Abstract: In order to resolve the problems of material bonded stirrer in reactor, insufficiency condensation of gas and off-gas exceed standard in the pilot-scale product line of biology-base epoxy hardener, the process system was reformed. The feed pipe was lengthened, the feed was directly added into the eddy range of stirrer and timely reacted with the material in the reactor, which could reduce the viscosity of material and resolve the bond problem. And the heat exchanging area of the condenser was checked on the basis of heat load of vapor and the old condenser was changed so that the content of the non-condensable organic gas reduced. By improving the production line, the off-gas reached the environmental requirements and the production efficiency improved with the productivity increasing fourfold.

Key words: hardener, reactor, bonding, non-condensable gas