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clearfix"><h1>南京2-甲基四氫呋喃直銷公司有哪些上海蔚云化工供應(yīng)</h1><div id="uo77vq2" class="proBig"><div id="auw3a7v" class="bigimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624164107853/4550822.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div><div id="utkro8o" class="smallimg"><div><p class="pic"><img src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624164107853/4550822.png" class="vcenter" onerror="javascript:this.src='/static/new_net_01/images/nopic.jpg';"></p></div></div></div><div id="hbyqxzb" 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-甲基四氫呋喃直銷公司有哪些,2-甲基四氫呋喃</p><p><span>***更新：</span>2020-10-23 09:28:09</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="aj87b4v" 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="wg2hwcz" class="page-proshow02"><p class="title">詳細(xì)說明</p><div id="isda2mj" class="box"><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設(shè)備材質(zhì)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(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。實驗室制備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℃，南京2-甲基四氫呋喃直銷公司有哪些，南京2-甲基四氫呋喃直銷公司有哪些，蒸出未反應(yīng)的四氫呋喃單體，南京2-甲基四氫呋喃直銷公司有哪些，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。四氫呋喃可以通過氫氧化鈉置于密封瓶中在暗處保存。南京2-甲基四氫呋喃直銷公司有哪些</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃直銷公司有哪些,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624164107853/4550822.png"></div><p style="text-indent:25px">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(yīng)工序，在這一關(guān)鍵步驟中，THF、**(ACAN)、和醋酸(HAC) 被連續(xù)加入聚合反應(yīng)器中反應(yīng)生成PTMEA，聚合轉(zhuǎn)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(yīng)器產(chǎn)品物料中有未反應(yīng)的THF、ACAN、及HAC返回至反應(yīng)器循環(huán)再使用。催化劑截留其中，同時將產(chǎn)品及其反應(yīng)熱移出。甲醇化處理之目的是將PTMEA 轉(zhuǎn)化為PTMEG，這一轉(zhuǎn)化是經(jīng)與甲醇反應(yīng)通過酯-醇交換實現(xiàn)的。PTMEA、甲醇、和甲醇鈉被加入反應(yīng)精餾塔中，產(chǎn)物PTMEG及一些殘余甲醇和甲醇鈉在反應(yīng)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(yīng)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。福建2-甲基四氫呋喃工廠四氫呋喃也是生產(chǎn)聚四亞甲基醚二醇重要原料。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃直銷公司有哪些,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389623884264046/3770351.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)請見有關(guān)廠家的產(chǎn)品數(shù)據(jù)），熔化了的PTMEG可過冷，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。長期接觸空氣可導(dǎo)致氧化和降解，造成色澤變黃、過氧化物含量和酸值增加，在無空氣下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。</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(diǎn)為80℃，回流冷凝器可用水作為冷卻介質(zhì)。 MeTHF的優(yōu)點(diǎn)：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。甲基作為一個化學(xué)基團(tuán)，它能夠結(jié)合在DNA上某些特定部位。</p><div style="width:100%;text-align: center;"><img style="max-width: 640px; max-height: 320px;" alt="南京2-甲基四氫呋喃直銷公司有哪些,2-甲基四氫呋喃" src="https://tyunfile.71360.com/UploadFile/shweiyun/637389624064664530/9526363.png"></div><p style="text-indent:25px">四氫呋喃普遍用于表面涂料，保護(hù)性涂料，油墨，萃取劑和人造革的表面處理，也專是制藥行業(yè)的主要溶屬劑。普遍應(yīng)用于樹脂溶劑（磁帶涂層、PVC表面涂層、清洗PVC反應(yīng)器、脫除PVC薄膜、玻璃紙涂層、塑料印刷油墨、熱塑性聚氨酯涂層）；反應(yīng)溶劑（格式試劑、烷基堿金屬化合物和芳基堿金屬化合物、氫化鋁和氫化硼、甾族化合物和大分子有機(jī)聚合物）；色譜溶劑（凝膠滲透色譜法）。四氫呋喃也是生產(chǎn)聚四亞甲基醚二醇重要原料，并用于天然氣加味。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，用于電鍍鋁液時可任意控制鋁層厚度且光亮。甲基化的酶促反應(yīng)是由微生物直接參與進(jìn)行的。南京2-甲基四氫呋喃批發(fā)便宜嗎</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。南京2-甲基四氫呋喃直銷公司有哪些</p><p style="text-indent:25px">儲存于陰涼、通風(fēng)的庫房。遠(yuǎn)離火種、熱源。庫溫不宜超過30℃。包裝要求密封，不可與空氣接觸。應(yīng)與氧化劑等分開存放，切忌混儲。采用防爆型照明、通風(fēng)設(shè)施。禁止使用易產(chǎn)生火花的機(jī)械設(shè)備和工具。儲區(qū)應(yīng)備有泄漏應(yīng)急處理設(shè)備和合適的收容材料。采用鐵桶包裝。貯存在陰涼、通風(fēng)、干燥的倉庫內(nèi)，嚴(yán)禁煙火。搬運(yùn)時小心輕放，切勿倒置，避免碰撞。按易燃有毒物品規(guī)定貯運(yùn)。鐵桶包裝，凈重１７０ｋｇ／桶。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，主要的產(chǎn)品是乙酰丙醇（見00420），但也可回收得到副產(chǎn)品2-甲基四氫呋喃。南京2-甲基四氫呋喃直銷公司有哪些</p><p style="text-indent:25px">上海蔚云化工有限公司專注技術(shù)創(chuàng)新和產(chǎn)品研發(fā)，發(fā)展規(guī)模團(tuán)隊不斷壯大。目前我公司在職員工以90后為主，是一個有活力有能力有創(chuàng)新精神的團(tuán)隊。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。公司力求給客戶提供全數(shù)良好服務(wù)，我們相信誠實正直、開拓進(jìn)取地為公司發(fā)展做正確的事情，將為公司和個人帶來共同的利益和進(jìn)步。經(jīng)過幾年的發(fā)展，已成為環(huán)戊酮，甲基異丙基酮，丙二胺，二甘醇胺行業(yè)出名企業(yè)。</p></p><br /><p>文章來源地址: http://www.cdcfah.com/cp/1675066.html</p></div></div></div></div></div><div id="shjga2q" class="page-right twoColRt"><div id="fjli3jv" class="box01 margin10 clearfix"><h3><a 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