With the enlargement of its use, it cannot meet the demand of industrial development to extract citral from vegetable oil only, so synthesizing methods of citral come forth continuously.

• 随着柠檬醛用途的扩大,从植物油中提取的柠檬醛已无法满足工业发展的需要,因此人工合成柠檬酸的方法不断涌现。