共查询到20条相似文献,搜索用时 15 毫秒
1.
SCN- from desulphurization waste solution of cocking plant was separated by D241 anion exchange resin. When SCN- concentration of the waste liquid is 0.116mg/ml, its dynamic exchange capability is 93.61 mg/g resin. The condition of use KOH as eluted solution to elute SCN- is KOH concentration 0.5mol/L, flow velocity 60 ml/h, with 60ml eluted solution can completely elute SCN- which exchanged from waste solution. Vaporized the eluted solution, obtain the KSCN crystal in which the concentration of SCN- is 53.34%, converts to KSCN is 89.2%. SCN- crystal was separate out from Na2S2O3/KOH mixed solution. The relationship between the proportion of Na2S2O3/KOH,free liquids in crystal and the saturation solution volume when crystal appear、 the content of KSCN in crystal: the ratio of K2S2O3/KSCN show direct ratio with the saturation solution volume when the crystal birth, r2=0.9964; when the ratio of K2S2O3/KSCN is between 0.15 and 0.25, the content of SCN in the crystals grow with K2S2O3 content increases, the content of free liquids in crystal also along with it increase; When the ratio of Na2S2O3/KOH is 0.15, the content of SCN- is 54.56%;convert to KSCN is 76.2%. When the ratio of K2S2O3/KSCN is 0.25, the content of SCN- is 65.28%;convert to KSCN is 91.2%. When the ratio of K2S2O3/KSCN exceeds 0.25, the content of SCN- in the crystals and the content of free liquids in crystal reduce when the ratio of K2S2O3/KSCN increase. 相似文献
2.
D241树脂分离纯化黄芩总黄酮的研究 总被引:10,自引:1,他引:10
本文研究了用241树脂分离纯化黄芩总黄酮的方法和工艺。实验结果表明:D241树脂对黄芩总黄酮的静态交换容量是77mg/ml树脂。在pH11.0、流速2.0BV/h、提取液中总黄酮浓度17.5mg/ml条件下,D241树脂对黄芩总黄酮的动态交换容量为43.8mg/ml。用60%甲醇作为黄芩总黄酮洗脱剂,在PH4.0、洗脱流速1.5BV/h条件下,4.5BV洗脱剂即可完全洗脱被D241树脂交换的黄芩总黄酮。与酸沉淀法相比较,经过除去果胶,总黄酮纯度由33.34%提高到74.9%,粗品收得率由11.52%降低至4.83%;经过D241树脂分离纯化,其纯度达到91.5%,产品收得率3.54%。 相似文献
3.
4.
研究了D406螯合树脂对硫酸锌溶液中氟的吸附和解吸性能,考察了影响氟吸附和解吸的因素以及该树脂吸附和解吸氟的动力学参数。结果表明,在25℃、pH=2、硫酸锌浓度为1.50mol/L、氟离子浓度为200mg/L条件下,D406螯合树脂对氟的吸附量为5.55mg/g。D406螯合树脂对氟的吸附符合Freundlich吸附模型。吸附和解吸的动力学符合Boyd液膜扩散方程,吸附反应活化能Ea=12.14kJ/mol,解吸反应活化能Ea=19.54kJ/mol。 相似文献
5.
大孔树脂对水溶液中邻苯二甲酸的吸附行为及其热力学研究 总被引:18,自引:0,他引:18
研究了NDA-150,ND-99和ND-900大孔树脂对水溶液中邻苯二甲酸的吸附热力学特性,结果表明,3种树脂对邻苯二甲酸的吸附都同时满足Freundlich和Langmuir等温吸附方程;NDA-150树脂存在以π-π作用为主的吸附作用,ND-99树脂的吸附行为是由氢键作用及π-π作用共同作用所致,ND-900树脂通过Lewis作用和静电力吸附邻苯二甲酸,吸附是一放热过程且吸附能够自发进行,ND-900树脂上的吸附是熵推动为主的吸附过程,而NDA-150、ND-99树脂上的吸附均为焓推动为主的吸附过程。 相似文献
6.
7.
8.
9.
采用单柱离子色谱法对纸浆滤液中的有害离子SO_4~(2-)、S_2O_3~(2-)进行测定.用lmmol·L~(-1)柠檬酸钠溶液作为淋洗液,在6min内完成分离测定.有良好的线性关系和重现性.标准回收率分别为99.82%和98.48%,共存离子基本不干扰测定. 相似文献
10.
研究了3种非苯乙烯超高交联吸附树脂对空气、溶液及表面浮苯的吸附滤除性能。结果表明,在C0=1722.6mg/L和C0=181.4mg/m3的水溶液或空气体系中,CMB-CMB-XDC(二氯甲基联苯自聚后与二氯甲基苯共聚)树脂对苯的吸附量与穿透吸附量分别可达874.6mg/g和41.59mg/g;对水面浮苯的吸附在3min内可达4360mg/g以上。新型非苯乙烯树脂吸附速度快、容量大,可经再生反复使用,预期在非极性芳烃废气(水)净化及突发污染事故快速处理领域具有很好的应用前景。 相似文献
11.
