FIELD: chemistry.
SUBSTANCE: method for water-containing source formaldehyde dehydration involves formaldehyde source contacting with a zeolite membrane in a manner effective to recover at least a portion of water from the formaldehyde source. At that, the water-containing formaldehyde source contains a separation intensifier with relative static permittivity between 2.5 and 20 at 20°C and at atmospheric pressure, and the water-containing formaldehyde source additionally contains methanol. The invention also relates to a method for ethylenically unsaturated carboxylic acid ester production, which comprises contacting of the dehydrated formaldehyde source obtained by the above method with a carboxylic acid ester in the presence of a catalyst.
EFFECT: dehydration method allows to separate water from the formaldehyde source with high efficiency.
15 cl, 2 dwg, 2 tbl, 21 ex
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