PROCESS ECONOMICS PROGRAM
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1 PROCESS ECONOMICS PROGRAM SRI INTERNATIONAL Menlo Park. California Abstract Process Economics Program Report No. 56A UREA (January 1981) The market for urea is growing rapidly worldwide principally because It is being used increasingly to replace ammonium nitrate as the primary source of solid nitrogen In fertilizers. Processes for manufacturing urea continue to change because of restraints imposed by higher energy costs, environmental regulations, and other economic factors. This report presents updated process designs and economic evaluations for plants to produce 1,500 short tons/day of prilled urea. Economics for the three most popular processes are given, including those for half-sized and double-sized plants. Pollution abatement procedures are treated In particular detail. Manufacturing techniques and new developments are reviewed and patent summaries are presented on these and related processes as well as on processes for manufacturing granular urea. PEP '79 JLC
2 Report No. 56A UREA SUPPLEMENT A by JOHN L. CHADWICK January 1981 A private report by the PROCESS ECONOMICS PROGRAM Menlo Park, California 94025
3 For detailed marketing data and information, the reader is referred to one of the SRI programs specializing in marketing research. The CHEMICAL ECONOMICS HANDBOOK Program covers most major chemicals and chemical products produced in the United States and the WORLD PETROCHEMICALS Program covers major hydrocarbons and their derivatives on a worldwide basis. In addition, the SRI DIRECTORY OF CHEMICAL PRODUCERS services provide detailed lists of chemical producers by company, prod- uct, and plant for the United States and Western Europe. ii
4 CONTENTS INTRODUCTION SUMMARY... 3 Process Comparisons... 5 Technical Considerations... 8 New Process Introduced... 9 New Process Concepts INDUSTRY STATUS Urea in the United States Urea in Canada Urea in Latin America Urea in Western Europe Urea in Eastern Europe, Including the USSR Urea in Africa Urea in Asia Urea in Oceania CHEMISTRY REVIEW OF TECHNICAL DEVELOPMENTS Stripping Processes Conventional Processes Reactor Conditions Isobaric Double Recycle Process Heat Recycle Urea Process Summary of Patents Feed Preparation Granulation New Concept in Urea Processes Waste Treatment of Process Condensate Commercial Hydrolysis Processes Other Methods for Treating Condensate UREA BY THE CARBON DIOXIDE STRIPPING PROCESS Process Developments Process Description Process Discussion Synthesis Section Evaporation and Prilling Section iii
5 6 UREA BY THE CARBON DIOXIDE STRIPPING PROCESS (Continued) Storage... Pollution Abatement Section.... Cost Estimates... Capital Costs.... Production Cost and Product Value UREA BY THE AMMONIA STRIPPING PROCESS.... Process Developments... Process Description.... Process Discussion... High Pressure Synthesis Loop... Purification and Recovery Section.... Concentration and Prilling Section... Wastewater Treatment Section... Cost Estimates.... Capital Costs.... Production Cost and Product Value UREA BY THE BASE (CONVENTIONAL) PROCESS... Commercial Process Developments.... Process Research... Process Description.... Process Discussion... Cost Estimates... Capital Costs.... Production Cost and Product Value.... APPENDIX A DESIGN AND COST BASES.... APPENDIX B SAFETY, HANDLING, AND POLLUTION CONTROL CITED REFERENCES iv
6 ILLUSTRATIONS Urea Pan Granulation (Norsk Hydro Technology) , Waste Water Treatment Flow sheet.,.. q Montedison's New IDR Urea Process Flow Diagram of the Heat Recycle Urea Process (Technip/SD Technology) Fluidization Granulation Process for Urea ('Mitsui Toatsu Technology) Biological Treatment of Urea Process Condensate Urea by CO2 Stripping Process Flow sheet , Urea by CO2 Stripping Process CO2 Compressor Train , Urea by CO2 Stripping Process Effect of Raw Material Cost on Product Value Urea by CO2 Stripping Process Effect of Operating Level and Plant Capacity on Production Cost Urea by NH Stripping Process Plowsheet... Urea by NH Stripping Process CO2 Compressor Train..., Urea by NH Stripping Process Effect of Raw Material Cost on Product Value Urea by NH Stripping Process Effect of Operating Level and Plant Capacity on Production Cost V
7 ILLUSTRATIONS 8.1 Flow sheet....., Steam Turbine Drives for Compressors and Pumps Effect of Raw Material Cost on Product Value Effect of Operating Level and Plant Capacity on Production Cost Vi
8 TABLES Summary of Economics Comparative Evaluation Factors World Urea Trends World Capacity for Making Urea, by Region U.S. Urea Supply U.S. Urea Plants and Capacities (1980 Year-End) Urea Capacity, Latin America Urea Capacity, Western Europe Urea Capacity, Eastern Europe Urea Capacity, Africa Urea Capacity, Asia Summary of Mavrovic Urea Patents Summary of Urea Patents in General (patents assigned to Mitsui Toatsu, Stamicarbon, Snamprogetti and Mavrovic are not included in this table).. 34 Synthesis Loop Summary of Stamicarbon Urea Patents Urea by the CO2 Stripping Process Major Equipment Urea by the CO2 Stripping Process Utilities Summary Urea by the CO2 Stripping Process Stream Flows Vii
9 TABLES 6.6 Urea by the CO2 Stripping Process Reactor Design Conditions Urea by the CO2 Stripping Process Total Capital Investment Urea by the CO2 Stripping Process Capital Investment by Section Urea by the CO2 Stripping Process Production Costs Urea by the CO2 Stripping Process Direct Operating Costs by Section (Thousand $/yr) Summary of Snamprogetti Urea Plants Urea by NH Stripping Process (Suamprogetti Technology) Major Equipment Urea by NH Stripping Process Utilities Summary Urea by NH Stripping Process Stream Flows Urea by NH Stripping Process (Snamprogeatti Technology) Reactor Design Conditions Urea by NH Stripping Process Total Capital Investment Urea by NH Stripping Process Capital Investment by Section Urea by RR Stripping Process Production Costs viii
10 TABLES Urea by RR Stripping Process Direct Operating Costs by Section (Thousand $/yr) Summary of Mitsui Toatsu Urea Patents Major Equipment , Utilities Summary , Stream Flows Reactor Design Conditions , Total Capital Investment Capital Investment by Section Production Costs Direct Operating Costs by Section (Thousand $/yr) ix
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