Molekula
Thionyl chloride
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Thionyl chloride is a highly reactive inorganic compound (SOCl₂) widely used in organic synthesis to convert carboxylic acids into acyl chlorides and alcohols into alkyl chlorides, and to dehydrate primary amides to nitriles. It is also employed in chlorination reactions and as a dehydrating agent. On an industrial scale, it is used in manufacturing pharmaceuticals, pesticides, dyes and engineering plastics, and as an electrolyte in lithium batteries. This colorless to yellowish liquid has a pungent odor and must be handled with care due to its corrosive and toxic properties. Thionyl chloride has a CAS number of 7719-09-7, a molecular weight of 118.97 g/mol, and is typically stored at ambient conditions. It carries a Danger signal word under GHS classification due to its severe hazards. Molekula supplies thionyl chloride from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
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500 mL — £140.30 per pack ex VAT · £168.36 inc. VAT
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Specifications
| Property | Value |
|---|---|
| Appearance | Colourless to slightly yellow clear liquid |
| Assay | ≥99% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | I |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless to pale yellow or reddish liquid |
| Odour | Suffocating odor |
| Melting Point | -104.5 °C |
| Boiling Point | 76 °C |
| Density | 1.64 (relative, water = 1) |
| Vapour Pressure | 16 kPa at 25 °C |
| Refractive Index | 1.517 |
Source: PubChem CID 24386 (HSDB, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 19659654 |
| CAS Number | 7719-09-7 |
| IUPAC Name | thionyl dichloride |
| EC Number | 231-748-8 |
| Molecular Formula | SOCl2 |
| Molecular Weight | 118.97 |
| Exact Mass | 117.9047 |
| SMILES | O=S(Cl)Cl |
| InChIKey | FYSNRJHAOHDILO-UHFFFAOYSA-N |
| InChI | InChI=1S/Cl2OS/c1-4(2)3 |
| PubChem CID | 24386 |
| UN Number | UN1836 |
| REACH Code | Y110 |
| HTS Code | 2812.17.0000 |
| Tariff Code | 2812170000 |
Safety & GHS
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Corrosive
GHS05
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Toxic
GHS06
Hazard statements
- EUH014 Reacts violently with water
- EUH029 Contact with water liberates toxic gas
- H302 Harmful if swallowed
- H314 (sub cat. 1A) Causes severe skin burns and eye damage
- H331 Toxic if inhaled
Precautionary statements
- P223 Keep away from any possible contact with water, because of violent reaction and possible flash fire
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Dichlorosulfoxide
- SOCl2
- Sulfinyl chloride
- Sulfinyl dichloride
- Sulfur chloride oxide
- Sulfur chloride oxide (Cl2SO)
- Sulfur oxychloride
- Sulfurous dichloride
- Sulfurous oxychloride
- Thionyl dichloride
Frequently asked questions
What is thionyl chloride (SOCl₂) commonly used for?
Thionyl chloride is primarily used as a reagent for converting carboxylic acids, alcohols, and amides into their corresponding acid chlorides, esters, or nitriles, and for drying solvents by removing traces of water.
What is the molecular formula and molecular weight of thionyl chloride?
The molecular formula is SOCl₂, and the molecular weight is 118.97 g/mol.
How should thionyl chloride be stored?
Thionyl chloride should be stored in a tightly sealed container at ambient temperature, away from moisture, oxidizing agents, and incompatible materials.
What grades of thionyl chloride does Molekula supply?
Molekula supplies reagent-grade thionyl chloride (typically ≥99% purity) for laboratory and industrial applications.
Can Molekula supply thionyl chloride in bulk quantities?
Yes, Molekula can supply thionyl chloride in bulk quantities, with packaging options tailored to customer requirements (e.g., drums, IBCs).
What documentation comes with an order of thionyl chloride?
Each order includes a Certificate of Analysis (CoA), Material Safety Data Sheet (MSDS), and batch-specific documentation for traceability.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.