Progress in Continuous Fractional Crystallization

Arkenbout, G. J.; Kuijk, Anke; Smit, W. M.

doi:10.1007/978-1-4615-7258-9_41

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Compressor inlet and outlet steam lines should consider the loss of steam and the condensation of steam during the transportation process. Condensate collection and drainage devices should be installed in the pipeline [18]. The water spray cooling device designed for the compressor outlet usually has a large amount of water spray, and the design of the condensed water and excess cooling water collecting and discharging device here is more important.…”

Section: Industrial Operation Results and Analysismentioning

confidence: 99%

Heat Pump Evaporation Crystallization Technology of Salt-containing Phenol Wastewater

Xiantao¹,

Ran²,

Chen³

et al. 2019

AJWSE

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China is a large country in the production and use of pesticides, and the production and use of pesticides are among the highest in the world. According to statistics, the ratio of wastewater from pesticide production to wastewater discharged is about 1:100. Arbitrary discharge of a large amount of pesticide wastewater has caused serious environmental problems. The main way of pesticide wastewater treatment is to optimize emission reduction and control emissions. At present, treatment is the main way. There are many kinds of pesticide wastewater, which need targeted treatment, greatly increasing the difficulty of treatment. This paper takes the salty waste phenol wastewater discharged from a pesticide factory as the carrier, through basic physical property analysis, thermal property detection, crystallization kinetics research, basic small test, pilot scale amplification, research and development for the evaporation of this wastewater, crystallization processing equipment. In order to optimize the process route, it is preferable to use MVR compressor technology in comparison with multi-effects. Under the conditions of evaporation temperature 75°C to 90°C, compare the parameters of compressor power, cooling water volume, total energy consumption of evaporation crystallization device, total area, etc., and determine the evaporation temperature to be 90°C. In order to improve the energy utilization rate, the heat such as condensed water, crystal slurry output, and mother liquor reflux is rationally utilized. The multi-stage plate preheater and plate evaporator are used in the equipment design. The separator and condensed water vapor-liquid separation device adopt the patented structure to improve the operation efficiency.

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Section: Industrial Operation Results and Analysismentioning

confidence: 99%

Heat Pump Evaporation Crystallization Technology of Salt-containing Phenol Wastewater

Xiantao¹,

Ran²,

Chen³

et al. 2019

AJWSE

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“…Before the model is formulated, some assumptions should be made: (1) The column crystallizer has attained thermal equilibrium. ( 2 Theoretical studies were conducted on the purification section as shown in Figure 1.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…As a result of these demands, melt crystallization as a separation and purification method of high efficiency and low energy consumption is attracting greater attention. 1 Furthermore, many close-boiling isomers that require separation are becoming increasingly important as raw materials for products such as plastics, fibers, and rubbers, and melt crystallization is the only industrially feasible separation method for such materials, as they cannot be separated economically by distillation or extraction because of their low relative volatilities, close solubilities, or sensitivity to small increases in temperature during processing. 2,3 Although the separation effect of a single crystallization might be very competitive, high purity and large yield can usually not be obtained in one step, and multistage crystallization is required to achieve these goals.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Investigation of the Purification Process of Organic Materials in a Continuous Inclined Column Crystallizer

Liang

Matsuoka

2006

Ind. Eng. Chem. Res.

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With the acrylic acid−propionic acid solid solution system, the purification process of organic materials in an inclined column crystallizer under continuous flow and at steady state was investigated. The influences of suspension density and reflux ratio on the separation and purification performance of the inclined column crystallizer are discussed. A simplified axial dispersion model for the purification section of an inclined column crystallizer is developed. The results of this study show that the suspension density is the most effective factor for the separation and purification performance of an inclined column crystallizer and that the product purity increases with suspension density. The reflux ratio is also an effective parameter for the separation and purification performance of an inclined column crystallizer, with the product purity increasing with reflux ratio for a given suspension density. The simplified axial dispersion model satisfactorily explains the concentration profile of the continuous inclined column crystallizer at steady state.

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“…Industrial naphthalene from coal tar accounts for 85% of total naphthalene production in the world [5] , and it is raw material for refined naphthalene. Removing thionaphthene from industrial naphthalene is very difficult for they have almost the same boiling point, therefore, regular distillation method does not work well [6] . While the melting point for industrial naphthalene and thionaphthene differs significantly; so crystallization method is an effective and prospective method to refine industrial naphthalene with removing thionaphthene.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Study of Refined Naphthalene Production with Fractional Crystallization

Gao

Zhang³

et al. 2012

AMR

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In order to obtain optimized operating condition for industry naphthalene purification using fractional crystallizing method, the influence of heating rate, crystallizing times, holding time and cooling rate on the yield and purity of industrial naphthalene were studied. The industrial naphthalene from AISC Chemical General tar workshop was used as starting material in the study. The results show that the yield and purity of refined naphthalene can achieve 94.2％ and 99.30％ respectively, when the heating rate is 1.2°C/h, the cooling rate is 3°C/h, holding time is 5 hours and the crystallizing times is 3. The result of present study provides a theoretical foundation for the actual production and technology improvement of naphthalene purification.

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Progress in Continuous Fractional Crystallization

Cited by 7 publications

References 9 publications

Heat Pump Evaporation Crystallization Technology of Salt-containing Phenol Wastewater

Heat Pump Evaporation Crystallization Technology of Salt-containing Phenol Wastewater

Experimental and Theoretical Investigation of the Purification Process of Organic Materials in a Continuous Inclined Column Crystallizer

Preliminary Study of Refined Naphthalene Production with Fractional Crystallization

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