Concentrated sulfuric acid purification device and purification process applying same

Abstract

The invention provides a concentrated sulfuric acid purification device which is used for purifying concentrated sulfuric acid and comprises: a quartz glass assembly used for heating and boiling the concentrated sulfuric acid through electric heating, a raw material acid supply device used for supplying raw material acid to the quartz glass assembly and a cooling tank used for cooling acid liquorpurified by the quartz glass assembly. The quartz glass assembly is prepared from quartz glass, wherein the SiO2 content of the quartz glass assembly reaches 99.97% or above; the quartz glass assemblyis formed by welding through a full-closed field welding technology, the allowable working temperature is not lower than 1100 DEG C, and the linear expansion coefficient of the quartz glass assemblyat the temperature does not exceed 5.56*10<-7>. The concentrated sulfuric acid purification equipment is high in daily output, small in occupied area and low in power consumption, continuous production can be achieved, and the process yield can reach 95%; in addition, visual production is achieved, air pressure resistance and hot pressing performance are guaranteed, impact of force with a certainfrequency generated by the Karman vortex street effect is eliminated, and the service life of equipment is maintained.

Description

technical field [0001] The invention relates to the field of concentrated sulfuric acid purification, in particular to a concentrated sulfuric acid purification equipment, which is made of quartz glass and welded by fully enclosed on-site welding technology, and its SiO 2 The content reaches more than 99.97%, and also relates to a concentrated sulfuric acid purification process based on the purification equipment. Background technique [0002] Concentrated sulfuric acid, the chemical formula is H 2 SO 4 , is a highly corrosive strong mineral acid. Concentrated sulfuric acid has strong oxidizing properties when the concentration is high. This is one of the biggest differences between it and ordinary sulfuric acid or ordinary concentrated sulfuric acid. It also has dehydration and strong oxidizing properties. , strong corrosiveness, low volatility, acidity, water absorption, etc. In the existing sulfuric acid purification device, the sulfuric acid is heated by a heating eva...

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Problems solved by technology

[0004] Glass equipment has high corrosion resistance and thermal conductivity, and can be used as purification equipment, but the preparation of glass equipment for purifying concentrated sulfuric acid is complicated, the process is difficult to guarantee, and there are many grinding ports

There is unrelieved stress at the grinding mouth. In the continuous production process, under the combined action of internal pressure, heat pressure and pipe weight, the service life is short; in order to reduce the system load, the daily output of the existing concentrated sulfuric acid purification equipment for glass are at a lower level

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