阅读说明：本技术 一种高品质白糖生产的糖汁高效清净方法 (Efficient sugar juice cleaning method for high-quality white sugar production ) 是由 高俊永 黄俊生 张平军 孙潇 徐日益 莫柳珍 黄廷冠 彭长生 黄向阳 许广球 谢 于 2018-12-21 设计创作，主要内容包括：本发明属于制糖工业技术领域,公开了一种高品质白糖生产的糖汁高效清净方法,特别是用于生产低酸性絮凝物生成的高品质白糖生产的糖汁高效清净方法。糖汁首先经过预灰、加热处理,然后进行快速沉清,沉清糖汁经过再次加热后进行硫熏中和处理,硫熏中和后糖汁进行全汁过滤处理后完成糖汁的无硫清净过程。本发明方法主要采用低温强碱、糖汁全汁过滤的清净方法,充分利用糖汁中非糖分物理、化学特性,最大程度上将其团聚除去,实现糖汁清净的高效处理,设备工艺简单,方便自动化连续生产,显著提高了生产效率,所得清糖汁质量高,优于传统亚硫酸法得到的清糖汁,具有很好的应用前景。(The invention belongs to the technical field of sugar industry, and discloses a high-efficiency sugar juice cleaning method for high-quality white sugar production, in particular to a high-efficiency sugar juice cleaning method for high-quality white sugar production by producing low-acidity floccules. The sugar juice is firstly subjected to pre-liming and heating treatment, then is quickly settled, the settled sugar juice is subjected to sulfur fumigation neutralization treatment after being heated again, and the sugar juice after sulfur fumigation neutralization is subjected to full juice filtration treatment to complete the sulfur-free cleaning process of the sugar juice. The method mainly adopts a cleaning method of low-temperature strong alkali and whole sugar juice filtration, fully utilizes the physical and chemical characteristics of non-sugar in the sugar juice, removes the non-sugar to the maximum extent, realizes the high-efficiency treatment of sugar juice cleaning, has simple equipment and process, is convenient for automatic continuous production, obviously improves the production efficiency, has high quality of the obtained clean sugar juice, is superior to the clean sugar juice obtained by the traditional sulfurous acid method, and has good application prospect.)

1. A sugar juice high-efficiency cleaning method for producing high-quality white sugar comprises the following steps:

(1) sugar juice pretreatment: adding lime milk and phosphoric acid into the sugar juice, adjusting the total phosphoric acid value in the sugar juice to be within the range of 250-450 ppm, controlling the pH value of the sugar juice to be within the range of 8.5-11.5, controlling the primary heating temperature to be within the range of 25-45 ℃, then putting the sugar juice into a mixing-flocculation reactor, adding a settling agent and a flocculating agent, and carrying out full reaction; the dosage of the settling agent is 0-2% of the mass of the sugar juice, and the concentration of the flocculating agent in the sugar juice is 1-5 ppm;

(2) settling and clarifying the sugar juice: conveying the pretreated sugar juice to a settler for clarification treatment, discharging the settled sugar juice on the upper layer of the settler through a sugar juice discharge pipe and collecting the settled sugar juice to a settled sugar juice tank, discharging the mud juice through a mud juice discharge pipe and collecting the mud juice to a mud juice tank, and keeping the sugar juice in the settler within 20 min;

(3) performing sulfur fumigation neutralization on the settled sugar juice and filtering the whole juice: heating the settled sugar juice to a temperature of 45-70 ℃, performing sulfitation neutralization treatment, controlling the pH value of the sugar juice to be 6.5-8.0, feeding the obtained sulfitation neutralized sugar juice into a sulfitation neutralized sugar juice box, adding a filter aid with the mass fraction of 0-1% to the sulfitation neutralized sugar juice for full juice filtration treatment, wherein the filtered sugar juice is the clean sugar juice obtained finally, collecting the filtered sugar juice into a filtered sugar juice box, and mixing filter mud and the mud juice obtained in the step (2) to obtain mixed mud juice;

(4) and (3) mixed mud juice treatment: the mixed mud juice is subjected to juice removal treatment by a vacuum suction filter, a centrifugal machine or a filter press, sugar in the mixed mud juice is fully recovered, residual sugar in dry mud is reduced to be below 5 conversion degrees, the removed filtered juice is treated independently or circularly, and the dry mud leaves the factory.

