Method for producing plant dyes by efficient solid-state fermentation of Polygonum indigo leaves

Abstract

A method for producing plant dye by high efficiency solid state fermentation of leaves of polygonum tinctorium includes the following steps: placing the leaves of polygonum tinctorium with separationof stalk and leaves into a microwave green color removing machine for removing green color; naturally drying the leaves of polygonum tinctorium, and uniformly spraying a fermentation accelerant on thesurface of the leaves of polygonum tinctorium; placing the leaves of polygonum tinctorium in a pulse solid state fermentation reactor, first subjecting to anaerobic fermentation, and opening pressurepulse and injecting damp air when the temperature is naturally raised to 40-60 DEG C, wherein the air humidity is 65%-90%, a pulse peak value is 0.2-0.3 MPa, a pulse valley value is 0.05-0.15 Mpa, apulse period is 30-120 minutes, and performing fermentation until the temperature is not raised by itself; and then drying the leaves by a microwave dryer. According to the method, the green color isquickly removed by the microwave, and the leaves of polygonum tinctorium after microwave green color removing can be naturally dried without requirement for climate and sites. At the same time, the fermentation accelerant is sprayed on the leaves of polygonum tinctorium before fermentation, and so, the fermentation period can be shortened, the pigment content is improved; and the pulse solid statefermentation reactor is cooperatively utilized, and therefore, the fermentation time can be greatly shortened, and the fermentation quality can be controlled. In a whole production process, no wateris discharge, and the method is environmentally friendly.

Description

technical field [0001] The invention relates to the fields of natural plant extraction and microbial fermentation, in particular to a method for producing plant dyes by high-efficiency solid-state fermentation of Polygonum indigo leaves. Background technique [0002] The production of chemical dyes is a highly polluting industry, which involves the pollution of the entire industrial chain. Chemical dyes come from petroleum, and petroleum refining products pollute the environment very seriously in the production of chemical dye intermediates such as H acid. Developed countries no longer produce chemical dye intermediates. At the same time, the process of synthesizing chemical dyes from chemical dye intermediates is also highly polluting. , High carbon emissions. Plant dyes come from planting, and photosynthesis can only be carried out by absorbing carbon dioxide during the planting process. This is the opposite process of emitting carbon dioxide from chemical dye production,...

AI Technical Summary

Problems solved by technology

At the same time, a large area of ​​drying place is required, and manual care is required.

Moreover, the temperature and humidity of the fermentation process are also difficult to control, and the quality of the dry fermentation method is difficult to guarantee. The dry fermentation method is gradually eliminated in China