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Practice of noval counter-current bleaching process in soybean oil refining
  
DOI：10.12166/j.zgyz.1003-7969/2020.07.007
KeyWord:soybean oil refining  pulse filter  leaf filter  decolorant  counter-current bleaching
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ZENG Hongwei Sinograin Oils(Tianjin)Co.,Ltd.,Tianjin 300461,China； 
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Abstract:
      Oil bleaching unit is an important process in refinery plant. Continuous counter-current bleaching process used in soybean oil refining was introduced, and two bleaching tanks and two filters (pulse filter and leaf filter)were used in the process.The spent decolorant was filtered in pulse filter, then added to the neutralized oil in the form of filter slurry for pre-bleaching, and then filtered in the leaf filter and discharged as waste decolorant.The pre-bleaching stage mainly removed soaps and phosphatides. The fresh decolorant was mixed with pre-bleached oil in the second bleaching stage, which mainly removed the pigments. The practice showed that compared with traditional bleaching process, counter-current bleaching could save 30% of decolorant, improve the oil yield, reduce pollutant emissions, save production costs, and achieve good economic benefits.
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