2. The method for efficiently cleaning sugar juice produced by high-quality white sugar according to claim 1, wherein the method comprises the following steps: the total phosphoric acid value in the sugar juice in the step (1) is 250-350 ppm, the pH value of the sugar juice is finally controlled to be 10.5-11.0 through ash adding for several times, namely, ash is added to the pH value of 8.5-9.0, and then ash is added to the pH value of 10.5-11.0; the primary heating temperature is controlled to be 30-35 ℃; the settling agent is one or two compositions of diatomite and acid-washed steel slag, and the granularity is 10-1000 meshes; the flocculant is one or a composition of more than two of polyacrylamide, biological flocculant, polyglutamic acid and modified chitosan.

3. The method for efficiently cleaning sugar juice produced by high-quality white sugar according to claim 1, wherein the method comprises the following steps: in the step (2), the residence time of the sugar juice in the settler is within 15 min.

4. The method for efficiently cleaning sugar juice produced by high-quality white sugar according to claim 1, wherein the method comprises the following steps: controlling the pH value in the step (3) to be 7.2-7.5, and controlling the heating temperature of the settled sugar juice to be 45-60 ℃; the filter aid is one or a composition of more than two of diatomite, perlite, bagasse, wood powder and activated carbon, and the granularity is 10-1000 meshes.

5. The method for efficiently cleaning sugar juice produced by high-quality white sugar according to claim 1, wherein the method comprises the following steps: the whole juice filtration in the step (3) adopts membrane separation, a filter press or a vacuum suction filter, the filtration precision of the membrane separation is 0.01-10 mu m, and the filtration precision of the filter press and the vacuum suction filter is 200-1000 meshes.

6. The method for efficiently cleaning sugar juice produced by high-quality white sugar according to claim 1, wherein the method comprises the following steps: the washing water temperature of the mixed mud juice dehydration treatment process in the step (4) is less than 60 ℃.

7. The method for efficiently cleaning sugar juice produced by high-quality white sugar according to claim 1, wherein the method comprises the following steps: the separate treatment in the step (4) is to adopt a filtered juice rapid sedimentation system, a filtered juice floating treatment system or a membrane separation system for separate treatment; and (3) the circulation treatment refers to the circulation treatment of returning to the clear sugar juice box in the step (2) or the stoving neutralization sugar juice box in the step (3).

Technical Field

The invention belongs to the technical field of sugar industry, in particular to a high-efficiency sugar juice cleaning method for producing high-quality white sugar, and particularly relates to a high-efficiency sugar juice cleaning method for producing high-quality white sugar (low-acidity flocculate) for beverage.

Background

At present, the sugar industry mainly adopts three processes to produce arable land white sugar, namely a carbonic acid method, a sulfurous acid method and a raw sugar refining method. The sugar preparation process by a carbonic acid method comprises the following steps: due to the production of a large amount of basic CaCO₃The sludge is filtered, the treatment is difficult, the discharge amount is large, and the application is limited due to the pollution to the environment. A sugar preparation process by a sulfurous acid method: the problems of color reversion of sugar products after long-term storage, high content of ash and insoluble impurities, high risk of acid floc and the like exist, and the application of the sugar products in carbonated beverages, medicines and high-quality foods is influenced. The raw sugar refining has long process route and higher cost. Therefore, as sugar standards and consumer requirements for product quality continue to increase, the traditional sugar refining clarification process is greatly challenged, and a new sugar juice clarification process is urgently needed to be found to obtain finished sugar with higher quality.

The sugar industry research work in China is always exploring new clarification process research for improving the quality of sugar products.

