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Production Variance in Purified Carboxymethyl Cellulose (CMC) Manufacture
Author(s) -
Stigsson Veronica,
Wilson David I.,
Germgärrd Ulf
Publication year - 2004
Publication title -
developments in chemical engineering and mineral processing
Language(s) - English
Resource type - Journals
eISSN - 1932-2143
pISSN - 0969-1855
DOI - 10.1002/apj.5500120118
Subject(s) - carboxymethyl cellulose , relevance (law) , variance (accounting) , product (mathematics) , quality (philosophy) , raw material , production (economics) , biochemical engineering , process engineering , cellulose , final product , industrial production , pulp and paper industry , chemistry , engineering , mathematics , business , organic chemistry , economics , physics , microeconomics , geometry , accounting , quantum mechanics , political science , keynesian economics , law , sodium
Abstract This study investigates the variance in industrial production of carboxymethyl cellulose (CMC). Initially it was thought that the product exhibited excessive quality variations. However careful viscosity and molecular weight distribution measurements on both the raw material and the final product, supplemented with online quality measurements, showed that the product variations were less severe than originally thought. The most probable reason for this unfounded quality concern is due to imperfect routine measurements coupled with a limited reporting of the subsequent offline laboratory analysis. The situation where the routine quality analysis plays as much a role in the uncertainty as the production itself is believed to be of general relevance for the chemical processing industries.