This article is concerned with the numerical investigation of one-dimensional population balance models for batch crystallization process with fines dissolution.In batch crystallization,dissolution of smaller unwanted...This article is concerned with the numerical investigation of one-dimensional population balance models for batch crystallization process with fines dissolution.In batch crystallization,dissolution of smaller unwanted nuclei below some critical size is of vital importance as it improves the quality of product.The crystal growth rates for both size-independent and size-dependent cases are considered.A delay in recycle pipe is also included in the model.The space–time conservation element and solution element method,originally derived for non-reacting flows,is used to solve the model.This scheme has already been applied to a range of PDEs,mainly in the area of fluid mechanics.The numerical results are compared with those obtained from the Koren scheme,showing that the proposed scheme is more efficient.展开更多
The essential oil composition leaves of Juniperus communis L., Taxus canadensis Marshall. and Tsuga canadensis （L.） Carr. from Canada were investigated by head space solid phase microextraction （HS-SPME） and gas c...The essential oil composition leaves of Juniperus communis L., Taxus canadensis Marshall. and Tsuga canadensis （L.） Carr. from Canada were investigated by head space solid phase microextraction （HS-SPME） and gas chromatography/mass spectrometry （GC-MS）. Thirty-three, thirty and thirty-one components were identified representing 95.78%, 93.89%, 96.14% of the oil, respectively. Limonene （26.12%）, benzene （15.62%）, 13-mrycene （9.08%） and β-pinene （7.30%） were found to be the main constituents of J. communis; 1-propanone （36.38%）, morpholine （10.95%）, methylamine （9.10%） and methanone （8.14%） were detected main components of Taxus canadensis; bornylacetate （26.84%）, α-pinene （23.74%）, camphene （11.93%） and limonene （6.02%） were determined as major constituents of Tsuga canadensis. The chemical distributions of the essential oil compounds in the genus pattern were discussed in means of chemotaxonomy and natural products.展开更多
文摘This article is concerned with the numerical investigation of one-dimensional population balance models for batch crystallization process with fines dissolution.In batch crystallization,dissolution of smaller unwanted nuclei below some critical size is of vital importance as it improves the quality of product.The crystal growth rates for both size-independent and size-dependent cases are considered.A delay in recycle pipe is also included in the model.The space–time conservation element and solution element method,originally derived for non-reacting flows,is used to solve the model.This scheme has already been applied to a range of PDEs,mainly in the area of fluid mechanics.The numerical results are compared with those obtained from the Koren scheme,showing that the proposed scheme is more efficient.
文摘The essential oil composition leaves of Juniperus communis L., Taxus canadensis Marshall. and Tsuga canadensis （L.） Carr. from Canada were investigated by head space solid phase microextraction （HS-SPME） and gas chromatography/mass spectrometry （GC-MS）. Thirty-three, thirty and thirty-one components were identified representing 95.78%, 93.89%, 96.14% of the oil, respectively. Limonene （26.12%）, benzene （15.62%）, 13-mrycene （9.08%） and β-pinene （7.30%） were found to be the main constituents of J. communis; 1-propanone （36.38%）, morpholine （10.95%）, methylamine （9.10%） and methanone （8.14%） were detected main components of Taxus canadensis; bornylacetate （26.84%）, α-pinene （23.74%）, camphene （11.93%） and limonene （6.02%） were determined as major constituents of Tsuga canadensis. The chemical distributions of the essential oil compounds in the genus pattern were discussed in means of chemotaxonomy and natural products.
