Chemical treatment in mechanical pulping, Part 5: sulfite pretreatment.Application: For sulfite sulfite /sul·fite/ (sul´fit) any salt of sulfurous acid. sul·fite n. A salt or ester of sulfurous acid. treatment in mechanical pulping systems, this study shows that process conditions and equipment use are important in pulp property development and process efficiency. This investigation looked at the following three methods of applying sulfite for chip pretreatment pretreatment, n the protocols required before beginning therapy, usually of a diagnostic nature; before treatment. pretreatment estimate, n See predetermination. in refiner mechanical pulping: 1. Atmospheric impregnation impregnation /im·preg·na·tion/ (im?preg-na´shun) 1. fertilization. 2. saturation (1). impregnation 1. the act of fertilizing or rendering pregnant. 2. saturation. followed by rotary valve or plug screw feeding into a pressurized pres·sur·ize tr.v. pres·sur·ized, pres·sur·iz·ing, pres·sur·iz·es 1. To maintain normal air pressure in (an enclosure, as an aircraft or submarine). 2. cooking vessel 2. Chemical application directly into the pressurized cooking 3. Altered chemical liquor temperatures (25 [degrees] C and 160 [degrees] C) before application onto the chips. The investigation used a large pilot scale operation (12-20 o.d. metric ton/day, 36 inch diameter refiners). The results demonstrated that the three methods of chemical application had differing effects on process efficiency or pulp property development. It is, therefore, important to select proper equipment and designing in CTMP CTMP Comprehensive Treatment and Management Plan CTMP Chemico-Thermomechanical Pulping CTMP CONUS Telephone Modernization Program CTMP Cisco Technology Migration Program CTMP Competitive Technology Migration Plan CTMP Cisco Technology Migration Plan pulping. Xu is with the Andritz Inc. R&D Lab, Springfield, Ohio. Email Xu at eric.xu@andntz.com. |
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