China Chemical Siding Ningbo Engineering has obtained a patent titled “A four-stage purification device for producing high-purity acrylic acid by crystallization”

Thread Content

According to news from February 18, 2025, **information from the Intellectual Property Office shows that China Chemical Saiding Ningbo Engineering Co., Ltd. has obtained a patent titled “A four-stage purification device for producing high-purity acrylic acid by crystallization,” with the approval announcement number CN 222488955 U. The application was submitted in January 2024.** The patent abstract indicates that this utility model discloses a four-stage purification device for producing high-purity acrylic acid by crystallization. It is characterized by including a falling-film crystallizer, a receiving tank, a product tank, stage 1 and stage 2 storage tanks, stage 3 storage tank, stage 4 storage tank, and a static crystallizer. The falling-film crystallizer, the receiving tank, and the product tank are connected in sequence from top to bottom. The discharge outlet at the bottom of the receiving tank is connected to the product tank, as well as to stage 2, stage 3, and stage 4 storage tanks of the falling-film crystallizer. The discharge outlet at the bottom of the product tank is connected to an output pump ； The upper end of the fourth-stage storage tank is connected to a large-diameter inlet pipe for the acrylic acid raw material. The fourth-stage storage tank, the third-stage storage tank, and the second-stage storage tank are each connected to the upper feed inlet of the receiving tank, while the first-stage storage tank is connected to the top feed inlet of the static crystallizer. The bottom discharge outlet of the static crystallizer is connected to the second-stage storage tank, the first-stage storage tank, and the residual acid collection pipe. The advantage of this setup is that it enables continuous production and increases the yield of high-purity acrylic acid product.