【Test Your Knowledge】Basic Chemical Engineering Knowledge (39)

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For the convenience of others, please write down the answers directly; do not paste the original questions, otherwise no marks will be given. Thank you for your cooperation! 1. Polymer compounds are generally polydisperse; therefore, their molecular weight has only a statistical average meaning. The commonly used values for molecular weight include _________, ___________, etc. 2. Distillation, absorption, extraction, etc., all belong to chemical engineering _______________. 3. Common respiratory protection devices are divided into ___________ and _________ two types. 4. Industrial toxins are classified into two major categories based on their chemical structure: _________ and __________. 5. The reflux methods for distillation towers include ___________, ____________. 6. The chemical substances that delay or prevent polymers from deteriorating due to oxidation during storage, transportation, use, and processing are called ____________________. 7. A polymerization reaction in which only one type of monomer is involved is called a _________ reaction, while a polymerization reaction involving two or more types of monomers is called a _______________ reaction. 8. The methods for polymer modification include _________, _________, __________. 9. Generally, synthetic polymer compounds are mixtures composed of similar polymers with identical constituent (structural) units but different molecular sizes; this phenomenon is known as the _________ of polymer compounds. 10 In industrial production, catalysts that have been accidentally poisoned can usually be regenerated using ____________, __________________ or ___________. Answer key: 1 Number-average molecular weight, Weight-average molecular weight 2 Unit operation 3 Filtration type, Isolation type 4 Inorganic toxins, Organic toxins 5 Natural reflux, Forced reflux 6 Antioxidants 7 Homopolymerization, Copolymerization 8 Physical methods, Physicochemical methods, Chemical methods 9 Polydispersity 10 Hydrogen, Air, Water vapor Last edited by zhangyong6404 on 2009-4-22 16:59]