Could you introduce the main processes involved in ammonia synthesis around you? Annual output? Raw materials?

Using lignite as raw material: gas generation – purification – secondary purification – synthesis, with an annual production capacity of 300,000 tons

Using anthracite as raw material, the process includes: gas generation—desulfurization—shift reaction—desulfurization—decarbonization—dimethyl synthesis, with an annual production capacity of 180,000 tons

Using natural gas as raw material, it goes through gas generation, purification (decarbonization), compression, and synthesis.

Using anthracite and coke oven gas as raw materials, the process involves: gas production—desulfurization—shift reaction—desulfurization—decarbonization—synthesis; for coke oven gas, it involves: dry desulfurization—shift reaction—further desulfurization—low-temperature shift reaction—decarbonization—synthesis. The annual production capacity is 180,000 tons

Using coke oven gas from coking plants as raw material, 350,000 tons of synthetic ammonia are produced annually. The basic process is as follows: coke oven gas → tar and naphthalene removal → feed gas compressor → low-temperature methanol washing for desulfurization → two-stage conversion → medium-temperature shift reaction → low-temperature methanol washing for decarburization → liquid nitrogen washing → syngas compressor → Cassali ammonia synthesis → freezing → storage tank area

Using white coal as raw material, the process includes: gas generation—desulfurization—compression—shift reaction—decarbonization—further purification—dimethyl synthesis—production, with an annual output of 150,000 tons

The process is a bit simple; can it be improved further?

The used equipment was purchased in June 1992 from the Lambton plant in Canada, and its production process is essentially the same as that of the Kellogg-type plants introduced in China in the 1970s. The original plant was designed to produce 1,000 st (907 t) of synthetic ammonia per day. On September 25, 2005, the plant was shut down for maintenance, during which it underwent another 50% capacity expansion; after this expansion, the daily production of synthetic ammonia reached 1,500 tons. The plant uses natural gas as raw material and is a typical ammonia synthesis plant using the hydrocarbon steam reforming method. The principle involves a catalytic conversion reaction using natural gas and water vapor to produce H2, which is needed for the synthesis of ammonia; simultaneously, CO2 and CO are generated. After carbon removal, CO2 is sent as a raw material for urea production.

Using anthracite as raw material, the process includes: gas generation—desulfurization—compression—shift reaction—decarbonization—further purification—methanol production—refining—synthesis, with an annual production capacity of 50,000 tons.

Using anthracite as raw material, the process involves: fixed-bed gas generation—tannin desulfurization—complete low-temperature conversion—tannin desulfurization—PSA decarburization—dimethyl synthesis, with an annual production capacity of 180,000 tons

Using anthracite as raw material, the process involves: fixed-bed gas generation—tannin desulfurization—complete low-temperature conversion—tannin desulfurization—PSA decarburization—dimethyl synthesis, with an annual production capacity of 180,000 tons

Using lump coal as raw material, it goes through gas generation, desulfurization, medium- and low-temperature shift reaction, pressure swing adsorption or NHD decarburization, methanation, and ammonia synthesis at 32 MPa.

Using lignite as raw material, 300,000 tons of synthetic ammonia are produced annually. Due to years of expansion and renovation, the process route is relatively complex. Gas production is carried out through fixed-bed pure-oxygen pressurized gasification; the crude gas is sent to low-temperature methanol washing after undergoing oil- and sulfur-resistant shift reaction, followed by low-temperature liquid nitrogen washing and PSA hydrogen extraction in parallel. The syngas and hydrogen are then mixed and sent to synthesis ； The methane-rich gas from the liquid nitrogen washing outlet and the PSA off-gas are sent to the conversion system. This system consists of one set of \"double-stage\" configuration (with a chamber furnace and a heat exchange furnace operating in parallel) and two sets of fully heat-exchange-based processes. Following that is a medium-string low-conversion process; the decarburization section is made up of two Benfield processes and one MDEA process, while the refining section involves methanation. The methanated gas, syngas washed with liquid nitrogen, and PSA hydrogen are mixed and the hydrogen-to-nitrogen ratio is adjusted before being fed into the synthesis tower.

Using natural gas as raw material, it has several processing stages including conversion, purification, synthesis, and compression. It is a plant that is 74 years old; its original design capacity was 30 WT, and after renovation it is planned to reach 48 WT this year.

......................Are we part of the same company?????

An overview of our plant’s ammonia synthesis process is as follows: fixed-bed gasification—desulfurization at atmospheric pressure—pressure variation to 2.0 MPa—desulfurization using tannin method—decarbonization through thermal alkali treatment—copper washing for purification—ammonia synthesis at 31.4 MPa. The raw material is anthracite, with an annual production of 210,000 tons.

During the planned economy era, numerous small nitrogen fertilizer plants existed across the country, primarily producing ammonium bicarbonate； With the development of the fertilizer industry, small nitrogen-based fertilizers have largely fallen out of people’s attention, which indicates **progress has been made and the fertilizer industry has developed; now, regions across the country are competing to launch urea production projects, with anyone who has the capability doing so. In business, being quick to act is crucial; failing to seize opportunities will come at a cost. There are many processes for producing synthetic ammonia, with the main difference lying in the various process routes resulting from different raw materials. Annual production: 300,000 tons of synthetic ammonia. Raw materials: Bituminous coal combined with coke dust to form water-coal slurry. Process: Gasification — transformation — low-temperature methanol washing — liquid nitrogen washing — ammonia synthesis

Fertilizer production unit at a chemical plant in Guanzhong, Shaanxi: 40,000 units of Air Liquide liquid oxygen pumps for compression, with argon extraction included; Huating bituminous coal is used in Texaco water-coal slurry gasification; sulfur-tolerant shift reaction follows; Linde low-temperature methanol washing is employed; Linde liquid nitrogen washing is also used; DELAVAL syngas compressors are used; Topsoe S200 systems are used for ammonia synthesis; Toyo ACES systems are used for urea production. The capacity is 300,000 tons of ammonia per year and 520,000 tons of urea per year. H2S is fed into the Claus sulfur recovery unit to recover sulfur. This post was last edited by yzhaown99 on 2009-2-26 10:54.]

Hunan; local coal, fixed-bed batch gas production – wet desulfurization – medium-low pressure conversion – copper washing – 40,000 tons of synthetic ammonia per year. Integrated alkali production process.

Due to our factory’s outdated technology and high energy consumption, coupled with the high price of anthracite, the company is suffering severe losses. Our factory is now starting a new project. The process flow is as follows: pressurized gasification of water-coal slurry at a gasification pressure of 6.5 MPa–6.25 MPa; sulfur-resistant shift reaction; low-temperature methanol washing; liquid nitrogen washing; compression; ammonia synthesis at 13.8 MPa (Topsoe S-300 reactor)