CN108707470A - 一种油类脱金属剂及其制备方法与应用 - Google Patents
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Abstract
本发明提供一种油类脱金属剂,由如下重量百分比的原料组成:N‑甲基‑2‑吡咯烷酮1‑20%,乙二醇二乙醚二胺四乙酸1‑20%,N‑(2‑羟乙基)乙二胺‑N,N’,N’‑三乙酸1‑15%,乙二胺1‑20%,甲醇1‑20%,水5‑30%。同时,本发明还提供了该油类脱金属剂的制备方法和应用。本发明提供的油类脱金属剂,酸性有机络合剂与乙二胺反应,生成含有N、P元素化合物,并与N‑甲基‑2‑吡咯烷酮产生协同效应,提升了对金属元素的络合能力,同时避免了酸性物质对碳钢设备的腐蚀,脱金属效果好。
Description
技术领域
本发明属于金属脱除技术领域,具体涉及一种油类金属脱除剂及其制备方法与应用。
背景技术
原油、渣油、汽油、柴油、煤油和润滑油等油类中含有的铁、钙、镁等微量元素,通常以油溶性的有机金属化合物形式存在,可以呈络合形态或金属皂类以及胶体悬浮物形式存在于油中。油类产品中铁离子含量随沸点的升高而增加, 例如,在原油炼制过程中,原油经过蒸馏后, 金属大多存在渣油中。渣油作为原料进入催化装置, 金属,特别是铁的存在对催化裂解加工过程是有害的, 必须尽可能将其除去, 以延长催化剂的寿命。
油类中金属的脱除可采用添加金属脱除剂等方法,向油中加入某种脱金属剂,脱金属剂与以油溶性有机酸盐存在的金属盐发生反应,生成水溶性金属盐,或既难溶于水又难溶于油的金属盐类,然后通过水洗将油中水溶性、沉淀型金属盐脱除,也就是通常所讲的化学法脱金属。化学法脱金属具有费用低、操作简便等优点,但存在脱除效果不稳定、成本高、以及对设备发生腐蚀等问题。
发明内容
针对现有技术的缺陷,本发明提供一种油类金属脱除剂及其制备方法与应用,该金属脱除剂能有效降低油类中金属含量,同时能够避免脱金属剂的加注对油类生产、加工、储存造成的腐蚀。
一种油类脱金属剂,由如下重量百分比的原料组成:
N-甲基-2-吡咯烷酮1-20%,
乙二醇二乙醚二胺四乙酸1-20%,
N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸1-15%,
乙二胺1-20%,
甲醇1-20%,
水 5-30%。
优选地,所述的油类脱金属剂,由如下重量百分比的原料组成:
N-甲基-2-吡咯烷酮5-20%,
乙二醇二乙醚二胺四乙酸5-20%,
N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸5-15%,
乙二胺5-20%,
甲醇5-20%,
水 10-30%。
上述油类脱金属剂的制备方法,将N-甲基-2-吡咯烷酮、乙二醇二乙醚二胺四乙酸、N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸、乙二胺、甲醇、水混合搅拌即可。
上述油类脱金属剂的应用,所述应用为将所述油类脱金属剂直接注入油中,用于油的脱金属反应,所述油为原油、渣油、汽油、柴油、煤油、润滑油中的任意一种。
优选地,所述油类脱金属剂的注入量为油加工量的10-100mg/kg。
本发明提供的油类脱金属剂, 酸性有机络合剂 乙二醇二乙醚二胺四乙酸、N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸与乙二胺反应,生成含有N、P元素化合物,并与N-甲基-2-吡咯烷酮产生协同效应,提升了对金属元素的络合能力,同时避免了酸性物质对碳钢设备的腐蚀。该油类脱金属剂,借助较强的金属络合能力,将以有机盐存在的钙、铁、镁离子夺出,并生成稳定的水溶性金属络合物,这些金属络合物溶于水并随电脱盐脱除的水一并排除,最终达到脱金属的目的。
本发明的优点:
本发明提供的油类脱金属剂,对以有机盐形式存在的钙、铁、镁具有较好的脱除效果,能有效地降低油类中的金属含量,降低或避免油类生产、加工、运输过程中出现的因金属存在而导致的催化剂中毒、结垢等问题,具有用量少、同时不腐蚀金属设备的优点。
具体实施方式
实施例1
一种油类脱金属剂,由如下重量百分比的原料组成:N-甲基-2-吡咯烷酮20%,乙二醇二乙醚二胺四乙酸5%,N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸15%,乙二胺10%,甲醇20%,水30%;
所述油类脱金属剂的制备方法:将N-甲基-2-吡咯烷酮、乙二醇二乙醚二胺四乙酸、N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸、乙二胺、甲醇、水混合搅拌;
在实验室中评价该脱金属剂的效果,加入100mg/kg的脱金属剂时,每100g原油加脱金属剂0.01g,称量准确性低,所以配置成1%质量浓度的脱金属剂水溶液,加入油类中,称量准确性高。
脱金属效果的评价:
检测的油为92#汽油,所用92#汽油原始含铁、钙、镁分别为7.9mg/kg、2.1mg/kg、1.3mg/kg,具体方法如下;
取95g油,注入脱盐罐中,注入水5mL,直接注入1%质量浓度的脱金属剂水溶液、20mg/kg破乳剂,在温度120℃条件下预热15分钟后,振荡200次,然后在电场强度为800V/cm、脱盐温度120℃,脱盐时间40分钟,冷却后取样分析油中的铁、钙、镁含量,并计算油中各种金属的脱除率;
