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    The initial L-arginine concentration should be more than 15 g/L to keep over 90% precipitation yield.
    L精氨酸初始浓度应在15 g/L以上才可保证沉淀在90%以上.
    Effects of the composition of the sodium aluminate solution(concentration of Al_2O_3 and molar ratio of Na_2O/Al_2O_3)and the precipitation time on the precipitation yield of Al_2O_3 and Na_2O and physico-chemical properties of the precipitates such as pore volume,specific surface area,and Na content were studied.
    研究了铝酸钠溶液组成(Al2O3浓度和苛化系数)以及晶种循环使用次数等条件对溶液分解率、Na2O析出率和种分产物孔体积、孔径分布、比表面积以及钠含量等物化性质的影响.
    When the additive amount of PEG3000 is 140 mg·L~(-1),the surfactant can enlarge the adsorption on the surface of Al(OH)_3,decrease the surface tension of caustic aluminate solutions,enhance the precipitation yield about 8%,intensify the process of seeded precipitation from caustic aluminate solutions effectually.
    L-1时,PEG3000在Al(OH)3颗粒表面的吸附量最高,铝酸钠溶液的表面张力最低,其分解率可提高8%,有效地强化了铝酸钠溶液晶种的分解.
    Because of the low precipitation rate and lower precipitation yield than theroretical precipitation ratios, study on promoting Gibbsite particles precipitating from caustic aluminate solutions is always hotspot in aluminum industry.
    铝酸钠溶液分解速率缓慢,种分分解率远低于理论分解率,因此铝酸钠溶液强化分解研究成为铝酸钠种分过程研究的热点方向。
    The hexafluorophosphate was isolated as [Ni(NH_3)_6(PF_6)_2 (precipitation yield is 97.8%) and then completely transformed into NH_4PF_6 by solvent extraction of naphthenic acid or by hydrolysis-ion exchange. With this new method, the purity of ammonium hexafluorophosphate obtained from the mixture of Lange's reaction is 99% (yield 52%), and the Ni content is less than 20 ppm.
    以硫酸六氨合镍作沉淀剂将六氟磷酸根以正Ni(NH_3)_6](PF_6)_2沉淀形式分离出(沉淀率为97.8%),然后,沉淀物经环烷酸溶剂萃取法或水解——阳离子交换法处理,完全转化为NH_4PF_5。 用比新方法从郎格(Lange)反应的混合物中获得的六氟磷酸铵,其纯度达99%,产率52%,镍含量小于20ppm。
    Effects of pH, mole ratio of benzaldehyde to L-arginine, NaCl and NH4Cl concentrations, mass ratio of L-lysine to L-arginine and initial L-arginine concentration on L-arginine precipitation yield by reacting with benzaldehyde were investigated.
    考察了pH值、苯甲醛与L精氨酸的摩尔比、氯化钠和氯化铵浓度、L赖氨酸与L精氨酸的质量比及L精氨酸初始浓度等因素对苯甲醛反应沉淀L精氨酸的影响. 结果表明,苯甲醛反应沉淀L精氨酸的pH>11为宜;
    Results show that the maximum precipitation yield(90%) is reached at pH higher than 11 and mole ratio of L-lysine to L-arginine of 1.25, the yield hardly changes with the increase of NaCl concentration but decreases sharply with the increase of NH4Cl concentration, the precipitation yield also decreases with the increase of mass ratio of L-lysine to L-arginine.
    氯化钠对沉淀基本上没有影响,而氯化铵浓度增大则沉淀率迅速下降; 当L赖氨酸与L精氨酸的质量比小于1时L精氨酸沉淀率仍可以在80%以上,当它们的质量比大于1以后,沉淀率迅速下降;
    The max precipitation yields of silica during acidification were 82% and 85% at pH 7.5.It was also demonstrated that HGN black liquors are easier to process than that of other non-wood materials, and the traditional alkali-recovery system is feasible for processing the HGN black lignin from economical and technical.
    在黑液酸化过程pH值7.5时,SiO2析出率最高分别为82%、85%,低于其他非木造纸原料。
    The practical running results show that the precipitation yield is up to 98%,and average value of increases by 0.5%,which is beneficial to improving the quantity and quality of aluminium hydroxide.
    应用结果表明,分解合格率达到98%,分解率稳定并提高了0.5%,有效地促进了氢氧化铝产品产量与质量的提高。
    The alcohol consumption of both methods was compared and the influences of either method on pectin precipitation yield and pectin quality were also studied.
    比较了不同沉淀方法的乙醇消耗量,探索了不同沉淀方法对果胶沉淀得率和品质的影响。
 

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