Chlorine-containing waste sulfuric acid dechlorinating device

Abstract

The invention provides a chlorine-containing waste sulfuric acid dechlorinating device which comprises a separation tower and a separation kettle, wherein an exhaust opening, an acid inlet, a compressed air inlet and a liquid outlet are formed in the separation tower; a packing area is further formed in the separation tower; a liquid inlet is formed in the upper end of the separation kettle; a circulating opening is formed in the bottom of the separation kettle; a stirring assembly is further arranged on the separation kettle; a rotating shaft of the stirring assembly extends into the separation kettle; a stirring impeller is fixedly mounted on the rotating shaft; the separation tower is hermitically fixed on the upper side of the separation kettle; the liquid inlet of the separation kettle is aligned to the liquid outlet of the separation tower; the exhaust opening is communicated with an external absorption pool to form a collection channel for collecting chlorine; the circulating opening is communicated with the acid inlet in the separation tower through an external centrifugal pump to form a conveying channel for circulating and filtering the chlorine; the circulating opening is communicated with an external waste acid collection tank through the external centrifugal pump to form a finished product channel for conveying and completely filtering waste acid. The chlorine-containing waste sulfuric acid dechlorinating device has the benefits of low manufacturing cost, stable operation, low operation cost and capability of realizing effective removal of free chlorine.

Description

technical field [0001] The invention relates to a dechlorination device for chlorine-containing waste sulfuric acid. Background technique [0002] In the process of drying chlorine gas in the post-treatment process of caustic soda production, 98% concentrated sulfuric acid is used as a desiccant to absorb moisture and reduce the concentration to form waste sulfuric acid, while a small amount of chlorine gas is absorbed into the sulfuric acid solution. The concentration of waste sulfuric acid is 78-82%, and the chlorine content is about 1000-2000PPm in terms of free chlorine. In order to better realize the recycling of waste acid, it is necessary to remove free chlorine, and dechlorination equipment is the key to realize the dechlorination of waste sulfuric acid. [0003] At present, the following equipments are mainly used for dechlorination of chlorine-containing waste sulfuric acid: 1) Vacuum high-temperature distillation system is used to remove free chlorine in sulfuric...

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Problems solved by technology

[0004] However, the treatment methods of the above several equipments have the following problems: 1) Although the vacuum high-temperature distillation system can remove free chlorine therein, there are many equipments and complex systems, and some special corrosion-resistant materials are needed, such as rare metals such as tantalum materials , high equipment investment; the recovery system operates under high temperature and high vacuum, and the corrosion of sulfuric acid and free chlorine gradually increases with the increase of temperature, making it difficult to run stably; at the same time, it needs to be heated by medium-pressure steam, which consumes a lot of energy and lacks economy.

2) A simple blowing and supporting device is used for the dechlorination kettle, the equipment investment is small, but the removal efficiency is low, free chlorine cannot be effectively removed, and the waste acid after blowing off has a high free chlorine content, which cannot achieve the purpose of separation

[0005] With the expansion of the scale of caustic soda, in order to save production costs and reduce environmental pollution, it is imperative to dechlorinate and recycle waste chlorine-containing sulfuric acid. How to avoid high investment, high operating costs and poor separation effects of dechlorination equipment is a problem. must be resolved

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