CN108421543A - 一种含油脂的活性炭处理方法 - Google Patents
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Abstract
一种含油脂的活性炭处理方法。技术领域:资源利用、环保大气治理、油脂、活性炭。本发明是一套用清洁生产的理念全新组合成一套完整的炭吸附法处理油脂烟气后饱和的活性炭综合利用的工艺方法。是将吸附后的含油活性炭用6号抽提油在提取罐中提取,提取剂在闪蒸罐中进行闪蒸(回收并套用溶剂)得粗品油脂‑再经[碱洗、凝聚];[静置、分层];[白土脱色];[活性炭除嗅];[过滤]多种工序处理得净化油脂。提取后的活性炭‑经干馏、培烧、活化等工序处理得可重复使用的再生活性炭。
Description
技术领域:资源利用、环保大气治理、油脂、活性炭
在我国每年食用油脂的消耗量是3800多万吨,其中近30%用于工业生产如纺织品的润滑油等。消耗量大的主要是家庭、食品和餐饮行业,据估计近三千万吨的 食用油脂中约有10%以上会变成烟气,也就是说最少有300万吨的油烟可能会排 向大气,虽然在国家的推进下;餐饮和家庭普遍采用一定的处理措施,但处理量 和收到的效果不很显著,据估计总排出油烟回收率不到一半,也就是说在油烟处 理方面,还需要寻找新的更好的方法来普及和推广,或者说有100-200万吨“油 烟”是有回收的可能性的。常用的油烟处理方法有:过滤法、旋风分离法、活性 炭吸附法、蜂窝式净化法、水雾水膜洗涤法、运水烟罩技术、静电法等方法。这 些方法各有利弊,其中活性炭吸附法是占空间小操作方便处理率高和稳定的方 法,但投资较大,吸附后的活性炭成为企业的负担。本专利就是针对用于油烟吸 附的活性炭进行回收处理,以达到回收油脂、再生活性炭的目的。这些吸附后的 活性炭含油量约20-35%,呈半固体、半胶体状。有人试图用皂化法将其制成去 污粉,不但去污性差,还污染所去污的物质。目前被当做固体废物出钱去处理。 活性炭吸附在处理食用油脂所产生的烟气上,处理率高能做到完全达标排放已经 被业内所公认。但这种方法推行的障碍是费用一活性炭较贵,用后的“油炭”要 出钱处理。因此解决了所含油脂的回收;活性炭再生后重复使用,无论对环境还 是资源使用,都是有较大的意义的。
发明内容:本专利是一套用清洁生产的理念全新组合成一套完整的炭吸附法处理油脂烟气后饱和的活性炭综合利用的工艺方法。主要内容是:
1、将吸附后的含油活性炭用6号抽提油提取:在多功能提取罐中,升温到50℃ 以上方可开搅拌,并在50-60℃保温,优选65℃±2℃用泵将溶剂强制循环。溶 剂与“油炭”重量比为3-4.5∶1,时间2-4h,分为多级优选三级,三提和二提的 温度应适当低些。多功能提取罐,是金属罐子有升降温的夹层或内壁半管、投料 口较大、罐底是可开启卸料罐底是托起的使罐内物料被架空、罐内设有搅拌器、 罐外配有冷凝器和阻火器。处理后的活性炭中油脂含量≤5‰。
2、将第三级溶剂在闪蒸罐中进行闪蒸-溶剂用泵加压到喷雾头上,闪蒸罐是抽 真空的。得到回收的粗油脂和可重复使用的溶剂;
3、回收的粗油脂用本发明人所申请《一种废食用油脂的处理方法》申请号201711164223.1经过:经[碱洗、凝聚];[静置、分层];[白土脱色];[活性炭 除嗅];[过滤]多种工序处理得净化油脂。
4、活性炭的再生,采用业内普遍采用的比较成熟的高温再生法。
4.1)干馏(传统上叫干燥是用来处理浸水炭的,在本专利中油炭中含易燃易爆 的溶剂油,在经济要回收,在安全上要去除。)先将提取后的活性炭在提取中干 馏一将抽出溶剂后的油炭在罐中加热到100-140℃保温2-4小时,目的是将活性 炭中残余的溶剂挥发出来。
4.2)焙烧-将干馏后的活性炭,置于炭处理设备中,进行控氧升温,到800-900℃,此过程,一般用时3-4小时,是使活性炭上吸附的一部分有机物沸腾、汽化脱附, 一部分有机物发生分解反应,生成小分子烃脱附出来,残余成分留在活性炭孔隙 内成为″固定炭″。在这一阶段,温度将达到800-900℃,为避免活性炭的氧化, 一般在抽真空或惰性气氛--假如氮气保护下进行。
4.3)活化,往活性炭处理设备内通入CO2、CO、H2或水蒸气等气体,以清理活 性炭微孔,使其恢复吸附性能,温度800-900℃。
