Methylbutynol conversion

We have reported in Table 5, methylbutynol conversion at the 12th pulse and the acidic (A), basic activities (B) and activity due to acid base pairs (B) obtained for each samarium phosphate. The evolution of acido properties conversion of MBOH and selectivity in the various products formed as a function of preparation methods and calcination temperatures are reported Figures 7 and 8. 

Continuous processes have been developed for the alcohols, operating under pressure with Hquid ammonia as solvent. Potassium hydroxide (206) or anion exchange resins (207) are suitable catalysts. However, the relatively small manufacturing volumes militate against continuous production. For a while a continuous catalytic plant operated in Raveima, Italy, designed to produce about 40,000 t/yr of methylbutynol for conversion to isoprene (208,209). 

To a 1-L stirred autoclave was added 0.10 mol methylbutynol-KOH adduct, 1.6 mol acetylene, and 200 mL liquid ammonia. Then 1.6 mol acetone was introduced into the autoclave within 30 min at 30-32°C. The total pressure in the autoclave averaged 160-185 psi. After 1.5 h, ammonia was vented, and dry CO2 gas was introduced into autoclave to neutralize the catalyst complex to KHCO3 and methylbutynol. The total conversion to methylbutynol before distillation was 97%, the catalytic conversion was 1170%, and the conversion to pure methylbutynol was 88%, b.p., 103-104°C. 

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See also in sourсe #XX -- [ ]

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