C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/180
C01B 7/19 (2006.01)
Patent
CA 1073183
Rayer 2899-LH PURIFYING HYDROFLUORIC ACID Abstract of the Disclosure In the production of highly pure concentrated hydrofluoric acid by purifying crude HF gases obtained in the reaction of fluorite and sulphuric acid in at least two preliminary H2S04 washing stages, followed by an HF-wash, water coolers, at least two brine coolers and an H2SO4 residual gas wash, through which there is passed the entire quantity of sulphuric acid required for reaction with the fluorite, including a quantity of oleum additionally used for ad- justing the H2SO4 concentration,the improvement which comprises introducing into the two preliminary H2SO4 washing circuits the H2SO4 previously employed for the residual gas wash together with part of the quantity of oleum required for adjusting the charging acid concentration in such proportions that the water content in each of the two washing circuits is kept in the range of about 6 to 10% by weight. Advantageously, about 50% of the total quantity of sulphuric acid used is introduced into the washing circuits of each of the two preliminary sulphuric acid washers, and the water content in the washing circuits is adjusted by regulating the pro- portion introduced into the first H2SO4 washing circuit of the quantity of oleum required for adjusting the charging acid. The rate of acid addition and concentration are substantially constant but may be periodically adjusted to keep the water contents in the washing stages at the desired levels.
262436
Schabacher Werner
Spreckelmeyer Bernhard
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