Clean and efficient cane juice clarification method by sulfurous acid method

Abstract

The invention relates to a clean and efficient cane juice clarification method by a sulfurous acid method. The method comprises the steps: a mixed juice is subjected to pre-liming and primary heating,then is fed into a sulfur fumigation neutralization reactor, and is subjected to sulfur fumigation neutralization reaction; a gas-liquid mixture coming out from the sulfur fumigation neutralization reactor is introduced into a gas dispersing box; tail gas from the gas dispersing box is introduced into an absorption device; a lime milk solution is introduced into the absorption device coming out from a lime milk storage tank to absorb SO2 in the tail gas; and then the lime milk solution absorbing SO2 is guided back to the lime milk storage tank, the lime milk solution is introduced into the sulfur fumigation neutralization reactor by the lime milk storage tank, and the sulfur fumigation neutralization juice from the gas dispersing box is conventionally fed into secondary heating and settling processes. According to the method, SO3<2-> and Ca<2+> can quickly and fully react to separate out CaSO3 precipitate, so that residual SO3<2-> and Ca<2+> in a clarified juice are reduced, the residual sulfur content of finished white granulated sugar is reduced, meanwhile, the SO2 absorption rate of a cane juice and the SO2 content in tail gas are increased, the sulfur consumption is reduced, and the environment is effectively protected.

Description

technical field [0001] The invention belongs to the field of clarification of sugarcane juice or sugar liquid in the process of sugar production, and in particular relates to a clean and efficient method for clarification of sugarcane juice by sulfite method. Background technique [0002] Cane juice (sugar juice) clarification is a key link in the sugar production process. The clarification effect of cane juice (sugar juice) is related to product quality, sugar recovery rate and the amount of clarifying agent, and ultimately affects the competitiveness of sugar factories. At present, the sulfurous method clarification process commonly used in sugar factories, by adding SO 2 , lime milk and phosphoric acid, forming calcium sulfite precipitation and calcium phosphate precipitation to remove the colloid and pigment in the sugar juice, so SO 2 and Ca(OH) 2 The neutralization reaction speed and reaction degree in cane juice (sugar juice) will directly affect the clarification a...

AI Technical Summary

Problems solved by technology

The sulfur fumigation neutralizer has the following major deficiencies: (1) sugarcane juice absorbs SO 2 Slow and insufficient; (2) Lime and SO 2 The reaction is not complete; (3) The particle size of calcium sulfite precipitation is not uniform, and the adsorption capacity is low

Therefore, the following problems often occur in the process of production and use: (1) The pH of sugarcane juice fluctuates greatly in the subsequent process, which affects the quality of sugar juice; (2) SO in clear juice 2 The large amount of residues will eventually lead to high sulfur content in the finished white granulated sugar, which will degrade the white granulated sugar; (3) The high residual calcium salt content in sugar juice will lead to high ash content in the product and serious fouling of equipment and pipelines; (4) Inorganic substances in sugar juice The content of CaSO is high, so that the honey making rate increases and the sugar recovery rate decreases; (5) due to CaSO 3 The particles are not firm and uniform, the adsorption and sedimentation performance is reduced, and the decolorization effect is poor; (6) Lime and SO 2 Incomplete response, SO 2 It cannot be fully absorbed and utilized, and the amount of sulfur is large; (7) due to the absorption of SO by sugarcane juice 2 Insufficient, SO in the exhaust gas discharged from the diffuser box 2 High content, directly discharged into the atmosphere will cause environmental pollution

But in this patent SO 2 The use of exhaust gas does not accelerate SO 3 2- and Ca 2+ The reaction is not very helpful to improve the clarification effect of sugarcane juice

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