Search

PRE-EVAPORATION CHOICES For INCREMENTAL EVAPORATIVE CAPACITY

PRE-EVAPORATION CHOICES For INCREMENTAL EVAPORATIVE CAPACITY In EXISTING MILLS, 2017PEERS

The Use of Parametric Analysis to Identify Opportunities for

The Use of Parametric Analysis to Identify Opportunities for Improved Operations of Lime Kilns, 2017PEERS

Update on Optimizing Black Liquor Recovery Throughput and In

Update on Optimizing Black Liquor Recovery Throughput and Increase Campaign Life with Chemical Additives, 2017PEERS

RECOVERY BOILER SCR • A CHALLENGE AND ANOPPORTUNITY IN RETRO

RECOVERY BOILER SCR • A CHALLENGE AND ANOPPORTUNITY IN RETROFIT CASES, 2017PEERS

Plant and Boiler Energy Efficiency Evaluations, 2017PEERS

Plant and Boiler Energy Efficiency Evaluations, 2017PEERS

Closed-Loop Vacuum Control in Papermaking: A Data-Driven Approach to Wet End Optimization, TAPPICon26

Preparing prehydrolyzed kraft dissolving pulp via phosphotungstic acid prehydrolysis from grape branches, TAPPI Journal January 2022

ABSTRACT: Dissolving pulp was successful prepared via phosphotungstic acid (PTA) prehydrolysis kraft (PHK) cooking followed by an elementary chlorine-free (ECF) bleaching process from grape branches. The effects of prehydrolysis temperature, reaction time, and PTA concentration that potentially affect the quality of dissolving pulp product on chemical components of pulp were studied via an orthogonal experiment. The structure of lignin was activated during the PTA prehydrolysis phase, and lignin was easily removed during the following cooking process. Thus, relatively mild conditions (140°C, 100 min) can be used in the cooking process. During the prehydrolysis phase, temperature exhibited the most significant influence on the cellulose purity of the obtained pulp fiber, followed by reaction time and PTA concentration. The optimized prehydrolysis conditions were as follows: prehydrolysis temperature, 145°C; reaction time, 75 min; and PTA concentration, 1 wt%. Whether the excessively high prehydrolysis temperature or prolonging the reaction time did not favor the retention of long chain cellulose, the delignification selectivity for the cooking process could not be further improved by excessive PTA loading. Under these prehydrolysis conditions, 94.1% and 29.0% for a-cellulose content and total yield could be achieved after the given cooking and bleaching conditions, respectively. Moreover, the chemical structure and crystal form of cellulose were scarcely changed after PTA prehydrolysis, which could be confirmed by results from Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD). PTA prehydrolysis could be considered as an alternative method for preparing PHK dissolving pulp under relatively mild cooking conditions.

You have several bleaching stages, why don’t you use them?, 2022PEERS/IBBC Conference (22PEE/22IBB)

DD-washer performance optimization using the latest measurement technology, 2022PEERS/IBBC Conference (22PEE/22IBB)

FIXED EQUIPMENT MECHANICAL INTEGRITY, 2022PEERS/IBBC Conference (22PEE/22IBB)