第四百一十八章 浓硫酸
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李植看了看那一缸绿矾油，点了点头。龙腾小说ltxsba.com曹守道从屋子里找出一根废铁棍子来，将废铁棍子伸进了那绿矾油里。没一会，就有细小的气泡从铁棍上一点点冒出，无色的绿矾油则便变成了浅绿色。
李植知道，这是稀硫酸和铁反应，生成了硫酸亚铁和氢气。当然，这种绿矾油中还有大量的亚硫酸。但是亚硫酸并不稳定，只要静置一段时间，亚硫酸就会被氧化为硫酸。
有了硫酸，李植就能制造硝酸了，李植心里高兴，说道：“曹道长，你这一套技术，多少银子卖给我？”
曹守道说道：“伯爷，我这一套东西看上去简单，其实作用不小，一寸绿矾都不浪费，一丝绿矾油都不跑漏。这是先师传下来的技艺，若伯爷想买，我作价一百两卖给伯爷。”
李植眨了眨眼睛，暗道这道士还真会做买卖。以前提炼汞的设备一百两卖给自己，这会绿矾油的技术又要一百两。李植舔了舔嘴唇，还价说道：“道长，这设备看上去远没有水银那一套东西复杂，怎么能卖一百两？”
曹守道抚须沉吟，许久才说道：“八十两！八十两卖给伯爷。不能再少了，再少就对不起先师了。”
李植笑了笑，又和曹守道杀了几句价，曹守道却咬着八十两不放。说起来，曹守道帮李植解决了硫酸的来路，功劳不算小。李植没有办法，只能付了八十两给这个道人，买下了他的技术。
曹守道得了银子，就把那一套坛坛罐罐交给了李植的亲卫们。众人带着曹守道回到总兵府，曹守道在总兵府的后院里指导李植的亲卫们，修起了一个小土灶，又手把手教会了亲卫使用方法和注意事项。
李植站在一边听了一会，才发现这里面名堂不少。光是那坩埚如何加热都有好几个要点，若是没有人指导靠自己摸索，恐怕要花几个月，烧坏无数原材料和器材才能摸索出来。
这八十两银子，说起来也不算太坑人。
李植的亲卫学完了曹守道的技术，当场操作了几遍，确认学通了，曹守道才甩着拂尘离开了总兵府。
得了稀硫酸，李植就要开始制造浓硫酸了。只有得到浓硫酸，才能制成硝酸。
用稀硫酸制造浓硫酸，说起来也颇有些难度。因为硫酸是不能靠简单蒸馏提纯的。想要通过蒸馏提纯硫酸，必须是减压蒸馏。而减压蒸馏需要真空泵或者类似的装备，对于现在的李植来说这是是根本得不到的。
不过李植穿越前玩过硫酸。那时候政府控制硫酸浓度，不让商店出售浓硫酸，只有百分之七十的硫酸出售。李植当时为了提纯硫酸，研究过不少办法，最后发现一种最简单易行的提纯办法，就是电解稀硫酸。
所谓的电解稀硫酸，其实就是将稀硫酸通电。硫酸溶液通电后，其中的水份会被电解成氢气和氧气，而硫酸则被保存了下来。通电较长时间后，稀硫酸就会变成高浓度的浓硫酸。
李植之前已经做过简单的发电机，这次发电机派上用场了。
不过要把稀硫酸中的水分分解掉，需要较大功率的发电机。人力是无法实现这样的功率了，需要用蒸汽机带动发电机转动。李植这次制作了一个较大的铜线圈，那一道道铜线上全都刷了一层厚厚的树漆绝缘，用蒸汽机驱动，放在两块大磁铁中。
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