RECOVERY OF p-AMINOPHENOL (PAP) FROM AQUEOUS SOLUTION BY HYPER-CROSS-LINKED RESIN AND ITS USE FOR WASTEWATER TREATMENT 总被引:1,自引:0,他引:1
p-Aminophenol (PAP), a typical amphoteric compound, has been widely used as raw chemical material and important interrnediate in various fields. To study on the recovery of PAP, an experimental comparison of the adsorption and desorption properties of PAP onto three types of hyper-cross-linked resins in aqueous solutions was performed. This paper focuses on the static equilibrium adsorption and desorption behaviors, the adsorption thermodynamics, the column dynamic adsorption and desorption, and other influencing factors of adsorption, such as temperature and pH values. All the isothermal data fit well to the Freundlich model. The capacity of equilibrium adsorption for PAP on NG-10 is the highest within the temperature range 288K-318K, which may greatly contribute to the advantage in specific surface area, especially the micropore area, of the adsorbent. While in the desorption experiments, NG-9 achieved relative well regeneration efficiency whether by ethanol or by 4% hydrochloric acid. Furthermore, the results of column tests and field applications were also proved that NG-9 was an effective sorbent for the reclamation PAP from wastewater. 相似文献
12.
大孔氯甲基化聚苯乙烯小球先后与乙二胺、2-氯乙酸反应得EDTA型螯合树脂(PS-EDTA),再用磷酸在室温处理得PS-EDTA/P树脂。PS-EDTA/P树脂被用于水相中Cu2+、Zn2+和Cd2+的吸附净化处理,探讨了溶液的pH值、初始金属离子浓度、时间、温度等因素对吸附性能的影响,并研究了其对重金属离子的吸附动力学和热力学。结果表明,PS-EDTA/P树脂对Cu2+和Zn2+的吸附符合Langmuir等温式、对Cd2+的吸附符合Freundlich等温式,准二级吸附动力学方程能够很好地描述3种金属离子在树脂上的吸附动力学行为。同时,PS-EDTA/P树脂对重金属吸附的热力学参数表明,PS-EDTA/P树脂对Cu2+、Zn2+和Cd2+的吸附是一个自发的、吸热的过程。已吸附Cu2+、Zn2+和Cd2+的树脂可以用0.1mol/L HCl解吸,解吸后的树脂对Cu2+、Zn2+和Cd2+仍具有较高的吸附量。 相似文献
13.
14.
15.
16.
17.
固定床中树脂催化油脂副产物制备生物柴油 总被引:5,自引:0,他引:5
以棕榈油脱臭馏出物(PFAD)和无水乙醇为原料,强酸性阳离子交换树脂为固体酸催化剂,在自制的固定床反应器中进行酯化反应,成功合成了脂肪酸乙酯(生物柴油).固定床反应器尺寸为φ1.62 cm×72.7 cm.结果表明,酯化反应的最佳物料比为n(乙醇)/n(PFAD)=13.2;反应温度在乙醇正常沸点783℃以下时,反应温度越高,酯化率越大;酯化率随催化接触时间增大而增大,但增大速度逐渐趋缓.当在常压下,75℃反应55min时,脂肪酸乙酯的一次转化率可达76%左右. 相似文献
18.
微波消解/ICP-AES法测定污水处理厂污泥中的重金属 总被引:2,自引:0,他引:2
采用微波消解/电感耦合等离子发射光谱法(ICP-AES)测定了城市污水处理厂污泥中Cd、Cr、Cu、Mn、Mo、Ni、Pb、Zn等8种重金属元素,并优化了ICP仪器工作参数及微波消解条件.方法的检出限为0.001~0.01mg/L.相对标准偏差为2.0%~9.2%(n=7),回收率为85.3%~105.0%. 相似文献
19.
固定床中树脂催化油脂副产物制备生物柴油 总被引:4,自引:0,他引:4
以棕榈油脱臭馏出物(PFAD)和无水乙醇为原料,强酸性阳离子交换树脂为固体酸催化剂,在自制的固定床反应器中进行酯化反应,成功合成了脂肪酸乙酯(生物柴油).固定床反应器尺寸为Φ1.62cm×72.7cm.结果表明,酯化反应的最佳物料比为n(乙醇)/n(PFAD)=13.2;反应温度在乙醇正常沸点78.3℃以下时,反应温度越高,酯化率越大;酯化率随催化接触时间增大而增大,但增大速度逐渐趋缓.当在常压下,75℃反应55min时,脂肪酸乙酯的一次转化率可迭76%左右. 相似文献