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Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
During this reporting period, major activities were continued on process system properties, chemical engineering and economic analyses for application to alternate processes under consideration for solar cell grade silicon. In Task 1, primary efforts were devoted to properties of silicon source materials. For silane, liquid viscosity data were correlated as a function of temperature to cover the entire liquid range. Estimates for gas and liquid thermal conductivity are reported. For Task 2, major efforts were devoted to preliminary process design for the conventional polysilicon process based on the rod reactor (hairpin) technology. The criteria for design were selected to be commensurate with the design basis for the alternate processes to produce solar cell grade silicon. Chemical engineering analysis activities in Task 2 also focused on preliminary process design for a silane (SiH/sub 4/) plant. A revised flowsheet received from Union Carbide has received a preliminary review, and process design has been reinitiated. In Task 3, preliminary cost analysis is in progress for the conventional polysilicon process used in the United States and Europe for the production of semiconductor grade polysilicon. Plant investment and product cost estimates will be determined upon completion of review of major process equipment and production labor requirements.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
During this reporting period, major activities were continued on process system properties, chemical engineering and economic analyses for application to alternate processes under consideration for solar cell grade silicon. In Task 1, primary efforts were devoted to properties of silicon source materials. For silane, liquid viscosity data were correlated as a function of temperature to cover the entire liquid range. Estimates for gas and liquid thermal conductivity are reported. For Task 2, major efforts were devoted to preliminary process design for the conventional polysilicon process based on the rod reactor (hairpin) technology. The criteria for design were selected to be commensurate with the design basis for the alternate processes to produce solar cell grade silicon. Chemical engineering analysis activities in Task 2 also focused on preliminary process design for a silane (SiH/sub 4/) plant. A revised flowsheet received from Union Carbide has received a preliminary review, and process design has been reinitiated. In Task 3, preliminary cost analysis is in progress for the conventional polysilicon process used in the United States and Europe for the production of semiconductor grade polysilicon. Plant investment and product cost estimates will be determined upon completion of review of major process equipment and production labor requirements.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Major activities period centered on process system properties, chemical engineering and economic analyses. In analyses of process system properties, major efforts focused on properties of silicon tetrachloride which is the source material for several alternate processes under consideration for solar cell grade silicon production. The status and progress are reported for physical, thermodynamic and transport property data. Experimental determination of gaseous thermal conductivity of silicon source materials was continued. For chemical engineering analyses, the preliminary process design for the original silane process was completed for Cases A and B, Regular and Minimum Process Storage. Included are raw material useage, utility requirements, major process equipment list, and production labor requirements. The preliminary process design results for Cases A and B were used for economic analyses.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
During this reporting period, major efforts were expended on process system properties, chemical engineering, and economic analyses. In Task 1, primary activities were devoted to properties analyses of silicon source materials and silicon tetrafluoride investigation. Experimental data were identified for critical temperature and pressure for silicon tetrafluoride. Major chemical engineering analysis activities in Task 2 were devoted to preliminary process design for a 1000 metric ton/yr plant (solar cell grade silicon) based on the Zn/SiCl4 process (Battelle). In Task 3, economic analysis activities were continued including survey results for product cost estimation techniques. Nominal values--product cost subitems for application to alternate processes--were selected. Economic results based on the preliminary process design are presented for the Zn/Sicl4 process. Capital investment (fixed) was determined at $10,100,000 for the 1000 metric/tons year plant. Total product cost was estimated at $9.49 per kg of silicon. (WDM).
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Major activities during this reporting period were focused on process system properties, chemical engineering and economic analyses. Analyses of process system properties were continued for silicon course materials under consideration for solar cell grade silicon including data collection, analysis, estimation and correlation. Initial correlation efforts focused on vapor pressure data which are extremely important in phase equilibria in a chemical plant processing silicon source materials. The vapor pressure of silicon tetrachloride as a function of temperature was correlated by the relation log P/sub v/ = A + B/T + C log T + DT + ET/sup 2/. Values for the correlation constants A, B, C, D and E are presented. Correlation results for gas phase heat capacity of silicon tetrachloride C/sub p/ + A + BT + CT/sup 2/ + DT/sup 3/ are presented including data from American, Russian, German and Japanese sources. The apparatus for measuring thermal conductivity of gases was assembled and calibrated. Chemical engineering analysis was continued on the silane process (Union Carbide). The review and modification of the preliminary process design for the conventional polysilicon process were completed, and results are presented. Cost analysis activities for the production of semiconductor grade polysilicon via the conventional hair pin process technology were continued. Results are presented.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Major activities focused on process system properties, chemical engineering and economic analyses during this reporting period. Analysis of process system properties was continued for silicon source materials. Primary efforts centered on data collection, analysis, estimation and correlation. Property data for silicon tetrachloride are reported for critical constants (temperature, pressure, volume, compressibility factor); vapor pressure; heat of vaporization; gas heat capacity and liquid heat capacity. Silicon tetrachloride is the source material in several processes under consideration for solar cell grade silicon production. Final experimental values for gas phase thermal conductivity of the silicon source materials silane, dichlorosilane, trichlorosilane, tetrachlorosilane, and tetrafluorosilane are reported in the temperature range 25 to 350°C. These final values reflect a refinement of previously reported preliminary values after complete calibration of the temperature measuring apparatus. Chemical engineering analysis of the Union Carbide silane process (Case C-Revised Process) was continued with primary efforts being devoted to the preliminary process design. Status and progress are reported for base case conditions, process flow diagram, reaction chemistry and equipment design. Current engineering design is in progress for the several distillation columns which separate the liquid chlorosilanes and provide purified silane product.
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Author: Lamar University. Chemical Engineering Department
Author: Lamar University. Chemical Engineering Department
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Author: Lamar University. Chemical Engineering Department
Author: Lamar University. Chemical Engineering Department
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