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Bian Y.,Shandong Shanda Wit Science and Technology Co.
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2012

The white mud from chemical recovery process of kraft pulping normally is greenish. The whiteness of precipitated calcium carbonate prepared from the white mud by the reported technology didn't meet the requirement of paper making. The whiteness of the precipitated calcium carbonate is above of 90%ISO by adding 1 mL DTPMP in the white mud at 35°C and pH=9.5 based on orthogonal experiment. Source


Ding H.,North China Electrical Power University | Fan X.,North China Electrical Power University | Li C.,North China Electrical Power University | Liu X.,Shandong University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2013

In this work, the first principles calculation has been performed to study the hydrogen storage in non-stoichiometric TiCx. It is found that hydrogen absorption in stoichiometric TiC is energetically unfavorable, while it is favorable in non-stoichiometric TiCx. This indicates that the existence of carbon vacancies is essential for hydrogenation storage in TiC x. At the same time, multiple hydrogen occupancy of the vacancy has been confirmed and it is calculated that as many as four hydrogen atoms can be trapped by a carbon vacancy. These absorbed hydrogen atoms tend to uniformly distribute around the vacancy. However, it is also found that the diffusion of hydrogen atoms in TiCx is difficult, especially in TiCx with high x. © 2012 Elsevier B.V. All rights reserved. Source


Meng Q.-H.,Shandong Shanda Wit Science and Technology Co. | Yang G.-Y.,Shandong Shanda Wit Science and Technology Co. | Zhang B.,Shandong Shanda Wit Science and Technology Co.
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2013

Chloride dioxide is the first choice of elementry chlorine free bleaching (ECF) in modern pulp mills. But it is prone to decomposition during the preparation and will cause safety problem. With methanol preparation process as an example, the safety of process design are described in this paper. The dangerous chemicals, chlorine dioxide protection, system safety design, interlock control design and material selection are emphasized. Source


Zhao S.-Y.,Shandong Shanda Wit Science and Technology Co. | Wang B.-F.,Shandong Shanda Wit Science and Technology Co. | Meng Q.-H.,Shandong Shanda Wit Science and Technology Co.
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2011

The preparation process of chlorine dioxide (ClO 2) using for pulp bleaching is introduced. Factors influencing ClO 2 production efficiency and yield are analyzed based on reaction theory and conditions. The measures to increase ClO 2 reaction efficiency and yield are discussed. Source

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