A process for refining sucrose

Abstract

The invention discloses a process for refining sucrose. The specific steps include sucrose juice extraction, pretreatment, membrane microfiltration, preconcentration, ion exchange decolorization, desalination, MVR (mechanical vapor recompression technology) evaporation concentration, crystallization, and centrifugal separation. , drying and other steps to obtain sucrose crystals. The advantages of the present invention are: replace the plate frame and lime precipitation steps with ceramic microfiltration, save the ultrafiltration process section; use membrane concentration to reduce the evaporation of evaporation concentration equipment, reduce energy consumption, and remove a part of inorganic salts; The ion exchange decolorization and impurity removal process replaces the sulfur fumigation process, which solves the problem of sulfur residue in sucrose and improves product quality; uses ion exchange desalination to effectively remove the salt in sucrose juice; uses MVR evaporation and concentration to effectively reduce Energy consumption; the use of membrane concentration, separation and ion exchange equipment reduces the footprint of the equipment and reduces infrastructure investment.

Description

technical field [0001] The invention relates to a sucrose refining process, in particular to a refining process. Background technique [0002] The so-called "one-step method" usually refers to the on-site processing of sugar materials (sugar cane, sugar beet) in the field sugar factory in the sugar production area to directly produce finished sugar, that is, "farmland sugar"; including: cultivated land white granulated sugar, cultivated land Brown sugar, cultivated brown sugar, etc. The sugar produced by the "one-step method" can be roughly divided into carbonation (clean process) sugar, sulfite process (clean process) sugar, lime process (clean process) sugar, etc. due to different processing and cleaning processes. [0003] All beet sugar factories in the world adopt the "one-step process" and adopt the carbonation method to clean the sugar beet land; with the improvement of beet quality and process technology, the quality of sugar beet land has reached the top grade, and...

AI Technical Summary

Problems solved by technology

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; The sulfuric acid method is currently the main sugar production method in China because of its relatively mature technology and relatively small investment.

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

This method has the following disadvantages: first, the plate and frame filter press is used, which is relatively traditional, low in automation, and labor-intensive equipment. The working environment of the equipment is harsh and the production efficiency is low; For ultrafiltration membranes, there is no microfiltration membrane pretreatment in front, and the sugar liquid contains more macromolecular substances such as colloids and starches, which will cause low membrane flux, easy clogging of membrane pores, difficult cleaning, and poor practical operability; and The temperature of this part of the process is above 40°C. The organic membrane is not resistant to high temperature, and the life of the membrane will be relatively short, which is uneconomical and reasonable. The ash content is high, the quality is low or unqualified; fourth, the traditional three-effect evaporator is used, which wastes a lot of energy. Compared with advanced technologies such as MVR, the energy consumption is higher

Fifth, the relevant process parameters have not been optimized, resulting in waste of energy

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