Vapor fraction flash

This function calculates the mixture temperature or pressure at a fixed vapor phase mole fraction with respect to inflows i.e. (vapor phase moles/inflow moles)

vapor fraction

POST https://api.olisystems.com/engine/flash/{dbs_file_id}/vapor-fraction

run a fix vapor fraction calculation by varying temperature or pressure

Headers

Name	Type	Description
Authorization	string	Bearer {access_token}
Content-Type	string	application/json

200 Please look at "API call blueprint" page on how to obtain results

{
	"code": 200,
	"data": {
		"file_id": "dee854a6-59db-487d-ad08-a20dee691133",
		"jobId": "f6b3375e-cd0f-4ace-a5ee-71e047b76754",
		"resultsLink": "https://devapi.olisystems.com/result/flash/f6b3375e-cd0f-4ace-a5ee-71e047b76754?context=engine",
		"status": "IN PROGRESS"
	},
	"message": "Process execution started Successfully",
	"status": "SUCCESS"
}

Request payload

{
    "params": {
        "temperature": {
            "value": 30.0,
            "unit": "°C"
        },
        "pressure": {
            "value": 1.5,
            "unit": "atm"
        },
        "vaporMolFrac": {
            "value": 15.0,
            "unit": "mole %"
        },
        "calculatedVariable": "pressure",
        "inflows": {
            "unit": "mol",
            "values": {
                "H2O": 50.0,
                "CO2": 10.0,
                "NACL": 20.0,
                "BENZENE": 10.0
            }
        }
    }
}

params	type	description
temperature	valueObject	specified or initial guess temperature with unit
pressure	valueObject	specified or initial guess pressure with unit
vaporMolFrac	valueObject	specified vapor/inflow by moles with unit
calculatedVariable	string	variable to be calculated, i.e. "temperature" or "pressure"
inflows	object	specified inflow species composition, see Inflows Input

in addition to the inputs shown above some optional properties may also be specified. They can be viewed here

If kinetic reactions are defined in the chemistry model, kinetic calculation inputs are required to be specified. A detailed description can be found here.

Response (status = PROCESSED)

temperature

{
    "code": 200,
    "data": {
        "result": {
            "calculatedVariables": [
                {
                    "name": "temperature",
                    "unit": "°C",
                    "value": 47.055412429605155
                }
            ],
            ...<snip>...
        }
    }, 
    "message": "Results returned successfully", 
    "status": "PROCESSED"
}

pressure

{
    "code": 200,
    "data": {
        "result": {
            "calculatedVariables": [
                {
                    "name": "pressure",
                    "unit": "atm",
                    "value": 0.7060155068553384
                }
            ],
            ...<snip>...
        }
    }, 
    "message": "Results returned successfully", 
    "status": "PROCESSED"
}

The output of this calculation is the stream output which is common result output for all OLI's flash calculations or an error. In addition to this output the result also contains the solution temperature/pressure which can be conveniently retrieved from the data.result.calculatedVariable array

data.result.calculatedVariable [ { } ]	type	description
name	string	name of the calculated variable, i.e. temperature or pressure as specified in JSON input params.calculatedVariable
value	number	value of the calculated variable
unit	string	unit of the calculated variable, which is the same as specified in the input initial guess, i.e. params.temperature.unit/params.pressure.unit in input

Survey Calculation

Survey calculation is supported for the variables below. Please refer to Survey calculation for explained input schema.

supported params.surveyInputs[{}].field

"/params/temperature/value"

"/params/pressure/value"

"/params/vaporMolFrac/value"