Diluted hydrochloric acid dechlorination and concentration system

Abstract

The invention discloses a diluted hydrochloric acid dechlorination and concentration system. The system comprises a diluted hydrochloric acid evaporation tower, the diluted hydrochloric acid evaporation tower is connected with a diluted hydrochloric acid liquid inlet pipe, the bottom of the diluted hydrochloric acid evaporation tower is connected with an evaporation tower reboiler and a vacuum concentration tower, the top of the evaporation tower reboiler is connected to the bottom of the diluted hydrochloric acid evaporation tower, and an air inlet of the evaporation tower reboiler is connected with a high-temperature steam conduit. A liquid outlet at the bottom of the vacuum concentration tower is respectively connected to a concentration tower reboiler and a concentrated hydrochloric acid discharge pipe, a liquid outlet in the top end of the concentration tower reboiler is connected to a circulating inlet in the bottom of the vacuum concentration tower, an air inlet of the concentration tower reboiler is connected with the dilute hydrochloric acid evaporation tower, an exhaust port in the top of the vacuum concentration tower is connected with a steam condenser, an exhaust portof the steam condenser is connected with a vacuum pump, and the vacuum pump is connected with a chlorine-containing non-condensable gas exhaust pipe. The system disclosed by the invention has the characteristic of capability of simultaneously realizing dilute hydrochloric acid concentration and dechlorination, and also has the characteristics of low energy consumption, good dechlorination effect,low operation and investment cost and environment-friendly operation.

Description

technical field [0001] The invention relates to a dilute hydrochloric acid concentration system, in particular to a dilute hydrochloric acid dechlorination concentration system. Background technique [0002] As a commonly used chemical product and pickling agent, hydrochloric acid is widely used in chemical production and pickling production of steel structural parts. These processes will discharge a large amount of low-concentration waste hydrochloric acid. Discharge after treatment to neutrality, this treatment method is expensive, and will cause waste of resources and secondary pollution. [0003] Recycling waste hydrochloric acid is an important means to solve the high processing cost of waste hydrochloric acid, waste of resources and environmental pollution. It is a good way to return the HCL in dilute hydrochloric acid to PVC factory to produce VCM. However, this kind of When the use of waste hydrochloric acid is actually implemented, dilute hydrochloric acid needs to...

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Problems solved by technology

[0002] As a commonly used chemical product and pickling agent, hydrochloric acid is widely used in chemical production and pickling production of steel structural parts. These processes will discharge a large amount of low-concentration waste hydrochloric acid. Discharge after treatment to neutrality, this treatment method is expensive, and will cause waste of resources and secondary pollution

[0003] Recycling waste hydrochloric acid is an important means to solve the high processing cost of waste hydrochloric acid, resource waste and environmental pollution. It is a good way to return the HCL in dilute hydrochloric acid to PVC factory to produce VCM. However, this kind of When the use of waste hydrochloric acid is actually implemented, dilute hydrochloric acid needs to be concentrated to a certain extent, and the most critical thing is to remove free chlorine, otherwise free chlorine and acetylene in the VCM conversion process will synthesize explosive by-product chloroacetylene, which will be used in the VCM process. pose a serious safety hazard

However, at present, the concentration process for dilute hydrochloric acid is relatively common, while the removal of free chlorine still lacks related technologies.

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