Research and industrial application of coupled impurity removal technology in CHPPO process oxidation liquids
Cumene hydroperoxide(CHPPO)is a new green process for producing propylene oxide.However,how to remove impurities such as organic acids and Na+from the cumene oxidation solution has always been a key issue in the CHPPO process.Addressing problems like high investment,large footprint,and poor mass transfer effects of existing alkali water washing tower units,a coupled impurity removal technology based on static mixing and coalescence separation was developed through pilot and semi-industrial trials.This research also studied the effect of various operational conditions on the separation performance of the coupled technology,achieving efficient impurity removal from cumene oxidation liquid.The results show that under conditions with a 1.5%NaOH solution concentration,alkali solution usage at 4%—5%of the oxidation liquid feed volume,pure water usage at 3%—5%,and self-circulation volume at 10%—15%,the processed oxidation liquid had a total acid content below 10 mg/L and Na+content below 0.5 mg/L.Furthermore,the coupled impurity removal technology was industrially applied for the first time in a petrochemical setting,resulting in processed oxidation liquid with an organic acid content of 33 mg/L and Na+content of 0.4 mg/L,meeting the technical requirements for pretreatment in the epoxidation section.This also led to a 5%reduction in alkali and water usage,significantly enhancing the green attributes of the facility.This technology offers a highly promising option for solving deep purification issues in oxidation liquids and advancing the development of the epichlorohydrin synthesis process.
CHPPOCHP oxidation liquidcoalescencemass transferseparationalkali and water washing
国家科技期刊平台
NSTL
万方数据
