| PATENT CLAIMS |
(a) Lower section which includes a heatable solid surface (16) of evaporator tubes & means (2,3) for heating tubes, wherein said tubes are separated from each other by first ring means (21) & second ring means (23) with an insulating material (30) between (21) & (23) which shields (30) from contact with any vapor present in evaporator during its operation
(b) An upper section comprising the means for feeding a liquid contg glycol to said tubes which comprises at least one perforated box distributor (12,14), connected in series & arranged in evaporator in such way that all of total (16) of tubes is in contact with liquid during operation &
(c) Means for thermally insulating tube plates in upper & lower sections
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