Treatment of polysaccarides with dialdehydes

摘要

A process for treating a polysaccharide with a dialdehyde in the presence of from 10 to 40 weight percent of water, based on the total weight of polysaccharide and water, is beneficially conducted in a mixing device characterized by a FROUDE number FRw of larger than 11, wherein ωw is the angular frequency in sec-1 and is defined as 2*π*RPM/60, RPM is the rotational speed of the mixing device in revolutions per minute, Rw is the radius of the mixing device in m, and g is the acceleration due to gravity in m/s2.;Frw=ωw2⁢Rwg

主权项

1. A process for treating a cellulose ether with 0.1 to 4% by weight, based on dry cellulose ether, of a dialdehyde in the presence of from 10 to 40 weight percent of water, based on the total weight of cellulose ether and water, in a mixing device characterized by a FROUDE number FRw of at least 200, whereinFrw=ωw2⁢Rwg, wherein ωw is the angular frequency in sec−1 and is defined as 2*π*RPM/60, RPM is the rotational speed of the mixing device in revolutions per minute, Rw is the radius of the mixing device in m, and g is the acceleration due to gravity in m/s2.