> For the complete documentation index, see [llms.txt](https://devdocs.olisystems.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://devdocs.olisystems.com/chemistry-model-files/chembuilder-api/getting-started-with-chembuilder/include-inflows/include-pseudocomponent.md).

# Include Pseudocomponent

Individual pseudocomponents with specific properties can be added to the inflow if distillation data is unavailable. The "type" must be set as "pseudo" to add a pseudocomponent JSON object. Users can customize the pseudocomponent name using the "name" field.

Below is a sample input to add a pseudocomponent to the inflow:

```json
{ 
	"inflows": [
	{
	     "name": "H2O"
	}, 
    	{
            "name": "PSEUDOAA",
            "type": "pseudo",
            "enabled": true,
            "data": {
		"thermodynamicMethod": "API-8",
		"normalBoilingPoint": {
			"unit": "°C",
			"value": 69.0,
			"enabled": true
		},
		"specificGravity": {
			"value": 1.2,
			"enabled": false
		},
		"molecularWeight": {
			"value": 86.0,
			"enabled": true
		},
		"criticalTemperature": { 
			"value": 379,
			"unit": "°C",
			"enabled": true
		},  
		"criticalPressure": { 
			"unit": "atm",
			"value": 217,
			"enabled": true
		}, 
		"criticalVolume": { 
			"unit": "L", 
			"value": 0.057,
			"enabled": true
		}, 
		"acentric": { 
			"value": 0.34,
			"enabled": true
		}
		}
	    } 
	]	
} 
```

<table><thead><tr><th width="182" align="center">Pseudocomponent</th><th width="152" align="center">required</th><th width="133">type</th><th>description</th></tr></thead><tbody><tr><td align="center">name</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2714">✔️</span></td><td>String</td><td>A name provided by the user for this input assay.</td></tr><tr><td align="center">type</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2714">✔️</span></td><td>String</td><td>This field is used to identify the type of inflow. Allowed values include "assay" or "pseudo".</td></tr><tr><td align="center">data</td><td align="center"><span data-gb-custom-inline data-tag="emoji" data-code="2714">✔️</span></td><td>JSON Object</td><td>Contains the user-defined input for an assay.</td></tr></tbody></table>

### Optional Properties

| data                | required | type        |
| ------------------- | :------: | ----------- |
| thermodynamicMethod |    :x:   | String      |
| normalBoilingPoint  |    :x:   | JSON Object |
| specificGravity     |    :x:   | JSON Object |
| molecularWeight     |    :x:   | JSON Object |
| criticalTemperature |    :x:   | JSON Object |
| criticalPressure    |    :x:   | JSON Object |
| criticalVolume      |    :x:   | JSON Object |
| accentric           |    :x:   | JSON Object |

## A few key points to remember are:

{% hint style="info" %}
The "type" must be specified as either "assay" or "pseudo". Otherwise, the species is treated as a regular inflow species.
{% endhint %}

{% hint style="info" %}
The supported thermodynamic methods are `API-8`, `API-5`, `Cavett`, and `Kessler`.
{% endhint %}

{% hint style="info" %}
A minimum of 2 of the folllowing properties "`normalBoilingPoint`", "`specificGravity`", and "`molecularWeight`" are required.
{% endhint %}

{% hint style="info" %}
All supercritical properties are optional and can be disabled.
{% endhint %}

{% hint style="info" %}
The pseudo object and its associated input JSON object can be enabled or disabled using ["enabled" Keyword](/chemistry-model-files/chembuilder-api/supporting-information-for-chembuilder/enabled-keyword.md)
{% endhint %}


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