Method for Purifying Organic Acids
A technology of organic acids and procedures, applied in the field of purification of organic acids, can solve problems such as energy consumption
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Embodiment 1
[0061] condition test
[0062] A. Sedimentation test of inorganic salt flocculant
[0063] In this test, the itaconic acid fermentation broth was subjected to a sedimentation test with various inorganic flocculants.
[0064] Since the composition of itaconic acid fermentation broth is quite complex, there are not only a variety of small molecule salts and organic acids, but also many solid impurities that can cause membrane blockage, so if only the microfiltration process is used for preliminary separation, the microfiltration membrane is easy Severe fouling will cause serious attenuation of filtration rate and decrease the service life of the membrane. Therefore, when purifying itaconic acid from fermentation broth, pretreatment is required to reduce solid impurities. In this test, four common inorganic salts CaCl 2 , AlCl 3 with FeCl 3 as a flocculant.
[0065] After the fermentation broth was adjusted to an appropriate pH value, 1 ml of flocculant solution of approp...
Embodiment 2
[0110] Purification of itaconic acid from itaconic acid fermentation broth
[0111] A.Process overview
[0112] The flow chart of itaconic acid purification is as follows: figure 2 shown. see figure 2 . 1 liter of fermented broth with an original pH value of about 6-7, using 6M H 2 SO 4 Adjust its pH value to 3 (step 201). Then add 2M FeCl 3 The solution is pre-treated (step 203) and stirred evenly at room temperature. After standing for several hours, it is centrifuged to obtain the supernatant (step 205). Aqueous solution of itaconic acid reduces the loss of itaconic acid. Then, the itaconic acid solution continues to be ultra-filtered to remove small molecular solid impurities (step 209). The pH value of the filtrate is adjusted to be less than 5.2 (step 211) and then purified and concentrated by thin film extraction (step 213). Afterwards, concentrate the purified itaconic acid solution (optional), and then adjust the pH value of the solution (step 215), then d...
Embodiment 3
[0159] Recovery of Succinic Acid in Membrane System
[0160] The combination of kerosene / D2EHPA / Aliquat336 was used as the extractant, and the mixed solution of 2M NaOH and 5M NaCl was used as the back-extraction phase to carry out thin film extraction on the feedstock containing 58.7g / L succinic acid fermentation broth. The results are shown in Table 14.
[0161] Table 14: Thin film extraction of succinic acid
[0162]
[0163] The results showed that 90.4% of succinic acid could be recovered by thin film extraction. Also, the recovery benefits of itaconic acid and succinic acid in thin film extraction are as follows: Figure 4 shown. Depend on Figure 4 It can be seen that in the thin film extraction process, if the appropriate conditions are matched, more than 90% of the target organic acid can be recovered within four hours of operation.
[0164] Also, the succinic acid fermentation broth was purified in the same purification procedure as shown in Example 2. in ac...
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