■ DCS outputs esterification rate online and in real time, which meets the development needs of intelligent chemical plants. The process control scheme can be adjusted within the shortest time so as to ensure continuous and stable production and terminal quality.

■ It reduces the timing delay caused by abnormal esterification rate and test delay as well as the significant loss ascribed to waste discharge, defective products and startup and shutdown.

■ It reduces manual sampling dangers and reduces the labor and reagent costs of laboratory testing dramatically.

■ It reduces the analysis frequency (2~ 3 times every week only) dramatically, in comparison to on-line esterification rate.

■ It eliminates errors caused by the factors such as analytical reagents and instruments, human operation and sampling methods.