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ID:33485410
大小:1.49 MB
页数:66页
时间:2019-02-26
《异丙醇油脂浸出工艺の研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、^‘’‘_,摘要本论文对用异丙醇代替正己烷浸出—.k豆—'att,垄竺垫和檀塑遗.的工艺及能量回收进行了研究。目的是在保证安全、低消耗情况下用异丙醇浸出高品质的油脂和粕。通过实验,对比了异丙醇和正己烷浸出的油脂和粕的质量。饵NtgNig的大豆油脂含磷脂o.1%,游离脂肪酸o.09%,豆粕的蟹白质分散指数为6I;正己烷浸出的大豆油脂含磷脂2.2%,游离脂肪酸O.7%,豆粕的蛋白质分散指数为14。异丙醇浸出的棉籽油不含游离棉酚和黄曲霉毒素,棉籽饼粕中游离棉酚残斟O.013%,黄曲霉毒素残斟O.0002%。异丙醇浸出的花生油含游离脂肪酸o.45%,花生粕含油3.4%,蛋白质43.1%,狄
2、分6.5%。广—>一异丙醇浸出的油脂和粕的质量比iT.己烷好。㈣用与证己烷棚同的浸出条件,则溶剂比高达25:l:同时蒸发回收异丙阵所需的能量消耗是正己烷的5倍。为了降低溶剂比和回收异丙醇的能鞋消耗,引进了膨化预处理,冷却分离混合油,循环分离后fj勺溉俞油上相液和膜过滤。浸出溶剂比达到l:I。厂丫一在可接受的费用范围内膜过滤使异丙醇达到93%以』:的纯度。藩发l蝇的87.7%异丙醇需能量865.2kj,冷却分离仪需4326ki,这是蒸发能量的5%。冷却分离,然后.目=】硅橡胶膜进行过滤的方法从混合油中回收溶剂,再把浸出前使物料干燥到3.5%的水分禽嫩的能量消耗计算在内,异I!夭i醇冷
3、却回收过程可节约22%的能量,和易爆性低于iF己烷,浸出的油和粕的质!t£膨化预处叫!,冷却分离混合油,循q:¨11液和膜过滤回收异丙醇的条件下,异丙孵代替一己烷作为浸⋯溶剂是可行的。关键词:异丙醇,分离ABSTRACTTheresearchwasconductedfortheprocessingtechnologyandenergyrecyclingtoevaluateisopropylalcoholasanalternativeofhexaneforextractionsoybean,peanutandcottonseedoils.Theobjectwastoextracthi
4、ghqualityoilandmealbyisopropylalcoholatlowcostsandhighsafety.Thequalityofoilandmealofisopropylalcoholextractionwerecomparedwiththoseofhexane.Thesoyoilextractedbyisopropylalcoh01comprised0.1%lecithin.O.09%freefattyacid,theProteinDispersionIndex(PDI)ofsoymealwas61;thehexaneextractedsoyoilcompris
5、ed2.1%lecithin、O.7%freefattyacid,thePDIofsoymealwas14.Thecottonseedoilextractedbyisopropylalcoholdidnotcomprisedfreecottonhydroxybenzeneandaflatoxin,therewereO.013%freecottonhydroxybenzeneandO.0002%aflatoxininthemeal.Thepeanutoilextractedbyisopmpylalcoholcomprised0.45%freefattyacid.themealcomp
6、rised3%water,3.4%oil、43.1%proteinand6.5%ash.Theoilandmealqualityofisopropylalcoholextractedwerebetterthanhexaneextracted.Thesolventratiowouldbe2.5:1.iftheextractionconditionwasthesaoleashexane,whichneeded5timesenergytorecycletheisopropylalcoh01.Fordetractedthesolventratioandenergyforrecyclingt
7、hesolvent,theexpanding,chillingseparatingmiscella,recyclingup-phaseandthemembranefiltration.Theresultedratiowas1:1.Bymembranefiltrationisopropylalcoholwasconcentratedtomorethan93%atacceptableCOSTS8652kjenergywasneededtoevaporate1kg87.7%
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