麗水2-甲基四氫呋喃供應公司上海蔚云化工供應-b2b網(wǎng)站_b2b電子商務平臺【買產(chǎn)品】-上?？谄蚴称酚邢薰?/title><meta name="description" content="二甲基甲酰胺(DMF)作為重要的化工原料以及性能優(yōu)良的溶劑,主要應用于聚氨酯、腈綸、醫(yī)藥、農(nóng)藥、染料、電子等行業(yè).在聚氨酯行業(yè)中作為洗滌固化劑,主要用于濕法合成革生產(chǎn)；在醫(yī)藥行業(yè)中作為合成藥物中間體,普遍用于制取強力霉素，麗水2-甲基四氫呋"><meta name="keywords" content="麗水2-甲基四氫呋喃供應公司,2-甲基四氫呋喃"><link rel="canonical" href="http://www.cdcfah.com/"/><meta name="applicable-device" content="pc"><link rel="shortcut icon" href="/static/new_net_01/images/favicon.ico"><link rel="stylesheet" href="/static/new_net_01/css/slick.css" /><link rel="stylesheet" href="/static/new_net_01/css/addnew.css"><link rel="stylesheet" href="/static/new_net_01/css/sidenav.css"><link rel="stylesheet" href="/static/new_net_01/css/style.css" /><link rel="stylesheet" href="/static/new_net_01/css/tab.css"><link rel="stylesheet" href="/static/new_net_01/css/404.css"> <meta name="baidu-site-verification" content="OBVzrC9aaQ" /> <meta http-equiv="Cache-Control" content="no-transform" /> <meta 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class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="kjlcevh" 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)品關鍵詞：</span>麗水2-甲基四氫呋喃供應公司,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-10-27 08:26:55</p><p><span id="click" >瀏覽次數(shù)：1次</span></p><a rel="nofollow" class="button">聯(lián)系我們</a></div></div><div id="ba7fo3g" 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="3373myp" class="page-proshow02"><p class="title">詳細說明</p><div id="z372awn" class="box"><p><p style="text-indent:25px">二甲基甲酰胺(DMF)作為重要的化工原料以及性能優(yōu)良的溶劑,主要應用于聚氨酯、腈綸、醫(yī)藥、農(nóng)藥、染料、電子等行業(yè).在聚氨酯行業(yè)中作為洗滌固化劑,主要用于濕法合成革生產(chǎn)；在醫(yī)藥行業(yè)中作為合成藥物中間體,普遍用于制取強力霉素，麗水2-甲基四氫呋喃供應公司、可的松、磺胺類藥品的生產(chǎn)；在腈綸行業(yè)中作為溶劑,主要用于腈綸的干法紡絲生產(chǎn)；在農(nóng)藥行業(yè)中用于合成高效低毒農(nóng)藥殺蟲劑；在染料行業(yè)作為染料溶劑；在電子行業(yè)作為鍍錫零部件的淬火及電路板的清洗等；其它行業(yè)包括危險氣體的載體、藥品結晶用溶劑、粘合劑等。能與水、醇、醚、酯、酮，麗水2-甲基四氫呋喃供應公司、不飽和烴，麗水2-甲基四氫呋喃供應公司、芳香烴等混溶。四氫呋喃與水能混溶。麗水2-甲基四氫呋喃供應公司</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="麗水2-甲基四氫呋喃供應公司,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624027184007/8887733.png"></div><p style="text-indent:25px">甲基由一個化合物轉移到另一化合物上的酶反應：A+B-CH3→A-CH3+B。由于N5、N10-亞甲四氫葉酸的酶促還原作用生成N5-甲基四氫葉酸，由一種鈷胺酰胺酶的作用將甲基由N5-甲基四氫葉酸轉移到同型半胱氨酸上而生成甲硫氨酸。甲硫氨酸由于ATP的作用變成S-腺苷酰甲硫氨酸，此化合物被用做甲基供體生成各種甲基化合物。作為膽堿氧化形式的甜菜堿等也起甲基供體作用。甲基轉移反應不僅與含有甲基的膽堿、肌酸、腎上腺素等物質的生成有關系，而且也與***、磷脂的變化、核酸及蛋白質的甲基化也有關系，在生理上也是重要的。已知有數(shù)十種對各種化合物具特異的轉甲基酶。金屬汞和二價離子汞等無機汞在生物特別是微生物的作用下會轉化成甲基汞和二甲基汞，這種轉化稱為生物甲基化作用。這種轉化的逆過程稱為生物反甲基化作用。這兩種作用構成了微生物的汞循環(huán)山東2-甲基四氫呋喃報價多少錢四氫呋喃分子是由4個C原子、8個H原子和1個O原子組成的。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="麗水2-甲基四氫呋喃供應公司,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623894254288/5270430.png"></div><p style="text-indent:25px">聚四氫呋喃生產(chǎn)過程中分子量控制的影響因素，聚合反應工序，在這一關鍵步驟中，THF、**(ACAN)、和醋酸(HAC) 被連續(xù)加入聚合反應器中反應生成PTMEA，聚合轉化率通常約28%～30%。