ethane
Enable an agent to identify ethane, assess the condition and suitability of an ethane sample or stream, and determine which handling or processing actions its composition, physical state and documented controls support.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to identify ethane, assess the condition and suitability of an ethane sample or stream, and determine which handling or processing actions its composition, physical state and documented controls support.
Ethane is the saturated acyclic hydrocarbon C₂H₆, consisting of two carbon atoms joined by a single bond and six hydrogen atoms, and is a colourless, flammable gas at ordinary ambient temperature and pressure.
It can be Verify that an analytical result or supplier record identifies ethane rather than ethylene or an unspecified hydrocarbon mixture.; Qualify a sample against a named ethane purity or feedstock specification.; Assess the likely phase and select appropriate property data using recorded composition, temperature and pressure.; Screen a proposed storage or transfer operation against documented pressure, temperature and material-compatibility requirements.; Assess suitability for ethylene production, fuel use or research against use-specific impurity limits.; Identify missing measurements or classifications that prevent a handling or processing decision..
Distinguishing features
An ethane molecule contains two carbon atoms and six hydrogen atoms joined as CH3-CH3, distinguishing it from methane and propane.
Its carbon-carbon bond is single, distinguishing saturated ethane, C2H6, from unsaturated ethylene, C2H4.
Ethane is gaseous at ordinary room temperature and atmospheric pressure; a claimed liquid sample requires supporting temperature and pressure evidence.
A stream containing ethane is not necessarily an ethane-grade material: measured composition must distinguish a qualified ethane supply from natural gas or another mixture.
Scope
+ Molecular identity and traceable chemical identifiers for ethane
+ Ethane purity, grade, impurities and analytical evidence
+ Physical phase and measured properties at stated temperature and pressure
+ Suitability as a petrochemical feedstock, fuel component or research material
+ Ethane-specific flammability, oxygen-displacement and pressure or cryogenic hazards
+ Applicable substance classifications and condition-dependent transport identities
- Natural gas and other multicomponent mixtures as complete materials
- Ethylene, methane, propane and other distinct chemical substances
- Steam crackers, refrigeration systems, storage vessels and pipelines as equipment
- Complete production, separation or combustion process models
- Commercial product contracts and supplier organisations
- Facility-wide emergency response and environmental permitting
Characteristics
- Chemical identity
- Ethane; C2H6; CH3-CH3; verified CAS, PubChem and EC identifiers Prevents confusion with ethylene and connects records to the correct substance.
- Ethane content
- mol%, mass% or volume% with basis, analytical method and uncertainty Determines whether a sample meets its stated grade and supports valid property calculations.
- Impurity profile
- Component-specific mol%, ppm by mole or mg/kg, including detection limits Water, sulfur species, carbon dioxide, oxygen and other hydrocarbons can affect processing, safety and product suitability.
- Grade qualification
- Sample or lot linked to a named specification, revision and certificate of analysis A grade claim is meaningful only against explicit acceptance criteria and evidence.
- Temperature
- K or °C, with location and measurement time Controls phase, density and whether cryogenic handling conditions apply.
- Pressure
- Pa, kPa or bar, explicitly absolute or gauge Supports phase assessment and interpretation of storage and transfer conditions.
- Physical state
- Gas, liquid, solid, two-phase or supercritical, supported by composition and conditions Determines which property models and handling controls are relevant.
- Phase-transition reference properties
- Melting and boiling temperatures in K or °C at specified pressure; critical temperature and pressure with sources Allows condition-dependent phase claims to be checked rather than inferred from a substance label.
- Density
- kg/m³ at stated temperature, pressure, phase and composition Supports quantity conversion, inventory assessment and transfer calculations.
- Hazard and transport classification
- Verified jurisdiction-specific GHS classification and transport designation for the supplied physical form Compressed and refrigerated supplies can require different documentation and controls.
