Understanding Polyethylene Terephthalate (PET)

Polyethylene Terephthalate, commonly known as PET, is a widely used thermoplastic polymer resin of the polyester family. It is primarily used in synthetic fibers (polyester), beverage containers, food containers, and thermoforming applications. Let's analyze the given statements about PET.

Analyzing Statements about PET Properties and Uses

Statement 1: Its fibres can be blended with wool and cotton fibres to reinforce their

This statement discusses the use of PET in fibrous form, known as polyester. Polyester fibers are well-known for their strength, durability, and wrinkle resistance. They are frequently blended with natural fibers like cotton and wool. This blending improves the performance of the natural fibers, adding strength, improving dye retention, enhancing wrinkle recovery, and reducing shrinkage. Therefore, this statement is accurate regarding the use of PET fibers.

Statement 2: Containers made of it can be used to store any alcoholic

PET containers are commonly used for packaging various beverages, including some alcoholic ones like beer and certain wines. However, stating that they can store "any" alcoholic liquid might be an overgeneralization. Factors such as the concentration of alcohol, storage temperature, and duration of storage can affect the suitability of PET for certain alcoholic beverages, especially high-proof spirits. There can be concerns about potential migration of substances or degradation over very long periods, although for typical consumer uses with lower alcohol content, PET is often deemed safe. Given the word "any", this statement is likely too broad to be considered universally correct.

Statement 3: Bottle made of it can be recycled into other

PET is one of the most commonly recycled plastics globally. PET bottles and containers are collected and processed into recycled PET (rPET). This rPET can be used to create a variety of new products, including new PET bottles, polyester fibers for clothing (like fleece), carpets, strapping, and other packaging materials. The process of recycling PET into other useful articles is well-established and widespread. Therefore, this statement is correct.

Statement 4: Articles made of it can be easily disposed of by incineration without causing greenhouse gas

Incineration, or burning, of plastics like PET is a disposal method, but it is not true that it occurs without causing greenhouse gas emissions. PET is a carbon-based polymer. When burned, it reacts with oxygen to produce carbon dioxide ($$\text{CO}_2$$), which is a primary greenhouse gas. While modern incinerators may have advanced filtration systems to capture other pollutants, the production of $$\text{CO}_2$$ from the combustion of the carbon structure of the plastic is inherent to the process. Therefore, this statement is incorrect.

Summary of Statement Analysis

Based on the analysis:

• Statement 1: Correct (PET fibers blended with wool/cotton)
• Statement 2: Incorrect (Cannot store 'any' alcoholic liquid without limitations)
• Statement 3: Correct (PET bottles can be recycled into other articles)
• Statement 4: Incorrect (Incineration causes greenhouse gas emissions)

Thus, the correct statements are 1 and 3.

Conclusion: Identifying the Correct Option

The statements that are correct are 1 and 3. We need to find the option that corresponds to this pair.

The option that lists statements 1 and 3 as correct is the correct answer.

Therefore, statements 1 and 3 are correct.

Revision Table: Key Facts on PET

Additional Information: PET Recycling Process

Recycling of PET involves several steps:

• Collection: Used PET containers are collected through curbside programs or drop-off centers.
• Sorting: The collected materials are sorted to remove other plastics, metals, and contaminants.
• Washing and Grinding: Sorted PET is washed to remove labels and residue, then ground into small flakes.
• Further Processing: The flakes can undergo further cleaning and processing, which may include separation by density, rinsing, and drying.
• Reprocessing: The clean PET flakes are melted and extruded into pellets or directly into new products like fibers or films. Advanced methods can depolymerize PET back into its constituent monomers for purification and repolymerization into high-quality resin.

This recycling process helps reduce the need for virgin PET production, saving energy and reducing landfill waste. The high recyclability of PET is a significant environmental advantage compared to some other plastics.