Primary application sector of acrylonitrile:\nAcrylonitrile is predominantly used in which industry?

Introduction / Context:
Acrylonitrile (AN) is an important monomer for several major polymers and copolymers. Knowing its main industrial destination helps connect monomer markets to end-use materials such as acrylic fibres and engineering plastics (ABS, SAN, NBR).

Given Data / Assumptions:

• Acrylonitrile is a vinyl monomer with a nitrile group.
• Large-scale consumption occurs in polymerisation processes.

Concept / Approach:
The polymer industry is the principal consumer of AN: it is polymerised to polyacrylonitrile (PAN) for acrylic fibres and copolymerised with butadiene and styrene to make ABS plastics. Other listed industries do not use AN as a major feedstock compared with polymer manufacture.

Step-by-Step Solution:

Verification / Alternative check:
Market reports show the overwhelming share of AN demand comes from acrylic fibres and ABS/SAN resins.

Why Other Options Are Wrong:

• Printing/dyeing/photographic: not primary bulk consumers of AN.

Common Pitfalls:
Confusing acrylonitrile (monomer) with acetonitrile (solvent) used in HPLC and other labs.

Final Answer:
Polymer