New chlorine-free bleaching process for straw pulp

Du Junqi, a professor at Beijing University of Chemical Technology, used his potassium-based hydrogen peroxide+oxygen technology and equipment, combined with the neutral-aniline-based pulping technology of the 1970s, to successfully develop the “Neutral Iodine Method + Potassium Hydrogen Peroxide + Oxygen”. Bleaching pulping, cleaner production, and parallel production of multi-element compound-containing organic fertilizers can achieve the recycling flow of “resources, products, renewable resources, and recycled products”, and basically achieves zero discharge of pulping wastewater. Wastewater from Papermaking Industry, Exploring New Processes for Integration of Pulp and Paper Fertilizers with Chinese Characteristics. At the same time, the cost of construction recovery and sewage treatment in the raw alkali pulping process can be saved. The sales of the combined production fertilizer can increase the income. The neutral organic ammonium method organic waste liquid (having a certain viscosity) can also be used for agricultural irrigation and sand-fixing measures. It is ecologically advantageous. Environmental construction. Although the price of potassium hydroxide used is relatively high, it is more than offset by the compound fertilizer revenue.

Xu Wenjun, former director of the China Society of Light Industry and Environmental Protection, and Du Junqi, Beijing University of Chemical Technology, are currently in contact with the agricultural sector and relevant units in the western region. He hopes that this process will be promoted and used.