年产2万吨柠檬酸厂生产工艺的设计

北京理工大学珠海学院课程论文annual output of 20000 tons citric acid factory Production processdesignAbstractIn this design,cassava is used as raw material.The dried tapioca is ground into powder,mixed with water,added with a small amount of a -amylase directly,sterilized and cooledafter liquefaction,and then inoculated for fermentation.The dry cassava contains 13%water,75%starch and about 6%protein.The protein in cassava dry material can be used asnitrogen source for thallus growth.Cassava dried raw materials contain inorganic salts of iron,magnesium,potassium,calcium,etc.Citric acid was produced by submerged aerobicfermentation of Aspergillus niger and calcium salt extraction.These two methods arecommonly used production methods in China.They have a lot of practical experience,areeasy to operate and have little risk.This design gives a clear design for the technological method,technological process andrelated technical description of citric acid production by fermentation.Due to limitedknowledge,only the material balance calculation and the calculation of fermenter selectionwere done in the process calculation.This design includes the process flow chart,workshoplayout,factory floor plan,etc.Key words:Aspergillus niger;Deep fermentation;Calcium salt extraction;Equipmentselection