Adsorption of β-naphthalenesulfonic acid/sulfuric acid from their solution by weakly basic resin:equilibrium

Experiments for single and bisolute competitive adsorption were carried out to investigate the adsorption behavior of β-naphthalenesulfonic acid(NSA) and sulfuric acid (H_2SO_4) from their solution at 25℃ onto weakly basic resin D301R. Adsorption affinity of sulfuric acid on D301R was found to be much higher than that of NSA. The data of single-solute adsorption were fitted to the Langmuir model and the Freundlich adsorption model. The ideal adsorbed solution theory(IAST) coupled with the single-solute adsorption models were used to predict the bisolute competitive adsorption equilibria. The IAST coupled with the Langmuir and the Freundlich model for sulfuric acid and NSA, respectively, yields the favorable representation of the bisolute competitive adsorption behavior.

Removal of 5-Amino-2-chlorotoluene-4-sulfonic and Chlorhydric Acids from Wastewater by Weakly Basic Resin

This research deals with an investigation of the adsorption of two acids, namely, 5-amino- 2-chlorotoluene-4-sulfonic and chlorhydric acids from their solution onto weakly basic resin. The screening of res-ins, kinetics, and isotherm were studied. The results indicate that the D301R is more appropriate for the removal of acids from solution. The adsorption of acids obeys Langmuir isotherm and the first-order kinetics model. Sorptive affinity of the two acids on D301R was found to be in the order of 5-amino-2-chlorotoluene-4-sulfonic acid> chlorhydric acid. Thermodynamic parameters for the adsorption of acids were calculated and discussed. The maxi-mum removal of acids was observed around 97% and 76% at 25℃ for 5-amino-2-chlorotoluene-4-sulfonic acid and chlorhydric acid , respectively.

Adsorption of β-Naphthalenesulfonic Acid/Sulfuric Acid from Their Solution by Weakly Basic Resin

Experiments for single and bisolute competitive adsorption were carried out to investigate the adsorption behavior of /3-naphthalenesulfonic acid (NSA) and sulfuric acid from their solution at 25C onto weakly basic resin D301R. Adsorption affinity of sulfuric acid on D301R was found to be much higher than that of NSA. The data of single-solute adsorption were fitted to the Langmuir model and the Preundlich adsorption model. The ideal adsorbed solution theory (IAST) coupled with the single-solute adsorption models were used to predict the bisolute competitive adsorption equilibria. The IAST coupled with the Langmuir and the Freundlich model for sulfuric acid and NSA, respectively, yields the favorable representation of the bisolute competitive adsorption behavior.

ADSORPTION OF 1,2,4-ACID BY WEAKLY BASIC RESIN: ISOTHERMS, THERMODYNAMICS AND KINETICS

The adsorption properties, including the adsorption isotherms, thermodynamics and kinetics, of 1-amino-2- naphthol-4-sulfonic acid (1,2,4-acid) onto weakly basic resin ND900 are investigated. Both the Langmuir and Freundlich equations can give a good fit to the adsorption isotherms, which indicates an endothermic and a favorable adsorption in our study range. A high yield in elimination of about 45.21 %-97.28% is obtained for the tested adsorption systems. The capacity and affinity of the adsorption increase with temperature, due to the phenomena of 'solvent-motivated' effects. The value of is 51.59 kJ/mol, which indicates a chemical adsorption and then expects the poor desorption property of ND900. The negative value of indicates the spontaneous nature of the adsorption process, and the positive value of shows the increased randomness at the solid/solution interface during the adsorption process. The value of the adsorption rate constant lower than 0.013 min-1 is indicative of a slow adsorption rate. The intra-particle diffusion must be one of the rate limiting steps.

An Efficient and Novel Synthesis of Carbamate Esters from the Coupling of Amines, Halides and Carbon Dioxide in the Presence of Basic Resin

A convenient, efficient, one-pot, novel process has been developed for the synthesis of carbamates from corresponding alkyl halides and amines using basic resin/CO2 system.

Removal of 5-Amino-2-chlorotoluene-4-sulfonic and Chlorhydric Acids From Wastewater by Weakly Basic Resin: Equilibrium and Kinetics

Objective To study the adsorption of 5-Amino-2-chlorotoluene-4-sulfonic (CLT) and chlorhydric (HCl) acids from wastewater by weakly basic resin. Methods The kinetics and isotherm were studied. Thermodynamic parameters for the adsorption of acids were calculated and discussed. Results The adsorption of CLT and HCl acids followed Langmuir isotherm and the first-order kinetics model. Conclusion The adsorptive affinity of the two acids on D301R is in the order of CLT acid 〉 HCl acid. CLT and HCl acids can be separated.

