Device for absorbing hydrogen chloride in hydrogen chloride catalytic oxidation chlorine production process gas

Abstract

The invention discloses a device for absorbing hydrogen chloride in a hydrogen chloride catalytic oxidation chlorine production process gas. The device comprises a falling film absorber, a packing tower, a hydrochloric acid pump and a graphite heat exchanger, wherein a process gas inlet, a diluted acid inlet, a primary absorbed process gas outlet and a condensate outlet of the falling film absorber are made of tantalum; an absorbed water inlet, a primary absorbed process gas inlet, a secondary absorbed process gas outlet and a diluted acid outlet of the packing tower are made of tantalum; theupper sealing head of the falling film absorber, the lower sealing head of the falling film absorber, an upper packing tower absorber sealing head, a packing tower absorber cylinder and a lower packing tower absorber sealing head are made of steel lined organic silicon steeped impermeable graphite; a fixing tube plate, an absorption tube and a floating tube plate of the falling film absorber are made of organic silicon steeped impermeable graphite; the falling film absorber cylinder is made of stainless steel; the packing is ceramic plate corrugated or high-silicon ceramic packing. The deviceis capable of effectively absorbing hydrogen chloride in process gases and can be used for a long time as a part in contact with a corrosive liquid has a corrosion resistant function.

Description

technical field [0001] The invention relates to a hydrogen chloride absorption device. Background technique [0002] The hydrogen chloride catalytic oxidation chlorine production process gas contains hydrogen chloride, oxygen, chlorine, nitrogen, carbon dioxide and water, and its temperature is about 260-400 ° C, which is reduced to about 200-300 ° C after the primary cooling, and then absorbed by the falling film The absorption device composed of the absorber and the packed tower absorber forms hydrochloric acid with a concentration of 20-32% and a temperature of 25-60°C, which flows out through the condensate outlet. However, the hydrogen chloride in the process gas is absorbed to form highly corrosive liquid hydrochloric acid. Therefore, the The part of the absorption device that is in contact with the corrosive liquid hydrochloric acid must have anti-corrosion function. [0003] However, in the above absorption device, the concentration and temperature of the corrosive ...

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Problems solved by technology

[0003] However, in the above absorption device, the concentration and temperature of the corrosive liquid hydrochloric acid in each part are different, and the degree of corrosion is different. If a unified precious material is used, not only the effect is not good, but also the cost of the device will be increased.

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