Transcat process

Transaminases Transamination Transannular peroxide Transcat process Transcobalamin II Transcortin... 

If the production of vinyl chloride could be reduced to a single step, such as dkect chlorine substitution for hydrogen in ethylene or oxychlorination/cracking of ethylene to vinyl chloride, a major improvement over the traditional balanced process would be realized. The Hterature is filled with a variety of catalysts and processes for single-step manufacture of vinyl chloride (136—138). None has been commercialized because of the high temperatures, corrosive environments, and insufficient reaction selectivities so far encountered. Substitution of lower cost ethane or methane for ethylene in the manufacture of vinyl chloride has also been investigated. The Lummus-Transcat process (139), for instance, proposes a molten oxychlorination catalyst at 450—500°C to react ethane with chlorine to make vinyl chloride dkecfly. However, ethane conversion and selectivity to vinyl chloride are too low (30% and less than 40%, respectively) to make this process competitive. Numerous other catalysts and processes have been patented as weU, but none has been commercialized owing to problems with temperature, corrosion, and/or product selectivity (140—144). Because of the potential payback, however, this is a very active area of research. 

Feeding 1,2-dichloroethane, hydrogen chloride, and oxygen onto a fluidized bed at 400°C produces trichloroethylene and tetrachloroethylene. The catalyst bed consists of cupric chloride and potassium chloride on graphite. A modified oxychlorination technique known as the Transcat process has been developed by the Lummus Co. (32). The feedstock can be a saturated hydrocarbon or chlorohydrocarbon and the process is suited to the production of and chlorohydrocarbons. 

Figure 6-1. The Transcat process for producing vinyl chloride from ethane. ...

A small portion of vinyl chloride is produced from ethane via the Transcat process. In this process a combination of chlorination, oxychlo-rination, and dehydrochlorination reactions occur in a molten salt reactor. The reaction occurs over a copper oxychloride catalyst at a wide temperature range of 310-640°C. During the reaction, the copper oxychloride is converted to copper(I) and copper(II) chlorides, which are air oxidized to regenerate the catalyst. Figure 6-1 is a flow diagram of the Transcat process for producing vinyl chloride from ethane. ... 

Lummus hypochlorite process, 10 655 Lummus-Transcat process, 25 647 Lummus-Unocal-UOP process, 23 331, 332... 

This method, investigated in 1965/1967 in the pilot plant stage jointly by Lurnmus and Armstrong Cork (Transcat process), continues to instigate research and development particularly by ICL... 

From Ethane. Ethane is cheaper and more readily available than either ethylene or acetylene. The "Transcat" process involves cracking of a feedstock such as ethane to ethylene, which is chlorinated, oxychlorinated, and dehydrochlorinated simultaneously. Copper oxychloride acts as an oxygen carrier in this process and also functions in the recovery of HCl ... 

High purity vinyl chloride is produced in an overall yield of 80 mol% based on ethane. The feed can contain ethane, ethylene, mixed ethylene-chlorination products, and HCl in various mixtures, and can thereby allow recovery of values from such materials. The flow sheet for the simultaneous chlorination, oxidation, and dehydrochlorination for producing vinyl chloride by the Transcat process is shown in Figure 3. 

Figure 3. Flowsheet simultaneous chlorination, oxidation, and dehydrochlorination for vinyl chloride production (Transcat process).

Molten salts have already found numerous technical applications in industrial catalytic processes. Examples include the Deacon and Transcat process for generating chlorinated hydrocarbons as well as SO2 oxidation processes (1,2). 

Transcat An oxychlorination process for making vinyl chloride from ethane and chlorine ... 

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