CN103360239B - Method for reusing calcium citrate sugar washing water in citric acid production - Google Patents
Method for reusing calcium citrate sugar washing water in citric acid production Download PDFInfo
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- CN103360239B CN103360239B CN201310288131.XA CN201310288131A CN103360239B CN 103360239 B CN103360239 B CN 103360239B CN 201310288131 A CN201310288131 A CN 201310288131A CN 103360239 B CN103360239 B CN 103360239B
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Abstract
The invention discloses a method for reusing calcium citrate sugar washing water in citric acid production, which comprises the following steps of: performing suction filtration of the calcium citrate generated by a neutralizing reaction between fermentation clear liquid and calcium slurry to remove thick sugar water, and adding hot water for washing; after washing, performing suction filtration again to obtain calcium citrate sugar washing water; after heat exchange cooling, directly conveying the sugar washing water as a water source to a mixing tank to prepare calcium slurry; and pumping the prepared calcium slurry into a neutralizing reaction kettle. The method disclosed by the invention has the beneficial effects that (I) over 70% of the lost calcium citrate can be recovered; (II) the wastewater treatment pressure of an enterprise is eased; (III) the stable operation of the neutralizing reaction is guaranteed, and under the effect of the waste heat of the sugar washing water, the temperature of the prepared calcium carbonate slurry (or calcium hydroxide slurry) is much higher than that of the slurry prepared by use of normal-temperature water and can reach or approach the temperature required by the neutralizing reaction; and (IV) the water consumption in production is reduced, and since the sugar washing water adopted for preparing the calcium carbonate slurry (or calcium hydroxide slurry) is reusable water, the use of new water is saved.
Description
Technical field
The present invention relates to citric acid production field, specifically, relate to a kind of washing sugar with calcium cirtrate Water reuse method in citric acid production.
Background technology
Citric acid production accesses seed culture tank fermentation culture by citric acid bacterial classification, then ferment tank is proceeded to, treat that fermented liquid heating tank is put in fermentation to terminal, pump into pressure filter after heating and obtain press filtration clear liquid, after press filtration clear liquid input neutralization reaction still also heating, in stirring, slowly add calcium carbonate slurry (or calcium hydroxide slurry) carry out neutralization reaction, the citrate of lime that reaction generates is carried out suction filtration together with feed liquid (i.e. dense syrup), extract dense syrup, and successively add hot wash and suction filtration again, clean fermentation residual sugar, suction filtration goes out affination water.In the process of citrate of lime suction filtration and affination, there is a large amount of calcium citrate microparticles through strainer (filter cloth), be drawn in dense syrup and affination water, existing treatment process mixes the dense syrup that suction filtration obtains after heat exchange cooling and sedimentation with affination water, together transport between environment-friendly vehicle as waste water and process, although a part of calcium citrate microparticles can be reclaimed by the method for sedimentation, operation easier is large, labour intensity is high, expend man-hour.Citrate of lime qualified for affination is inserted acidolysis reaction still, pumps into and apply mechanically rare citric acid solution or water, in stirring, add the vitriol oil after heating carry out acidolysis reaction, then obtain citric acid solution through suction filtration and washing.
Summary of the invention
The invention provides a kind of washing sugar with calcium cirtrate Water reuse method in citric acid production, its objective is the citrate of lime reclaiming and run off, alleviate wastewater treatment pressure, save water of productive use.
The object of the invention is to be achieved by the following technical programs, washing sugar with calcium cirtrate Water reuse method in citric acid production, it is characterized in that, fermentation clear liquid and calcium are starched after citrate of lime suction filtration that neutralization reaction generates extracts dense syrup and add hot wash, after washing, suction filtration obtains washing sugar with calcium cirtrate water and is directly delivered to surge tank for allocating calcium slurry as water source again, and deployed calcium stock pump enters neutralization reaction still.
The further technical scheme of the present invention is, the washing sugar with calcium cirtrate water that suction filtration obtains is after heat exchange cooling, and be directly delivered to surge tank for allocating calcium slurry as water source, deployed calcium stock pump enters neutralization reaction still.
The present invention starches after neutralization reaction completes in fermentation clear liquid and calcium, the affination moisture flow of the dense syrup that suction filtration obtains and citrate of lime, affination water cancels settling process, after heat exchange cooling, directly transport to calcium carbonate (or calcium hydroxide) surge tank, as water source for allocating calcium carbonate slurry (or calcium hydroxide slurry), then pump into neutralization reaction still and use for neutralization reaction, dense syrup is then transported between environment-friendly vehicle and is processed after heat exchange cooling and sedimentation.
The present invention mainly contains following feature:
One is the citrate of lime of recyclable loss more than 70%, the calcium citrate microparticles be lost in affination water is back to calcium carbonate (or calcium hydroxide) slurries surge tank with affination water, allocate with the powder lime carbonate added (or calcium hydroxide), the slurries of acquisition are made to reenter neutralization reaction still, therefore calcium citrate microparticles in affination water is able to whole recovery, and then improves citric acid yield.
