共查询到10条相似文献,搜索用时 15 毫秒
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XU Mancai OU Zhize SHI Zuoqing XU Mingcheng LI Haitao YU Shanxin HE Binglin 《Chinese Journal of Reactive Polymers》2000,(1)
1. INTRODUCTIONReduction of organic compounds by NaBH, is often used in organic synthesis. The reactiollis only proceeded in the interface between the organic phase and water phase because of the lowsolubility of NaBH. in organic compounds, and this results in the slow reaction rate and lowyield. In order to increase the reaction rate and yield, NaBH, was converted totetraalkylammonium borohydrides II' 'l, and this made the operating process complex and greatamount of quaternary ammon… 相似文献
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ADSORPTION OF TANNIN FROM AQUEOUS SOLUTION ONTO MACROPOROUS CROSSLINKED POLY(N-VINYL-ACETAMIDE) VIA HYDROGEN BONDING 总被引:3,自引:0,他引:3
XU Mancai WANG Cairong XU Mingcheng SHI Zuoqing ZHANG Shang LI Haitao SHI Rongfu FAN Yunge HE Binglin 《Chinese Journal of Reactive Polymers》2000,(1)
I INTRODUCTIONTannin is existed widely in the roots, stems and fruits of many plants 111. Tannin is stronglyastringent and puckery due to the hydrogen bonding between the phenolic hydroxyl groups intarmin and abide groups in Protein al. A series of PYOb\m won\d be abed if t~ is nOIremoved from the products made from plants. For example, the injection site of the patientwould be red and swollen if tannin had not been removed from the injection made from plantssuch as red-rooted sajvia; … 相似文献
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盐卤硼酸盐化学--Ⅳ.浓缩盐卤中析出的新硼酸盐固相 总被引:15,自引:3,他引:15
本工作采用模拟合成盐卤硼酸盐的方法,配合多种物理分析法进行物相鉴定,确认浓盐卤析出硼酸盐固相是由两种硼酸盐组成。其中一种硼酸盐的化学式为MgO·3B_2O_3·7H_2O,另一种是未见报导的新硼酸盐,化学式为2MgO·2B_2O_3·MgCl_2·14H_2O。这种含氯化镁的硼酸镁水合复盐的晶粒细小,电镜下呈针柱状,我们给出了它的伦琴射线粉晶衍射数据,红外光谱和热重分析结果,在差示热分析曲线上出现两个明显的晶型转变放热峰,与柱硼镁石(MgO·B_2O_3·3H_2O)的差示热分析曲线类似。 相似文献
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Shao-hua Huang Zheng-wu Bai Chuan-qi Yin Shi-rong Li 《高分子科学》2006,(2):107-114
Two polyurethanes of different molecular weights were prepared by the copolymerization of phenyl diisocyanate and diisopropyl tartrate. The polyurethanes having terminal isocyanate groups were reacted with 3-aminopropyl silica gel to afford two chiral stationary phases. The Mn of the two polyurethanes were 4057 g/mol and 6442 g/mol. The polyurethanes and the corresponding chiral stationary phases were characterized by FT-IR, 1H NMR and elemental analysis. The loading capacities of the polyurethanes on silica gel were 0.68 mmol units/g and 0.61 mmol units/g, respectively. The separation performance and the influence of additives, triethylamine and trichloroacetic acid, on the separation of chiral compounds were investigated by HPLC. The chiral stationary phase prepared from polyurethane with Mn of 4057 g/mol demonstrated better enantioseparation capability than that with Mn of 6442 g/mol. Additionally, it was found that the addition of triethylamine and trichloroacetic acid in the mobile phases significantly improved the enantioseparation for these two chiral stationary phases. 相似文献
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《Journal of Coordination Chemistry》2012,65(4):261-268
Abstract The reaction of 6-methylpyridine-2-carboxaldehyde phenylhydrazone (L) with Ph2SnCl2 has resulted in the formation of a complex salt [LH+]2[Ph2SnCl4]2-. X-ray diffraction studies on the salt reveal the structure of the [Ph2SnCl4] dianion to be centrosymmetric with the tin atom in a distorted octahedral trans-C2Cl4 environment; Sn-Cl(1) 2.598(2), Sn-Cl(2) 2.5875(7) and Sn-C(1) 2.146(3) Å. Associated with the dianion are two [PhN(H)NC(H)C5H3(Me)N(H)] cations via two hydrogen bonding contacts apiece, unusually involving a true Sn-Cl bond. 相似文献
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在Cu/ZnO/Al2O3催化剂上进行甲醇部分氧化蒸气重整制备氢气的模拟研究 总被引:1,自引:2,他引:1
两大气压下,对管状填充床反应器中在Cu/ZnO/Al2O3催化剂上甲醇部分氧化蒸气重整制备氢气进行了实验.在Cu/ZnO/Al2O3催化剂上进行该反应体系动力学研究的基础上,建立了该反应器内的稳态质量和热量衡算方程,同时考虑了颗人的扩散限制,模型的预测结果与实验结果吻合较好,该模型工作的开展有助于对该体系进行优化。 相似文献