Producer
Syensqo (formerly Solvay Specialty Chemicals)
Specialty chemicals company spun off from Solvay SA on December 9, 2023; inherited Solvay's specialty chemicals portfolio including the Aroma Performance business unit (vanillin + hydroquinone). Self-described 'world's largest integrated producer of synthetic and natural vanillin.' Holds ~18% global vanillin market share. Filed 2024 US antidumping/countervailing duty petitions against Chinese vanillin imports. Announced intent to divest the Aroma Performance unit (no buyer named as of early 2026). Saint-Fons, France plant mothballed May 2024 due to Chinese competition; restarting late 2025 after EU imposed 131% anti-dumping duties on Chinese vanillin.
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Inputs supplied
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Goods downstream
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Facilities
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Stories
What they make
2 inputs Syensqo (formerly Solvay Specialty Chemicals) supplies
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Where they make it
2 facilities
Syensqo Marietta Ohio Polysulfone Plant →
USOhio · processing
Syensqo (formerly Solvay) primary US polysulfone production site in Marietta OH; November 2024 expansion increased Udel PSU capacity by more than 25% to serve dialysis membrane, healthcare instrument, and water filtration demand; produces Udel P-3500 LCD MB (low cyclic dimer, dialysis grade); complements Augusta GA site that makes DCDPS building block
Syensqo Saint-Fons Vanillin Plant (Mothballed/Restarting) →
FRSaint-Fons, Auvergne-Rhône-Alpes, near Lyon · chemical_plant
Primary European synthetic vanillin production site; mothballed May 2024 due to 'inflation, declining demand, and intensified Asian competition.' Restarting late 2025 (creating ~25 jobs) after EU imposed 131% anti-dumping duties on Chinese vanillin. Syensqo also has facilities at Baton Rouge LA (US) and Zhenjiang China. This plant's closure-and-restart cycle within 18 months illustrates how trade policy can restructure an entire commodity chemical market.
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Business segments
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Aroma Performance (Vanillin & Guaiacol)
20%Specialty Polymers
30%Composite Materials
25%Technology Solutions
25%
Intelligence
What's known
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Incident2024
In May 2024, Syensqo mothballed its Saint-Fons, France vanillin plant — Europe's largest — due to 'inflation, declining demand, and intensified Asian competition.' In November 2024, the EU imposed 131% anti-dumping duties on Chinese vanillin. By late 2025, Syensqo announced the plant's restart, creating ~25 jobs. Within 18 months, a trade policy decision reversed a corporate mothballing decision at the world's second-largest vanillin producer. This plant closure-and-restart cycle illustrates how anti-dumping duties can structurally reshape an entire specialty chemical market — and how fragile Western vanillin capacity had become without tariff protection.
Syensqo SA/NV ↗Origin2024
Solvay split into two independent publicly-traded companies on December 9, 2023: the original Solvay (keeping basic chemicals) and Syensqo (inheriting specialty polymers and solutions). Syensqo inherited the Udel® polysulfone brand, which has been the benchmark dialysis-grade polysulfone for over 25 years. In November 2024, Syensqo announced a 25%+ capacity expansion at its Marietta, Ohio facility to meet growing demand in dialysis, water filtration, and hydrogen electrolyzer applications. The Udel P-3500 LCD MB grade (low cyclic dimer, membrane-optimized) is the specific grade required for dialysis hollow fiber membrane spinning.
Syensqo ↗