Low pressure regenerator

The low pressure regenerator is usually found in units that have not been designed for the expander. In sueh eases, the expander may not... 

The modern reforming process operates with continuous regeneration of the catalyst, at low pressure (2 to 5 bar) and high temperature (510-530°C). 

In addition to the Hquid-phase -butyl nitrite (BN) process, UBE Industries has estabHshed an industrial gas-phase process using methyl nitrite (50—52). The oudine of the process is described in Eigure 4 (52). This gas-phase process is operated under lower reaction pressure (at atmospheric pressure up to 490 kPa = 71 psi) and is more economical than the Hquid-phase process because of the foUowing reasons owing to the low pressure operation, the consumption of electricity is largely reduced (—60%) dimethyl oxalate (DMO) formation and the methyl nitrite (MN) regeneration reaction are mn... 

Overall comparison between amine and carbonate at elevated pressures shows that the amine usually removes carbon dioxide to a lower concentration at a lower capital cost but requires more maintenance and heat. The impact of the higher heat requirement depends on the individual situation. In many appHcations, heat used for regeneration is from low temperature process gas, suitable only for boiler feed water heating or low pressure steam generation, and it may not be usefiil in the overall plant heat balance. 

Exhaust Gases from the Low Pressure Turbirre to Heot the Regenerator... 

The pressure balance survey indicates that neither the spent nor the regenerated catalyst standpipe is generating optimum pressure head. This is evidenced by the low catalyst densities of 20 Ib/ft (320 kg/m ) and 25.4 Ib/ft (407 kg/m ), respectively. As indicated in Chapter 8, several factors can cause low pressure, including under or over ... 

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