Chinese patent 00114236.4 discloses a new process for cleaning low-temperature phosphorus floating sugar juice by pre-liming sugar juice to pH7.0, heating to 40-60 deg.C, and adding phosphoric acid and limePerforming air flotation clarification treatment on milk, a small amount of formaldehyde, microbubbles and a flocculating agent, and then adopting a conventional carbonic acid method or sulfurous acid method sugar preparation process to produce high-grade white granulated sugar, wherein the removal rate of non-sugar components such as organic acid, colloid, pigment and the like under a neutral condition is low; chinese patent (application number) 200510035131.4 discloses a process for directly producing high-quality white sugar from sugarcane, which comprises the steps of firstly adopting a low-temperature phosphorus float method, and secondly adopting one of three methods of a sulfurous acid decolorant clarification method, a carbonic acid saturated phosphorus float method and an electrolytic method to clean sugar juice, wherein the method utilizes the coagulation property of protein in a low-temperature acidic solution, but non-sugar components such as organic acid, reducing sugar decomposition products and pectin in the sugar juice do not generate precipitates under an acidic condition; chinese patent (application number) 200610048758.8 discloses a method for producing desulfurized sugar by using high-efficiency active carbon for sugar to improve a sulfurous acid method sugar-making process, which is characterized in that high-efficiency active carbon for sugar is added into clear juice obtained by clarifying treatment by a common sulfurous acid method, and the clear juice with better quality is obtained by pressure filtration and fine filtration after the functions of adsorption desulfurization and the like and is used for producing desulfurized sugar, wherein the color value, the turbidity and the SO of white granulated sugar finished products₂The indexes can be controlled to be superior to the national first-level standard range; chinese patent (application number) 200710201374.X discloses a low-temperature treatment process of sugar refinery mixed juice by sulfurous method, which adopts the rapid flotation and cleaning treatment of cane juice at lower temperature (45-65 ℃); chinese patent (application number) 201210257567.8 discloses a carbon-method sulfur-free white sugar method for resource recycling, which is characterized in that cane juice is only added with flocculant and then is settled at low temperature and high speed, and then is heated, added with phosphoric acid, flocculant, bactericide and lime milk and then is clarified by acid air flotation, and the supernatant juice is added with lime milk and is heated to 103-105 ℃, and high-temperature carbonation of alkaline sugar juice is carried out to obtain clean sugar juice so as to produce sulfur-free white sugar; chinese patent (application number) 201310082816.9 discloses a cane juice clarifying method, which comprises preparing a floating juice from part of mixed juice, sequentially performing pre-liming, primary heating, foam preparation and floating separation on the mixed juice to obtain a floating juice, mixing the rest of mixed juice with the floating juice, performing secondary heating, sulfitation neutralization, neutralization juice heating and rapid sedimentation to obtain a clear juice, and can reduce cane juice stoppageThe retention time is prolonged, the removal rate of non-sugar is improved, the pH value of clear juice is stabilized, the phenomena of 'bottom turning' and 'cane sugar conversion' of a sedimentation tank are avoided, the production cost is saved, the environmental pollution is reduced, and the product quality is improved; chinese patent 201510435534.1 discloses a two-stage phosphorus floating sulfur-free sugar production process, the quality of clear juice reaches the prior sulfurous acid method process, but the once floating temperature of the sugar juice is higher, and the dissolution of non-sugar components such as starch, colloid and the like in the sugar juice still causes the appearance of acid flocculate of white granulated sugar products.

Although the prior art has good effect, the clarification of the sugar juice or the treatment of the scum/mud juice is carried out at higher temperature, so that non-sugar components such as starch, colloid and the like in the sugar juice are dissolved out, and the application of the product quality in high-end industries is influenced by acid floc to a certain extent, so that the sugar juice high-quality cleaning method for producing the high-quality white sugar, in particular the high-quality white sugar produced by the low-acid floc, which can meet the requirement of white sugar production in farmlands in China is urgently needed to be developed in the sugar manufacturing field, the problems in the prior art are solved, and the process and the defects of the traditional carbonic acid method or sulfurous acid method are changed.

Disclosure of Invention

In order to solve the defects and shortcomings of the prior art, the invention aims to provide a high-efficiency sugar juice cleaning method for producing high-quality white sugar.

