Method for settling extracted sugarcane juice by using weak base

Abstract

The invention aims to provide a method for settling extracted sugarcane juice by using a weak base. The method comprises the following steps of: filtering the extracted sugarcane juice, adding lime and phosphoric acid to adjust the pH value, heating for the first time, fumigating with sulphur, adding lime to neutralize, heating for the second time, settling the neutralized sugarcane juice, and separating a supernate from a puree. In the step of filtering the extracted sugarcane juice, the content of the absolute-dry sugarcane chaff in the filtered extracted sugarcane juice is controlled below 2.4g / L, and in the steps of fumigating with the sulphur and adding the lime to neutralize, the pH value of the extracted sugarcane juice is controlled at 7.8 to 9. The sucrose prepared by adopting the method has high quality, has a few impurities and is low in color value and high in yield. The scouring and recovering rate of the finally prepared sucrose can be improved by more than 2%, and the improvement is considerable to the enterprises making ten thousand tons of sucrose annually. The whole process dispenses with complex flows, and the cost is kept unchanged. The method has high practical and economic values.

Description

technical field [0001] The invention relates to the field of sugar cane sugar production, in particular to a weak alkaline clarification method for pressed sugar cane juice. Background technique [0002] Sucrose is one of the basic food additives for humans with a history of thousands of years. It is the main product of photosynthesis, widely distributed in plants, especially in sugar beet and sugarcane. Sugar with sucrose as the main component is divided into rock sugar, white granulated sugar, cotton white sugar and brown granulated sugar according to the degree of purity. Sucrose is the most abundant in beet and sugar cane. The white sugar and brown sugar that are usually used are all sucrose. [0003] There are three commonly used methods for sugar clarification process using sugarcane as raw material: [0004] Lime method: the sugarcane juice clarification method with lime as the main clarifier. The process plan is to add lime milk to the mixed juice, adjust the pH va...

AI Technical Summary

Problems solved by technology

[0008] Although in the process of sugar production by sulfite process, increasing the pH value can remove more non-sugar impurities, improve the purity of clear juice and syrup, and help improve product quality and recovery rate of cooking; but high pH value will make sugar juice Maillard reaction occurs to form new pigments, resulting in an increase in the color value of white sugar

Therefore, in order to ensure the color index of white sugar in the production of sulfitic sugar factories, the pH value of the sugar juice during sulfur fumigation and neutralization is usually controlled at a neutral level, which limits the improvement of the quality of sucrose and the recovery rate of scouring