Cosden

Other Technologies. Ethylbenzene can be recovered from mixed Cg aromatics by superfractionation. This technology was first practiced by Cosden Oil Chemical Company in 1957 (Big Spring, Texas), based on a design developed jointly with The Badger Company. Several superfractionation... 

S. Weber and G. McClure, The Cosden/Malaprop Processfor Eight Hydrocarbon Desulfurization, Annual Meeting Paper AM-81-49, National Petroleum Refiners Association, Washington, D.C., 1981. 

Vinyltoluene, comprising a mixture of ca 33% para- and 67% y /i7-methylstyrene, has been marketed for ca 45 yr by Dow Chemical Company and also by Cosden. However, the performance properties of the polymers prepared from the para isomer are not only superior to those of the polymer prepared from the typical mixed isomers, but are generally superior to those of polystyrene (60). This advantage, coupled with a raw material cost advantage over styrene, suggests that i ra-methylstyrene may displace significant amounts of styrene, currendy a 3.2 x 10 t/yr domestic market. 

The ionic liquid process has a number of advantages over traditional cationic polymerization processes such as the Cosden process, which employs a liquid-phase aluminium(III) chloride catalyst to polymerize butene feedstocks [30]. The separation and removal of the product from the ionic liquid phase as the reaction proceeds allows the polymer to be obtained simply and in a highly pure state. Indeed, the polymer contains so little of the ionic liquid that an aqueous wash step can be dispensed with. This separation also means that further reaction (e.g., isomerization) of the polymer s unsaturated ot-terminus is minimized. In addition to the ease of isolation of the desired product, the ionic liquid is not destroyed by any aqueous washing procedure and so can be reused in subsequent polymerization reactions, resulting in a reduction of operating costs. The ionic liquid technology does not require massive capital investment and is reported to be easily retrofitted to existing Cosden process plants. 

Cosden A process for polymerizing isobutene to a polyisobutene having a molecular weight between 300 and 2,700. 

T2BX [Toluene to benzene and xylenes] A process for converting toluene to a mixture of benzene and xylenes. Toluene vapor, mixed with hydrogen, is passed over a zeolite catalyst at 430 to 370°C the hydrogen is separated and the products fractionated. The production of benzene is its main purpose. Developed by Cosden Technology, United States. 

This technique was employed industrially for the first time by Cosden in 1957. Many variants have since been commerciaiized. 

The differences between these processes are essentially technologicaL In Cosden s initia] version, a sales of three 62 m columns is used, with a diameter of 4.6 m for a production capacity of 22,700 t/year. 

Chronologically, several steps can be distinguished in the industrial development of the processes. The earliest, some of which are still used in smaller units, are those of Dow, Hiils, IG Farben. Koppers. Scientific Design, Shell. Union Carbide-Cosden BaJger etc. The latest second-generation processes are those of BASF iBadische Anilin und Soda Fabrik), CdF-Chimie-Technip. Dow and Monsamo-bmmus. 

Technology CdF Chimie Tecbsip Union Carbide Cosden/Badger Monsanto Molnl Lummus Badger ( ... 

Trusty, G. L. Cosden, T. H. Naval Research Laboratory Report 8497, 1981,... 

Three years earlier, in 1956, Grace had entered the petroleum business through a joint venture with Texas Gulf in Libya, then in 1960 came the purchase of 63 percent of Cosden (which was sold in 1963 to Petrofina). In the 1960s Grace continued to expand its chemical business (evolving into... 

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