The purpose of the invention is realized by the following technical scheme:

a sugar juice high-efficiency cleaning method for producing high-quality white sugar comprises the following steps:

(1) sugar juice pretreatment: adding lime milk and phosphoric acid into the sugar juice, adjusting the total phosphoric acid value in the sugar juice to be within the range of 250-450 ppm, controlling the pH value of the sugar juice to be within the range of 8.5-11.5, controlling the primary heating temperature to be within the range of 25-45 ℃, then putting the sugar juice into a mixing-flocculation reactor, adding a settling agent and a flocculating agent, and carrying out full reaction; the dosage of the settling agent is 0-2% of the mass of the sugar juice, and the concentration of the flocculating agent in the sugar juice is 1-5 ppm;

(2) settling and clarifying the sugar juice: conveying the pretreated sugar juice to a settler for clarification treatment, discharging the settled sugar juice on the upper layer of the settler through a sugar juice discharge pipe and collecting the settled sugar juice to a settled sugar juice tank, and discharging the mud juice through a mud juice discharge pipe and collecting the mud juice to a mud juice tank; the residence time of the sugar juice in the settler is within 20 min;

(3) performing sulfur fumigation neutralization on the settled sugar juice and filtering the whole juice: heating the settled sugar juice to a temperature of 45-70 ℃, performing sulfitation neutralization treatment, controlling the pH value of the sugar juice to be 6.5-8.0, feeding the obtained sulfitation neutralized sugar juice into a sulfitation neutralized sugar juice box, adding a filter aid with the mass fraction of 0-1% to the sulfitation neutralized sugar juice for full juice filtration treatment, wherein the filtered sugar juice is the clean sugar juice obtained finally, collecting the filtered sugar juice into a filtered sugar juice box, and mixing filter mud and the mud juice obtained in the step (2) to obtain mixed mud juice;

(4) and (3) mixed mud juice treatment: the mixed mud juice is subjected to juice removal treatment by a vacuum suction filter, a centrifugal machine or a filter press, sugar in the mixed mud juice is fully recovered, residual sugar in dry mud is reduced to be below 5 conversion degrees, the removed filtered juice is treated independently or circularly, and the dry mud leaves the factory.

Preferably, the total phosphoric acid value in the sugar juice in the step (1) is 250-350 ppm; the pH value of the sugar juice is finally controlled to be 10.5-11.0 through multi-time liming, namely, the sugar juice is firstly limed to be 8.5-9.0 and then limed to be 10.5-11.0; the primary heating temperature is controlled to be 30-35 ℃; the settling agent is one or two compositions of diatomite and acid-washed steel slag, and the granularity is 10-1000 meshes; the flocculant is one or a composition of more than two of polyacrylamide, biological flocculant, polyglutamic acid and modified chitosan;

preferably, the residence time of the sugar juice in the settler in step (2) is within 15 min.

Preferably, the pH value in the step (3) is controlled to be 7.2-7.5, and the heating temperature of the settled sugar juice is controlled to be 45-60 ℃; the filter aid is preferably one or a composition of more than two of diatomite, perlite, bagasse, wood powder and activated carbon, and the granularity is 10-1000 meshes;

preferably, the whole juice filtration in the step (3) adopts membrane separation, a filter press or a vacuum suction filter, the filtration precision of the membrane separation is 0.01-10 mu m, and the filtration precision of the filter press and the vacuum suction filter is 200-1000 meshes

Preferably, the washing water temperature of the mixed mud juice dehydration treatment process in the step (4) is less than 60 ℃.

Preferably, the separate treatment in the step (4) is a separate treatment by adopting a filtered juice rapid sedimentation system, a filtered juice floating treatment system or a membrane separation system; and (3) the circulation treatment refers to the circulation treatment of returning to the clear sugar juice box in the step (2) or the stoving neutralization sugar juice box in the step (3).

The process flow chart of the high-efficiency sugar juice cleaning method for producing the high-quality white sugar is shown in figure 1.

