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Magazine articles
Effects of phosphogypsum whiskers modification with calcium stearate and their impacts on properties of bleached softwood paper sheets, TAPPI Journal September 2021
ABSTRACT: By combining the structural properties and characteristics of phosphogypsum whiskers, a preliminary study on the modification of phosphogypsum whiskers and their application in papermaking was carried out. The effects of reaction temperature, reaction time, and reaction concentration on the solubility and retention of modified phosphogypsum whiskers and the effects of phosphogypsum whiskers on the physical properties of paper under different modified conditions were explored. The research results show that, after the phosphogypsum whiskers are modified with calcium stearate, a coating layer will be formed on the surface of the whiskers, which effectively reduces the solubility of the phosphogypsum whiskers. The best modification conditions are: the amount of calcium stearate relative to the absolute dry mass of the phosphogypsum whisker is 2.00%; the modification time is 30 min, and the modification temperature is 60°C. The use of modified phosphogypsum whiskers for paper filling will slightly reduce the whiteness, folding resistance, burst resistance, and tensile strength of the paper, but the tearing degree and retention of the filler will be increased to some extent.
Journal articles
Magazine articles
Evaluation of rice straw for purification of lovastatin, TAPPI Journal November 2021
ABSTRACT: Cholesterol synthesis in the human body can be catalyzed by the coenzyme HMG-CoA reductase, and lovastatin, a key enzyme inhibitor, can reduce hypercholesterolemia. Lovastatin can be obtained as a secondary metabolite of Aspergillus terreus ATCC 20542. In this study, rice straw of lignocellulose was used in aeration and agitation bath fermentation in a 1-L flask, and a maximal crude extraction rate of 473 mg/L lovastatin was obtained. The crude extract was treated with silica gel (230–400 mesh) column chromatography. Ethyl acetate/ethanol (95%) was used as the mobile phase, and isolation was performed through elution with various ethyl acetate/ethanol ratios. The highest production rate of 153 mg/L was achieved with ethyl acetate/ethanol in a ratio of 8:2. The lovastatin gained from the crude extract was added to 12 fractions treated with 0.001 N alkali, and acetone was then added. After 24 h of recrystallization at 4°C, the extract underwent high-performance liquid chromatography. The purity had increased from 25% to 84.6%, and the recovery rate was 65.2%.
Journal articles
Magazine articles
Editorial: Collaboration: A necessary recipe for technological growth, TAPPI Journal September 2021
ABSTRACT: Ongoing crisis situations, such as COVID-19 and the oil spill on the Orange County beaches in California, clearly highlight the need for various forms of collaboration, be it technical or trade. Technological growth in any sector these days depends on knowhow from multiple fields.
Magazine articles
VIEWPOINT: Profit Yearning = Market Churning, Solutions!, Ap
VIEWPOINT: Profit Yearning = Market Churning, Solutions!, April 2006, Vol. 89(4) (51 KB)
Magazine articles
Save Energy By Optimizing Paper Machine Clothing, Solutions!, April 2006, Vol. 89(4) (322 KB)
Save Energy By Optimizing Paper Machine Clothing, Solutions!, April 2006, Vol. 89(4) (322 KB)
Magazine articles
Energy Efficiency Drives Maintenance Trends, Solutions!, April 2006, Vol. 89(4) (560 KB)
Energy Efficiency Drives Maintenance Trends, Solutions!, April 2006, Vol. 89(4) (560 KB)
Magazine articles
A Sweet Future for Bio-Fuels?, Solutions!, February 2006, Vol. 89(2) (40 KB)
A Sweet Future for Bio-Fuels?, Solutions!, February 2006, Vol. 89(2) (40 KB)
Magazine articles
Water Treatment: Striking a Balance, Solutions!, February 2006, Vol. 89(2) (275 KB)
Water Treatment: Striking a Balance, Solutions!, February 2006, Vol. 89(2) (275 KB)
Magazine articles
Technological Competition: A Must for Forest Products, Solutions!, February 2006, Vol. 89(2) (313 KB)
Technological Competition: A Must for Forest Products, Solutions!, February 2006, Vol. 89(2) (313 KB)
Magazine articles
UPM Changshu: Finland on the Yangtze, Solutions!, January 2006, Vol. 89(1) (404 KB)
UPM Changshu: Finland on the Yangtze, Solutions!, January 2006, Vol. 89(1) (404 KB)