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Emission Master® 8

Basic Application Description

This program calculates VOC emissions for batch and continuous processes using computerized E.P.A. techniques.  Available 'MACT' models include filling, purging, heating, depressurization, vacuum, and solids drying.  Interactive chemical and vapor pressure databases are provided for modeling multi-phase liquid mixtures.  If vapor pressure modeling coefficients are not available for new chemical entries, then coefficients may be calculated from experimental vapor pressure data using a special utility contained in the program.  Emission Master generally complies with all documented models that are contained in most EPA guidance documents. 


'Chapter 16 - Methods for Estimating Air Emissions from Chemical Manufacturing', August 2007.  Visit the EPA web site http://www.epa.gov/ttn/chief/eiip/techreport/volume02/ for additional information. 


The user may combine one or more of the available models in any order to create a complete process recipe which can then be saved and opened at a later time.  Once a process recipe has been saved it may then be reopened for subsequent changes or it may be combined with other process recipes.  The calculated air emissions are displayed for each model in the users interface and they may be exported to a file or printed for review. 


Available Processing Models

Charging Calculate emissions resulting from material charges into a process vessel. 
Transfer Calculate emissions that result from liquid transfers into a process vessel. 
Normal Gas Sweep Estimate process emissions when an inert gas such as nitrogen is used to inert the vessel containing volatile solvents. 
Empty Vessel Purge Estimate solvent vapor losses when a gas such as nitrogen is used to clear an empty vessel of . 
Heating Vent losses from the vessel's gas space are computed for when a batch is heated to a higher temperature. 
Depressurization Emissions will occur as a process vessel is being placed under vacuum. 
Vacuum Operation Once at vacuum conditions, the objective is to maintain vacuum through the process  operation.  Vent losses stemming from vacuum leaks in the equipment may be estimated. 
Gas Evolution Calculate process emissions which result when a reaction off-gas is generated. 
Reaction Implement a compositional change within the process. 
Solids Drying Determine solvent losses from drying operations involving air transport style dryers. 
Holding/User Defined For specifying periods where the batch is not actively undergoing processing then the user may using this model for documenting cycle time when emissions did not take place.  Additionally, the user may use this model for specifying known emissions from sources other than the available process models as provided by Emission Master. 
Fixed Roof Storage Tank The program provides for emission modeling for fixed roof storage tanks as defined by the Tanks 4.0 program.  Storage tanks can be horizontal, vertical dome top, vertical cone top, and isothermal (underground or temperature controlled). 



Chemicals Database Contains over 110 commonly used chemicals and is readily expandable by the user.  Vapor pressure model coefficients for either the Antoine, Clapeyron, or Riedel equation.  If required, modeling coefficients for the Antoine and Clapeyron equations may be estimated from available vapor pressure data.  The program also supports a basic vapor pressure data table. 
Equipment Database Contains process equipment records including reactors, holding tanks, and storage tanks that have been entered by the user. 
Controls Device Database Contains frequently used control devices such as condensers, scrubbers, vacuum pumps, vacuum steam jets, and other general purpose devices. 
Inert Gases Database.  Stores common noncondensable gases such as air, nitrogen, argon, etc., for quick access from the purge model. 
Vent Path Database.  Stores commonly used vent path configurations including vessel, control device, and Vent ID for convenient access within the program. 
Database Security Database records are initially owned by the person that creates them.  The owner of a database record can make the record public so that others may gain access and/or edit the record  Any user may take ownership of a public record. 



Several tools are available in Emission Master to help with different tasks for making changes across the entire process model or only a few.  Here is a list of some of the tools that are available. 

Recalculate Activities - Each process activity is calculated in place without impacting the next activity to follow in the recipe.  As each process activity is recalculated, the previously calculated emission data is replaced. 
Recalculate Process (Cascade Changes) - Each process activity is calculated and the previously calculated emission data is replaced.  Unlike the Recalculate Activities tool, the resulting batch composition from each process activity is copied to the beginning of the next process activity.  For example, if the user changes the amount of Methanol that is charged during process activity #4 then the amount of Methanol in the process will be reflected in subsequent steps of the recipe. 
Scale Process - Change the batch size of the current process using a single scale factor.  All charge quantities are scaled using the factor that is entered by the user. 
Swap Compounds - Swap out basic chemicals and solvents that have been are used in the process with other chemicals and solvents.
Insert Process - Insert smaller standardized Emission Master processes into the currently loaded process model. 
Import Storage Tank Activities - Create an Emission Master file containing one or more storage tank models by reading basic modeling data in Excel.  
Control Device Exception Scenario - Analyze one or more processes for when a control device in the factory experiences a failure. 
Vent Path Changer - Reconfigure the vent path of a vessel for all process activities that meet a user defined filter criteria. 



Standard Emission Report - Emissions for each process activity are output in a consolidated report in rich text format. 
Extended Emission Report - Emissions for each process activity are output in an extended report including vessel and control device emissions in rich text format.
Title & Summary Report - An abbreviated report showing only the Title Page and Summary Page information in rich text format.
Vent ID Report - A report where emissions are grouped by Vent ID. 
Emission Summary Report - A report showing Summary Page emission data in rich text format.
Emission Category Report - A report showing emissions which have been grouped by compound category in rich text format.
Emissions Analysis in Excel - A comprehensive report consisting of an Excel workbook.  Individual worksheets include emission summary, classified emission summary, vent paths, uncontrolled emissions, controlled emissions, and process recipe. 


Other Resources

·Emission Master File Types
·Conversion Units