聚合產(chǎn)品PTMEA 的聚合分子量由**/四氫呋喃比率(ACAN/THF)與及THF 循環(huán)回路系統(tǒng)中醋酸的含量所控制。然后，通過THF 分離塔、醋酸汽提塔對PTMEA 分離提純。反應器產(chǎn)品物料中有未反應的THF、ACAN、及HAC返回至反應器循環(huán)再使用。催化劑截留其中，同時將產(chǎn)品及其反應熱移出。甲醇化處理之目的是將PTMEA 轉化為PTMEG，這一轉化是經(jīng)與甲醇反應通過酯-醇交換實現(xiàn)的。PTMEA、甲醇、和甲醇鈉被加入反應精餾塔中，產(chǎn)物PTMEG及一些殘余甲醇和甲醇鈉在反應精餾塔塔底提出，通過甲醇閃蒸塔、甲醇分離塔將甲醇分離除去。反應精餾塔塔頂物料含甲醇和醋酸甲酯，通過共沸精餾塔將醋酸甲酯和甲醇分離，醋酸甲酯回收作副產(chǎn)品出售，甲醇返回到循環(huán)甲醇貯槽。</p><p style="text-indent:25px">當以2-甲基四氫呋喃為溶劑，Ag2CO3為氧化劑，三甲基環(huán)三硼氧烷為甲基化試劑，Cp*Co(PhH)(PF6)2作為催化劑，可獲得較佳反應結果（Table 1）。對底物范圍進行了擴展。反應結果表明，藥物分子中常見的氮雜環(huán)（3a–3e）或者酰胺基團（3f–3p），均與體系兼容。一級酰胺由于缺乏導向基團，從而導致具有合成難度，但增加催化劑用量，也可以實現(xiàn)鄰位的甲基化（3k-3m）。二級苯甲酰胺（3f-3j）不論是否有立**阻或環(huán)狀，都是很好的底物。三級酰胺1n 和1o可以選擇性的單甲基化，含溴的底物3o也沒有出現(xiàn)副反應。底物3p和3z的產(chǎn)物出現(xiàn)了區(qū)域選擇性產(chǎn)物。醛和酮與含氮相比堿性更弱，少見作為C-H活化的底物，但在富電子的芳香環(huán)上，這個方法可以生成3q和3s。稠環(huán)芳香烴，可以選擇性的在1-位甲基化。然而，酯和羧酸不適用該體系。甲基化作用可在需氧或厭氧條件下進行。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="麗水2-甲基四氫呋喃供應公司,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623944439837/8611025.png"></div><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設備材質要求較高，造價昂貴，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。實驗室制備PTMEG：在反應釜中加入四氫呋喃，溫度降到-5℃以下，于強烈攪拌下滴加發(fā)煙硫酸催化劑，保持反應物料低溫，攪拌下加入定量的水，升溫至70～90℃，蒸出未反應的四氫呋喃單體，經(jīng)靜置分層、中和過渡、抽真空等工序后，制得聚四氫呋喃二醇。聚四亞甲基醚二醇，又稱聚四氫呋喃。山東2-甲基四氫呋喃報價多少錢</p><p style="text-indent:25px">儲存于陰涼、通風的庫房。麗水2-甲基四氫呋喃供應公司</p><p style="text-indent:25px">PTMEA至PTMEG轉化的結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晶析出。干燥脫水后的PTMEG 連同結晶顆粒一起被通過“板框式”壓濾機過濾系統(tǒng)，以去除其中的固體結晶顆粒。窄化處理工藝過程部分提供了對PTMEG 的之后凈化，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）分布進行之后的窄化調(diào)整。這是通過兩級工藝過程實現(xiàn)的。經(jīng)初級工藝過程的“真空脫氣”后除去水、氮氣等不凝氣，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。麗水2-甲基四氫呋喃供應公司</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55幢A2113室。公司自成立以來，以質量為發(fā)展，讓匠心彌散在每個細節(jié)，公司旗下環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺深受客戶的喜愛。公司注重以質量為中心，以服務為理念，秉持誠信為本的理念，打造化工良好品牌。上海蔚云化工立足于全國市場，依托強大的研發(fā)實力，融合前沿的技術理念，飛快響應客戶的變化需求。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1729833.html</p></div></div></div></div></div><div id="r8gyp4x" class="page-right twoColRt"><div id="lamiui8" class="box01 margin10 clearfix"><h3><a href="http://www.cdcfah.com/cp/">猜你喜歡</a></h3><div id="3ab2ctc" 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配件哪家強信息推薦自業(yè)物資供應" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></div><p>福建ZF配件哪家強信息推薦自業(yè)物資供應</p></a></div><div id="g3qmd4w" class="recomPic likePro"><a href="http://www.cdcfah.com/cp/846569.html"><div><img 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