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中和、水化脱胶和碱炼脱酸工程

中和:毛油从毛油罐用供油泵输出,经计量后进入毛油换热器回收部分热量,再通过加热器加热到工艺要求温度,与来自磷酸罐的经过计量的磷酸或柠檬酸在混合气(M401)中混合后进入调质罐调质(R401),使油中的非水化磷脂转化为水化磷脂;然后加碱中和,加碱量和碱液的浓度视毛油的质量。中和后的油经过加热器加热到分离温度(90℃)进入离心分离机分离以除去原油中的磷脂、FFA和其他杂质。
该分离机配置瑞典Alfa-laval的PX80型分离机,生产能力300t/d,分离的皂角可生产酸化油或外售,油则进入水洗工序。
水洗:从中和分离机出来的中和油仍然含有大约500ppm左右的皂,为了除去这些残存的皂,在油中加入5-8%左右的热水,通常热水的温度较油温3-5℃。为了使水洗效果更稳定,在水洗时加入磷酸或柠檬酸,油和水在混合器重混合后通过加热器加热到90-95℃进入水洗分离机分离出残皂和绝大部分的水,含有皂、油的水进入油水分离箱,捕集其中的油之后再经室外捕油池进步捕集,废水排到污水处理站。
真空干燥阶段:从水洗分离机出来的水洗油仍含有少量不利于油品稳定的水,为了除去这些水分,90℃的油被送到真空干燥器内进行真空脱水。脱水后的油进到脱色工序。干燥油抽出泵选用屏蔽泵。
Hydration Deguming & Alkali Refining Deacidification Process
Neutralization: the crude oil is output by the oil feed pump from the oil tank, and next enters the crude oil heat exchanger to recover part of heat after metering and then is heated to the required temperature by the heater. After that, the oil is mixed with the metered phosphoric acid or citric acid from phosphate tank in the gas mixture (M401), and then enters the conditioning tank (R401) to make the non-hydratable phospholipids in oil change into the hydratable phospholipids. Add the alkali for neutralization, and the alkali quantity and alkali solution concentration depend on the quality of the crude oil. Through the heater, the neutralized oil is heated to the temperature (90℃) suitable for centrifugal separation to remove the phospholipids, FFA and other impurities in the crude oil.
For the separation, the Sweden Alfa-laval PX80 separator is used, with the production capacity 300t/d. The separated gleditsia sinensis lam can produce acidic oil or be sold, and the oil is goes to the washing process.
 
Washing: there is still about 500ppm soap in the neutralized oil from the separator. To remove the remaining soap, add into the oil about 5~8% hot water, with water temperature 3~5 ℃ higher than the oil generally. To achieve more stable washing effect, add phosphoric acid or citric acid when washing. The re-mixed oil and water in the mixer is heated to 90-95℃ by the heater, and then enters the wash separator to separate the remaining soap and most water. The water with soap and oil enters into oil separator to separate out oil in the water. Further catch the oil outside, and the waste water is discharged to the sewage treatment station.
 
Vacuum drying stage: there is still moisture in the oil from the wash separator, and the moisture will affect the stability of the oil. So the oil at 90℃ should be sent to vacuum drier to remove the moisture, and then the dehydrated oil goes to the decoloring process. Finally, pump out the dry oil by canned pump.
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