Method for reusing calcium citrate sugar washing water in citric acid production
A calcium citrate and sugar washing technology, which is applied in carboxylate preparation, organic chemistry, etc., can solve the problems of difficult operation, time-consuming, high labor intensity, etc., and achieve the goals of prolonging the settling time, increasing the yield, and ensuring stable operation Effect
Active Publication Date: 2013-10-23
程洪光
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Problems solved by technology
In the process of calcium citrate suction filtration and sugar washing, a large number of calcium citrate particles permeate through the filter belt (filter cloth) and are drawn into concentrated sugar water and sugar washing water. After the sugar water and sugar washing water are mixed, cooled by heat exchange and settled, they are sent to the environmental protection workshop as waste water for treatment. Although part of the calcium citrate particles can be recovered by settling, the operation is difficult, labor-intensive, and time-consuming.
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[0013] The production of citric acid is that citric acid bacteria are inserted into the seed culture tank for fermentation and culture, and then transferred to the fermentation tank for fermentation. After the fermentation reaches the end, it is put into the fermentation liquid heating tank, and after heating, it is pumped into the filter press to obtain the press filter liquid, such as figure 1 As shown, the press-filtered liquid is input into the neutralization reactor and heated, and the calcium carbonate slurry (or calcium hydroxide slurry) is slowly added to the neutralization reaction while stirring. Carry out suction filtration to remove concentrated sugar water, then add hot water successively for washing and then suction filtration to clean the fermentation residual sugar, and suction and filter out sugar washing water.
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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 [0001] The invention relates to the field of citric acid production, in particular to a method for reusing sugar water washed with calcium citrate in citric acid production. Background technique [0002] The production of citric acid is that citric acid bacteria are inserted into the seed culture tank for fermentation and culture, and then transferred to the fermentation tank for fermentation. After the fermentation reaches the end, it is put into the fermentation liquid heating tank, and after heating, it is pumped into the filter press to obtain the press filter liquid, and the press After the filtrate is input into the neutralization reactor and heated, slowly add calcium carbonate slurry (or calcium hydroxide slurry) to carry out neutralization reaction while stirring, and extract the calcium citrate generated by the reaction together with the feed liquid (i.e. concentrated sugar water) Filtrate, extract the concentrated sugar water, add hot water success...
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IPC IPC(8): C07C59/265C07C51/41
Inventor 程洪光
Owner 程洪光