PETER YOUNG LEE, DPT
Physical Therapy at Pacific Hwy, Auburn, WA

4297164, Oct 27, 1981

Mar 10, 1980

6/129009

Peter F. Lee - Auburn WA

Weyerhaeuser Company - Tacoma WA

D21C 906

162 60

An improved displacement washing process for recovering processing chemicals from a porous medium, particularly wood pulp, is described. The effective mobility of a displacing solution, typically a more dilute solution of the chemical sought to be recovered, is reduced such that it is less than the mobility of the solution to be recovered. In a pulp mill washing system, consumption of wash water may be reduced 0. 6 tons of water per ton of pulp produced without reducing chemical recovery. Conversely, chemical effluent from the washer could be reduced by 50% without increasing wash water requirement. Mobility is proportional to the permeability of the porous medium with respect to the solution of interest and inversely proportional to the viscosity of that solution. Mobility of the wash solution relative to the solution to be displaced is preferrably reduced by the addition of a soluble, high molecular weight polymer, greater than 10. sup. 6, until the ratio of the mobility of the wash solution to that of the chemical rich solution is in the range of 0. 05-2.

4312219, Jan 26, 1982

Mar 10, 1980

6/128600

Peter F. Lee - Auburn WA
Jeffrey A. Hinds - Sumner WA

Weyerhaeuser Company - Tacoma WA

G01N 504

73 76

An apparatus that is capable of continuously measuring the weight loss of a light weight, porous sheet material during drying while in constant contact with a heated surface. The resulting data may be converted to drying rate curves suitable for analyzing the effects on drying rate of furnish additives and processing conditions. The testing device is particularly useful for evaluating grades of paper or paperboard having basis weights greater than 50 g/m. sup. 2. The device includes an electrically heated arcuate plate maintained at a constant temperature. The paper sample to be tested is brought into good heat transfer contact with the plate by means of a tensioned fabric that exerts a normal load on the sample but does not interfere with mass transfer of the vapor away from the drying sample. An air ventilating system provides a low turbulence flow of air uniformly over the fabric covering the sample. The plate, sample and fabric are supported by a load sensor that measures changes in weight of the sample during drying to 0. 01 g.