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class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="fzheamj" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623961490638/1355180.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="cqsp874" 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-甲基四氫呋喃有哪些,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-11-01 02:20:53</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="luw74n9" 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="dczbdku" class="page-proshow02"><p class="title">詳細(xì)說(shuō)明</p><div id="zolnuby" class="box"><p><p style="text-indent:25px">試劑和儀器，試劑：所用試劑均為分析純?cè)噭?；儀器：循環(huán)水泵、電動(dòng)攪拌器、旋轉(zhuǎn)蒸發(fā)儀、反應(yīng)精餾裝置、GC-2010 Plus氣相色譜儀，GCMS-QP 2010 SE氣質(zhì)聯(lián)用儀。固體酸催化劑的制備，在三口燒瓶上裝上高速攪拌器、溫度計(jì)，加入一定量飽和氯化鈉水溶液，加入明膠、聚乙烯醇作為分散劑。開(kāi)啟攪拌，分散劑均勻分散后，稱量摩爾比為5:1的鄰氯苯乙烯和二乙烯基苯，再取定量液體石臘作為致孔劑和過(guò)氧化苯甲酰作為引發(fā)劑加入反應(yīng)器中，升溫開(kāi)始反應(yīng)，75℃保持12小時(shí)。反應(yīng)中監(jiān)控油珠分散情況，隨時(shí)調(diào)整攪拌速度以控制油珠分散度和顆粒大小，福建2-甲基四氫呋喃有哪些。反應(yīng)結(jié)束后緩慢冷卻、過(guò)濾，以熱水洗滌并烘干。用石油醚萃取致孔劑，篩分出直徑0.5~0.7mm的樹(shù)脂骨架，以二氯乙烷溶脹。溶脹完成后，在良好攪拌下加入定量濃硫酸，升溫回流并保持5小時(shí)。蒸出二氯乙烷，加入定量發(fā)煙硫酸，升溫至110℃反應(yīng)，福建2-甲基四氫呋喃有哪些。反應(yīng)過(guò)程中定時(shí)取樣，福建2-甲基四氫呋喃有哪些，測(cè)定樹(shù)脂交換量，達(dá)到預(yù)定值后結(jié)束反應(yīng)，降溫。以蒸餾水小心的洗滌樹(shù)脂至洗液中性，自然晾干。甲基化作用可在需氧或厭氧條件下進(jìn)行。福建2-甲基四氫呋喃有哪些</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建2-甲基四氫呋喃有哪些,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623961490638/1355180.png"></div><p style="text-indent:25px">甲基，化學(xué)式為-CH?，由碳和氫元素組成。甲烷分子中去掉一個(gè)氫原子后剩下的電中性的一價(jià)基團(tuán)。甲基作為一個(gè)化學(xué)基團(tuán)，它能夠結(jié)合在DNA上某些特定部位，這個(gè)甲基和DNA結(jié)合過(guò)程叫甲基化，相反，從化合物上脫落的過(guò)程叫去甲基化。甲基常出現(xiàn)在各種有機(jī)化合物中,是較常見(jiàn)的基團(tuán)。由于甲基是合成蛋氨酸、肉堿、肌酸、磷脂、腎上腺素，核糖核酸和脫氧核糖核酸等具有主要生理作用的物質(zhì)所必需的基團(tuán)，以及甲基化反應(yīng)在神經(jīng)系統(tǒng)、免疫系統(tǒng)、泌尿系統(tǒng)和心血管系統(tǒng)中所起的作用，人們認(rèn)為生長(zhǎng)期動(dòng)物和成年動(dòng)物都需要穩(wěn)定的甲基供體。一般認(rèn)為動(dòng)物體內(nèi)自身不能合成甲基，需要食物中具有富含甲基物質(zhì)，它們的分子中具有易反應(yīng)的甲基，從而參與動(dòng)物生理功能，這類(lèi)富含甲基的物質(zhì)稱為“甲基供體”,易參與此反應(yīng)的甲基,是與氮原子或硫原子連在一起的甲基，象甜菜堿、蛋氨酸、膽堿等。蘇州2-甲基四氫呋喃定做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="福建2-甲基四氫呋喃有哪些,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623991305064/1986424.png"></div><p style="text-indent:25px">2-甲基呋喃可用于溶液聚合中作溶劑使用，也可用于合成戊二烯、戊二醇、乙酰丙醇及酮類(lèi)和2-甲基四氫呋喃。在醫(yī)藥工業(yè)中，可用于合成維生素B1、磷酸氯喹和磷酸伯氨喹等。包裝類(lèi)型：180公斤鍍鋅桶，或ISO Tank,20噸/罐，也可根據(jù)客戶要求包裝。儲(chǔ)存方式：儲(chǔ)存于陰涼、干燥、通風(fēng)良好的庫(kù)房。遠(yuǎn)離火種、熱源。防止陽(yáng)光直射。包裝密封。與氧化劑、酸類(lèi)分開(kāi)存放。