化工行业周报：维生素价格有所降温，万华化学柠檬醛投产

Investment Rating - The report indicates a positive outlook for the chemical industry, with a focus on specific segments and companies that are expected to perform well in the current market environment [5][24]. Core Insights - The overall market index has shown a decline, with the Shanghai Composite Index closing at 2842.21, down 0.43% for the week, while the Shenzhen Index increased by 2.04%. The chemical sector, however, saw an increase of 4.13% [5][10]. - Key stocks in the chemical sector that performed well include Zhen'an Technology (+24.04%), Quanwei Technology (+23.39%), and Shuangle Co. (+19.07%). Conversely, companies like Juhua Co. (-7.13%) and Jilin Carbon Valley (-6.69%) faced declines [5][14][16]. Summary by Sections Weekly Chemical Market Review - The chemical sector outperformed the broader market, with significant gains in specific stocks and segments [5][10]. - The top-performing chemical products included Shandong Methyltrichlorosilane, Palm Acid, and Butadiene Ketone, while Acetic Acid and Vitamin C saw notable declines [19][20]. Chemical Product Price Changes - The report highlights significant price movements in various chemical products, with Shandong Methyltrichlorosilane increasing by 37.50% to 1100 CNY/ton, driven by strong downstream demand [19][22]. - Conversely, Acetic Acid prices fell by 9.64% to 3064 CNY/ton due to weak downstream demand [20][23]. Focus on Industry and Company News - The report emphasizes the importance of domestic substitution in high-end optical materials, suggesting investment in companies like Stik and Dongcai Technology, which are positioned to benefit from this trend [5]. - The animal nutrition sector is also highlighted, with a recommendation to focus on companies like Meihua Biological, which are expected to benefit from rising amino acid demand amid changing feed ingredient dynamics [5]. Investment Recommendations - The report suggests monitoring high-end optical materials for domestic substitution opportunities, as well as the animal nutrition sector due to evolving market conditions [5]. - It also recommends focusing on leading chemical companies that are well-positioned to benefit from lower natural gas prices and recovering downstream demand [5].