During the 1920s the company Koninklijke Nederlandsche Hoogovens en Staalfabrieken constructed a steelworks on the north bank of North Sea Canal near IJmuiden; the steel production process produced a number of auxiliary by-products including a variety of carbon and hydrogen based compounds from the production of coke from coal. Mekog was established in 1928 as a joint venture between KNHS and Bataafsche Petroleum Maatschappij to use the hydrogen content of the coke oven gas to manufacture ammonia to make nitrogen based fertilizers. Production began in September 1929. The plant was located in the southeast corner of the IJmuiden site. As initially built the process involved firstly washing the coke oven gas to remove benzene, tar and related compounds. The gas was then compressed and washed again to remove CO2, followed by refrigeration to -200C which liquified the gas mixture with the exception of the hydrogen, which could then be separated and purified for the ammonia process. Syntheses of ammonia was carried out at 450C at 80 atm using an iron cyanide catalyst - the ammonia was washed out and the unreacted recirculated into the reaction. The ammonia produced was reacted with dilute sulphuric acid to return Ammonium sulphate as the product; initially 200 ton per day was produced. At nitric acid plant opened in 1930, and a phosphoric acid plant briefly operated in the 1930s but was uneconomic. In 1939 calcium ammonium nitrate production was started. In 1949/50 and in 1955 the plant's capacity was expanded resulting in a primary ammonia capacity of over 93000 tons by 1955; the 1955 development introduced the use of petroleum as a In 1961 the company merged with Albatros Superfosfaatfabrieken to create Verenigde Kunstmestfabrieken Mekog-Albatros ; this firm created a joint venture with BASF: Ammoniak Unie, which established an ammonia plant in Pernis, Netherlands. VKF merged with the fertilizer division of DSM in 1972 creating Unie van Kunstmest Fabrieken which was part owned by KNHS, Koninklijke Nederlandse Zoutindustrie, Shell and DSM, KHNS and KNZ left the venture in 1973 leaving the company three quarters owned by DSM. UKF became a full DSM subsidiary in 1979 including Mekog under the group 'DSM Agro BV'. By 1967 the plant was producing 564000 tonnes of fertilizer and employed a peak of 1160 people; discovery of a large gas resources at Groningen, the Netherlands ) altered the 'energy balance' in the Netherlands - and production was done using natural gas instead of coke oven gas. In 2008 DSM Agro and the Dutch government reached an agreement to end potentially dangerous rail transportation of Ammonia between IJmuiden and Geleen; as a result the former 'Mekog' plant was no longer viable. DSM was to closed its IJmuiden plant on 1 January 2010, and would receive compensation from the Dutch government; a nitric acid plant at IJmuiden was to be relocated to Geleen. Approximately 120 people were made redundant as a direct result of the closure. The nitric acid plant was moved to Geleen during the first half of 2010, to be operated by the agrochemicals division of Orascom Construction Industries, which had acquired DSM agro in June 2010. The relocated plant is part of the OCI Agro unit of the Nitrogen division of OCI.