Treatment of drilling wastewater using a weakly basic resin

Macroporous weak basic anion exchanger （D301R） was used to remove organic substances from drilling wastewater. The effect of pH, temperature and contact time on adsorption behavior was investigated in batch experiments, which indicated that the COD （Chemical Oxygen Demand） removal ratio of drilling wastewater was approximately 90%, and the COD of treated wastewater was below 70 mg/L under appropriate operating conditions. A mixed liquor of NaOH and NaCI was selected as desorbent because of its better elution performance. The results of column dynamic adsorption and regeneration showed that the COD of wastewater could be efficiently removed by D301R resin, and the resin was easily regenerated by the selected desorbent.

Study on the influence of humic acid of different molecular weight on basic ion exchange resin's adsorption capacity

In this paper, humic acid （HA） was ultra-filtered into different molecular weight sections and was characterized by multielement analysis, UV254/TOC, FT-IR and three-dimensional fluorescence spectrometric. Since humic acids of different molecular weights have different hydrophilic and molecular size, the maximum adsorption capacity of basic ion exchange resins appears on the humic acid whose molecular weight ranges from 6000 to 10,000 Da.

ADSORPTION OF HUMIC SUBSTANCES BY MACRO WEAKLY BASIC IONEXCHANGE RESIN AND THEIR EFFECTS ON REMOVAL OF Cu^(2+) AND Pb^(2+)

Adsorption of humic, tannic and gallic acids by a macro weakly basic ion-exchange resin JN-01 was studied. The adsorption capacity of this resin for gallic and tannic acids is much higher than that for humic acid, which can be explained on the basis of both their molecular size and ionization degree. Furthermore, humic acid is separated into different components with molecular weight in the range from 2000 Da to 100000 Da by ultra-filter, and their adsorption isotherms on resin JN-01 indicate that humic acid＇s molecular weight is an important factor which makes significant influence on adsorption. Finally, changes in the amount of Cu^2＋ and Pb^2＋ adsorbed on resin JN-01 as a function of the concentration of each of these three acids were studied. A large increase in the heavy metal ions uptake is observed in the presence of humic substance, such advantages are due to the interactions between the heavy metal ions and the unbound functional groups of the adsorbed organic acids.

强碱性阴离子交换树脂的钨钼解吸试验研究

研究了以NaOH+NaNO_(3)为解吸剂、H_(2)O_(2)为强氧化剂,联合从ZGA351大孔强碱性阴离子交换树脂中解吸钨、钼。考察了联合解吸剂组成、NaOH浓度、NaNO_(3)浓度、H_(2)O_(2)浓度及加入量、NaOH+NaNO_(3)/H_(2)O_(2)流速比、解吸次数对钨、钼解吸效果的影响。结果表明:在NaOH浓度1.5 mol/L、NaNO_(3)浓度5%、H_(2)O_(2)加入量为理论量1.2倍、H_(2)O_(2)浓度30%、NaOH+NaNO_(3)/H_(2)O_(2)流速比40条件下进行6次解吸,钨、钼解吸率分别达99.48%、99.38%,树脂的钼穿透吸附量107.10 g/L,与新树脂的钼穿透吸附量107.77 g/L相当,说明ZGA351树脂进行一次解吸—循环吸附后对钼的吸附性能基本保持不变;一次解吸液中钨质量浓度3.82 g/L,钼质量浓度10.71 g/L,钼钨比2.80,调酸后可直接投入工业生产后续工段用于制备钼酸铵产品;30次解吸—吸附循环试验结果表明,树脂使用寿命可满足工业生产成本要求。该法同步完成了解吸液氧化和树脂再生,可简化工艺流程,降低生产成本,为大孔强碱性阴离子交换树脂的解吸工艺提供一种可行的工艺路线。

若干极性树脂对黄芩甙及黄芩黄素的吸附性能研究

测定了35种具有不同极性的吸附树脂对黄芩甙及黄芩黄素的吸附量,发现弱碱树脂具有较大的吸附量,研究了弱碱树脂对黄芩黄素的吸附动力学,观察到该树脂对黄芩黄素的吸附较快,5h已基本达到吸附平衡。

氨基萘酚磺酸在改性超高交联吸附树脂和弱碱树脂上的静态吸附行为比较

优选弱碱树脂ND 90 0和改性超高交联吸附树脂AL 8,比较研究两者吸附 1 氨基 2 萘酚 4 磺酸 (1,2 ,4 酸 )的静态吸附行为和吸附热力学特征 .两种树脂对 1,2 ,4 酸的吸附属于优惠的吸热吸附过程 .Langmuir和Freundlich两种等温方程都能够很好地描述ND 90 0对 1,2 ,4 酸的吸附等温线 ;仅Freundlich等温方程能很好地拟合AL 8的静态平衡吸附结果 .两种树脂对 1,2 ,4 酸的吸附自由能变均为负值 ,表明了吸附的自发性 ;吸附熵变均为正值 ,与“溶剂置换”现象有关 ;吸附焓变均为正值 ,主要是由于部分化学吸附的存在 .而ND 90 0的吸附焓变远远大于AL 8,表明前者以化学吸附为主、而后者以物理吸附为主的吸附机理 .