Two is alleviate scale wastewater treatment pressure, because washing sugar with calcium cirtrate water is for allocating calcium carbonate slurry (or calcium hydroxide slurry), thus make the waste water total amount transported between environment-friendly vehicle reduce about 50%, simultaneously because waste water total amount significantly reduces, impel dense syrup flow velocity in subsider to reduce, the settling time extends, and citrate of lime sedimentation ratio wherein improves, the recovery ratio obtained improves, and reduces the number of dropouts of citrate of lime.
Three is the steady running ensureing neutralization reaction, due to the waste heat effect of affination water, its calcium carbonate slurry (or calcium hydroxide slurry) allocated is greatly improved compared to the slurry temperature allocated by normal-temperature water, can to reach or close to the temperature required by neutralization reaction, thus avoid and bring temperature fluctuation to neutralization reaction, the citrate of lime carrying out smoothly and produce being very beneficial for neutralization reaction precipitates rapidly.If do not need utilize waste heat and cancel heat exchange temperature-fall period, then can avoid the interchanger frequent jams therefore caused, save the man-hour of unpicking and washing interchanger and expending.
Four is reduce water of productive use amount, and the affination water adopted because of allotment calcium carbonate slurry (or calcium hydroxide slurry) is water re-using, thus saves the amount of taking of new water.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the embodiment of the present invention.
Embodiment
Citric acid production accesses seed culture tank fermentation culture by citric acid bacterial classification, then ferment tank is proceeded to, treat that fermented liquid heating tank is put in fermentation to terminal, pump into pressure filter after heating and obtain press filtration clear liquid, as shown in Figure 1, by press filtration clear liquid input neutralization reaction still post-heating, in stirring, slowly add calcium carbonate slurry (or calcium hydroxide slurry) carry out neutralization reaction, the citrate of lime that reaction generates carries out suction filtration together with feed liquid (i.e. dense syrup), extract dense syrup, then successively add hot wash and suction filtration again, clean fermentation residual sugar, suction filtration goes out affination water.
In the process of the dense syrup of citrate of lime suction filtration and hot water affination suction filtration affination water, there is a large amount of calcium citrate microparticles through strainer (filter cloth), be drawn in dense syrup and affination water, innovative point of the present invention be suction filtration is obtained with the affination moisture flow of citrate of lime, transport between environment-friendly vehicle after dense syrup heat exchange cooling and sedimentation and process, affination water is after heat exchange cooling, directly be delivered to surge tank for allocating calcium slurry as water source, deployed calcium slurry pumps into neutralization reaction still and fermentation clear liquid neutralization reaction again.Acidolysis reaction still inserted by the citrate of lime that affination is qualified, pumps into and applies mechanically rare citric acid solution or water, adds the vitriol oil and carry out acidolysis reaction after heating in stirring, then obtains citric acid solution through suction filtration and washing.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention; Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent replacement, equivalence change and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (2)
1. washing sugar with calcium cirtrate Water reuse method in citric acid production, it is characterized in that, fermentation clear liquid and calcium are starched after citrate of lime suction filtration that neutralization reaction generates extracts dense syrup and add hot wash, after washing again suction filtration obtain containing part citric acid calcium particulate through washing sugar with calcium cirtrate water as water source be directly delivered to surge tank for allocate calcium slurry, calcium citrate microparticles after making suction filtration in affination water re-uses, and deployed calcium stock pump enters neutralization reaction still.
2. washing sugar with calcium cirtrate Water reuse method in citric acid production according to claim 1, it is characterized in that, the washing sugar with calcium cirtrate water that suction filtration obtains is after heat exchange cooling, and be directly delivered to surge tank for allocating calcium slurry as water source, deployed calcium stock pump enters neutralization reaction still.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310288131.XA CN103360239B (en) | 2013-07-10 | 2013-07-10 | Method for reusing calcium citrate sugar washing water in citric acid production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310288131.XA CN103360239B (en) | 2013-07-10 | 2013-07-10 | Method for reusing calcium citrate sugar washing water in citric acid production |
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| Publication Number | Publication Date |
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| CN103360239A CN103360239A (en) | 2013-10-23 |
| CN103360239B true CN103360239B (en) | 2015-04-29 |
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Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101643292A (en) * | 2008-08-04 | 2010-02-10 | 唐晓明 | Method for treating waste water from citric acid-production |
| CN201932960U (en) * | 2010-11-24 | 2011-08-17 | 潍坊英轩实业有限公司 | Washing water utilizing device for lemon acid sugar washing procedure |
| CN103058853B (en) * | 2012-12-17 | 2015-10-14 | 日照金禾博源生化有限公司 | A kind of production method of calcium hydrogen citrate |
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