Cradle to Gate
Identity ID
d415c8a5-f697-4ca2-81bb-6909dc0a66d0
Materials
Associated ID
81e45037-9ae7-41f5-8783-5a1872ac8a0e
Included activities starts
Included activities ends
Description
Hydrogen sulfide can be used to produce chemicals such as sodium sulfide, barium sulfide, and iron sulfide, as well as for sulfidation treatment of metals; this dataset includes main raw and auxiliary materials, energy inputs, atmospheric emissions, and waste outputs from the production process, but excludes infrastructure such as production equipment and facility construction; the life cycle inventory is compiled from data sourced from multiple references; the coal-based synthetic ammonia process comprises steps including gasification, shift conversion, low-temperature methanol washing, liquid nitrogen washing, purification, ammonia synthesis, and separation, with hydrogen sulfide produced as a by-product.
Activity Description
The coal-to-synthetic ammonia process includes steps such as gasification, shift conversion, low-temperature methanol washing, liquid nitrogen washing, purification, ammonia synthesis, and separation, with hydrogen sulfide being a byproduct of this process.
Process Description
Hydrogen sulfide is an inorganic compound with the CAS number 7783-06-4. It is named 'hydrogen sulfide' under IUPAC nomenclature, with the molecular formula H2S. It is a colorless, flammable gas with a pungent odor under normal temperature and pressure conditions and is highly toxic. The aqueous solution of hydrogen sulfide is known as hydrosulfuric acid, which is a weak acid. At the consumer level, hydrogen sulfide is used in the following products: 1. Chemical synthesis, as a raw material for synthesizing various chemicals such as sodium sulfide, barium sulfide, and iron sulfide; 2. Metal processing, for leaching valuable metals from metal ores and for sulfidation treatment of metals; 3. The rubber industry uses this substance as a crosslinking agent for rubber to enhance its strength and wear resistance. In industrial applications, it is used in the production processes of the following sectors: 1. The oil and gas industry, as a desulfurization agent to remove hydrogen sulfide from oil and natural gas; 2. Mining, for the processing of ores such as copper, lead, and zinc, as well as for metal extraction from ores; 3. Wastewater treatment, as a disinfectant to effectively kill bacteria and other harmful microorganisms in water.
Time period
2019
2026
Geography
China
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The water-coal slurry obtained from processed raw coal reacts with pure oxygen produced by the air separation unit, generating synthetic gas that is then sent to the shift conversion unit where CO in the synthetic gas reacts with steam to convert into CO2 and H2. When the CO content in the shifted gas decreases to 0.5%--1%, the gas is cooled and enters the low-temperature methanol washing section to remove most of the H2S, CO2, and H2O. Subsequently, it enters the liquid nitrogen washing unit for further purification, reducing the CO+CO2 content in the decarbonized gas to less than 15 ppm, and after separation, is compressed to 13 MPa by a compressor. 9 MPa, together with the circulating gas discharged from the circulating gas compressor, enters the ammonia synthesis process, where ammonia is produced under the action of a catalyst, followed by separation to obtain liquid ammonia product; unreacted circulating gas is sent back to the circulating gas compressor for further recycling.