CN105749863A - 一种复合脱硫剂及其制备方法 - Google Patents
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Abstract
本发明公开了一种复合脱硫剂,由以下重量份的物质组成,氧化锌颗粒510份,氧化钙86份,碳酸钠68份,碱性硫酸铝46份,焦炭58份,氟化钙46份,椰壳活性炭58份,改性凹凸棒土48份,助吸附组分58份,扩孔剂26份,氧化铝45份,氧化锰颗粒410份、催化剂58份。本发明采用上述技术方案的复合脱硫剂,可将硫脱至 1ppm 以下,吸附硫容能力大,操作费用低,无污染,使用寿命长;采用上述制备方法,工艺简单,成本低,适合工业化生产,无有害物质生成。
Description
技术领域
本发明涉及脱硫剂技术领域,具体地说是涉及一种能够在常温下具有
较高的催化活性的复合脱硫剂及其制备方法。
背景技术
我国商品汽油中有 70%左右是来自重油催化裂化过程,由于重油原料含有大量的硫、氮、氧杂原子化合物和胶质沥青质,催化裂化汽油不仅硫含量高,还含有大量的烯烃组分,商品汽油中 90%以上的硫来自于催化裂化汽油,这使得我国汽油的硫含量要远远超出国外汽油的硫含量。因此,如何降低催化裂化汽油中硫含量是降低商品汽油硫含量的关键。
石油中的硫化物在石油炼制过程中生成硫化氢、单质硫以及硫醇、硫醚等,大部分硫化氢以气体的形式富集在炼厂气 ( 如液化气、干气中 ),少量的硫化氢、大部分的单质硫、硫醇、硫醚则富集在油品中。目前对于含硫气体脱除硫化物,大都采用醇胺化合物 ( 如乙醇胺、二乙醇胺、N- 甲基二乙醇胺等 ) 中的一种或几种混合复配的醇胺脱硫剂,油品中的硫化物则采用碱洗加催化氧化工艺。其中碱洗是采用 10% -20%的碱清除油品中的硫化氢,催化氧化则是将硫醇氧化成硫醚,碱洗生成大量含硫废碱渣,产生环境问题,催化氧化硫醇则是将硫醇以硫醚的形式留存在油品中,并不能降低油品硫含量。二次加工油品中由于含有大量的烯烃,经过碱洗、催化氧化等处理会有大量的副反应发生,影响油品的质量。
特别是 2018 年 1 月 1 日全国即将实行的国五汽油质量标准中规定汽油含硫量不高于10ppm,探索和推广汽油深度脱硫技术成为炼油工业的迫切需要。炼油行业采用的脱硫技术分为加氢脱硫和非加氢脱硫技术,其中加氢脱硫是现在的主要脱硫途径,但是仅靠该工艺将硫含量降至 10ppm 之下时,大量饱和烯烃造成辛烷值大幅度降低。非加氢脱硫技术又分为吸附脱硫、氧化脱硫、萃取脱硫、生物脱硫等技术,目前研究非常广泛的吸附脱硫技术,因为其在常温常压的条件下进行,能耗低,辛烷值几乎不损失,是有潜力的深度脱硫途径之一。
对于吸附脱硫技术来说,吸附剂的吸附硫容和选择性是核心。公开号为CN101804325A 的专利公开一种改性活性炭吸附脱硫剂的制备方法,其以椰壳活性炭为载体,加入浓硝酸、浓硫酸或过硫酸铵等氧化剂进行改性后负载铜、银、镍、铈等活性组分,活性组分金属氧化物含量占活性炭重量的 1-20%,烘干后即得脱硫剂。该脱硫剂对硫的选择性低,硫容有限,此外吸附剂寿命较短。
综上所述,现有技术中的吸附脱硫剂普遍存在以下不足:
1、脱硫深度不够;
2、吸附剂比表面积较低,吸附硫容较为有限 ;
