Purisol Process

Purisol Process from Lurgi N-Methyl-2-Pyrrolidone (NMP)... 

The Lurgi Purisol process [663], [717], [718], [726] uses AT-methylpyrrolidone (NMP) as solvent and can be operated at ambient temperature or, with inclusion of a refrigeration unit, at temperatures down to -15 °C. The bbS/CO-, selectivity is superior to Selexol, permitting the production of a rich Claus gas with about 50% H2S even at relatively low concentration of hydrogen sulfide in the raw gas. The solubility of COS is only 20% of that of H2S, but it is largely hydrolyzed by the NMP. Preferred operating pressure is 45 to 85 bar. The process can, of course, be... 

The Purisol process can be used also for what has been termed the all-out puriflcation process required to produce methanol from gases resulting from medium temperature gasification of coal, which contain relatively little CO but more CO2 than required. However, if NMP is to be used for such applications, it will be necessary not only to increase the sulfur content of the sulfur offgas, but also to provide for additional fine desulfurization. 

Fluor Solvent Process, 1198 Selexol Process, 1202 Sepasolv MPE Process, 1210 Purisol Process, 1210 Rectisol Process, 1215 Ifpexol Process, 1223 Estasolvan Process, 1224 Methylcyanoacetate Process, 1225... 

With most processes, solvent recovery from the effluent streams is not required since the vapor pres.sures of the solvents are sufficiently low at operating conditions. With some processes, however, such as the Purisol process, effluent streams are water washed. 

The solvent used in the Purisol process is N-methyl-2-pyrrolidone (NMP), a high boiling liquid, which has an exceptionally high solubility for hydrogen sulfide. NMP is particularly... 

Typical Process Conditions for Acid-Gas Removal willi Purisol Process... 

Giiinewald, G., 1989, Selective Physical Absorption Using the Purisol Process, paper presented at 6th Continental Meeting of the European Chapter of the GPA, Bremen, Germany, May 19. 

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