New process for preparing chlorosulfonic acid and equipment thereof

Abstract

The present invention is process and apparatus for preparing chlorosulfonic acid. The process includes the following steps: pre-treating high purity hydrogen chloride and excessive sulfur trioxide gas, and synthesizing in a synthesizing tower; absorbing the gaseous resultant with the sprayed liquid resultant and reacting to produce small drop as the coarse liquid chlorosulfonic acid product; further reacting the coarse liquid chlorosulfonic acid product with hydrogen chloride gas in a refining tower to operate product, and absorbing un-reacted gas to reach exhaust standard. The present invention has the advantages of high product converting rate, small size of cooler, compact structure of synthesizing tower, high product purity, etc.

Description

technical field [0001] The present invention relates to the field of chemical product preparation, and is a new process and equipment for the preparation of chlorosulfonic acid, especially a chlorosulfonic acid preparation process for producing high-purity chlorosulfonic acid by using a synthesis tower to circulate spray and absorb, which has extremely The high conversion rate basically achieves zero emission of tail gas. Background technique [0002] The raw materials for the synthesis of chlorosulfonic acid are hydrogen chloride gas and sulfur trioxide gas. For domestic chlorosulfonic acid manufacturers, the synthesis process of chlorosulfonic acid has not changed much. Patent No. ZL97112819.7 discloses a scheme for the preparation of chlorosulfonic acid by the high gas concentration method which is widely used, in which the preparation of pure sulfur trioxide gas is provided, and the raw material gas of low concentration sulfur trioxide is cooled and sent to nicotinic aci...

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Problems solved by technology

[0004] But existing chlorosulfonic acid synthetic technique still has following shortcoming: 1, sulfur trioxide and hydrogen chloride mixed gas carry out gas-phase reaction at higher temperature, and the product that makes is gas chlorosulfonic acid, and this gas product is through cold discharge pipe Waiting for the external heat exchanger to condense to obtain liquid chlorosulfonic acid, and there are non-condensable gases such as chlorosulfonic acid and hydrogen that have not been fully absorbed in the tail gas, which poses a safety hazard; 2. Due to the existence of non-condensable gases, the tail gas treatment process is complicated. It will inevitably lead to an increase in energy consumption and raw materials, and the basic zero emission of tail gas cannot be achieved; 3. The residence time of the mixed gas in the synthesis tower is short, which affects the product conversion rate; 4. The external heat exchanger has a large footprint and is easy to corrode and other defects, the equipment occupies a large area, and the cooling gaseous chlorosulfonic acid uses a water-cooled condenser, which is large in size, so that the overall structure of the synthesis tower is not compact, and the floor area is large; 5, the synthesis reaction temperature in the synthesis tower is high, The reaction temperature in Patent No. ZL97112819.7 is 140-160°C, while that in Patent No. ZL02138609.9 indicates that the temperature is 150-230°C. A high reaction temperature will inevitably consume a lot of energy and be highly corrosive, which is not conducive to reducing costs and stabilizing production.

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