Polymer Problems Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
What are the current methods for disposing of polymers? | landfill, incineration and recycling |
Why can we not continue to use landfill as a method? | UK landfill space will run out |
Why should plastics be recycled? | non biodegrability |
Problems with recycling. | plastic waste contains heavy metal ions and colourants |
Why is simply reusing plastics better? | no processing therefore saves energy and oil resources |
First stage of recycling | sorting (using optical scanning techniques) |
Why is it important to sort the plastics? | distinguish PVC as when heated releases toxic dioxins |
Second stage of recycling | reclamation (processing into small flakes before washing) |
Alternative use for waste polymers | burning under controlled conditions to generate electricity |
Another alternative use | feedstock recycling, convert polymers into synthesis gas to then use as a chemical feedstock |
Problems with PVC recycling | high chlorine content makes PVC recycling uneconomical end product costs more to recycle than manufacture from crude oil |
What happens to PVC instead? | PVC is incinerated to prevent from entering landfill |
Problems with PVC incineration | create acidic hydrogen chloride fumes resulting in toxic fumes and corrosion in the plant |
What does the plant do to minimize these problems | plant is fitted with pollution control apparatus to minimise release. |
What are bioplastics | plastics that are biodegradable or compostable |
What are bioplastics made from? | starch, maize, cellulose and lactic acid. |
How do bioplastics degrade? | bacterial activity |
What do bioplastics degrade to? | carbon dioxide and water |
Created by:
07blandforderin
Popular Chemistry sets