3、脱硫过程的操作条件苛刻并且能耗大,操作费用较高 ;
4、脱硫过程对环境不友好 ;
5、脱硫剂的选择性低,寿命较短 ;
6、脱硫剂再生时工艺复杂。迄今为止,尚无较好地克服上述多种不足的吸附脱硫剂。
发明内容
本发明要解决的技术问题是针对现有技术的不足提供一种加入1-5 ‰ 脱硫剂,可使油品的含硫量降至1ppm以下;吸附硫容能力大,1g脱硫剂可处理50ml油品;操作费用低,无污染,无腐蚀,使用寿命长的复合脱硫剂;
本发明还提供了一种工艺简单,成本低,适合工业化生产,无有害物质生成的复合脱硫剂制备方法。
为解决上述技术问题本发明采用以下技术方案:一种复合脱硫剂,其特征在于:由以下重量份的物质组成,氧化锌颗粒5-10份,氧化钙8-6份,碳酸钠6-8份,碱性硫酸铝4-6份,焦炭5-8份,氟化钙4-6份,椰壳活性炭5-8份,改性凹凸棒土4-8份,助吸附组分5-8份,扩孔剂2-6份,氧化铝4-5份,氧化锰颗粒4-10份、催化剂5-8份。
以下是本发明的进一步改进:
所述氧化锌颗粒平均粒子直径为24.6nm,氧化锰颗粒的平均粒子直径为 24.6nm。
进一步改进:
所述氧化铝选自拟薄水铝石、三水铝石、软水铝石、γ- 氧化铝、α- 氧化铝、δ- 氧化铝、θ- 氧化铝或它们的混合物。
进一步改进:
所述改性凹凸棒土由以下重量份的原料制成 :凹凸棒土80份、玉石粉20份、高岭土15份、交联剂10份、氢氧化铝5份、硬脂酸锌10份、硫酸钛8份、氧化镧4份、氧化铬6份、水4份 ;
上述改性凹凸棒土的制备方法如下,首先将上述重量份的凹凸棒土、玉石粉、高岭土送入煅烧炉中,在1000°下煅烧8小时,取出,洒上交联剂,再放入水中研磨,调节研磨液PH值为4-5,研磨3小时,得到80-100目浆料,再调节研磨液 PH 值为中性,加入其它剩余成分,继续研磨,得到 80-100 目浆料,喷雾干燥,制得改性凹凸棒土。
进一步改进:
所述助吸附组分为氧化铜,所述扩孔剂为碳酸铵。
进一步改进:
所述催化剂由以下重量份的原料组成,气相白炭黑4份,氧化镍4份,氧化镁5份,二氧化钛4份、氧化硅2份;
上述催化剂采用如下方法制备,将气相白炭黑、氧化镍、氧化镁、二氧化钛及氧化硅混合均匀,使所的混合物颗粒化形成颗粒,在110-150℃下干燥,然后在300-550℃下焙烧,将焙烧后的颗粒还原,制得催化剂,还原条件为,压力0.01-1Mpa,温度350-550℃,还原时间为2-6小时,还原剂为氢气。
一种复合脱硫剂的制备方法,包括如下步骤,
a、焙烧处理
将氧化锌颗粒5-10份,氧化钙8-6份,碳酸钠6-8份,碱性硫酸铝4-6份,焦炭5-8份,氟化钙4-6份,椰壳活性炭5-8份,改性凹凸棒土4-8份,助吸附组分5-8份,扩孔剂2-6份,氧化铝4-5份,氧化锰颗粒4-10份、催化剂5-8份混合均匀,送入煅烧炉中,在 200-1300℃下焙烧2-10 小时得到颗粒;
b、酸化处理
将上述颗粒融入浓度为0.5mol/L的硝酸锌溶液中,搅拌均匀后活化 2h,进行粉碎处理,粉碎粒度 10-100 目;
c、挤压、晾晒
将粉碎后的颗粒,在低压 4MPa 下保持10分钟,在高压 10-40MPa 下连续挤压成型,然后晾晒,晾晒后混合物的含水率≤ 30%;
d、筛分
