Sulfur-free and efficient cleaning method for sugar juice

Abstract

The invention belongs to the technical field of sugar industries and discloses a sugar juice sulfur-free efficient cleaning method. After preliming, heating, foaming and flocculant adding are conducted on sugar juice, one-time floating clarification is conducted, large-particle non-sugar components in the sugar juice are removed; after secondary preliming, heating, foaming and flocculant adding are conducted on the one-time floating clarification sugar juice, secondary floating clarification is conducted; the sulfur-free cleaning process of the sugar juice is completed on the sugar juice obtained through secondary floating clarification through a sugar juice filtering and separating system. According to the sugar juice sulfur-free efficient cleaning method, the cleaning method of two levels of floating of the sugar juice is mainly adopted, and clean and complete sufur-free and carbonic-acid-free processing is achieved on the sugar juice, the equipment technology is simple, automatic continuous production is convenient, and the production efficiency is obviously improved. The obtained clean sugar juice is high in quality and is superior to clean sugar juice obtained through a traditional sulfurous method, and a very good application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of sugar industry, and in particular relates to a sulfur-free and efficient cleaning method for sugar juice. Background technique [0002] At present, the sugar industry adopts two processes to produce cultivated white sugar, that is, the carbonation method and the sulfurous acid method cleaning technology. Carbonation sugar production process: Due to the production of a large amount of alkaline (8.0<pH<11) solid waste-filter mud (the ratio of wet filter mud to raw materials is about 5-10%), it is difficult to handle and the discharge is large, causing environmental damage pollution, which limits its application. Sulfurous acid sugar production process: due to the unstable reductive bleaching effect of sulfurous acid on pigments, the sugar will return to color after long storage, the content of ash and insoluble impurities is high, and the sulfur content of the product is above 20mg / kg (the national s...

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Problems solved by technology

[0009] Chinese Patent (Application No.) 201410088309.0 discloses a sulfur-free clarification method for sugar cane sugar production. The lime method is used for primary precipitation clarification and tannin and calcium bicarbonate reaction for secondary precipitation purification to obtain sulfur-free clear sugar juice. Two steps The temperature of the clarification process is in the boiling state of the sugar juice, and the sedimentation process is carried out by the difference in solid-liquid specific gravity in the solution, which is greatly affected by the structure of the sedimentation tank, fluid flow state, particle size, temperature and other factors. The time is 30-45min, the settling time of the multi-layer settler is 60-75min, the two-stage settling process, the total residence time of the sugar juice in the settler is longer (the total residence time is 60-150min), the sucrose content is converted more, and the mud juice in this method is returned to the mixed juice tank, which further increases the sugar loss and production energy consumption

The more advanced cleaning methods of sugar liquid include membrane separation method and ion exchange method. Membrane separation method has many problems of membrane material and membrane attenuation, so far it has not been applied in sugar factories with low product added value. There are many applications and promotions in factories, and advanced ion exchange equipment has also been introduced in China, but there are problems such as high material quality requirements and complicated operations, and domestic sugar refineries have not been able to promote them.

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