After the modification,the reactive time was shortened by half of the conventional process,and the ratio of utilization of DCPA increased from 75% to 80%,the yield of phosgene,from 38% to 75%.

• 工艺改造后,反应周期缩短了一半,DCPA的收率由75%25提高到80%25,光气收率由38%25提高到75%25。