共查询到20条相似文献,搜索用时 78 毫秒
1.
2.
3.
古龙酸结晶母液的回收利用 总被引:2,自引:0,他引:2
利用HD—8及D315二种树脂相继处理古龙酸的结晶母液,以除去其中的杂质,可以使得经二种树脂处理过的古龙酸液色素在420nm处的吸光值下降到与原液稀释12倍在420nm吸光值相当,在830nm处的吸光值下降到原来的约1/4,在280nm处的吸光值下降到原来的1/2,从而能从处理液中结晶出合格的古龙酸。经HD—8处理的古龙酸回收率为94.2%,经D315处理的古龙酸回收率为88.9%,结晶得到古龙酸成品回收率为74.6%。 相似文献
4.
5.
6.
本文将学生实验后留下的质量分数约为70%的废硫酸液回收,测定其基本性质后,进行处理,试验证明加水稀释是净化处理的最好方法。稀释后杂质发生絮凝,经沉降、过滤、浓缩,再用于同样的实验并进行对照,与新配的硫酸实验效果基本一致,可以重新利用。 相似文献
7.
8.
9.
10.
基于废弃固定化酶再利用的高容量强阳离子交换树脂及其对溶菌酶的吸附性能 总被引:1,自引:0,他引:1
采用表面引发-原子转移自由基聚合( SI-ATRP)技术,以废弃的固定化酶为基质、4-乙烯基苯磺酸钠为单体,30℃聚合3 h,制备了一种新型强阳离子交换树脂。采用傅里叶变换红外光谱( FT-IR)对合成的强阳离子交换树脂进行表征。以溶菌酶为模型蛋白,考察了溶菌酶初始浓度、离子强度、有机溶剂浓度、吸附时间及温度对吸附容量的影响。结果表明,强阳离子交换树脂对溶菌酶的吸附是一个放热的过程。在室温下对溶菌酶的最大吸附量可达240 mg/g,在30 min内快速达到吸附平衡,比文献报道的阳离子交换树脂具有更好的吸附性能。 Langmuir吸附模型与准二级动力学方程可以较好地对吸附过程进行拟合。 相似文献
11.
Using DFT method, the stable adsorption configurations of Cu4 cluster on Cr2O3 (0001) surface were investigated. The regular tetrahedron structure and the planar structures were considered as the initial adsorption configuration of Cu4 cluster, respectively. The adsorption energies of the two structures were also calculated. The simulation result indicated that the adsorption energy of the regular tetrahedron structure was higher than that of the planar structure, and thus the regular tetrahedron structure was confirmed to be the stable adsorption configuration for Cu4 cluster on Cr2O3 (0001) surface. Moreover, it was observed that the Cu4 cluster showed the definite stable adsorption sites on Cr2O3 (0001) surface, namely 3‐fold O sites. During the adsorption process of Cu4 cluster onto Cr2O3 (0001) surface, the Cu4 cluster could bond with more Cr or O atoms on the surface, and the apparent charge transfer also occurred correspondingly. Meanwhile, the Cu4 cluster and Cr2O3 (0001) surface would bond in the form of local polarization to enhance the stability of adsorption configuration. 相似文献
12.
Reactions between HgO, PbO, or PbO2 and 2.5–95 wt.% H2SO4 are studied at temperatures up to the boiling point of the acid. Depending on the oxide reactant, the H2SO4 concentration, and synthesis temperature, HgSO4, Hg3O2(SO4), PbSO4 and Pb2O(SO4) are obtained as identified reaction products. The thermal stability of HgSO4, Hg3O2(SO4), PbSO4, Pb2O(SO4), and PbO2 is examined and the results supplement and modify earlier findings. The redetermined crystal structure of Hg3O2(SO4) on the basis of powder neutron diffraction data shows that its space group (P31) is of lower symmetry than earlier reported (P3121). 相似文献
13.
14.
采用浸渍法制备了不同负载量的Al2(SO4)3/SiO2催化剂.使用BET、XRD、FT—IR、异丙醇探针反应、NH3吸附量热和NH3吸附红外等手段对催化剂进行了表征,并测试了其在甲醇脱水合成二甲醚反应中的活性.BET、XRD和FT-IR结果表明,载体SiO2的表面积较高,随着Al2(SO4)3负载量的增加,样品的表面积逐渐降低,当Al2(SO4)3负载量高于20%时,样品表面开始出现晶相Al2(SO4)3.NH3吸附量热和NH3吸附红外结果表明,载体SiO2的酸性很弱,负载了Al2(SO4)3后,样品酸性大大增强,且酸性随着Al2(SO4)3负载量的增加先增强后减弱.样品表面同时存在B酸中心和L酸中心,但以B酸中心为主.Al2(SO4)3负载量为3%的样品的表面酸性最强,因而在甲醇脱水反应中表现出最高的反应活性,533K,甲醇转化率为83.5%,二甲醚选择性100%. 相似文献
15.
