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A kind of waste hydrochloric acid recovery process

A technology of waste hydrochloric acid and hydrochloric acid, applied in the direction of chlorine/hydrogen chloride purification, chlorine/hydrogen chloride, etc., can solve the problems of waste of resources and increase the cost of sewage treatment, and achieve the effect of avoiding waste and reducing the cost of treatment.

Active Publication Date: 2011-12-21
NANTONG STAR GRAPHITE EQUIP CO LTD
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Problems solved by technology

Causes a waste of resources while increasing the cost of sewage treatment

Method used

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  • A kind of waste hydrochloric acid recovery process
  • A kind of waste hydrochloric acid recovery process

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Embodiment Construction

[0008] The processing steps of this embodiment are:

[0009] First, preheat the waste hydrochloric acid: pass the waste hydrochloric acid into the flow channel of the hydrochloric acid preheater 1, and exchange heat with the high-temperature medium in another flow channel to realize temperature rise, and the temperature after preheating is 78-82°C;

[0010] Carry out the preparation of catalyst: catalyst is calcium chloride solution, and its configuration is mainly to prepare its concentration, concrete preparation is: put granular calcium chloride in calcium chloride preparation kettle 2 and fully stir and mix with condensed water, store in The dilute calcium chloride solution storage tank 3 has a concentration of 50%; the calcium chloride solution in the calcium chloride solution storage tank 3 is pumped into the flash separation tank 4, and flashed to it. The evaporation of water realizes the allocation of its concentration, and the prepared calcium chloride solution is col...

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Abstract

The invention relates to a recycling process of waste hydrochloric acid. The recycling process of waste hydrochloric acid is characterized in that: after being preheated, the waste hydrochloric acid is fully mixed with a prepared calcium chloride solution which is used as a catalyst; the mixture is fed into a hydrochloric acid desorption tower; the hydrochloric acid is resolved by a reboiler at the bottom of the hydrochloric acid desorption tower; after passing through a cooler and a demister, the separated hydrogen chloride gas is collected; the water with a small number of hydrogen chloridereturns to the hydrochloric acid desorption tower for continuous resolution; and the calcium chloride solution used as the catalyst is fed into a flash distillation stream dividing tank to be prepared and reused. The waste of hydrogen chloride is avoided, and sewage treatment cost is reduced.

Description

technical field [0001] The invention relates to a waste hydrochloric acid recovery process, in particular to a recovery process for extracting hydrogen chloride gas from waste hydrochloric acid by a physical separation method. Background technique [0002] In chemical production, waste hydrochloric acid is often produced. The waste acid contains impurities and cannot be recycled directly. It is usually directly discharged into the sewage pool for treatment. It causes a waste of resources and increases the cost of sewage treatment. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a recovery process for extracting hydrogen chloride gas from waste hydrochloric acid by physical separation. [0004] In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a waste hydrochloric acid recovery process, which is characterized in that: the process steps are: firstly, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07
Inventor 钱淑娟夏斌赵荣欣张进尧孙建军王俊飞
Owner NANTONG STAR GRAPHITE EQUIP CO LTD
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