？诜蛰^少，主要在腸道起作用，主治腸炎、痢疾和傷寒等。對幽門螺旋菌有控制作用，故可用于***潰瘍病?？煽诜盟?。注意：常見胃腸反應(yīng)；常有遲發(fā)性皮疹、等反應(yīng)；也可發(fā)生肺浸潤、***、直立性低血壓、低血糖等反應(yīng)。本品可引起多發(fā)性神經(jīng)炎，每日量超過0.4克或總量超過3克時較易發(fā)生，癥狀可遷延至數(shù)月或一年以上，故應(yīng)密切控制用量。新生兒或先天缺少血球保護酶者可致溶血性貧血。相反從化合物上脫落的過程叫去甲基化。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃廠家供應(yīng),2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623894254288/5270430.png"></div><p style="text-indent:25px">順酐催化加氫法：順酐和氫氣從底部進入內(nèi)裝鎳催化劑的反應(yīng)器，產(chǎn)物中四氫呋喃與γ-丁內(nèi)酯比例可通過調(diào)整操作參數(shù)加以控制。反應(yīng)產(chǎn)物與原料氫氣冷卻至50℃左右進入洗滌塔底部，使未反應(yīng)的氫氣及氣態(tài)與液態(tài)產(chǎn)物分離，未反應(yīng)的氫氣及氣態(tài)產(chǎn)物經(jīng)洗滌后循環(huán)到反應(yīng)器，液態(tài)產(chǎn)物經(jīng)蒸餾而得四氫呋喃產(chǎn)品。該工藝可在0～(5∶1)范圍內(nèi)任意調(diào)整γ-丁內(nèi)酯與四氫呋喃的比例，順酐的單程轉(zhuǎn)化率達99.9%，四氫呋喃選擇性為85%～95%，產(chǎn)品含量達99.97%。該工藝具有催化劑性能好、流程簡單、投資少等特點。4-丁二醇脫水環(huán)化法：其工藝過程為：向反應(yīng)器中加入1087kg 22%的硫酸水溶液，在100℃以110kg/h的速度加入1，4-丁二醇，塔頂溫度維持在80℃，以大約110kg/h的速度從塔頂?shù)玫胶?0%四氫呋喃的水溶液。加入50t 1，4-丁二醇后，從反應(yīng)器中排除約70kg焦質(zhì)。將焦質(zhì)進行過濾，得到的硫酸水溶液可以重新使用，這一過程的四氫呋喃收率可以達到99%以上。硫酸是四氫呋喃工業(yè)生產(chǎn)中使用較早的催化劑，也是現(xiàn)今生產(chǎn)中應(yīng)用較多的催化劑。此工藝技術(shù)成熟，工藝比較簡單，反應(yīng)溫度較低，四氫呋喃收率較高，但硫酸易腐蝕設(shè)備，污染環(huán)境。甲基化作用可在需氧或厭氧條件下進行。南通2-甲基四氫呋喃批發(fā)便宜嗎</p><p style="text-indent:25px">四氫呋喃并用于天然氣加味。南京2-甲基四氫呋喃廠家供應(yīng)</p><p style="text-indent:25px">甲基化作用可在需氧或厭氧條件下進行，其轉(zhuǎn)化機理主要有酶促反應(yīng)和非酶促反應(yīng)兩種。非酶促反應(yīng)機理依據(jù)厭氧菌甲烷形成菌合成的甲基鈷氨素作為甲基供體,在有三磷酸腺苷(ATP)和中等還原劑的條件下把無機汞轉(zhuǎn)化成甲基汞或二甲基汞，與此同時甲基鈷氨素轉(zhuǎn)化成羥基鈷氨素。甲基化的酶促反應(yīng)是由微生物直接參與進行的。細菌利用培養(yǎng)基中豐富的維生素，在細胞內(nèi)產(chǎn)生轉(zhuǎn)甲基酶，促使甲基轉(zhuǎn)移，但酶的種類還不清楚。從底泥、土壤和魚的內(nèi)臟、魚鰓中發(fā)現(xiàn)，能使汞甲基化的微生物種類很多，厭氧菌中有匙形梭狀芽孢桿菌,需氧菌中有熒光極毛桿菌草分枝桿菌大腸桿菌等甲基化速度取決于酶的活性，并與營養(yǎng)環(huán)境以及半胱氨酸和維生素B等因素有關(guān)。厭氧條件下硫化物的存在往往會控制汞甲基化的進行。南京2-甲基四氫呋喃廠家供應(yīng)</p><p style="text-indent:25px">上海蔚云化工有限公司擁有化工產(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?！疽婪毥?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】等多項業(yè)務(wù)，主營業(yè)務(wù)涵蓋環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺。一批專業(yè)的技術(shù)團隊，是實現(xiàn)企業(yè)戰(zhàn)略目標的基礎(chǔ)，是企業(yè)持續(xù)發(fā)展的動力。公司業(yè)務(wù)范圍主要包括：環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺等。公司奉行顧客至上、質(zhì)量為本的經(jīng)營宗旨，深受客戶好評。一直以來公司堅持以客戶為中心、環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺市場為導向，重信譽，保質(zhì)量，想客戶之所想，急用戶之所急，全力以赴滿足客戶的一切需要。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1938106.html</p></div></div></div></div></div><div id="lanfcoq" class="page-right twoColRt"><div id="cmj7g2w" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="dnkhoqs" 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" 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