Water-Soluble Liquid Triazine H2S Scavenger (CAS 4719-04-4): Properties

Identity: What Is CAS 4719-04-4?

CAS 4719-04-4 is the registry number for 1,3,5-tri(2-hydroxyethyl)-hexahydro-s-triazine — the water-soluble liquid triazine used as the active in MEA-triazine H2S scavengers. It is also known by synonyms including hexahydro-1,3,5-tris(2-hydroxyethyl)-s-triazine and tris(hydroxyethyl) hexahydrotriazine. The molecule is a six-membered ring of alternating carbon and nitrogen atoms, with each nitrogen carrying a 2-hydroxyethyl arm derived from monoethanolamine. Those three hydroxyl-bearing arms are what make the compound freely water-soluble. Commercially it is supplied as an aqueous solution, most commonly at 78% active content, and is the single most widely used liquid H2S scavenger in oil and gas worldwide.

• CAS 4719-04-4 — 1,3,5-tri(2-hydroxyethyl)-hexahydro-s-triazine
• Clear to amber liquid, 78% active, fully water-soluble
• Spent dithiazine by-product is water-soluble — no solids to dispose
• Pumpable with standard metering equipment; no heating needed at ambient
• Supplied in drums, IBCs, or bulk with COA, TDS, and SDS

Why Water Solubility Matters

Water solubility is a defining functional advantage of this liquid triazine scavenger. Under controlled dosing conditions, both the fresh triazine and its spent dithiazine by-product are generally water-compatible, so the chemistry can integrate cleanly with produced-water systems — with far less solid to filter, sludge to landfill, or fouling layer on equipment surfaces than iron-oxide solid scavengers, which generate iron-sulfide waste. This is not an absolute guarantee of solids-free operation: over-reaction, high spent loading, or long residence times can push the chemistry toward dithiazine/trithiane precipitation, so solids management and monitoring remain part of a well-run programme. Water solubility also means the scavenger disperses readily when injected into aqueous or mixed streams, improving contact with dissolved H2S. The main corollary to remember is phase behaviour: in strongly oil-continuous systems, a water-soluble scavenger may need help — mixing, a water carrier, or an alternative chemistry — to reach H2S held in the oil phase.

Typical Physical Properties and Specifications

A representative specification for the water-soluble liquid triazine H2S scavenger at 78% active is: appearance, clear to pale-yellow/amber liquid; active content, 78% ± 1%; physical form, liquid at ambient; solubility, fully miscible with water; mild amine odour; specific gravity in the region of 1.1–1.2; and a mildly alkaline pH. Exact values should always be read from the batch Certificate of Analysis and Technical Data Sheet, since grades and concentrations vary. Because it is an amine-based aqueous liquid, it is pumpable with standard metering equipment and does not require heating to remain fluid under normal ambient conditions, though very low temperatures increase viscosity. Store in sealed HDPE or lined containers away from strong acids and oxidisers.

Liquid Triazine as a Gas-Treatment Chemical

As a liquid triazine-based H2S scavenging chemical, CAS 4719-04-4 is deployed by continuous injection or in gas-liquid contactors. Its liquid form is a practical advantage over solid media: it is metered precisely in proportion to gas flow and H2S concentration, it needs no vessel change-outs, and it produces no spent solids to handle. In gas processing, the liquid is contacted with sour gas in bubble or spray towers; in pipelines and flowlines, it is injected through a quill with a static mixer to improve utilisation. The same liquid treats sour water, LPG, and crude-tank vapor spaces. This versatility — one pumpable liquid across gas, liquid, and multiphase duty — is a core reason liquid triazine dominates field H2S control.

Sourcing, Packaging, and Documentation

Vasudev Chemo Pharma manufactures the water-soluble liquid triazine H2S scavenger (CAS 4719-04-4) at an ISO 9001:2015 certified facility in Gujarat, India, supplying it in 220-litre HDPE drums, 1000-litre IBCs, and bulk quantities for export through Kandla, Mundra, and Hazira ports. Every batch ships with a Certificate of Analysis confirming active content and key parameters, plus a Technical Data Sheet and GHS-compliant Safety Data Sheet. For regulated import markets we provide the supporting documentation buyers need for customs and compliance. Free samples are available for laboratory qualification and field trials before committing to production volumes.