Technology and equipment for continuous production of sulfur dioxide with low concentration oleum

Abstract

The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a process and equipment for continuously producing sulfur dioxide with low-concentration oleum. The process steps are as follows: 1) The gas phase of the 4th and 5th stage converters of the sulfuric acid production process is passed into the secondary absorption tower from the gas phase input pipeline for absorption, and the gas phase enters the external absorption system to continue the absorption, and the liquid phase obtained by absorption is Nicotinic sulfuric acid enters the circulation tank, and is continuously injected into the first-stage reaction tower through the mechanical pump A, and simultaneously feeds liquid sulfur to react, and always maintains the state of insufficient liquid sulfur; 2) the reaction solution produced in step 1) passes through The machine pump B is continuously pumped back into the circulation tank; 3) The mixed gas produced by the reaction in step 1) enters the lower part of the secondary reaction tower, and simultaneously feeds liquid sulfur to react to obtain sulfur dioxide gas. During the reaction process, the excess liquid sulfur is always kept state. The invention is simple and easy to implement, saves energy consumption, reduces production costs, improves product quality, has good safety performance and high degree of automation.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a process and equipment for continuously producing sulfur dioxide with low-concentration oleum. Background technique [0002] At present, the production process of sulfur dioxide is to prepare sulfur trioxide first, and then react sulfur trioxide with liquid sulfur to form sulfur dioxide. [0003] The production of sulfur trioxide is the production of sulfur dioxide by incineration in the sulfuric acid industry, and then catalytically converts it into sulfur trioxide through the 1st, 2nd, and 3rd stage converters. The sulfur trioxide is then absorbed by concentrated sulfuric acid into fuming sulfuric acid. After evaporation, liquid sulfur trioxide is produced. In the sulfur trioxide conversion part, most of the sulfur dioxide can be converted in the front, but some of them have not been converted, so the previous conversion part uses the concentra...

AI Technical Summary

Problems solved by technology

In the sulfur trioxide conversion part, most of the sulfur dioxide can be converted in the front, but some of them have not been converted, so the previous conversion part uses the concentrated sulfuric acid in the first-level nicotinic acid tower and the second-level nicotinic acid tower to absorb and convert it into high-concentration fuming acid , the gas phase enters the primary absorption tower for absorption, and the unabsorbed sulfur dioxide in the gas phase continues to enter the 4th and 5th stage converters to be converted into sulfur trioxide, and then absorbed into concentrated sulfuric acid through the secondary absorption tower. Concentrated sulfuric acid converts 98% acid, resulting in part of sulfur trioxide not recovered

[0004] The above process has the following problems: the process route is long, and the evaporation and storage of niacin not only brings large investment and high energy consumption, but also brings more potential safety hazards

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