柠檬酸生产线交钥匙工程

流程描述

（1）破碎
去除杂质并计量后的清洁玉米被送到锤磨机粉碎。然后，它被发送到旋转振动筛。之后，它被送到水箱进行储存。玉米粉尺寸：60目筛底溢为≤30%。

（2） 调整
加水调节面粉浆，DS=28-32%。计量后的面粉浆通过NaON溶液和酶添加被送到PH调节罐中。

（3）液化
合格的玉米粉浆被送到第一个喷射炊具和保留罐以获得葡萄糖。然后将其发送到添加酶的第二个喷射炊具和保留罐。之后，将其发送到液化柱进行液化以获得所需的DE值。

（4） 过滤
液化后，取压滤机过滤粗蛋白。滤液被送到下一部分。而滤饼干燥后，就会得到粗蛋白。

（5）种子生产
液化后，将葡萄糖送入种子罐调节DS值和PH，灭菌冷却，然后进行细菌生长。发酵菌株耐高温，产量高。

（6）发酵
液化后，将葡萄糖送入发酵罐调节DS值和PH，灭菌冷却至35ºC。 通过灭菌管道将种子添加到发酵罐中，以无菌空气连续进料进行发酵。当残余葡萄糖低于1g/L时，发酵完成。

（7） 预过滤
除了柠檬酸产品外，还有一些杂质，如菌丝体。过滤杂质是确保柠檬酸质量的第一。洗涤后的菌丝体出售给饲料生产。滤液为稀柠檬酸，用于第一次中和。

（8） 二次过滤
预过滤后，仍有一些杂质。第二次过滤用于再次去除杂质，以确保滤液清澈透明。洗涤滤饼后，滤液为稀柠檬酸进行第二次中和。

（9） 第一次中和
将CaCO3加入稀柠檬酸中，得到Ca3（C6H5O7）2•4H2O作为沉淀物。它由真空过滤器过滤。滤液作为废水进入ETP。

(10) 2nd neutralization
The sediment of Ca3(C6H5O7)2•4H2O is adjusted, then reaction with the filtrate after 2nd filtration to get CaH(C6H5O7) •3H2O as the sediment, which is filtered by the vacuum filter. The filtrate is used for the 1st neutralization. The CaH(C6H5O7) •3H2O after adjusting is sent to the next section.

(11) Acidehydrate
The CaH(C6H5O7) •3H2O after adjusting is made reaction with H2SO4 to get citric acid (C6H8O7) and CaSO4. The CaSO4 is filtered out by the belt vacuum filter to get the CaSO4 crystalline for selling to the gypsum production. And the citric acid is sent to the next section.

(12) Decoloring and filtration
Adding active carbon to the citric acid with agitating for the decoloring. Then to the next refinery section.

(13) Ion exchange
The filtration of above section is sent to ion exchangers for removing cation and anion as well as bad odor and soluble impurities to get refined citric acid.

(14) Monohydrate citric acid evaporation
After filtering by the check filter, the citric acid is sent to the evaporator to get high DS value of product.

(15) Monohydrate citric acid crystallization
The qualified CAM after evaporation is sent to the crystallization section for the crystallization. After keeping crystal at proper time, the crystal will be got, and then it is sent to the refinery section.

(16) Anhydrous citric acid crystallization
The CAA after evaporation is sent to the forced circulation evaporating crystallizer to get the crystal.

(17) Separation
After crystallization, both crystallized CAM and CAA are sent to the separator to separate the mother liquid, then get the qualified wet products to next section. 

(18) Drying & sieving
The wet product is sent to dryer to get the dried product, then sent to the vibration sieve to get the qualified product.