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</ul> </div> </li> </ul> </div> </div> <div id="jnvlddtjlh3" class="nymiddlezty"> <div id="jnvlddtjlh3" class="mianbao">您現(xiàn)在的位置：<a href="/">首頁</a> >> <a href="/news.html">新聞動(dòng)態(tài)</a> >> 專業(yè)人員講解弱酸性陽離子交換樹脂的物理結(jié)構(gòu)</div> <div id="jnvlddtjlh3" class="about_con"> <div id="jnvlddtjlh3" class="newstit">專業(yè)人員講解弱酸性陽離子交換樹脂的物理結(jié)構(gòu)</div> <div id="jnvlddtjlh3" class="newstime"> <span id="jnvlddtjlh3" class="skim"><em>瀏覽次數(shù)：</em>687</span><span id="jnvlddtjlh3" class="skimtim"><em>發(fā)布日期：</em>2022-03-09 </span> </div> <div><span style="font-size: 16px;"> </span></div><div><span style="font-size: 16px;">　　<span style="color: rgb(0, 0, 0);"><strong><a href="http:///Products-32773524.html" target="_blank"><span style="color: rgb(0, 0, 0);">弱酸性陽離子交換樹脂</span></a></strong></span>是一種化學(xué)物質(zhì)，主要用于制造精糖和高級(jí)食用糖漿的提純。離子交換樹脂一般呈現(xiàn)多孔狀或顆粒狀，其大小約為0.5~1.0mm。<br /> </span></div><div><span style="font-size: 16px;">　　</span><strong style="font-size: 16px;">弱酸性陽離子交換樹脂</strong><span style="font-size: 16px;">的物理結(jié)構(gòu)：<br /> </span></div><div><span style="font-size: 16px;">　　離子樹脂常分為凝膠型和大孔型兩類。<br /> </span></div><div><span style="font-size: 16px;">　　凝膠型樹脂<br /> </span></div><div><span style="font-size: 16px;">　　凝膠型樹脂的高分子骨架，在干燥的情況下內(nèi)部沒有毛細(xì)孔。它在吸水時(shí)潤脹，在大分子鏈節(jié)間形成很微細(xì)的孔隙，通常稱為顯微孔(micro-pore)。濕潤樹脂的平均孔徑為2～4nm(2×10-6～4×10-6mm)。<br /> </span></div><div><span style="font-size: 16px;">　　這類樹脂較適合用于吸附無機(jī)離子，它們的直徑較小，一般為0.3～0.6nm。這類樹脂不能吸附大分子有機(jī)物質(zhì)，因后者的尺寸較大，如蛋白質(zhì)分子直徑為5～20nm，不能進(jìn)入這類樹脂的顯微孔隙中。<br /> </span></div><div><span style="font-size: 16px;">　　大孔型樹脂<br /> </span></div><div><span style="font-size: 16px;">　　大孔型樹脂是在聚合反應(yīng)時(shí)加入致孔劑，形成多孔海綿狀構(gòu)造的骨架，內(nèi)部有大量的微孔，再導(dǎo)入交換基團(tuán)制成。它并存有微細(xì)孔和大網(wǎng)孔(macro-pore)，潤濕樹脂的孔徑達(dá)100～500nm，其大小和數(shù)量都可以在制造時(shí)控制。孔道的表面積可以增大到超過1000m2/g。這不僅為離子交換提供了良好的接觸條件，縮短了離子擴(kuò)散的路程，還增加了許多鏈節(jié)活性中心，通過分子間的范德華引力(vandewaal'sforce)產(chǎn)生分子吸附作用，能夠象活性炭那樣吸附各種非離子性物質(zhì)，擴(kuò)大它的功能。一些不帶交換功能團(tuán)的大孔型樹脂也能夠吸附、分離多種物質(zhì)，例如化工廠廢水中的酚類物。<br /> </span></div><div><span style="font-size: 16px;">　　大孔樹脂內(nèi)部的孔隙又多又大，表面積很大，活性中心多，離子擴(kuò)散速度快，離子交換速度也快很多，約比凝膠型樹脂快約十倍。使用時(shí)的作用快、效率高，所需處理時(shí)間縮短。大孔樹脂還有多種優(yōu)點(diǎn)：耐溶脹，不易碎裂，耐氧化，耐磨損，耐熱及耐溫度變化，以及對有機(jī)大分子物質(zhì)較易吸附和交換，因而抗污染力強(qiáng)，并較容易再生。<br /> </span></div> <div class="jnvlddtjlh3" id="news_sx"><li id="jnvlddtjlh3" class="sx_left">上一篇：<a href="/News-1401435.html">使用弱堿性陰離子交換樹脂的注意事項(xiàng)有哪些</a> <br />下一篇：<a href="/News-1385391.html">詳細(xì)解讀鍋爐軟化水樹脂的交換過程</a></li></div> </div> </div> </div> </div> <div id="jnvlddtjlh3" class="clear"></div> <div class="jnvlddtjlh3" id="footer"> <div id="jnvlddtjlh3" 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