Synthesis and Electrochemical Performance of Spinel LiMn2O4—x(SO4)x Cathode Materials 总被引:1,自引:0,他引:1
IntroductionInrecentyears ,withthedevelopmentofallsortsofcellularphones ,camcorders ,laptopcomputers ,thelithium ionsecondarybatteriesbasedontheuseoflithi um manganese oxideLiMn2 O4 1,2 haveattractedmuchat tention .ButtheLiMn2 O4 cathodematerialhasadisad vantageof… 相似文献
16.
B.J. Chen Y.D. Li C.D. Feng H.M. Zhang C. Yan W.B. Xiao 《Magnetic resonance in chemistry : MRC》2020,58(10):921-928
The local structures and the g factors gi (i = x, y, z) for Ni3+ centers in Na2Zn(SO4)2·4H2O (DPPH) and K2Zn(SO4)2·6H2O (PHZS) crystals are theoretically studied by using the perturbation formulas of the g factors for a 3d7 ion with low spin (S = 1/2) in orthorhombically compressed octahedra. In these formulas, the contributions to g factors from both the spin-orbit coupling interactions of the central ion and ligands are taken into account, and the required crystal-field parameters are estimated from the superposition model and the local geometry of the systems. Based on the calculations, the Ni-O bonds are found to suffer the axial compression δz (or Δz) of about 0.111 Å (or 0.036 Å) along the z-axis for Ni3+ centers in DPPH (or PHZS) crystals. Meanwhile, the Ni-O bonds may experience additional planar bond length variation δx (≈0.015 Å) along x- and y-axes for the orthorhombic Ni3+ center in DPPH. The theoretical g factors agree well with the experimental data. The obtained local structural parameters for both Ni3+ centers are discussed. 相似文献
17.
Contributions on the Thermal Behaviour of Sulphates. XVI. The Chemical Vapour Transport of Ga2(SO4)3 with Cl2 and HCl. Experimental Results and Calculations Crystals of anhydrous Ga2(SO4)3 can be grown by means of CVT (e. g. 525°C → 475°C) in the less hot region of a closed silica ampoule. We investigated the dependance of the deposition rate on the concentration of the transport agent (Cl2, HCl) and the transport temperature (475°C ≤ T ≤ 750°C; T2 > T1; ΔT = 50°C; T = 0.5(T1 + T2)). Experimental results and thermodynamic calculations on the basis of ΔFH (Ga2(SO4)3) = ?686.5 kcal/mol show a good agreement. 相似文献
18.
Contributions on the Thermal Behaviour of Sulfates XII. The Chemical Vapour Transport of In2(SO4)3 with Cl2 and HCl. Experimental Results and Calculations By means of CVT (T1 between 500°C and 825°C; ΔT = 50°C), well shaped crystals of anhydrous In2(SO4)3 can be grown in the less hot region of a closed silica ampoule. We investigated the dependence of the deposition rate on the variation of the concentration of the transport agent (system In2(SO4)3/Cl2) and on the variation of the transport temperature (In2(SO4)3/Cl2 as well as In2(SO4)3/HCl). A comparison of the experimental results with thermodynamical calculations shows a satisfying agreement. The influence of the variation of some additional parameters (H2O from the wall of the ampoule; ΔBH(In2(SO4)3)) on the deposition rate is discussed. 相似文献
19.
长期以来人们对羰基配合物进行了较为充分的研究,但忽略了与之对应的异腈配合物领域。本文在四氢呋喃溶剂中制得两个过渡金属异腈配合物,初步研究了它们的性质,并讨论了它们的红外光谱和热重分析。 1 实验部分 1。1 试剂和仪器 CrCl_3(thf)_3按文献合成。CNCH_2C_6H_5和NaB(C_6H_5)_4购自Aldrich试剂 相似文献
20.
Contributions on the Thermal Behaviour of Sulfates. VIII. The Chemical Vapour Transport of FeSO4 with NH4Cl and Fe2(SO4)3 with Cl2 or NH4Cl. Experiments and Calculations Well shaped crystals of FeSO4 and Fe2(SO4)3 can be grown by CVT (T1? 650°C). We investigated the dependence of the transport rate on the concentration of the transport agent (Fe2(SO4)3/Cl2 and Fe2(SO4)3/NH4Cl) as well as on the temperature (FeSO4/NH4Cl and Fe2(SO4)3/Cl2). Using ΔfH(FeSO4) = ?220 kcal/ mol, Cp(T) = 30.1 + 9.9 · 10?3 ×T and ΔfH(Fe2(SO4)3) = ?615.4 kcal/mol a satisfying agreement between thermodynamical calculations and experimental results can be reached 相似文献