Luzhou, China
Luzhou, China

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Qin D.,Beijing Institute of Technology | Zhang D.,Beijing Institute of Technology | Shao Z.,Beijing Institute of Technology | Wang J.,Beijing Institute of Technology | And 3 more authors.
RSC Advances | Year: 2016

TEMPO-oxidized cellulose nanofibers (TOCNs) were blended with cellulose acetate (CA) to fabricate a high water flux ultrafiltration membrane. In order to further reduce the fouling behavior of the membrane, short-chain amino acids were selected as modifiers to graft onto the membrane surface. Some properties of modified membranes had been changed such as penetrability, contact angle, zeta potential, anti-fouling and mechanical properties. It was observed that the water flux of the TOCNs composite membrane was raised from 11.8 l m-2 h-1 to 123.4 l m-2 h-1, an over 10 times increment compared with unmodified CA membrane. As reinforcing nanofibers, TOCNs also have a positive impact for the modified membrane on mechanical properties. The tensile strength and elongation at break of the composite membrane were increased by 23.9% and 40.4%, respectively. After short-chain amino acids modification, little or even no variation had been found in the cross-section morphology and pore structure of the membrane. The flux recovery ratio (FRR) of lysine modified membrane was increased from 80.0% to 95.9%, while irreversible fouling loss (Rir) decreased from 20% to 4.1%. Grafting lysine onto the membrane effectively improved the resistance to protein fouling of the membrane, without sacrificing water flux and mechanical properties. © 2016 The Royal Society of Chemistry.

Jing X.-S.,Sichuan Nitrocell Co. | Zhou B.-Y.,Sichuan Nitrocell Co. | Gao J.-Y.,Sichuan Nitrocell Co. | Chen M.,Sichuan Nitrocell Co. | And 2 more authors.
Binggong Xuebao/Acta Armamentarii | Year: 2014

Washing black liquid is a kind of waste water produced in the pressing and washing processes of refined cotton. Separate treatment of washing black liquid is relatively rare. In order to explore the degree and method of washing black liquid biochemical treatment, the two-stage anaerobic-aerobic and single aerobic processes are used to treat the washing black liquid in the pilot scale of 1 cubic meter per day. The result shows that COD of washing black liquid can be reduced from 1100 mg/L to 330 mg/L in biochemical treatment. With the coagulation of further aluminum sulfate which optimum dosage is 2.5‰ (volume ratio), COD of washing black liquid is decreased to less than 100 mg/L and the chroma achieves less than 50 times. Stench is created by sulfate reduction in the anaerobic treatment process, which decreases the activity of microorganism. Therefore, the washing black liquid is suitable for the direct coagulation treatment of aerobic-aluminum sulfate. ©, 2014, China Ordnance Society. All right reserved.

Yang H.,Sichuan Nitrocell Co. | Zhang R.-X.,Sichuan Nitrocell Co. | Tan C.-L.,Sichuan Nitrocell Co. | Peng H.,Sichuan Nitrocell Co. | Song S.-J.,Sichuan Nitrocell Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2015

The device is designed for the precipitation prilling process of cellulose acetate butyrate (CAB). The flow types of acid and slurry of CAB in their pipelines of precipitation process are analyzed. The continuous precipitation prilling process is systematically studied. The result show that the uniform CAB products are obtained by precipitation method under the following conditions: less than 10% of the concentrations of acetate acid and butyrate acid, respectively, 55℃ of precipitation temperature. At the same time, the residual acid can be easily wiped out by washing. ©, 2015, China National Chemical Information Center. All right reserved.

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