Multiple effect evaporation of water from water containing combustible sludges

Patent 4097378 Issued on June 27, 1978. Estimated Expiration Date:

June 27, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3304991

3855079

Inventor

St. Clair, John Craig

Application

No. 05/780064 filed on 03/22/1977

US Classes:

210/770, Including drying (e.g., by squeezing or heating, etc.)159/905, SEWAGE TREATMENT208/13, TREATMENT OF REFINING SLUDGE208/145, With added source of hydrogen (includes hydrogen donor)210/774, Including temperature change210/806, Plural separating34/349, Treating suspension or slurry44/492Process including heat

Examiners

Primary: Sever, Frank

International Classes

C02F 11/00 (20060101)
C10G 1/06 (20060101)
C10G 1/00 (20060101)
B01D 12/00 (20060101)

Abstract

Water containing combustible sludges are dried with the multiple effect use of the heat required by adding recycled cool high boiling oil and heating the mixture by direct contact with steam produced as later described. Then the oil sludge mixture has water separated off which is possible, since water has been added by the direct condensation of steam in the heating of the mixture plus any extra original water in the sludge that can be removed by a centrifuge. The mixture is heated again by adding hot oil and then the mixture has water evaporated off by reducing the pressure. This steam produced is used for the direct steam heating mentioned above. Then water vapor is evaporated off again by reducing the pressure again and this water vapor is condensed by a water cooled condenser. In this way water vapor is evaporated off with the double use of heat. By indirect heat exchange of separated warm water with oil plus dried solids being heated sensible heat losses are kept small.