共查询到18条相似文献,搜索用时 78 毫秒
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研究了根据酮麝香、1,3-二甲基-2,4-二硝基-5-叔丁基苯晶体生长速度的不同,从对二者均达到饱和的溶液中分离得到1,3-二甲基-2,4-二硝基-5-叔丁基苯晶体的过程,计算了晶体生长速度并进行了实验验证。 相似文献
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1 INTRODUCTION Musk ketone and musk xylene are important syn- thetic nitro-musks. They are high boiling substances and subject to decomposition under the condition of heat and light. When they are melted, the liquid mix- ture is very sticky, which lead to high resistance to heat and mass transfer and difficulty in solidification. As a result, it is reasonable to employ solution crys- tallization to separate and purify musk mixture. As the basis of solution crystallization, the solubility … 相似文献
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溶液结晶用于分离人造麝香的研究 总被引:3,自引:0,他引:3
对酮麝香溶液结晶的分离进行了系统地研究, 给出了全部计算公式, 同时克服了传统结晶器的缺点, 设计了一种可以实现多级分离的结晶器, 并建立了该结晶器的实验装置, 它集结晶、过滤、洗涤于一体。实验结果与计算结果对比令人满意 相似文献
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To evaluate the effect of two liquid phase on the separation of musks mixture, the phase equilibria of musk ketone musk xylene dimethyl sulfoxide heptane system were studied for the first time. The whole and every part of the phase equilibrium for the quaternary system were shown by three-dimensional phase diagrams, the liquid-liquid equilibria, solid-liquid equilibria and solid-liquid-liquid equilibria of the quaternary system were also shown. As a result, the compositions of musks in the equilibrium liquid phases were different from those in the feed, that is, musk ketone was enriched in dimethyl sulfoxide phase while musk xylene was enriched in heptane phase. So these equilibrium liquid phases were useful in separating musk ketone and musk xylene. On the basis of these results, a new process “two liquid phase extractive crystallization” was proposed to separate the eutectics of musk ketone and musk xylene. 相似文献
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五水偏硅酸钠结晶特点及生产控制 总被引:1,自引:0,他引:1
根据Na2O-SiO2-H2O三元相图和五水偏硅酸钠结晶特点,给出了五水偏硅酸钠结品的物系组成线性关系式及结晶操作线。经小试实验和工业生产,表明它们对溶液法生产五水偏硅酸钠具有指导意义。 相似文献
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以乙二胺、羟基乙腈、异丙醇为原料,合成一种碳酸钠结晶抑制剂ELYZ-09,并研究了反应温度与搅拌速率对结晶抑制剂效果的影响,当合成温度为70 ℃、搅拌速率为420 r/min时,合成的结晶抑制剂效果最好。对研制的结晶抑制剂做了现场应用实验,当自制的碳酸钠抑制剂ELYZ-09加注质量分数≥0.12%时,20%(质量分数)的碳酸钠溶液冷却到10 ℃时没有晶体析出,抑制结晶率达到100%,同时不会对碳酸钠溶液的pH、碳酸根含量产生影响。 相似文献
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为充分利用光卤石炼镁生产中副产的废电解质和综合利用青海盐湖镁资源,研制开发出兑卤冷结晶法合成光卤石生产工艺。着重论述了该生产工艺的研制过程。工艺的具体过程是:将废电解质制成饱和溶液,加热溶解、除钠,再与水氯镁石溶液充分混合,经沉降槽自然冷却降温,结晶析出合成光卤石。实验室实验、扩大试验证明,采用兑卤冷结晶法生产出的合成光卤石,其产品质量完全符合电解炼镁要求。 相似文献
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Phase Diagram of the BaO-CuO Binary System 总被引:1,自引:0,他引:1
The phase diagram of the BaO-CuO binary system has been investigated in air and in a mixed gas of Ar + 0.21 atm of O2 . The existence of two compounds, BaCuO2 and Ba2 CuO3 , was confirmed. The phase transition of Ba2 CuO3 from an orthorhombic to a tetragonal phase was observed to occur at 1083 K. The lattice constants of the tetragonal Ba2 CuO3 phase were determined to be a = 1.2975 nm and b = 0.3992 nm. BaCuO2 was shown to melt incongruently by a synthetic reaction at 1289 K. Furthermore, the existence of two eutectic reactions and a peritectic reaction in the present system was confirmed. 相似文献
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对蛋氨酸皂化液的冷却结晶除碱过程进行了研究,系统考察了冷却终温、降温速率、晶种添加量等结晶参数对冷却结晶产品十水碳酸钠的纯度以及碳酸钠脱除率的影响。实验结果表明:随着冷却终温的升高,碳酸钠的脱除率逐渐降低,十水碳酸钠的纯度先增加然后几乎保持不变;随着降温速率的增大,十水碳酸钠的纯度逐渐降低,碳酸钠的脱除率变化不大;随着十水碳酸钠晶种添加量的增加,十水碳酸钠的纯度先增加后降低,碳酸钠的脱除率几乎不变。优化工艺条件:降温速率为0.05 ℃/min,晶种添加量为7.5%(以生成结晶产品的质量为基准),冷冻终温为-10 ℃。在优化工艺条件下制备的十水碳酸钠的纯度为96.41%,皂化液的碳酸钠脱除率为81.2%。 相似文献
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氨基酸的不同晶型往往表现出不同的理化性质和药用效果。因此通过调控氨基酸多晶型溶液结晶过程得到目标晶型非常重要,其中添加剂对不同晶型的影响直接且有效,是控制晶型生产常采用的手段。本文综述了不同种类添加剂对氨基酸多晶型溶液结晶过程的影响。首先,以水溶液中不能直接得到的甘氨酸γ晶型为例,阐明了酸、碱和无机盐对其成核的促进作用,从电荷补偿角度分析了该类添加剂对不同晶型生长过程的影响机理。其次,阐述了tailor-made添加剂对氨基酸晶体形态和晶型的调控作用,重点分析了不同结构的tailor-made添加剂对晶型转变的影响规律。介绍了醇-水等混合溶剂对不同氨基酸多晶型结晶过程的选择性影响。最后,在以上分析的基础上,对通过添加剂分子设计制备不同目标晶型进行了展望。 相似文献