用振动筛进行筛分,混合物颗粒细度控制在0.1-3mm;
e、焙烧
将筛分后的混合物放入焙烧炉中进行焙烧,焙烧温度控制在300-350℃,焙烧时间控制在1.5-2小时,冷却后得到成品脱硫剂。
本发明采用上述技术方案的复合脱硫剂,加入1-5 ‰ 脱硫剂,可使油品的含硫量降至1ppm以下,1g脱硫剂可处理50ml油品,操作费用低,无污染,无腐蚀,使用寿命长;采用上述制备方法,工艺简单,成本低,适合工业化生产,无有害物质生成,燃烧后释放的SO2 满足环保要求;能够制备比表面积大,活性高,脱硫性能好,且循环利用次数多的脱硫剂。
具体实施方式
实施例1,一种复合脱硫剂, 由以下重量份的物质组成,氧化锌颗粒5-10份,氧化钙8-6份,碳酸钠6-8份,碱性硫酸铝4-6份,焦炭5-8份,氟化钙4-6份,椰壳活性炭5-8份,改性凹凸棒土4-8份,助吸附组分5-8份,扩孔剂2-6份,氧化铝4-5份,氧化锰颗粒4-10份、催化剂5-8份。
所述氧化锌颗粒平均粒子直径为24.6nm,氧化锰颗粒的平均粒子直径为 24.6nm。
所述氧化铝选自拟薄水铝石、三水铝石、软水铝石、γ- 氧化铝、α- 氧化铝、δ- 氧化铝、θ- 氧化铝或它们的混合物。
所述改性凹凸棒土由以下重量份的原料制成 :凹凸棒土80份、玉石粉20份、高岭土15份、交联剂10份、氢氧化铝5份、硬脂酸锌10份、硫酸钛8份、氧化镧4份、氧化铬6份、水4份 。
上述改性凹凸棒土的制备方法如下,首先将上述重量份的凹凸棒土、玉石粉、高岭土送入煅烧炉中,在1000°下煅烧8小时,取出,洒上交联剂,再放入水中研磨,调节研磨液PH值为4-5,研磨3小时,得到80-100目浆料,再调节研磨液 PH 值为中性,加入其它剩余成分,继续研磨,得到 80-100 目浆料,喷雾干燥,制得改性凹凸棒土。
所述助吸附组分为氧化铜,所述扩孔剂为碳酸铵。
所述催化剂由以下重量份的原料组成,气相白炭黑4份,氧化镍4份,氧化镁5份,二氧化钛4份、氧化硅2份。
上述催化剂采用如下方法制备,将气相白炭黑、氧化镍、氧化镁、二氧化钛及氧化硅混合均匀,使所的混合物颗粒化形成颗粒,在110-150℃下干燥,然后在300-550℃下焙烧,将焙烧后的颗粒还原,制得催化剂,还原条件为,压力0.01-1Mpa,温度350-550℃,还原时间为2-6小时,还原剂为氢气。
一种复合脱硫剂的制备方法,包括如下步骤,
a、焙烧处理
将氧化锌颗粒5-10份,氧化钙8-6份,碳酸钠6-8份,碱性硫酸铝4-6份,焦炭5-8份,氟化钙4-6份,椰壳活性炭5-8份,改性凹凸棒土4-8份,助吸附组分5-8份,扩孔剂2-6份,氧化铝4-5份,氧化锰颗粒4-10份、催化剂5-8份混合均匀,送入煅烧炉中,在 200-1300℃下焙烧2-10 小时得到颗粒;
b、酸化处理
将上述颗粒融入浓度为0.5mol/L的硝酸锌溶液中,搅拌均匀后活化 2h,进行粉碎处理,粉碎粒度 10-100 目;
c、挤压、晾晒
将粉碎后的颗粒,在低压 4MPa 下保持10分钟,在高压 10-40MPa 下连续挤压成型,然后晾晒,晾晒后混合物的含水率≤ 30%;
d、筛分
用振动筛进行筛分,混合物颗粒细度控制在0.1-3mm。
e、焙烧
