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among these, wheat straw and rice straw—due to their abundant availability and low cost—are currently the primary raw materials for China's paper industry

Fiber raw materials form the material foundation of the papermaking industry.

This paper investigates sodium disulfite bleaching under the following process conditions: Na₂S₂O₄ at 1.0% concentration (5%), pH 5.5, temperature 60°C, and DTPA at 0.1%. The experimental results showed a whiteness value of 68.7% ISO and a potassium permanganate value of 2.6.

This paper investigates the completely chlorine-free bleaching of rice straw ammonium sulfamate pulp, with a focus on the OAP bleaching process workflow.

Compared to using ammonium bicarbonate as the ammonia source, employing liquid ammonia requires an additional water cooling system in the neutralization section and a liquid ammonia storage tank in the feedstock section.

ammonium sulfite from sulfuric acid tail gas is economically profitable

As shown in Tables 5 to 8, the ammonia-ammonium sulfite method is relatively simple and involves lower equipment construction costs.

The ammonium sulfite production process is simple and involves low construction costs.

Ammonium sulfite is also a sulfur fertilizer

In potted rice and wheat grown in different soils, the application of ammonium sulfite significantly increased yields compared to no application

Ammonium sulfite is recommended for use as an agricultural fertilizer.

Markings, labels, and packaging

Ice acetic acid-sodium acetate buffer solution: (pH approximately equal to 6)

The arithmetic mean of parallel determination results was taken as the final determination result.

The absolute error of parallel determination results does not exceed 0.35%.