Anhydrous Liquid Ammonia

Process Mechanism

Swelling of the cotton yarn or fabric occurs when the reagent penetrates the amorphous and crystalline regions. The application of anhydrous liquid ammonia converts the natural cellulose I structure into a more stable cellulose III polymorphic form. The reaction is terminated by a rapid wash with water or hot air.

Cotton treated in this manner exhibits higher resistance to creasing and less shrinkage during subsequent laundering. This process relaxes internal stresses within the polymer chains, yielding a smoother surface. The resulting fiber cross section becomes more circular, which enhances light reflection.

Mechanical Configuration

Industrial machinery for this treatment consists of sealed reaction chambers designed to contain the pressurized gas and recovery units. The use of anhydrous liquid ammonia demands precise temperature controls since the boiling point of the chemical is approximately minus thirty-three degrees Celsius. Low temperatures prevent premature vaporization during the wetting cycle.

Automated sensors monitor the concentration and pressure within the vessel to maintain a stable environment.

Recovery Circuit

Recovery systems must capture and condense the evaporated reagent to recycle it back to the main holding tank. An efficiency rate exceeding ninety-five percent is required to keep operational costs low and to comply with environmental standards. Distillation columns separate the ammonia from water contaminants introduced during the rinsing phase.

Safe handling protocols dictate continuous air monitoring in the workspace to detect leaks early.