White granulated sugar refining method

Abstract

The invention discloses a white granulated sugar refining method which comprises the steps of cane sugar juicing, pretreatment, membrane microfiltration, pre-concentration, ion exchange decoloration,desalination, evaporation concentration, crystallization, centrifugal separation, drying and the like to obtain crystallized white granulated sugar. According to the method, ceramic microfiltration isused for replacing a plate frame and lime precipitation step, so that an ultrafiltration process section is omitted; membrane concentration is adopted, so that the evaporation capacity of evaporationand concentration equipment is reduced, the energy consumption is reduced, and a part of inorganic salt is removed; an ion exchange decolorization and impurity removal process is used for replacing astoving process, so that the problem of sulfur residues in cane sugar is solved, and the product quality is improved; ion exchange desalination is adopted, so that salt in the sucrose juice is effectively removed; MVR evaporation and concentration are adopted, so that the energy consumption is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of sugar production, and in particular relates to a method for refining white granulated sugar. Background technique [0002] my country is one of the major sugar production and consumption countries in the world. There are nearly 300 domestic enterprises engaged in sugar production and processing, with an annual output of nearly 14 million tons of sugar. At present, the commonly used sucrose production processes in my country include "two-step method", sulfurous acid method, and carbonic acid method. [0003] The "two-step method" requires large investment, complicated process, and high production cost, so it is not suitable for promotion in China; the sucrose produced by the carbonic acid method is of good quality, but the process is complicated, the process is long, the investment is large, and the environmental pollution is serious. [0004] Sulfurous acid method is currently the main method of sugar pr...

AI Technical Summary

Problems solved by technology

However, this process also has many disadvantages: first, the process uses lime precipitation to remove impurities, and after plate and frame press filtration, a large amount of residue will be produced, which will seriously pollute the environment; secondly, the decolorization of this process is to use sulfur Smoked method, there will be sulfur residue in the product, which is harmful to human health. With the further improvement of the country's food safety requirements, this method will be restricted in use; third, the lime used in this method needs to be calcined. On the one hand, it consumes Larger energy is accompanied by waste discharge, and at the same time, a process section is added, which increases production costs; fourth, the concentration process of this method uses a multi-effect evaporator, which has high energy consumption and high production costs; fifth. , the process is relatively complicated, there are many equipments, and the area is large, and the control process is complicated