3 edition of Nucleation, growth, and impurity effects in crystallization process engineering found in the catalog.
Nucleation, growth, and impurity effects in crystallization process engineering
|Statement||Mary Anne Farrell Epstein, editor.|
|Series||AIChE symposium series ;, no. 215, v. 78, AIChE symposium series ;, no. 215.|
|Contributions||Epstein, Mary Anne Farrell, 1939-, American Institute of Chemical Engineers.|
|LC Classifications||TP156.C7 N8 1982|
|The Physical Object|
|Pagination||90 p. :|
|Number of Pages||90|
|LC Control Number||82011460|
Nucleation process is the most important stage in the formation of a crystal and has attracted the attention of researchers due to its importance in many technological and biological contexts. Since the first publication of this definitive work nearly 40 years ago, this fourth edition has been completely rewritten. Crystallization is used at some stage in nearly all process industries as a method of production, purification or recovery of solid materials. Incorporating all the recent developments and applications of crystallization technology, Crystallization gives clear accounts of Reviews: 1.
This could be explained by different mechanisms of the nuclear process. The impurities can occupy the active growth sites to suppress nucleation. Meanwhile, the combination increases the interfacial tension of the nucleus and energy barriers for crystal nucleation. Furthermore, the amount of free water was reduced with the addition of Author: Jing Chen, Jiaoyu Peng, Xingpeng Wang, Yaping Dong, Wu Li. The presence of impurities (non-sugars) in the sugar solution may influence the sucrose crystallization. In fact, impurities in supersaturated solutions significantly affect the nucleation, growth rate, morphology, and also the agglomeration rate of the : Abdelali Borji, Fatima-Ezzahra Borji, Abdelaziz Jourani.
Crystal growth technology involves processes for the production of crystals essential for microelectronics, communication technologies, lasers and energy producing and energy saving technology. A deliberately added impurity is called an additive and in different industries these affect the process of crystal growth. Thus, understanding of interactions between additives and the Author: Keshra Sangwal. Process Engineering Laboratory II Spring Figure 2: Growth and nucleation rates of potassium sulphate in water as a function of supersaturation . both Band Gare in uenced by the supersaturation S[-], where S= c=c s, with c[kmol/m3] the current solute concentration and c sthe equilibrium concentration at the same temper-ature.
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Nucleation, growth, and impurity effects in crystallization process engineering. New York, N.Y.: American Institute of Chemical Engineers, (OCoLC) Material Type: Conference publication: Document Type: Book: All Authors / Contributors: Mary Anne Farrell Epstein; American Institute of Chemical Engineers.
The striking ability of impurities to significantly influence crystallization processes is a topic of paramount interest in the pharmaceutical industry. Despite being present in small quantities, impurities tend to considerably change a crystallization process as well as the final crystalline product.
In the present work, the effect of two markedly different impurities 4-nitrophenol and 4 Cited by: 1. Impurities have a clear negative influence on the nucleation and growth rate kinetics of the semisynthetic antibiotic ampicillin (AMPI) crystallization.
The tested impurities phenylglycine and 6-aminopenicillanic acid are the building blocks of AMPI and will therefore be present in any AMPI manufacturing process, as well as the tested AMPI degradation products.
The nucleation and growth process is a well-accepted model to describe several processes involving the crystallization of a condensed phase. This model can be applied to describe the crystallization Cited by: 1. Other effects exhibited by various parameters (e.g.
impurities, electric or magnetic field) on the growth rate of crystals have been studied too but the present knowledge is rather limited and no theoretical description which might be useful for predictions in mass crystallization is known up to by: CRYSTAL GROWTH Journal of Crystal Growth () North-Holland Effect of impurities on cluster growth and nucleation Rajiv M.
Ginde and Allan S. Myerson Department of Chemical Engineering, Polytechnic University, Brooklyn, New YorkUSA Received 22 June Previous measurements of concentration gradients formed in long columns of supersaturated glycine solutions indicate that small amounts of impurities Cited by: Nucleation and Growth • Important for: Phase transitions, precipitation, crystallization of glasses Many other phenomena • Nucleation has thermodynamic barrier • Initially, large compositional change Small in size • Volume transformations α to β phase transformation Avrami equation Vβ is the volume of second phase V is system volume I.
