共查询到19条相似文献,搜索用时 687 毫秒
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通过理论分析、计算离子交换树脂淋洗达到终点时出水的电导率并结合实际测定其变化趋势,同时考虑真实情况的偏差,确定以电导率为指标的淋洗终点的实际控制值。以电导率控制淋洗终点效果良好,而且比pH值更灵敏、准确。 相似文献
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华润贺州电厂装机容量为2×1000MW超超临界机组,凝结水精处理系统单台机组由2×50%前置过滤器和4×33.3%高速混床组成,高速混床三用一备。高速混床树脂采用国产苏青树脂。文章叙述了苏青树脂在该厂的使用情况,对类似超超临界机组精处理树脂的选择具有一定的借鉴意义。 相似文献
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大孔离子交换树脂对大豆糖蜜脱色效果的研究 总被引:1,自引:0,他引:1
选取6种对大豆糖蜜具有较好脱色能力的离子交换树脂LS-30、LS-21、717、LS-12、LS-41、732,通过静态吸附实验,确定用大孔离子交换树脂阴离子树脂LS-21和阳离子树脂LS-12组成混床树脂,对大豆糖蜜粗糖液进行最佳脱色条件的研究.结果表明:最佳脱色条件为阴阳离子树脂混合比例2:1,上柱大豆糖蜜粗糖液pH 5,流速1.5 BV/h;最佳解吸条件为NaOH-乙醇水溶液(10%NaOH与无水乙醇体积比1:1)作LS-21解吸剂,解吸率达到95.23%;LS-21和LS-12组成的混床树脂在使用的5个周期内,脱色率和解吸率都能达到90%以上. 相似文献
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《食品研究与开发》2015,(23)
研究采用D311型弱碱性阴离子交换树脂对敞口山楂汁进行降酸的规模化生产工艺条件。通过测定不同流速、树脂不同再生程度、树脂再生次数等对总酸、总黄酮透过率的影响,经试验分析,采用D311树脂填充的直径1 m、高2 m的不锈钢降酸罐作为降酸设备时,室温下,最佳流速500 L/h~600 L/h(根据后续生产对山楂汁总酸含量要求确定),用1 mol/L NaOH洗脱液对D311阴离子交换树脂再生时,控制再生液pH 5.5~6.5使树脂不完全再生为宜;树脂多次不完全再生处理后,以600 L/h流速过柱处理500 kg敞口山楂汁,总酸平均透过率为24.7%,总黄酮平均透过率为88.3%。 相似文献
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为了提高酶解产物中具有特定聚合度的直链麦芽低聚糖组分的含量,分别探究了膜分离、活性炭吸附、葡聚糖凝胶柱层析和不同离子交换树脂等分离技术对直链麦芽低聚糖组分含量的影响。结果显示,膜分离、活性炭吸附、葡聚糖凝胶柱层析、钠型/钙型离子交换树脂层析等技术均不适合直链麦芽低聚糖组分的连续化分离操作;相比而言,钾型离子交换树脂层析分离的效果较好,相比于初始酶解液,分离产物中目标组分G3~G6和G5+G6的比例分别提高了39.53%和8.13%,回收率分别达到78.11%和63.89%。在此基础上,以钾型离子交换树脂为固定相吸附剂,利用模拟移动床可进一步提高终产物中G3~G6和G5+G6的比例和回收率。 相似文献
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离子交换树脂在食品工业中的应用现状及其发展方向 总被引:4,自引:0,他引:4
首先综述离子交换树脂近年来在食品工业中的应用现状,并针对其所存在的技术问题,提出研制磁性树脂,将离子交换方法与高梯度磁分离方法有机结合起来,从而实现离子交换与反应分离一体化、连续化,为这一技术的进一步应用指出了方向。 相似文献
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Five anion exchange resins, including a magnetic ion exchange (MIEX) resin, were evaluated for removal of Suwannee River Fulvic Acid (SRFA) in the presence of bicarbonate and chloride. The charge density of SRFA, obtained by potentiometric titration, was used to perform charge balances for ion exchange reactions involving SRFA, bicarbonate, and chloride under different solution conditions. The results clearly show the equivalence of SRFA uptake and chloride release by ion exchange. Although the structure of the anion exchange resins did not affect the stoichiometry of the reaction, the polyacrylic resins did exhibit greater removal of SRFA than the polystyrene resins. The hindered removal of SRFA by the polystyrene resins was hypothesized to be a result of size exclusion. The MIEX resin, which has a polyacrylic structure, performed similarly to the other polyacrylic resins. For the MIEX resin, the separation factor for SRFA over chloride was approximately 8 times greater than for bicarbonate over chloride. This work provides an improved understanding of the interactions between natural organic matter (NOM), inorganic anions, and anion exchange resins, and should result in more effective applications of ion exchange for the removal of NOM in the treatment of drinking water. 相似文献
