Product Overview

Hydrogen sulfide CAS 7783-06-4 is a colorless, highly toxic, flammable gas with a characteristic odor of rotten eggs at low concentrations, though the sense of smell is rapidly fatigued at higher levels, making it an unreliable warning property. While primarily known as a hazardous gas present in natural gas, crude oil, and various industrial processes, hydrogen sulfide itself is also a valuable industrial chemical and reagent. It is produced and handled in controlled environments for specific applications in chemical synthesis, metallurgy, and analytical chemistry. Extreme caution and specialized safety protocols are absolutely essential for any operation involving hydrogen sulfide due to its acute toxicity and flammable nature.

Basic Information

CAS No.	7783-06-4
UN No.	UN1053 (Hydrogen sulfide)
Molecular Formula	H₂S
Hazard Classification	2.3 (Toxic gas), 2.1 (Flammable gas)

Key Attributes & Parameters

Purity	Available in various grades, including technical grade (e.g., 99.5% min.) and high-purity grades (e.g., 99.9%+) for specialized uses. Impurities may include CO₂, hydrocarbons, and water.
Physical State	Colorless gas at standard conditions. It can be liquefied under pressure.
Odor	Characteristic foul odor of rotten eggs at low concentrations (< 1 ppm). Olfactory fatigue occurs rapidly, posing a significant inhalation hazard.
Boiling Point	-60.3 °C (-76.5 °F)
Density	Heavier than air (vapor density ~1.19).
Key Hazards	Highly toxic (PEL 20 ppm, IDLH 100 ppm), flammable (LEL 4.3%, UEL 46%), and corrosive in the presence of moisture.

Features & Advantages

Potent Reducing Agent

Hydrogen sulfide CAS 7783-06-4 is a strong reducing agent, useful in various chemical reduction reactions and metal precipitation processes.

Source of Sulfide Ions

It readily dissociates in aqueous solutions to provide sulfide ions (S²⁻), which are crucial for precipitating metal sulfides.

Chemical Precursor

Serves as a direct source of sulfur for the production of other sulfur-containing chemicals like elemental sulfur, sulfuric acid (via the Claus process), and various inorganic sulfides.

High Reactivity

Its reactivity makes it suitable for specific, controlled chemical transformations.

Functional Characteristics

As a gas,Hydrogen sulfide CAS 7783-06-4 is typically supplied in high-pressure cylinders. Its primary functions stem from its reducing power and its ability to provide sulfide anions. In aqueous solution, it forms a weak acid (hydrosulfuric acid). Its reactivity allows it to precipitate insoluble metal sulfides from solution. In industrial processes, it often reacts with metal compounds or serves as a feedstock. Due to its extreme hazards, handling systems require inert gas purging, leak detection, and strict engineering controls.

Primary Application Fields

Chemical Manufacturing

Used in the production of inorganic sulfides (e.g., sodium sulfide, sodium hydrosulfide), thioorganic compounds, and as a reducing agent in specific organic syntheses.

Metallurgy & Analytical Chemistry

Employed in qualitative inorganic analysis (classic Group II cation precipitant) and in some metal refining or extraction processes.

Sulfur Production

A key feedstock in the Claus process for recovering elemental sulfur from acid gas streams in oil refineries and natural gas processing plants.

Laboratory Research

Used as a reagent in controlled research settings for studying sulfur chemistry and catalysis.

Customer Collaboration Case

A specialty chemical manufacturer producing high-purity metal sulfide nanopowders for electronics faced challenges with inconsistent particle size and purity when using aqueous sulfide salts. They required a more controllable and pure source of sulfide ions. We partnered with them to design a safe, closed-loop system for the controlled introduction of high-purity (99.9%) hydrogen sulfide gas into their reactor. Our solution included a custom-engineered gas delivery skid with mass flow controllers, integrated H₂S and oxygen monitors, and a dedicated scrubber system. The precise, gas-phase delivery of hydrogen sulfide allowed for superior control over nucleation and growth kinetics. This resulted in metal sulfide particles with a 40% narrower size distribution, higher crystallinity, and significantly reduced oxygen contamination. The reliable supply and safe handling protocol for hydrogen sulfide enabled the customer to scale up their production with reproducible quality, securing a contract with a major battery component supplier.

FAQ

Q: What are the consequences of incorrect HS code classification for the export customs declaration of chemical products? How can we ensure accurate classification?

A: Consequences: Incorrect application of tariffs (overpayment or underpayment of taxes), lack of regulatory documents (such as misclassifying dangerous goods as ordinary goods), customs inspection and seizure of goods, fines, and even affecting the enterprise's credit rating. The method to ensure accuracy: Refer to the "Import and Export Tariff", combine the product composition, usage, processing technology and other core characteristics; consult customs classification experts or third-party institutions; apply for pre-classification ruling to the customs in advance. Our company completes the confirmation of HS code at the beginning of the order to ensure accurate and error-free customs declaration classification.

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