Chromium-based Catalyst MethodAmong many preparation processes, the synthesis of hydroxypropyl acrylate hpa using chromium-based catalysts is a traditional process route. Chromium-based catalysts mainly include chromium trichloride, chromium trioxide, and chromium acetate. They have relatively high catalytic activity but are difficult to prepare and the process is hazardous. Chromium-based catalysts are often used in combination with catalytic additives and polymerization inhibitors during use. In particular, chromium trioxide is a strong oxidant with extremely strong oxidizing properties and corrosiveness, making its storage and transportation very dangerous.Since chromium is a heavy metal, it has teratogenic and carcinogenic effects. Moreover, after product purification, it mainly exists in the residual liquid, which has a high viscosity and makes the recovery and treatment of chromium acetate difficult. The development of green, safe, and environmentally friendly catalysts and processes has become a research hotspot in academia.

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