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通过研究6种大孔吸附树脂和2种离子交换树脂对银杏果多糖溶液色素脱除的影响,筛选出3种树脂:大孔阴离子交换树脂脱色1号、D900和非极性的大孔吸附树脂DA-201C。通过正交试验对脱色条件进行优化。在静态吸附试验研究的基础上,筛选出效果较好的树脂进行动态试验研究。结果表明:银杏果多糖中的色素可能以带负电荷的非极性小分子色素为主,在采用脱色1号树脂,pH值为4.5,温度为25℃,上柱速度为1.5mL/min,上样浓度为选择4 mg/mL,柱容量为2BV的条件下,多糖的脱色率为82.37%,多糖保留率为79.12%,蛋白去除率为88.39%。 相似文献
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磁作用改善离子交换过程的初步探讨 总被引:3,自引:0,他引:3
综述了离子交换树脂近年来在制糖生产过程中的应用状况,针对其不足之处,提出通过磁性树脂的研制,将离子交换与高梯度磁分离有机地结合起来,以达到进一步强化和完善制糖工业的离子交换处理系统。 相似文献
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Robert L. Johnson Bruce V. Chandler 《Journal of the science of food and agriculture》1985,36(6):480-484
A further 20 commercially available ion exchange and adsorbent resins were screened for their affinities for titratable acid and citrus bitter principles. Two anion exchange resins offer the prospect of simultaneous acid reduction and debittering; two cation exchange and five adsorbent resins were moderate to powerful adsorbers of the bitter principles. The food regulation status of these resins is discussed. 相似文献
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酒精去杂新工艺的研究 总被引:2,自引:0,他引:2
本文根据酒精中的主要有害物质──甲醇、杂醇油和醛的物理和化学性质,系统地研究了物理和化学的去杂方法,确定了酒精去杂的新工艺:待处理酒精→(1号树脂柱)4号树脂柱→(1号分子筛柱)2号分子筛柱→简单蒸馏或过滤→优质酒精。通过该工艺流程,对酒精中的甲醇、杂醇油和醛的平均去除率分别为93.6%、77.8%和80.8%,故该工艺能有效地去除酒精中的杂质。 相似文献
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Model solutions containing catechin, caffeic acid, chlorogenic acid, phloridzin and rutin were used to examine their recovery using two adsorbent resins, four cation and four anion exchange resins at two temperatures (20 °C and 40 °C) and two pH values (pH 1 and 7). In addition, the interference of glucose, fructose and sucrose and of a saccharide mixture on polyphenol binding by one anion exchange and two adsorbent resins was assessed to approximate real conditions. In a further step polyphenol recovery using the aforementioned adsorbent and ion exchange resins was studied upon the addition of the amino acids alanine, glutamic acid, phenylalanine, lysine and histidine. The data reveal that both saccharides and amino acids influence polyphenol recovery positively and negatively, depending on the experimental conditions and the resin type; possible explanations for these findings are discussed. The information obtained in this study helps to gain a better understanding of the complex mechanisms of ion exchange and adsorption processes involving multi-component systems. The insights gained allow to design cost-efficient recovery of plant secondary metabolites from crude extracts for producing tailor-made health-beneficial fractions. 相似文献