金属脱除率={[ 油中脱金属前某种金属的含量(mg/kg) - 油中脱金属后某种金属的含量(mg/kg)]÷油中脱金属前某种金属的含量(mg/kg)}×100%;
采用的电脱盐装置为YS-3 型电脱盐试验仪;油中金属含量分析采用电感耦合等离子发射光谱仪;破乳剂为市场销售的商品破乳剂,根据油类的性质进行选择,主要目的是加入脱水;
结果见表1;
表1 92#汽油的脱金属效果
实施例2
一种油类脱金属剂,由如下重量百分比的原料组成:N-甲基-2-吡咯烷酮1%,乙二醇二乙醚二胺四乙酸20%,N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸10%,乙二胺20%,甲醇20%,水29%;
制备方法同实施例1;
脱金属效果的评价同实施例1;
检测的油为陕北北部原油,所用原油中原始含铁、钙、镁分别为41.4mg/kg、29.2mg/kg、13.5mg/kg;检测结果见表2;
表2 原油中金属脱出效率
实施例3
一种油类脱金属剂,由如下重量百分比的原料组成:N-甲基-2-吡咯烷酮15%,乙二醇二乙醚二胺四乙酸20%,N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸5%,乙二胺15%,甲醇20%,水25%;
制备方法同实施例1;
脱金属效果的评价同实施例1;
检测的油为柴油,所用柴油中原始含铁、钙、镁分别为9.1mg/kg、2.2mg/kg、1.9mg/kg;检测结果见表3;
表3 柴油中金属脱出效率
备注:/ 代表未检测,因为在低含量的时候,检测结果已经达到99%以上了,所以,不再进行检测。
实施例4
一种油类脱金属剂,由如下重量百分比的原料组成:N-甲基-2-吡咯烷酮20%,乙二醇二乙醚二胺四乙酸20%,N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸1%,乙二胺19%,甲醇20%,水20%;
制备方法同实施例1;
脱金属效果的评价同实施例1;
检测的油为煤油,所用煤油中原始含铁、钙、镁分别为6.1mg/kg、1.1mg/kg、1.3mg/kg;检测结果见表4;
表4 煤油中金属脱出效率
备注:/ 代表未检测。
实施例5
一种油类脱金属剂,由如下重量百分比的原料组成:N-甲基-2-吡咯烷酮20%,乙二醇二乙醚二胺四乙酸20%,N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸15%,乙二胺20%,甲醇20%,水5%;
制备方法同实施例1;
脱金属效果的评价同实施例1;
检测的油为陕北北部渣油,所用渣油中原始含铁、钙、镁分别为79.1mg/kg、39.2mg/kg、22.7mg/kg;检测结果见表5。
表5 渣油中金属脱出效率
腐蚀性评价
采用实施例5提供的脱金属剂,配置质量浓度为1%、0.1%、0.01%的脱金属剂水溶液,分别称取250g 1%、0.1%、0.01%的脱金属剂水溶液置于广口瓶中;挂片选用材质为20#、J55和N80,分别平行挂片两个,保证试片全部表面与水样接触。测试温度85℃,将挂片的广口瓶放入已恒温的水浴中半小时后开始计录时间,挂片放置24h观察腐蚀状况并做记录;
将观察后试片立即用水冲洗,剪掉鱼线,然后用无水乙醇逐片洗净两次,用冷风吹干,放入干操器20min后称量(精确至0.0001 g)并作记录;然后将试片用体积分数为10%盐酸溶液清洗试片,用无水乙醇逐片洗净两次,用冷风吹干,放入干操器20min后称量(精确至0.0001 g)并作记录。
表6 脱金属剂腐蚀性测试
由表1-5可知,本发明提供的油类脱金属剂,对铁、钙、镁的脱除效果好,用量少,由表6可知,该脱金属剂,对金属设备的腐蚀较弱。
Claims (5)
1.一种油类脱金属剂,其特征在于:由如下重量百分比的原料组成:
N-甲基-2-吡咯烷酮1-20%,
乙二醇二乙醚二胺四乙酸1-20%,
N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸1-15%,
乙二胺1-20%,
甲醇1-20%,
水 5-30%。
2.根据权利要求1所述的油类脱金属剂,其特征在于:由如下重量百分比的原料组成:
N-甲基-2-吡咯烷酮5-20%,
乙二醇二乙醚二胺四乙酸5-20%,
N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸5-15%,
乙二胺5-20%,
甲醇5-20%,
水 10-30%。
3.权利要求1或2所述油类脱金属剂的制备方法,其特征在于:所述制备方法为:将N-甲基-2-吡咯烷酮、乙二醇二乙醚二胺四乙酸、N-(2-羟乙基)乙二胺-N,N’,N’-三乙酸、乙二胺、甲醇、水混合搅拌即可。
4.权利要求1所述油类脱金属剂的应用,其特征在于:所述应用为将所述油类脱金属剂直接注入油中,用于油的脱金属反应,所述油为原油、渣油、汽油、柴油、煤油、润滑油中的任意一种。
5.根据权利要求4所述油类脱金属剂的应用,其特征在于:所述油类脱金属剂的注入量为油加工量的10-100mg/kg。
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