European Patent Office upheld Solvay’s soda ash recycling patent, strengthening intellectual property protection, sustainable production technologies, and market competitiveness.
Solvay has announced a significant legal and technological achievement as the European Patent Office (EPO) has upheld its European patent EP 3 971 138 B1 (EP ‘138), reinforcing the company’s intellectual property rights in advanced soda ash recycling technologies. The decision follows opposition proceedings initiated by WE Soda Ltd on February 13, 2025. After oral hearings conducted on May 19, 2026, the EPO confirmed the validity of the patent with only minor amendments. Although the ruling can still be challenged through an appeal process, the decision strengthens Solvay’s position in protecting its innovative manufacturing technologies.
The EP ‘138 patent, originally granted in May 2024, covers Solvay’s proprietary process designed for the treatment and recycling of purge streams generated during the production of sodium carbonate (soda ash) and sodium bicarbonate. This technology enables the company to recover and reuse valuable materials from production waste streams, improving resource efficiency, reducing environmental impact, and enhancing the sustainability of soda ash manufacturing. The patent protection also extends to manufacturing processes that incorporate this recycling method and the resulting soda ash and sodium bicarbonate products obtained through the patented technology.
The EPO’s decision represents an important milestone in Solvay’s broader strategy to safeguard its technological innovations in the global soda ash industry. The EP ‘138 patent is part of a larger patent portfolio that includes European patent EP 2 878 579 B1 (EP ‘579), which has also been at the center of ongoing legal disputes between Solvay and WE Soda.
The conflict between the two companies began in August 2021, when Solvay filed patent infringement proceedings before Dutch courts against WE Soda, along with several of its subsidiaries and affiliates, including certain Turkish entities. Solvay alleged that sodium carbonate products manufactured using specific treatment methods at the Kazan Soda production facility infringed the Dutch designation of its EP ‘579 patent.
In December 2025, the Dutch court delivered a favorable ruling for Solvay by confirming the validity of the EP ‘579 patent. The court ordered various legal remedies, including an injunction requiring the defendants to stop importing and supplying the disputed soda ash products into the Netherlands following service of the judgment. However, WE Soda and the involved entities have challenged the decision, and the appeal proceedings remain ongoing.
The recently upheld EP ‘138 patent provides Solvay with additional strategic advantages because it is registered as a unitary patent under the European patent framework. This allows the company to initiate infringement actions before the Unified Patent Court (UPC), enabling a single legal action to cover at least 18 European countries simultaneously. Such protection gives patent holders a stronger and faster mechanism to prevent the import and sale of products that violate their intellectual property rights across multiple markets.
By securing its patent rights, Solvay aims to maintain fair competition within the soda ash industry and ensure that investments in research, process improvements, and sustainable manufacturing technologies are adequately protected. The company has reiterated its commitment to actively defending its intellectual property portfolio worldwide and pursuing strong legal measures against any organizations that use its protected technologies without authorization.
Overall, the EPO’s decision strengthens Solvay’s technological leadership in sustainable soda ash production. The ruling may influence competitive dynamics within the European market by limiting the use of similar recycling technologies by competitors and encouraging greater investment in innovative, environmentally efficient soda ash production processes.
Market Impact on Soda Ash
The EPO’s decision to uphold Solvay’s soda ash recycling patent is expected to have a slightly bullish impact on the European soda ash market, particularly in terms of supply dynamics and production costs. The ruling strengthens Solvay’s exclusive rights over advanced recycling processes, potentially restricting competitors that rely on similar technologies, especially those involved in imports into Europe. This could tighten the availability of certain low-cost soda ash supplies in the European market and provide mild upward support to regional soda ash prices.
For Solvay, the patent protection enhances production efficiency through improved recovery and recycling of process streams, helping reduce waste, lower operating costs, and maintain stable output over the long term. However, the overall global soda ash market is unlikely to witness a significant price increase because global supply remains diversified with large producers in Turkey, China, and the United States. Therefore, the impact is expected to be more pronounced in Europe, with moderate support for prices and increased emphasis on sustainable production technologies.
