Meilan Chemical in Taixing City has obtained a patent for a low-temperature photochlorination production facility for dichloroethane that enables effective control of the reaction temperature

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According to news from July 25, 2025, **information from the Intellectual Property Office shows that Taixing Meilan Chemical Co., Ltd. has obtained a patent titled “A low-temperature photochlorination production device for dichlorofluoroethane,” with the approval announcement number CN223144706U. The application was filed in September 2024.** The patent abstract indicates that this utility model relates to a device for the low-temperature photochlorination of dichloroethane. Multiple reaction tubes arranged vertically are placed inside the photochlorination reactor; the lower end of each reaction tube is connected to a feed inlet, while the upper end is connected to a discharge outlet. Several UV chlorination chambers are located vertically within the photochlorination reactor, and the reaction tubes pass through these chambers, connecting them together. UV lamps are installed within the chlorination chambers. The outer wall of the photochlorination reactor is equipped with a graphite heat exchanger, or the inner wall may also be fitted with such a heat exchanger. The space between the graphite heat exchanger and the reaction tubes serves as a cooling water chamber, which runs vertically throughout the reactor. The lower part of this cooling water chamber is connected to a water inlet pipe, and its upper part is connected to a water outlet pipe. At the highest point of the cooling water chamber beneath each chlorination chamber, a circulation pipe is connected; this circulation pipe is linked via a control valve to a three-way valve installed on the water inlet pipe. According to Tianyancha, Taixing Meilan Chemical Co., Ltd. was established in 2005 and is located in Taizhou City; it is a company that focuses on the manufacturing of chemical raw materials and chemical products. The registered capital of the enterprise is 8 million RMB. According to the big data analysis provided by Tianyancha, Taixing Meilan Chemical Co., Ltd. has participated in 7 bidding projects and holds 52 patent records; in addition, the company possesses 19 administrative licenses.