具体实施:1、提取与干馏:将收集的吸附了油烟的活性炭除去包装材料投入提 取罐中,所述的提取罐是:有较大投料口的,有夹层或内壁有半管用于通蒸汽升 温的,罐内有搅拌器,罐底是可打开的;罐底部是托起的并托有筛网,网孔径应 小于炭的颗粒,在罐子上方应连接有通有冷媒的冷凝器。在罐投料口将去掉包装 材料的:油炭投入罐中,盖紧投料口,泵入溶剂油,“油炭”与溶剂油的重量比 为1∶2.5-4,因油炭粘度大,故需要浸泡一会并升高温度到50-60℃后,待其软 化后方可开搅拌,因操作是常压提取,故罐子一大气连接处应有冷媒降温的冷凝 器以减少溶剂的挥发。提取方式是强制循环加搅拌。提取是多级的,提取多级(以 三级为例)是用新溶剂提取已经提二次的“油炭”用二次溶剂对提过一次的“油 炭”提取;用三次溶剂对“油炭”进行首次提取,每次提取2-4小时。这种方式 溶剂利用率高,油炭残余低。三次提取后的“油炭”中还有比较多的溶剂,故油 炭不出提取就在罐中进行干馏。干馏是,关闭搅拌(如果搅拌的功率大、转速低、 能搅动可以不关)用循环泵将溶剂打出后关闭循环系统,罐子升温,用温度来挥 发炭中所含溶剂,并被冷凝器回收溶剂。干馏结束后用夹层通水或从罐底吹风降 温。降温后,开罐底放出去除了“油烟的炭”,送到活性炭处理设备中。
2、提取后的溶剂处理:一提和二提后的溶剂在中转罐中待用。三提的溶剂用泵 输送到闪蒸罐中,用泵的压力经进料喷嘴向闪蒸器喷雾,因闪蒸器是抽真空的, 故溶剂瞬间气化被冷凝器所收集。余下的就是所提取回来的“油烟”一粗油脂。 粗油脂经过:经[碱洗、凝聚];[静置、分层];[白土脱色];[活性炭除嗅];[过 滤]多种工序处理得净化油脂。
3、脱脂后炭的处理,油炭经溶剂提取和干馏将所含的大多数低沸点成份已经去除,但仍然一些高沸点的油脂和聚合物残留严重影响着炭的吸附能力,故采用业 内成熟的高温再生法(建议由专业进行炭高温再生的厂家进行处理)。有二个过 程:先是焙烧-用高温来气化炭中所吸附的部分有机物质,也有部分成份在此过 程被热裂解成小分子而挥发,还有一部份被“炭化”,此过程可定时向内通惰性 气以助于气体的析出。后是活化一往活性炭处理设备内通入CO2、CO、H2或水 蒸气等气体,以清理活性炭微孔,使其恢复吸附性能。
Claims (6)
1.一种含油脂的活性炭处理方法是,由多级提取;溶剂油脂分离;油脂精制;活性炭再生等多个工艺所组成的一个整套的技术方案。
2.权利要求1所述多级提取是,将吸附后的含油活性炭用6号抽提油提取:在多功能提取罐中,升温到50℃以上方可开搅拌,并在50-60℃保温,优选55℃±2℃用泵将溶剂强制循环。溶剂与“油炭”重量比为3-4.5∶1,时间2-4h,分为多级-优选三级,溶液与“油炭”的工艺走向是逆向的。
3.权利要求1所述溶剂油脂分离是,将最后级(第三级)溶剂在闪蒸罐中进行闪蒸-溶剂用泵加压到喷雾头上,在闪蒸罐内喷雾,过程是抽真空的,得到回收的粗油脂和可重复使用的溶剂。
4.权利要求1所述油脂精制是,将回收的粗油脂用本发明人所申请《一种废食用油脂的处理方法》申请号201711164223.1经过:经[碱洗、凝聚];[静置、分层];[白土脱色];[活性炭除嗅];[过滤]多种工序处理得净化油腊。
5.权利要求1所述活性炭的再生,包含三部分内容:
5.1)干馏(传统上叫干燥是用来处理浸水炭的,在本专利中油炭中含易燃易爆的溶剂油,在经济要回收,在安全上要去除)先将提取后的活性炭在提取中干馏一将抽出溶剂后的油炭在罐中加热到100-140℃保温2-4小时,目的是将活性炭中残余的溶剂挥发出来;
5.2)焙烧-将干馏后的活性炭,置于炭处理设备中,进行控氧升温,到800-900℃,此过程,一般用时2-4小时,是使活性炭上吸附的一部分有机物沸腾、汽化脱附,一部分有机物发生分解反应,生成小分子烃脱附出来,残余成分留在活性炭孔隙内成为″固定炭″。在这一阶段,温度将达到800-900℃,为避免活性炭的氧化,一般在抽真空或惰性气氛-假如氮气保护下进行;
5.3)活化,往活性炭处理设备内通入CO2、CO、H2或水蒸气等气体,以清理活性炭微孔,使其恢复吸附性能。
6.权利要求2所述多功能提取罐,是金属罐子有升降温的夹层或内壁半管、投料口较大、罐底是可开启卸料罐底是托起的使罐内物料被架空、罐内设有搅拌器、罐外配有冷凝器和阻火器。
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