Cosorb process

Cosmetics industry Cosmic radiation Cosmid vectors Cosmocil CQ CoS04 7H20 Cosorb process Cost estimates... 

Gosorb Process. Like the copper—Hquor scmbbing method, the Cosorb process also reHes on the formation of a cuprous complex of carbon monoxide but uses a nonaqueous organic solvent. The preferred system uses a cuprous tetrachloroalurninate toluene complex in a toluene solvent (90). Many other organometaUic complex variants have been proposed (91—93) but have not been commercialized. 

The main advantages of the Cosorb process over the older copper ammonium salt process are low corrosion rate, abiHty to work in carbon dioxide atmospheres, and low energy consumption. The active CuAlCl C H CH complex is considerably more stable than the cuprous ammonium salt, and solvent toluene losses are much lower than the ammonia losses of the older process (94). 

The carbon monoxide purity from the Cosorb process is very high because physically absorbed gases are removed from the solution prior to the low pressure stripping column. Furthermore, there is no potential for oxidation of absorbed carbon monoxide as ia the copper—Hquor process. These two factors lead to the production of very high purity carbon monoxide, 99+ %. Feed impurities exit with the hydrogen-rich tail gas therefore, the purity of this coproduct hydrogen stream depends on the impurity level ia the feed gas. 

In the Cosorb process, cuprous tetrachloroaluminate toluene complex in a toluene medium is used as the absorbing liquid instead of the copper salt so-... 

ESEP A process for removing ethylene from gas streams by absorption in a solution of Cu/ ICI4 in an aromatic solvent. Developed from the COSORB process by Tenneco in 1978. 

Fig. 1.1.2 Carbon monoxide manufaclure. Tenneco s Cosorb process.

Of practical use is the adduct formed by the CuCl-AlClj system " in toluene the absorption of CO can be reversed by thermal treatment. This reaction is used for the CO recovery from the synthesis gas (Cosorb process) ... 

Tenneco developed the COSORB process in the 1970s to recover carbon monoxide from syngas and offgas streams. It consists of an absorber and... 

Figure 15 Process flow diagram for the COSORB process.

The carbon monoxide purity produced by the COSORB process is extremely high because the physically absorbed gases are removed from the solvent prior to the stripper column. Product purity is typically 99.95 + %. Feed impurities exit with the hydrogen product. Therefore, the hydrogen purity from the process depends on the concentration of impurities entering with the feed gas. 

The absorber can operate between 25 and 300 psig, depending on the pressure of the feed gas. The stripper, however, operates at about 15 psig, and, thus the carbon monoxide product from the COSORB " process is always produced at low pressure. For many applications, product compression may be necessary. 

If required, relatively pure carbon monoxide can be recovered by cryogenic separation (i.e. condensation at very low temperatures), use of selective scrubbing solutions (for example CUAICI4 in toluene, the COSORB process) or solid adsorbents, and by other methods. Some CO recovery techniques are also applicable to the CO-rich (c. 70% molar) off-gases from basic oxygen furnaces and the leaner off-gases from air blast furnaces produced in steel manufacture, though operations of this type are still limited. 

Aqueous Copper Ammonium Salt Process, 1347 COSORB Process, 1357... 

The use of aqueous cuprous-ammonium carbonate and formate solutions was first described in a patent to Badische Anilin and Soda Fabrik (1914). Subsequently, the aqueous process was utilized in many plants and the chemistry of the process was studied extensively. More recently, a process based on the use of cuprous aluminum chloride in an aromatic solvent carrier (the COSORB process) has been developed. The new process is reported to have the advantages of greater complex stability and a lower corrosion rate. Both the aqueous and non-aqueous processes are discussed in the following sections. Although the aqueous process is now seldom used, it is included in the discussion because of its historical and technical interest. A more detailed discussion of the aqueous process is given in previous... 

The COSORB process resembles the copper-ammonium salt process described in the preceding section in that it also uses a copper compound that forms a complex with absorbed CO. It is significantly different, however, in that the ab.sorbent is nonaqueous. The active component is cuprous aluminum chloride (CUAICI4) dissolved in an aromatic base, toluene (Haase, 1975). The absorption-desorption reaction can be represented by the following equation ... 

KTI (Kinetics Technology International Corporation), 1994, personal conununication and brochure. The KTI-COSORB Process. 

The salt process employs scrubbing of the gas with cuprous ammonium salt solution. Carbon monoxide forms a complex with the solution at high pressure and low temperature in the absorption column. The absorbed pure carbon monoxide is released from the solution at low pressure and high temperature. In the Cosorb process, cuprous tetrachloroaluminate (CuAlCl ) in a toluene medium is used as the absorbing liquid instead of the copper salt solution. A low corrosion rate and low energy consumption are the advantages of the Cosorb process over the previous one. 

Sketch (a) ibuprofen, (b) j3-lactam, (c) j3-lactone, (d) cyclopentenone, and (e) a CO-inserted hydroxymethyl complex. Explain their relevance to carbonylation reactions using homogeneous catalysts. What is the (f) supercritical state of CO2 and (g) the adsorbent in the Cosorb process ... 

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