Method for preparing herbicide from Jatropha curcas plant residues

Abstract

The invention provides a method for preparing a herbicide from Jatropha curcas plant residues, and belongs to the technical field of herbicides. The method comprises the following steps: taking 0.3-1kg of Jatropha curcas leaf fragments, 0.3-1 kg of Jatropha curcas branch fine wood chips and 0.3-2 kg of Jatropha curcas shell fragments, dispersing the taken materials in 15-30 L of an acetic acid solution, and carrying out ultrasonic treatment while stirring at the room temperature; carrying out natural filtering or vacuum filtration to remove residues in order to obtain a yellow water phase; repeating above the above steps for 3-5 times, mixing the yellow water phases obtained each time to obtain a water phase extract, and mixing residues obtained each time; adding the filtered residues to10-20 L of a low-boiling-point organic solvent, and carrying out reflux continuous extraction to obtain an organic phase extract; and mixing the water-phase extract with the organic-phase extract according to a volume ratio of (2-4):1, carrying out reduced pressure distillation, and recovering the organic solvent and water to obtain a brown viscous extract that is the herbicide.

Description

technical field [0001] The invention belongs to the technical field of herbicides, and in particular relates to a method for preparing herbicides by using jatropha plant residues. Background technique [0002] Jatropha curcas L. is a Euphorbiaceae shrub native to tropical America. Studies have shown that the oil content of the fruit of this tree species can be as high as 60%. In terms of medicinal value, the leaves of Jatropha curcas can be used as medicine to treat bruises, fractures, eczema and digestive tract inflammation. Generally speaking, Jatropha has important economic value, and it has been planted on a large scale in Panxi and Yunnan in my country. Relying on Jatropha plantation industry to produce biodiesel with higher added value and produce Chinese herbal decoction pieces has become one of the effective ways for local farmers to get rid of poverty and become rich. [0003] Modern research shows that the active ingredients contained in Jatropha are relatively c...

AI Technical Summary

Problems solved by technology

[0004] On the other hand, in the process of agricultural production, the growth of weeds competes with crops for nutrients, spreads diseases and insect pests, and reduces agricultural production efficiency. However, the extensive use of chemical herbicides also leads to environmental pollution and the emergence of drug-resistant weeds. Low-toxic and cheap bio-pesticides are the inevitable trend of today's agricultural production

At present, there are few reports on the development of herbicides from Jatropha jatropha extracts. This patent utilizes the biological toxicity of toxic proteins and alkaloids contained in it to prepare environmentally friendly and efficient biological herbicides