公开(公告)号：US3919399A

公开(公告)日：1975-11-11

申请号：US33559673

申请日：1973-02-26

Applicant: BAYER AG

Inventor： SCHABACHER WERNER ,  ROHE HERMANN ,  KELLER WOLFGANG ,  SPRECKELMEYER BERNHARD

IPC: C01B7/19 ,  C01B7/22

CPC classification number: C01B7/191

Abstract: The present invention relates to a process for recovering hydrogen fluoride from the gaseous reaction product of a metal fluoride with sulfuric acid by washing the gaseous product in a first stage with concentrated sulfuric acid and thereby cooling the gas to a temperature of about 60* to 130*C, cooling said gas by indirect heat exchange with water to a temperature of about 30* to 50*C in a second stage and in a third stage by direct heat exchange with pure hydrofluoric acid to a temperature of about 20* to 25*C, condensing hydrogen fluoride in the cooled gaseous product of the third stage in at least two additional stages and recovering condensed hydrogen fluoride.

Abstract translation: 本发明涉及一种从金属氟化物与硫酸的气体反应产物中回收氟化氢的方法，该方法是在第一阶段用浓硫酸洗涤气态产物，从而将气体冷却至约60°至130℃ DEG，通过与水的间接热交换在第二阶段和第三阶段通过与纯氢氟酸直接热交换至约20°至25℃的温度来冷却所述气体 C，在至少两个附加阶段中将第三阶段的冷却的气态产物中的氟化氢冷凝并回收冷凝的氟化氢。

公开(公告)号：US3878294A

公开(公告)日：1975-04-15

申请号：US42642373

申请日：1973-12-19

Applicant: BAYER AG

Inventor： SCHABACHER WERNER ,  GUTH HANS ,  ROHE HERMANN ,  KELLER WOLFGANG

IPC: C01B7/19 ,  C01B33/10 ,  C01F11/46 ,  C01G1/10 ,  C01B7/22

CPC classification number: C01B7/192 ,  C01B33/103 ,  C01F11/46 ,  C01G1/10

Abstract: In the production of hydrogen fluoride and metal sulfates by the reaction of sulfuric acid and a metal fluoride, e.g. fluorspar, wherein the fluorspar is preheated, the improvement which comprises effecting the preheating by continuously heating the metal fluoride to about 500* to 800*C in a gas/solid suspension with a gas charge of about 0.2 to 4 kg/Nm3 and then reacting the preheated metal fluoride with sulfuric acid at a temperature of about 100* to 500*C. The preheating is preferably effected in counterflow with hot combustion gases, the preheater either having alternating constricted and widened zones or allowing the fluorspar to be alternately suspended in and separated from the gas passing through the preheater. The sulfuric acid is conveniently added to the fluorspar at a plurality of points prior to entry into the main reactor. In addition, an alkaline substance such as calcium oxide or hydroxide which reacts exothermically with sulfuric acid may be added to the preheater or thereafter so as to provide additional heat for the main reaction. The sulfuric acid may contain sulfur trioxide or oleum, preferably in appropriate amount to react with the by-product water formed from the exothermic reaction of the calcium or hydroxide.

Abstract translation: 在通过硫酸和金属氟化物反应制备氟化氢和金属硫酸盐时，例如， 氟石，其中氟石被预热，其改进包括通过在约0.2至4kg / Nm 3的气体填充气体/固体悬浮液中连续加热金属氟化物至约500至800℃进行预热，然后使 在约100℃至500℃的温度下用硫酸预热的金属氟化物。预热优选与热燃烧气体逆流进行，预热器具有交替的收缩和加宽的区域，或允许荧光交替悬浮在 与通过预热器的气体分离。 在进入主反应器之前，硫酸在多个点方便地加入氟石中。 此外，可以将预先加热到硫酸等与碱发生反应的碱性物质如氧化钙或氢氧化物，以便为主反应提供额外的热量。 硫酸可以含有三氧化硫或发烟硫酸，优选适量地与由钙或氢氧化物的放热反应形成的副产物水反应。