三友化工：公司全资子公司唐山三友精细化工有限公司投资建设的氯化亚砜年产能是4万吨，目前处于建设期

Group 1 - The core point of the article is that the company Sanyou Chemical's wholly-owned subsidiary, Tangshan Sanyou Fine Chemical Co., Ltd., is in the process of constructing a chlorosulfonic acid production facility with an annual capacity of 40,000 tons, which is currently under construction and not yet in production [2] Group 2 - The investment in the chlorosulfonic acid facility indicates the company's commitment to expanding its production capabilities in the fine chemical sector [2] - The facility's capacity of 40,000 tons per year highlights the scale of the company's investment in this area [2] - The current construction phase suggests potential future growth and revenue generation once the facility becomes operational [2]