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数种阳离子交换树脂对合成乙基叔丁基醚的催化性能比较 总被引:12,自引:0,他引:12
用A-15,S-54和D-72型强酸性阳离子交换树脂作催化剂,以乙醇和叔丁醇为原料,对合成乙基叔丁基醚的反应进行了研究。讨论了温度,催化剂浓度、反应物初始组成等因素对反应转化率和选择性的影响,并通过活化能,水的阻塞系数的比较,得出了国产D-72型树脂催化活性较好,S-54型树脂选择性较好的结论。 相似文献
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强酸型阳离子交换树脂在许多领域有着重要用途。交换容量是影响树脂应用效果的重要参数,更高的交换容量往往赋予树脂更好的应用性能。本文探讨了高交换容量强酸型阳离子交换树脂的合成方法,结合致孔剂对聚合物内部物理结构的影响机理,采用在单体中加入少量致孔剂的方法得到改性的苯乙烯-二乙烯苯共聚物,再经磺化制备树脂。通过实验优化,得到了钠型交换容量为4.82 mmol/g(干树脂)的凝胶型树脂(交联度为7%),且机械强度好。 相似文献
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江镇海 《精细与专用化学品》1994,(24)
扬子石化公司研究院研制开发的二甘醇单叔丁基醚,最近在南京通过了部级鉴定。 二甘醇单叔丁基醚具有毒性小,亲水性强的优点,是二醇丁醚、二甘醇正丁醚及其它醚类的理想替代产品,可用作涂料、油墨、工业和家用清洗剂及刹车液等产品的高级溶剂。 该产品以二甘醇和碳四馏份丁二烯抽余液为原料,在强酸型阳离子交换树脂存在下合成 相似文献
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氢氟酸改性USY分子筛催化合成乙基叔丁基醚的研究 总被引:3,自引:0,他引:3
以氢氟酸改性USY为催化剂,乙醇和叔丁醇为原料,合成乙基叔丁基醚(ETBE)。与未改性USY和国产强酸性阳离子树脂D005相比,氢氟酸改性USY的催化作用显著。分别考察了催化剂负载量、反应温度和反应时间等因素对醚化反应的影响。最佳操作条件为:n(乙醇)∶n(叔丁醇)=2∶1,原料质量为10 g,催化剂用量为1 g,USY分子筛上氢氟酸负载量6%,反应温度120 ℃,反应时间3 h。最佳操作条件下乙基叔丁基醚的产率为52.46%,叔丁醇转化率为55.83%,选择性为95%。 相似文献
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The synthesis of cation exchange resins via the reaction of poly(vinyl alcohol) as a carrier, citric acid as a catalyst and reactive additive to produce resin structures with grafted carboxy groups, along with a melamine-formaldehyde precondensate, responsible for crosslinking-reinforcing and insolubilizing the resin structure as well as for fixing and binding the acidic functional groups onto the resin structure, has been investigated using varied molar ratios of reactants and varied time as well as temperature. Reaction conditions were selected to prepare a cation exchange resin based on citric acid. Two other cation exchange resins based on tartaric acid and glycolic acid, were also prepared under the same selected reaction conditions. These three resins were characterized by potentiometric titration, water solubility and swellability, as well as durability to use. 相似文献
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We succeeded in introducing cation exchange groups quantitatively into a porous resin having an open-celled monolith structure. The resulting new cation exchange resin had the following advantages compared with conventional ion exchange resins having a bead structure. First, it was easier to pack it in a column. Second, the ion exchange rate of the new cation exchange resin was much higher than that of the conventional ion exchange resins, and the ion exchange band length of the new resin was smaller than that of the conventional ones. In addition, the electric conductivity was about five times higher than that of the conventional ones, although they had similar ion exchange capacities. These unique properties of the new cation exchange resin were caused by the quantitative introduction of ion exchange groups into the resin having the open-celled monolith structure. 相似文献
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以对羟基苯乙酸和甲醇为原料,强酸性阳离子交换树脂为催化剂,研究了催化剂种类、反应时间、反应温度、原料配比、催化剂用量及催化剂重复使用次数对反应的影响,确定了反应的最佳工艺条件为:反应温度为65~70℃,反应时间为4 h,醇酸摩尔比为4∶1,催化剂用量为反应物料总质量的1.5%,酯化收率为85.0%,产品纯度可达到98.5%。使用的催化剂732型强酸性阳离子交换树脂不经处理可重复使用10次以上,显示了较好的稳定性,同时具有催化活性好、价格低廉、不腐蚀设备、无环境污染等优点。 相似文献
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Alkylation of phenol was carried out using methyl tert-butyl ether, mono tert-butyl ether of mono ethylene glycol, tert-butanol and isobutylene in the presence of cation exchange resins, acid treated clay and para-toluene sulfonic acid as catalysts. The selectivity with respect to 2- and 4-tert-butyl phenol was studied. 相似文献