產(chǎn)品運(yùn)輸：運(yùn)輸過(guò)程中應(yīng)有遮蓋物，確保包裝不泄露、不倒塌、不墜落、不損壞，防止猛烈撞擊，不得與還原性物質(zhì)混運(yùn)。</p><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(shí)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(lái)，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(lèi)、苯類(lèi)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(shí)，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。甲基，化學(xué)式為-CH?，由碳和氫元素組成。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="福建2-甲基四氫呋喃有哪些,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624164107853/4550822.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(diǎn)：與水互溶性小，產(chǎn)品回收相對(duì)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(dá)一萬(wàn)多噸，同時(shí)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(fèi)用。 2-MeTHF與水的溶解性有限，通過(guò)簡(jiǎn)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(shí)現(xiàn)循環(huán)使用。甲基常出現(xiàn)在各種有機(jī)化合物中。無(wú)錫2-甲基四氫呋喃工藝</p><p style="text-indent:25px">四氫呋喃分子在常溫常壓下有較小粘稠度的有機(jī)液體。福建2-甲基四氫呋喃有哪些</p><p style="text-indent:25px">聚四氫呋喃二醇的工業(yè)化生產(chǎn)工藝根據(jù)催化劑的不同主要有氟磺酸催化聚合工藝、乙酸酐-高氯酯催化聚合工藝和雜多酸催化聚合工藝。其中氟磺酸催化工藝對(duì)設(shè)備材質(zhì)要求較高，造價(jià)昂貴，所需氟磺酸的量大。工業(yè)化的乙酸酐-高氯酸催化工藝，由THF原料經(jīng)二乙酸酯中間體制取PTMEG，副產(chǎn)物為乙酸甲酯和甲醇，生產(chǎn)成本較氟磺酸法低。開(kāi)發(fā)的雜多酸催化工藝，采用由Mo、W、V的氧化物與磷酸反應(yīng)制得多聚酸，如十二聚磷鎢酸為催化劑，一步法制得PTMEG，且催化劑為固態(tài)，可回收，是一種新工藝。實(shí)驗(yàn)室制備PTMEG：在反應(yīng)釜中加入四氫呋喃，溫度降到-5℃以下，于強(qiáng)烈攪拌下滴加發(fā)煙硫酸催化劑，保持反應(yīng)物料低溫，攪拌下加入定量的水，升溫至70～90℃，蒸出未反應(yīng)的四氫呋喃單體，經(jīng)靜置分層、中和過(guò)渡、抽真空等工序后，制得聚四氫呋喃二醇。福建2-甲基四氫呋喃有哪些</p><p style="text-indent:25px">上海蔚云化工有限公司位于靜安區(qū)靈石路709號(hào)55幢A2113室，是一家專業(yè)的化工產(chǎn)品（除危險(xiǎn)化學(xué)品、監(jiān)控化學(xué)品、煙花爆竹、民用物品、易制毒化學(xué)品）、化工機(jī)械設(shè)備及配件的銷(xiāo)售，在化工技術(shù)領(lǐng)域內(nèi)從事技術(shù)開(kāi)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(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】公司。致力于創(chuàng)造***的產(chǎn)品與服務(wù)，以誠(chéng)信、敬業(yè)、進(jìn)取為宗旨，以建巴斯夫陶氏產(chǎn)品為目標(biāo)，努力打造成為同行業(yè)中具有影響力的企業(yè)。公司堅(jiān)持以客戶為中心、化工產(chǎn)品（除危險(xiǎn)化學(xué)品、監(jiān)控化學(xué)品、煙花爆竹、民用物品、易制毒化學(xué)品）、化工機(jī)械設(shè)備及配件的銷(xiāo)售，在化工技術(shù)領(lǐng)域內(nèi)從事技術(shù)開(kāi)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(zhǔn)的項(xiàng)目，經(jīng)相關(guān)部門(mén)批準(zhǔn)后方可開(kāi)展經(jīng)營(yíng)活動(dòng)】市場(chǎng)為導(dǎo)向，重信譽(yù)，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。上海蔚云化工有限公司主營(yíng)業(yè)務(wù)涵蓋環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺，堅(jiān)持“質(zhì)量保證、良好服務(wù)、顧客滿意”的質(zhì)量方針，贏得廣大客戶的支持和信賴。</p></p><br /><p>文章來(lái)源地址: 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