- Exposure-control criteria
- Applicable exposure limits, oxygen criteria and flammable-gas alarm criteria, each with units, authority and averaging basis Separates substance exposure requirements from oxygen deficiency and ignition prevention.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.ethane
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 29 questions.
Ethane identity Establishes the molecular substance and the boundary between ethane and an ethane-containing material.
Similar names and mixed hydrocarbon streams can cause an agent to apply the wrong substance model.
Molecular identification
Connects the ethane name to a specific molecular structure and authoritative identifiers.
Saturated two-carbon identity
Identity evidence must resolve ethane as CH3-CH3 rather than ethylene or another hydrocarbon.
- Which verified identifiers and structural representation establish this record as ethane, C2H6? definition
- Which authoritative record or analytical evidence supports that identification? provenance
Substance and mixture boundary
Separates the ethane substance from a sample, grade or mixture containing it.
Ethane versus containing stream
A composition result and declared specification determine how a physical material relates to the ethane substance model.
- Does this record describe molecular ethane, a qualified ethane lot or ethane as a component of a broader mixture? boundary
- Which specification, if any, permits this composition to be described as an ethane grade? definition
Composition and grade Records measured ethane content, consequential impurities and the evidence behind grade claims.
The same substance identity can cover samples with substantially different processing suitability.
Analytical composition
Captures composition on an explicit measurement basis.
Purity and impurity evidence
Ethane purity must be accompanied by quantified relevant impurities, analytical limits and representative sampling information.
- What are the ethane fraction and measured concentrations of other hydrocarbons, water, sulfur species, carbon dioxide and oxygen? measurement
- Which sampling procedure, analytical method, reporting basis and detection limits support those results? provenance
Grade acceptance
Connects a particular sample or lot to documented acceptance criteria.
Specification conformance
Grade qualification requires checking the measured sample against a named specification rather than relying on a commercial label.
- Which specification revision defines this ethane grade and its impurity limits? provenance
- Do the available results establish conformance, or is additional sampling or analysis required? action
Phase and properties Relates ethane's physical state and quantitative properties to its actual conditions.
Ambient gas, refrigerated liquid and supercritical ethane cannot be evaluated using interchangeable property assumptions.
Condition-dependent phase
Establishes physical state from temperature, pressure and composition.
Supported phase assignment
A phase designation must be supported by measured conditions and suitable phase-equilibrium evidence.
- What temperature, absolute pressure and composition describe the ethane at the relevant location and time? measurement
- Which observations or validated phase model establish whether it is gaseous, liquid, solid, two-phase or supercritical? provenance
Property applicability
Selects physical-property values valid for the sample and operating range.
Traceable thermophysical values
Transition temperatures, critical properties and density require sources, units and stated applicability.
- Which sourced melting, boiling and critical-point values apply, and what pressure and purity assumptions accompany them? measurement
- Is the proposed density or equation of state valid for this temperature, pressure and impurity profile? boundary
Ethane use suitability Connects ethane properties and grade to a specified industrial or research purpose.
Chemical identity alone does not establish fitness for cracking, combustion or a controlled experiment.
Petrochemical feedstock
Assesses ethane as a feedstock for ethylene production.
Cracker feed qualification
Feed suitability depends on the receiving process's composition and delivery requirements.
- What ethane content, impurity limits and delivery conditions does the receiving cracking process require? boundary
- Does this lot meet those requirements, or must it be conditioned, blended or rejected? action
Fuel and research use
Records requirements specific to combustion or experimental applications.
Application-specific qualification
Fuel performance and research validity require different supporting measurements and purity evidence.
- For the intended use, which heating-value basis, composition tolerances or trace-impurity limits must be recorded? measurement
- Which use requirements remain unmet or unverified for this sample? action
Hazards and handling Connects ethane's flammability and supplied physical form to verified classifications and handling constraints.
Ethane decisions must account for ignition, oxygen displacement, stored pressure and refrigerated-liquid conditions.
Release and exposure
Separates flammable-atmosphere assessment from oxygen-deficiency and exposure criteria.
