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公开(公告)号：US4010245A
公开(公告)日：1977-03-01
申请号：US596050
申请日：1975-07-15
摘要： In the production of hydrofluoric acid and calcium sulfate by subjecting sulfuric acid and fluorspar to a partial preliminary reaction in a preliminary reaction zone and the reaction is completed in an after-reaction zone at a temperature from about 100.degree. to 500.degree. C, the improvement which comprises effecting the preliminary reaction by circulating preliminary reaction product through said preliminary reaction zone, adding to the circulating preliminary reaction product at spaced locations in the preliminary reaction zone sulfuric acid preheated to a temperature of about 80.degree. to 200.degree. C and fluorspar preheated to a temperature of about 400.degree. to 800.degree. C, removing from said preliminary reaction zone gaseous hydrofluoric acid and a substantially dry mixture of calcium sulfate, unreacted sulfuric acid and fluorspar, and passing said dry mixture of calcium sulfate, unreacted sulfuric acid and fluorspar to said after-reaction zone. Only some of the necessary sulfuric acid may be supplied to the preliminary reaction zone and the balance supplied to the after-reaction zone. Heating of the preliminary reaction zone can be external or materials can be added which will react exothermically, e.g. SO.sub.3 to react with water in the system, CaO to react with sulfuric acid. A suitable apparatus is provided, comprising two parallel troughs connected at their ends by overflows and with oppositely rotating screws to circulate the contents. Means are provided for introducing reactants at spaced locations and for removing a mixture of product plus unreacted starting materials.
摘要翻译： 在通过在预反应区中进行硫酸和氟化物部分预反应的氢氟酸和硫酸钙的生产中，反应区域在约100-500℃的温度下在反应后区域完成， 其包括通过使预反应产物循环通过所述预反应区进行预反应，将预反应区中的间隔位置加入到循环的预反应产物中，硫酸预热至约80℃至200℃的温度，并将氟石预热至 约400-800℃的温度，从所述预反应区除去气态氢氟酸和基本上干燥的硫酸钙，未反应的硫酸和氟石的混合物，并将硫酸钙，未反应的硫酸和氟石的干混合物通入 说后反应区。 可以仅将一些必需的硫酸供应到预反应区，并将余量供给到反应后区。 预反应区的加热可以是外部的，或者可以添加可以放热反应的材料，例如 SO3与体系中的水反应，CaO与硫酸反应。 提供了一种合适的装置，包括两个平行的槽，它们的端部通过溢流和相对旋转的螺钉连接，以使内容物循环。 提供了用于在间隔位置引入反应物并用于除去产物混合物加未反应的起始材料的方法。
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公开(公告)号：US4150102A
公开(公告)日：1979-04-17
申请号：US873036
申请日：1978-01-27
CPC分类号： C01B7/195 , B01D53/1456 , C01B7/191
摘要： A process for the production of highly pure concentrated hydrofluoric acid by purifying crude HF gas containing H.sub.2 O, SO.sub.2, SiF.sub.4, S,CaF.sub.2, H.sub.2 SO.sub.4 and CaSO.sub.4 and obtained in the reaction of fluorite and sulphuric acid, whereby the resultant HF has an H.sub.2 SO.sub.4 content of the order of a few ppm, there are substantially no deposits of CaSO.sub.4 in the first H.sub.2 SO.sub.4 washing circuit and the service life of the system is considerably lengthened.
摘要翻译： 通过纯化含有H 2 O，SO 2，SiF 4，S，CaF 2，H 2 SO 4和CaSO 4并在萤石和硫酸的反应中获得的粗HF HF气体来生产高纯度浓氢氟酸的方法，由此得到的HF具有H 2 SO 4含量 在几ppm的数量级，在第一个H2SO4洗涤回路中基本上没有CaSO4沉积物，并且系统的使用寿命显着延长。
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