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Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is stripped of methanol and water by a low energy process at relatively low temperature by means of recycled inert gas in a stripping co

Formaldehyde manufacture by oxidative-dehydrogenation of methanol over a silver or copper catalyst. Aqueous formaldehyde solution is obtained from the reaction and is stripped of methanol and water by a low energy process at relatively low temperature by means of recycled inert gas in a stripping column comprising at least about 1.5 theoretical transfer units for stripping methanol.

대표청구항 ▼

A process for the manufacture of an aqueous solution of formaldehyde comprising the steps of: (a) oxidatively dehydrogenating methanol with air in the presence of a silver or copper catalyst and steam at elevated temperature; (b) absorbing the reaction product in an absorption train comprising one o

A process for the manufacture of an aqueous solution of formaldehyde comprising the steps of: (a) oxidatively dehydrogenating methanol with air in the presence of a silver or copper catalyst and steam at elevated temperature; (b) absorbing the reaction product in an absorption train comprising one or more absorption stages in series to form an aqueous formaldehyde solution containing free and combined methanol; and (c) stripping the methanol from the aqueous formaldehyde solution with a counter-current inert gas stream in a stripping column comprising at least about 1.5 theoretical transfer units for methanol stripping, the stripping being carried out at a temperature and at a ratio of stripping gas to aqueous formaldehyde to provide a concentration of vapors of aqueous methanolic formaldehyde in the gas emerging from the stripping column of no more than about 50 mol percent.