将筛分后的混合物放入焙烧炉中进行焙烧,焙烧温度控制在300-350℃,焙烧时间控制在1.5-2小时,冷却后得到成品脱硫剂。
Claims (7)
1.一种复合脱硫剂,其特征在于:由以下重量份的物质制成,氧化锌颗粒5-10份,氧化钙8-6份,碳酸钠6-8份,碱性硫酸铝4-6份,焦炭5-8份,氟化钙4-6份,椰壳活性炭5-8份,改性凹凸棒土4-8份,助吸附组分5-8份,扩孔剂2-6份,氧化铝4-5份,氧化锰颗粒4-10份、催化剂5-8份。
2.根据权利要求1所述的复合脱硫剂,其特征在于:所述氧化锌颗粒平均粒子直径为24.6nm,氧化锰颗粒的平均粒子直径为 24.6nm。
3.根据权利要求1所述的复合脱硫剂,其特征在于:所述氧化铝选自拟薄水铝石、三水铝石、软水铝石、γ- 氧化铝、α- 氧化铝、δ- 氧化铝、θ- 氧化铝或它们的混合物。
4.根据权利要求1所述的复合脱硫剂,其特征在于:所述改性凹凸棒土由以下重量份的原料制成 :凹凸棒土80份、玉石粉20份、高岭土15份、交联剂10份、氢氧化铝5份、硬脂酸锌10份、硫酸钛8份、氧化镧4份、氧化铬6份、水4份 ;
上述改性凹凸棒土的制备方法如下,首先将上述重量份的凹凸棒土、玉石粉、高岭土送入煅烧炉中,在1000°下煅烧8小时,取出,洒上交联剂,再放入水中研磨,调节研磨液PH值为4-5,研磨3小时,得到80-100目浆料,再调节研磨液 PH 值为中性,加入其它剩余成分,继续研磨,得到 80-100 目浆料,喷雾干燥,制得改性凹凸棒土。
5.根据权利要求1所述的复合脱硫剂,其特征在于:所述助吸附组分为氧化铜,所述扩孔剂为碳酸铵。
6.根据权利要求1所述的复合脱硫剂,其特征在于:所述催化剂由以下重量份的原料组成,气相白炭黑4份,氧化镍4份,氧化镁5份,二氧化钛4份、氧化硅2份;
上述催化剂采用如下方法制备,将气相白炭黑、氧化镍、氧化镁、二氧化钛及氧化硅混合均匀,使所的混合物颗粒化形成颗粒,在110-150℃下干燥,然后在300-550℃下焙烧,将焙烧后的颗粒还原,制得催化剂,还原条件为,压力0.01-1Mpa,温度350-550℃,还原时间为2-6小时,还原剂为氢气。
7.一种复合脱硫剂的制备方法,包括如下步骤,
a、焙烧处理
将氧化锌颗粒5-10份,氧化钙8-6份,碳酸钠6-8份,碱性硫酸铝4-6份,焦炭5-8份,氟化钙4-6份,椰壳活性炭5-8份,改性凹凸棒土4-8份,助吸附组分5-8份,扩孔剂2-6份,氧化铝4-5份,氧化锰颗粒4-10份、催化剂5-8份混合均匀,送入煅烧炉中,在 200-1300℃下焙烧2-10 小时得到颗粒;
b、酸化处理
将上述颗粒融入浓度为0.5mol/L的硝酸锌溶液中,搅拌均匀后活化 2h,进行粉碎处理,粉碎粒度 10-100 目;
c、挤压、晾晒
将粉碎后的颗粒,在低压 4MPa 下保持10分钟,在高压 10-40MPa 下连续挤压成型,然后晾晒,晾晒后混合物的含水率≤ 30%;
d、筛分
用振动筛进行筛分,混合物颗粒细度控制在0.1-3mm;
e、焙烧
将筛分后的混合物放入焙烧炉中进行焙烧,焙烧温度控制在300-350℃,焙烧时间控制在1.5-2小时,冷却后得到成品脱硫剂。
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