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Liquid sulfur trioxide and method for producing high concentration fuming sulfuric acid

A liquid sulfur trioxide and fuming sulfuric acid technology, applied in the direction of sulfur trioxide/sulfuric acid, etc., can solve the problems of inconvenient product quality control, achieve uniform temperature difference, reduce production costs, and improve evaporation efficiency

Inactive Publication Date: 2009-03-11
湖北鑫慧化工有限公司
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Problems solved by technology

The production of high-concentration 65% oleum is absorbed through the absorption tower, which is not convenient for product quality control, and the tail gas after absorption needs further treatment

Method used

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  • Liquid sulfur trioxide and method for producing high concentration fuming sulfuric acid

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Embodiment Construction

[0017] The first step, as the raw material acid, sends 25% to 30% oleum in the sulfuric acid production system into the oleum preheater 2 through the circulation tank 1, and desorbs the SO outflow from the sulfur trioxide evaporator. 3 Heat exchange with 12% fuming sulfuric acid (back to acid) with a residual temperature of 106°C after the gas, preheat 25% to 30% fuming sulfuric acid to 100°C, then enter heater 3, and heat from sulfur trioxide evaporator 4 After the fuming sulfuric acid, the reformer gas whose temperature drops to 170°C-180°C is further heat-exchanged, and the temperature of 25%-30% fuming sulfuric acid is raised to 120°C and then sent to the sulfur trioxide evaporator 4, where the sulfur trioxide evaporator 4 is heated by the reformer gas from the sulfuric acid system, and the SO in 25% to 30% oleum is 3 Desorb it out to get 100% sulfur trioxide gas.

[0018] The second step is to send the reformer gas from the reforming system to the sulfur trioxide evapora...

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Abstract

The invention relates to a method for producing liquid sulfur trioxide and high-concentration oleum, which belongs to the technical field of inorganic chemical industry. The method is to preheat a 25 to 30 percent oleum directly through a preheater, heat the oleum in a heater, evaporate the loeum in an evaporator so as to improve the evaporation efficiency; the evaporator is heated by converter gas of a sulphuric acid system, thereby saving the vapor used by the SO3, and reducing the production cost; and the heating side of the evaporator does not generate condensate liquid, but has even temperature difference, thereby prolonging the service life of the evaporator. Besides, the 65 percent high-concentration oleum is directly prepared from the 25 to 30 percent oleum and the liquid sulfur trioxide, does not need treating tail gas, and greatly simplifies the production process. The method solves the problems that the prior production method is to heat by vapor, so the production cost is high and the evaporator has short service life, and adopts an absorption tower for absorption during the production of 65 percent oleum, so the quality of the product is difficult to control and the tail gas after absorption needs further treatment.

Description

Technical field: [0001] The invention relates to a production method of liquid sulfur trioxide and high-concentration fuming sulfuric acid, which belongs to the technical field of inorganic chemical industry. Background technique: [0002] Liquid sulfur trioxide is mainly used as a sulfonating agent and is an intermediate product in the production of high-concentration fuming sulfuric acid and chlorosulfonic acid. At present, a large amount of sulfur trioxide is used in the manufacture of sodium alkylbenzene sulfonate, sulfonated lubricating oil to make white oil, and biopharmaceuticals. High-concentration fuming sulfuric acid is mainly used as a sulfonating agent for sulfonation reactions, smoke bombs, etc. [0003] The existing production method of sulfur trioxide is heating 25%~30% oleum, and the SO dissolved in 25%~30% oleum 3 Evaporation and desorption to produce gas SO 3 , liquid SO is obtained by indirect condensation with cooling water 3 . Absorb SO gas with 25%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/69
Inventor 陈烈权廖杰邓芝强柳景宏
Owner 湖北鑫慧化工有限公司
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