Atmosphere assessment
Atmospheric acceptability requires appropriate ethane or flammable-gas measurements and oxygen measurements against applicable criteria.
- What ethane or flammable-gas concentration and oxygen concentration have been measured, using instruments suitable for ethane? measurement
- Which sourced flammability limits, exposure limits where applicable, and site alarm criteria govern the decision? provenance
Supply form and classification
Links compressed or refrigerated ethane to applicable documentation and containment requirements.
Condition-specific handling constraints
Handling and transport decisions require classifications and equipment limits that match ethane's supplied state.
- Which current safety data sheet, GHS classification and transport designation apply to this physical form and jurisdiction? provenance
- Do the documented pressure, temperature and material-compatibility limits support the proposed storage or transfer? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is recalled knowledge; no sources were consulted.
- Verify jurisdiction-specific hazard categories, transport entries and occupational exposure requirements before regulatory use.
- Physical constants describe pure ethane; commercial grades require explicit purity and impurity specifications.
- Which of these check these first hold for the sense of ethane this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Commercial ethane for petrochemical feedstock
- High-purity ethane for laboratory and analytical use
- Isotopically labelled ethane
- Which of these kinds and varieties hold for the sense of ethane this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- CAS Registry Number - 74-84-0 - Identifies ethane as a chemical substance.
- PubChem CID - 6324 - Compound identifier for ethane.
- EC number - 200-814-8 - European chemical inventory identifier.
- Molecular formula - C2H6 - The second member of the alkane homologous series.
- Which of these identifiers and schemes hold for the sense of ethane this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- United Nations Globally Harmonized System of Classification and Labelling of Chemicals (GHS): framework relevant to flammability and gases under pressure.
- United Nations Recommendations on the Transport of Dangerous Goods, Model Regulations: transport framework distinguishing compressed and refrigerated liquid ethane.
- Which of these standards and regulation hold for the sense of ethane this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Steam-cracking feedstock for producing ethylene.
- Component of natural gas used as fuel.
- Specialised low-temperature refrigerant, designated R-170.
- Liquid cryogen for rapid freezing of specimens in cryogenic electron microscopy.
- Component of analytical calibration gas mixtures.
- Which of these real-world use hold for the sense of ethane this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Molar mass - 30.07 - g/mol
- Normal boiling point at 101.325 kPa - Approximately -88.6 - °C
- Melting point near atmospheric pressure - Approximately -182.8 - °C
- Critical temperature - Approximately 32.2 - °C
- Which of these typical measurements hold for the sense of ethane this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Forms flammable mixtures with air; ignition can cause fire or explosion.
- Can displace oxygen and create an asphyxiation hazard in enclosed spaces.
- Pressurised containers can rupture when heated.
- Refrigerated liquid can cause severe cold burns and material embrittlement.
- Incomplete combustion can generate carbon monoxide.
- Which of these failure modes and hazards hold for the sense of ethane this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- GHS implementation, workplace requirements and transport rules depend on jurisdiction.
- Commercial purity and impurity specifications vary by supplier and intended application.
- Which of these regional variation hold for the sense of ethane this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Methane - Methane is CH4 and has one carbon atom; ethane is C2H6 and has two.
- Ethylene - Ethylene is C2H4 with a carbon-carbon double bond; ethane has a single bond.
- Propane - Propane is C3H8 and has three carbon atoms.
- Natural gas - Natural gas is a variable mixture that may contain ethane; ethane is a defined chemical substance.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of ethane this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative identity records should anchor the CAS, PubChem and EC identifiers for this registry entry?
- Which reference datasets and uncertainty ranges should supply ethane's phase-transition, critical and thermophysical properties?
- Which supplier or receiving-process specifications define the ethane grades this model must support?
- Which jurisdiction-specific hazard classifications, transport designations and exposure criteria apply to the intended deployment?
- What analytical and sampling evidence is sufficient to qualify a lot and detect consequential changes during storage or transfer?