Method of Improving absorption of salt water by water-swellable

Details Method of Improving absorption of salt water by water-swellable Method of Improving absorption of salt water by water-swellable

1993-11-18

1995-06-27

Pal, Asok

Catalyst, solid sorbent, or support therefor: product or process

Zeolite or clay, including gallium analogs

Clay

501100, 501149, C09K 700

Patent

active

054279909

ABSTRACT:
A method of treating a water-swellable clay after the clay has been mined and dried to improve its properties when in contact with salt-contaminated water. After the common initial drying of the clay to a moisture content of 12% by weight or less, the clay is rewetted to a moisture content of more than 12% by weight, preferably at least about 15% or more, based on the dry weight of the clay, then redried to a moisture content of 12% by weight or less, based on the dry weight of the clay. This rewetting and redrying processing of a dried clay unexpectedly improves the salt water absorbency, and viscosity properties when the clay is in contact with salt-contaminated water; unexpectedly increases the rheology properties of the clays for oil well drilling fluids and lost circulation fields when salt-contaminated water is encountered during drilling, as a suspending agent in the cosmetics and pharmaceutical industries when the composition contains a dissolved salt; and provides unexpectedly increased salt water-absorption in forming water-swellable clay-based water barriers.

REFERENCES:
Applied Clay Mineralogy, by Grim, McGraw-Hill Book Co., Inc., 1962, pp. 76,77,216,217,404,405.

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