Abstract A process and an installation for drying cellulose materials. The invention consists in placing the materials in a vacuum-tight enclosure, bringing the materials in contact in vacuo with ethylene glycol diacetate injected into the enclosure after having been dried and heated initially to a temperature of from 60* to 70* C and which is raised gradually during drying to a steady end value of from 100* to 110*C, maintaining a vacuum equal to the ethylene glycol diacetate vapour pressure in the enclosure throughout drying, drying the ethylene gylcol diacetate from the enclosure by exhausters, and condensing and filtering the recovered ethylene gylcol diacetate for reinjection into the enclosure, the cycle just described being repeated until the cellulose materials are completely dry.
Inventors
👤 R Furlan
👤 J Delhaye
👤 P Vuarchex
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-29 17:37
CPC Classifications
D; D21; D21F; D21F13/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
245 words
An installation for drying cellulose materials comprising: a. a vacuum-tight enclosure which contains the cellulose material for drying and which has a first line for the introduction of dry ethylene glycol diacetate in the liquid state into the enclosure from a vacuum supply tank connected in series with a heater, a second line at the bottom of the enclosure for the discharge of liquid ethylene glycol diacetate to the supply tank, and a third line to which the following items are connected in series, starting from the enclosure, to recover and dry the ethylene glycol diacetate and to remove residual gases from the enclosure: i. a first condenser associated with a separator and with a first water trap, ii. a first vacuum exhauster, iii. a second condensor associated with a second water trap, iv. a second vacuum exhauster to produce a preliminary vaccum, the first exhauster serving to boost the preliminary vacuum created by the second exhauster; b. a pump associated with a filter in the liquid ethylene glycol diacetate line between the supply tank and the enclosure; and c. valves for isolating the various items mentioned and enabling the pump in series with its filter to inject said ethylene glycol diacetate into the enclosure through the first line, before the drying of said diacetate, and through the second line, during the drying of said acetate, and to remove said ethylene glycol acetate from the enclosure to the tank after the acetate has been dried.