The technical principle of the invention is as follows:

the main component of sugar cane or beet sugar juice is sucrose, which is transformed under acidic or alkaline conditions and temperature, and the sugar juice is directly squeezed or exuded with peel, etc., and the sugar juice has very complex components, mainly comprising: water, sucrose, reducing sugar, colloid (pectin, starch, polysaccharide, and the like), amino acid, organic acid, pigment, protein, inorganic salt, lipid, enzyme, and the like all have influence on the purification of sucrose, and the mutual influence relationship needs to be fully considered in the clarification process, so that the beneficial effects of the components in the sugar juice are fully exerted, and the separation, decomposition, conversion, and the like of the components are avoided, such as the isoelectric point of protein, the electric double layer property of colloid, the coagulation/coagulation properties of organic acid and inorganic salt, and the experimental research shows that: in a sucrose solution, the lower the temperature, the more stable the non-sugar content in the sugar juice, and particularly the less easily the colloidal substance is dissolved out, for example, the dissolution temperature point of starch is below 55 ℃, but the microbial contamination is easily generated under low temperature and acidic conditions, which causes adverse effects such as sugar decomposition and glucan production, while the higher the pH, the more completely the non-sugar content such as colloidal substance and protein is aggregated, but under alkaline conditions, the more easily the monosaccharide is decomposed, which causes an increased risk of the pigment substance in the sugar juice; experiments show that the pH value of the sugar juice is finally controlled to be 10.5-11.5 through ash adding for several times, and the pH value is raised to be about 11.0 after the double electric layers of the colloid react for a period of time at about 8.5, so that the colloid is more completely dehydrated and more solid in agglomeration.

Because the prior on-line monitoring and control technology level is limited, the sugar juice fast settling technology, the sugar juice high-efficiency bubble making and sugar juice agglomeration coagulation technology have certain defects, the residence time in a settler and an upper floater is longer, the residence time of the settler is about 60-90 minutes, the residence time of the upper floater is about 25-35 minutes, the bubble making and flocculation automatic control technology in the upper floating process is limited, the sugar juice is easy to return to the bottom, the cleaning efficiency of the floating clear sugar juice is lower, in addition, the comprehensive solution of alkaline filter mud is not more, the quality requirements of the sugar making products are produced according to national standard refined sugar, high-grade sugar, primary and secondary sugar, special technical development aiming at sugar used in special industries, such as white sugar using low-acid floccule in the beverage industry is not carried out, and the low-temperature and strong-base process of the sugar juice is not involved before the scheme.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) the sugar juice cleaning method adopts a cleaning method of filtering the whole sugar juice after low-temperature strong-base clarification and sulfitation neutralization, does not add any bactericide, formaldehyde and other additives, effectively removes non-sugar in the sugar juice by using the strong-base bacteriostatic action at low temperature, and the whole cleaning process is carried out at lower temperature, thereby avoiding the re-dissolution of colloid, starch, protein and the like and having good sugar juice cleaning effect;

(2) according to the sugar juice cleaning method, the settling and staying time of the sugar juice in the cleaning process is controlled to be about 20min, the filtering time of the whole sugar juice is 3-5 min, the total staying time is 25-40 min, the sugar juice staying time is short, the conversion of cane sugar is less, the removal rate of non-sugar is high, the mud juice is directly treated by a vacuum suction filter, a centrifugal machine or a belt type juice removing system, the loss of sugar is less, the sugar yield of production can be increased, and the economic benefit of an enterprise is improved;

(3) the pH value of the filter mud finally obtained in the cleaning process is 7.2-8.5, high-alkalinity filter mud pollution is avoided, and the filter mud is rich in P, K, proteins, lipids and other organic nutrients, so that the recycling deep development value is high;

(4) the cleaning effect of the sugar juice treated by the method of the invention reaches or is superior to the cleaning effect of the traditional carbonic acid method and sulfurous method: the color value is stabilized within the range of 600-1100 IU, the turbidity is within the range of 5-60 MAU, the colloid content is lower than 0.02 percent, the sugar juice quality meets the requirements of national standard top grade white granulated sugar production, and the method can be used for producing high-quality white sugar products generated by low-acidity floccules.

Drawings

FIG. 1 is a process flow chart of the method for efficiently cleaning sugar juice produced by high-quality white sugar of the invention.

Detailed Description

The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.