弱碱性大孔吸附树脂对腐殖酸的吸附

研究了腐殖酸分子量对弱碱性大孔树脂吸附腐殖酸的影响,阐明了溶液中小分子芳环化合物(苯酚)及盐含量对树脂吸附腐殖酸的影响机制.结果表明,树脂对低分子量腐殖酸的吸附效果要优于高分子量腐殖酸;低浓度苯酚在溶液中可以促进树脂吸附腐殖酸,但溶液中苯酚浓度过高会对树脂吸附腐殖酸产生抑制作用;溶液中的盐对树脂吸附腐殖酸的影响取决于溶液的pH值.

耐候型聚酯粉末涂料的研究进展

针对户外用粉末涂料的老化,介绍了国内外耐候型聚酯粉末涂料的研究进展。阐述了其目前在树脂合成与改性、固化体系和固化剂选择及添加特殊助剂等方面的发展方向,并简要分析了其抗老化机理。指出作为粉末涂料的主要组成物质,聚酯和固化剂的性能对粉末涂料的耐候性起着至关重要的作用,同时添加纳米粒子改性粉末涂料也是提高其耐候性的一种新型有效的方法。

LDPE 2102 TN 00在交联电缆绝缘料中的应用

利用拉伸试验、红外光谱、凝胶渗透色谱、差示扫描量热法、流变表征等方法,对2102 TN 00等几种低密度聚乙烯的性能进行了测试,并以2102 TN 00为基础树脂分别制备了硅烷交联和过氧化物交联聚乙烯电缆料。结果表明,2102 TN 00适合做聚乙烯交联电力电缆绝缘料的基础树脂。

低交换量大孔弱碱树脂的合成、表征及其对绞股蓝皂甙的吸附性能

为筛选适用于天然皂甙分离纯化的吸附树脂,以高交联聚苯乙烯型大孔树脂S-008(Ⅰ)为原料,经氯甲基化和胺化反应,合成了低交换量弱碱树脂(Ⅱ—Ⅴ)。然后,对其结构进行了表征,测定了它们对绞股蓝皂甙的吸附性能。结果说明,胺化试剂与反应条件影响产物树脂的结构,并进而影响产物树脂对绞股蓝皂甙的吸附性能。

有机羧酸在弱碱性树脂上的吸附平衡

The sorption equilibrium experiments were carried out for lactic acid, acetic acid and succinic acid monocomponent systems and lactic acid-acetic acid and lactic acid-succinic acid two-component systems. The effect of weakly basic resins (D301G, D301R), strongly basic resin (201×4 ) and porous resin (D4020) on sorption equilibrium was evaluated. The monocomponent sorption equilibrium was correlated with general equilibrium isotherm. The correlation results were in good agreement with experimental ones. Based on these isotherms and material balances, two-component competitive sorption isotherms could be successfully predicted by monocomponent equilibrium sorption isotherm parameters. The effect of pH on two-component equilibrium uptake was systematically investigated.

弱碱性树脂处理β-萘磺酸废水研究

研究了弱碱性树脂处理 β 萘磺酸废水。考察了废水中硫酸 ,β 萘磺酸在弱碱性树脂Indion 86 0上的吸附与洗脱性能 ,静态吸附平衡模型与实验数据吻合。结果表明 ,Indion 86 0树脂比其他树脂有更优的性能 ,可有效地分离出废水中的 β 萘磺酸 ,且易于洗脱再生 。

自润滑钢板的生产

介绍了国外自润滑钢板的研究和生产工艺 ,自润滑钢板有机涂层的组成 ,以及国外自润滑钢板的生产情况 ,同时提出了攀钢生产自润滑钢板的建议。

用离子交换树脂从氰化物溶液中回收金的技术及其展望

树脂提金是一种先进的无过滤提金技术,金在树脂上的吸附容量很高,有机物质对树脂的吸附过程影响不大,树脂提金工艺成熟,回收率高,对矿石的适应性强。本文将探讨离子交换技术浸金的化学原理,浸金树脂类型研究的最新进展及其前景以及在生产中的工艺特点。