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The Simsci PRO/II process simulation program is widely used for ensuring strict mass and energy balances in chemical processes. SIMSCI is a leading provider of industrial application software and related services. These software are widely used in industries such as petroleum, petrochemicals, industrial chemistry, as well as in fields related to engineering and manufacturing. The software products designed by SIMSCI can reduce users’ costs, improve efficiency, enhance product quality, and strengthen management decision-making. PRO/II is suitable for industries such as oil/gas processing, refining, chemicals, chemical engineering, construction, polymers, and fine chemicals/pharmaceuticals. It is primarily used to simulate the design of new processes, evaluate changes in plant configurations, improve existing plants, conduct assessments and certifications in accordance with environmental regulations, eliminate bottlenecks in plant operations, and optimize and enhance plant productivity and efficiency. Functions and features of PRO/II: Since it was introduced to China in the 1980s, the PROII software has received positive feedback from numerous users and delivered excellent results. In particular, its unique functions and features are better demonstrated by its use in large petrochemical and chemical engineering design institutes. These units include: Beijing Petroleum Refining Design Institute BDI, Petrochemical Beijing Engineering Company BPEC, Huanyu Institute, Tianchen Institute (acquired in 2000), Jihua Institute (acquired in 2000), Fushun Institute, Wushihua Institute, Daqing Oilfield Institute, Daqing Natural Gas Company, and dozens of other units (acquired in recent years). I. Domestic Application Status 1. The newly released PROIIV5.5 in May 2001 saw significant improvements in functionality, offering online simulation capabilities. 2. In terms of practicality, PROII has advantages over other similar software; its development approach is tailored for the oil refining and chemical industry. The calculation models developed by SIMSCI have become international standards, and the company has a team of technical experts available for after-sales support, enabling them to address any difficulties encountered by users – an aspect in which it outperforms other software companies ； The manual contains numerous practical examples ； Make the software easier for users to use. This has been recognized by the institutions. 3. PROII features standard ODBC interfaces, which allow it to be connected to heat exchanger calculation software or other large-scale computing software; in addition, it can also be connected to WORD, EXCEL, and databases, with the calculation results available in various output formats. 4. Organizations that previously used the ASPEN software, such as BPEC, BDI, the First Chemical Engineering Institute (Tianchen), and Global Company, consider PROII to be more practically useful for engineering purposes. Some chemical and petrochemical institutes are preparing to purchase the PROII software. II. Software Functional Features
Applicable industries: Oil/gas processing, refining, chemicals, chemical engineering, construction, polymers, fine chemicals/pharmaceuticals.
Simulation applications: Designing new processes, evaluating changes in plant configurations, improving existing plants, conducting assessments and certifications in accordance with environmental regulations, eliminating process bottlenecks, optimizing and enhancing plant productivity and efficiency.

Typical chemical process models in PRO/II: Ammonia synthesis, azeotropic distillation and extractive distillation, crystallization, dehydration processes, inorganic processes, liquid-liquid extraction, phenol distillation, solid handling.

Polymers: Radical polymerization, general-purpose polymerization (styrene), low-density polymerization (ethylene), polymerization of methyl methacrylate, polymerization of vinyl acetate, chain-growth polymerization, polyesters, amides – nylon 6, nylon 6/6, nylon 6/12, copolymerization, polymerization of styrene-methyl methacrylate, polymerization of ethylene-vinyl acetate.

Refining: Crude oil preheating, atmospheric distillation, vacuum distillation columns, FCC main fractionation columns, coke ovens, gas processing units, gasoline stabilization, naphtha separation and stripping, reactive distillation, shift and methanation reactors, acid-water separators, sulfur and HF alkylation, isobutane removal columns.

Chemicals: Ethylene separation columns, C3 separation columns, aromatic hydrocarbon separation columns, cyclohexane plants, MTBE separation and production facilities, naphthalene conversion, olefin production, oxidation processes, propylene chlorination.

Gas processing: Amine desulfurization, multi-stage refrigeration, compressor units, deethanization and demethanization columns, expansion devices, gas dehydrogenation, hydrate formation/inhibition, multi-stage operations, platform operations, refrigeration circuits, turbine expansion optimization.

Pharmaceuticals: Batch distillation, batch reactions.

Generalized flashing models: Flashing, valves, compressors/expansion machines, pumps, pipelines, mixers/separators.

Distillation models: Inside/out, SURE, CHEMDIST algorithms, two/three-phase distillation, four-point estimators, electrolytes, reactive distillation and batch distillation, simplified models, liquid-liquid extraction, design and calculation of packed columns, design and calculation of tray columns, thermosyphon reboilers.

Heat exchanger models: Shell-and-tube, simple, and LNG heat exchangers, zone analysis, heating/cooling curves.

Reactor models: Conversion and equilibrium reactions, plug flow reactors, continuous stirred-tank reactors, online FORTRAN reaction kinetics, Gibbs free energy minimization, shift and methanation reactors, kettle-type reactors, Profimatics reformer and hydrogenator model interfaces, batch reactors.

Polymer models: Continuous stirred-tank reactors, plug flow reactors, wiped-film evaporators.

Solid models: Crystallizers/dissolvers, counter-current decanters, centrifugal separators, rotary filters, dryers, solid separators, cyclones.