Key thermodynamic, kinetic and hydrodynamic aspects Key issues The essentials of crystallization are based on nucleation and crystal growth and the factors inﬂu-encing them. Together, these processes govern the CSD by determining the number and size of crystals present in the crystallizer at the end of operation.
Moreover, the effect of small amounts of additives which promote nucleation (e.g. wa plati45,46,47 or P 2 O 5 48,49,50) on the nucleation rates as well as on the crystal growth Cited by: Crystal Nucleation and Growth. For organic crystallization systems, the value of the growth order (g) is typically between 1 and 2 and the value of the nucleation order (b) is typically between 5 and When we plot these equations for a theoretical organic crystallization process the importance of supersaturation becomes clear/5(37).
Crystallization is a very complicated process as it involves many concomitant phenomena such as nucleation, growth, breakage and agglomeration of crystals, and the purity and physical properties.
The influence of solvent and impurities on the structure and growth rates of faces is discussed in the chapter, along with its effect on the incorporation of impurities. The solvent-solute-impurities interactions in solution interact with the interface during the crystallization process.
EFFECTS OF IMPURITIES ON CRYSTAL GROWTH PROCESSES SENDHIL KUMAR POORNACHARY (M. Tech., Indian Institute of Technology Delhi) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMICAL AND BIOMOLECULAR ENGINEERING NATIONAL UNIVERSITY OF SINGAPORE Effects of Impurities on Crystal Growth.
Impurity effects on crystallization. Crystallization of dextrose monohydrate from aqueous solution is a slow process with a high residence time of 24–48 h. In addition, the amounts of dissolved impurities in the aqueous solution have marked effects on the nucleation and growth rate of dextrose crystals, reducing the rate of crystal by: 2.
The dihydrate phosphoric acid production process was simulated in a bench-scale glass reactor. The influences of selected ionic contaminants (Na+, K+, Mg2+, Al3+, F- and Fe3+) on the crystallization of the gypsum byproduct were investigated. Except for fluorine, the presence of the impurities aided gypsum precipitation, with iron and potassium showing the greatest by: A unique text presenting practical information on the topic of nucleation and crystal growth processes from metastable solutions and melts.
Nucleation and Crystal Growth is a groundbreaking text thatoffers an overview and description of the processes and phenomena associated with metastability of solutions and author—a noted expert in the field—puts the emphasis on low Author: Keshra Sangwal.
Physical and chemical properties of crystalline systems activated nucleation crystal growth particle size distribution and population balance attrition and attrition controlled secondary nucleation agglomeration quality of crystalline products design of crystallizers operation of crystallizers challenges in, and an overview of, the control of crystallizers reaction crystallization tailor-made.
In the present work, the effect of two markedly different impurities 4-nitrophenol and 4’-chloroacetanilide on the solubility, nucleation and crystallization of paracetamol are described. This chapter describes the effect of impurities on the metastable zone width (MSZW) and some features of crystallization from melts.
For a survey of the literature prior to on the MSZW of. Crystallization is an important separation and purification process used in industries ranging from bulk commodity chemicals to specialty chemicals and pharmaceuticals.
In recent years, a number of environmental applications have also come to rely on crystallization in waste treatment and recycling Edition: 2. Even on industrial scales with large production rates, crystallization generally remains a molecular-level the growth of each crystal in the supersaturated suspension, molecules or ions incorporate at kinks of steps on the crystal surfaces (see the simplified version in Figure ).These molecular level processes challenge the control over the particulate product from Cited by: Effects of impurities on crystal growth in sucrose crystallization using a photomicroscopic technique L.
D. Shiau* and F. Y. Hsu Dept. of Chemical and Materials Engineering, Chang Gung University Taoyuan, Taiwan, R.O.C The influences of glucose on the growth kinetics of sucrose crystals from aqueous solution.Impingement and classical growth Space is limited so at some point “lucky” nuclei get to touch each other and then prevent subsequent growth When the new grains are filling all the volume, the process of classical growth starts Reminder: ~t1/2 Driving force: minimization of interfacial energy.