Core Viewpoint - China Petroleum & Chemical Corporation (Sinopec) has applied for a patent for a method and system for purifying propylene glycol through a dual solvent extraction coupled with distillation process, which aims to enhance product yield and quality [1]. Company Overview - China Petroleum & Chemical Corporation, established in 2000, is primarily engaged in oil and gas extraction, with a registered capital of approximately 12.17 billion RMB [2]. - Sinopec has invested in 263 companies and participated in 5,000 bidding projects, holding 45 trademark records and 5,000 patent records [2]. - Sinopec (Dalian) Petrochemical Research Institute, founded in 2022, focuses on research and experimental development, with a registered capital of approximately 338.46 million RMB [2]. - The Dalian Institute has invested in 1 company and participated in 1,172 bidding projects, holding 4,658 patent records [2].