Component databases: A database of over 2,000 pure components, a database based on DIPPR, information on solid properties, a database of over 1,900 component/type electrolytes, non-database components, virtual components and property descriptions, user-defined databases, property determination based on structure, combination of multiple tests, Van Krevelen method for polymers.

Mixtures data: Online binary parameters for over 3,000 VLE binary systems, online binary parameters for over 300 LLE binary systems, 2,200 online azeotic mixture data sets for parameter estimation, specialized data packages, alcohol dehydration, natural gas dehydration, data related to triethylene glycol, acid-water data from GPA (GPSWAT), treatment of gaseous and liquid ammonia, thiols.

In addition to the basic package, PROII also provides users with the following modules:
Interface module: *HTFS, PRO/II-HTFS Interface – automatically retrieves property data for streams from the PRO/II database and uses this data to create an HTFS input file. HTFS can then output this file to access various logistics property data. * HTRI and the PRO/II-HTRI Interface retrieve data from the PRO/II database and create an HTRI input file for various HTRI programs. The property distribution table for mass flow rates, derived from the thermophysical property calculations in PRO/II, is provided to HTRI’s sophisticated heat exchanger design program. This reduces the repetition of entering data between the two programs. * Linnhoff March: The precise quality and energy balance results from PRO/II can be transferred to the SuperTarget™ tower module to analyze the energy efficiency of the entire separation process. The proposed improvement plan can then have its values determined in subsequent PRO/II runs. Application modules * Batch, stirred-tank reactors, and batch distillation models can operate independently or as part of a regular PRO/II process. The operations can be described through a series of procedures, offering great flexibility. * Electrolytes: This module makes use of the sophisticated electrolyte thermodynamics algorithms developed by OLI Systems, Inc. As part of this module, the electrolyte application package further expands certain functions, such as generating user-specific electrolyte models and creating and maintaining a private class database. * Polymers can simulate and analyze industrial polymerization processes, ranging from monomer purification and polymerization reactions to separation and post-treatment. The uniqueness of PRO/II lies in its ability to describe polymer composition through a series of average molecular weight fractions, allowing for accurate simulation of polymer mixing and fractionation. * Profimatics, KBC Profimatics reformer and hydrogenator models have been added to PRO/II unit operations. What makes PRO/II unique is that the base component and thermodynamic property data modified by these reactions are automatically entered. New features in PRO/II V6: 1. GCO units and thermal interfaces; 2. Integration of DB Robinson’s AMSIM V7 method; 3. Interface with HTRI *ST programs; 4. Advanced air-cooler model; 5. Heating furnace model; 6. Membrane separator unit; 7. Polymer electrolyte cell model; 8. Graphical user interface data interface for SHORTCUT; 9. Hotkey support for commands related to heat curves, hydrides, and phase diagrams; 10. Ability to define dynamic and static columns; 11. Default specifications for columns included in the configuration; 12. FRI function for column hydrodynamics; 13. Option for users to add their own subroutines; 14. Possibility to add reflux pumps to columns in the flow diagram; 15. Data window for unit operations and units; 16. Ability to copy and paste unit operations; 17. Flow diagrams can be exported to AutoCAD; 18. Flow diagrams can also be exported to Zyqad; 19. Upgradable OLE function documentation; 20. Links to the Dechema website; 21. Electrolyte upgraded to OLI version (currently V6.5); 22. Additional transport property methods; 23. Updated component database with links to DIPPP801; 24. GUI display of component property parameters (petroleum, non-lib, estimated values); 25. Unit of measurement for Wobbe index; 26. Automatic file conversion available in the File/Open menu; 27. Updated material flow reports; 28. Real gas pressures included in material flow reports; 29. Data validation window with units displayed on the material flow line; 30. Keyword output for batch distillation; 31. Option to save printing settings; 32. Print preview function; 33. Improved batch distillation reports; 34. Access to menus for all PES products. III. Division of software functional modules: 1. PROII basic package: PROII is a comprehensive software package that can meet the requirements for simulating and analyzing processes in integrated petrochemical plants. For details on its modeling capabilities, refer to the PROII documentation in both Chinese and English. 2. Additional modules, which are divided into interface modules and application modules. Interface module: HTFS: Automatic retrieval of logistics property data ； HTRI: Heat exchange design program ； Linnhoff March: Analyze the energy efficiency of the entire separation process. Application module: BATCH: Stirred-tank reactor and batch distillation model ； Electrolytes: Thermodynamic models of electrolytes ； Polymers: Polymer models ； Profimatics: Reforming hydrogenation model. Note: For a detailed introduction to the functions of the application modules, please refer to the accompanying materials. IV. Technical Support and After-Sales Service 1. Technical discussions in the preliminary stage of software introduction ； 3. Business cooperation in the software introduction process ； 4. Domestic technical training ； Location: Beijing ； If training is conducted at the user’s location, the costs for transportation and accommodation are borne by the user ； 5. Provide foreign technical training, including: handling departure procedures; fees are additional ； 6. Assist in carrying out the computational analysis for actual engineering projects ； Cost is additional ； 7. One-year free software upgrade provided ； One-year technical support, including: hotline, EMAIL, and fax ； 8. Provide a user manual in Chinese for Chinese speakers ； 9. Provide opportunities for the exchange of application technology experience with domestic users.