Abstract:
Indole-3-butyric acid (IBA) is a plant hormone, used to initiate root formation. However, in case of high concentration of IBA, it affected other parts of the plant resulting no effects to the root. The amount of IBA have to be control led to not exceed the higher limit as well as controlled release. 7-hydroxy-4-chloromethyl Coumarin grafted with IBA is used for agriculture as a regulator for plant growth regulator, it can control release of IBA. In laboratory scale 7-hydroxy-4-chloromethyl Coumarin grafted with IBA was separated by chromatography. The reaction process needs to be scaled-up from 250 mL round bottom flask to 2 L and 10 L stirred-tank reactor. In 250 mL scale, the effects of reaction parameters on the grafting yield was investigated. these parameters included temperature of reaction (50 - 60 oC), time of reaction (15 min - 5 hrs.) and crystallization time (1 - 4 days). The results showed that the product yield decreased when the temperature exceeds 60 oC. The optimum condition to give the highest yield at 74 % was 55 oC for 1hr. and separated by crystallization at 23 oC for 4 days. The optimum impeller speed in 2 L reactor was 700 rpm. The constant suspension of solid was successfully used as scale up factor in 10 L reactor.