The loan is repayable over30years and will be used to build an irrigation and drainage system in a5000hectare cotton plantation in the province of kwanza sul a government spokesperson said.
The synthesis methods of nipagin esters catalyzed by sulfuric acid, p- toluene sulfonic acid, ferric sul-fate hydrate, ferric chloride hexahydrate, aluminium chloride hexahydrate, rare earth compound, solid super acid and heteropoly acid were reviewed.
