Practical and safe process for producing liquid SO3 by using sulfuric acid system

Abstract

The invention discloses a practical and safe process for producing liquid SO3 by using a sulfuric acid system. The practical and safe process that 1, dry and hot flue gas passes through an SO3 evaporator to provide evaporation heat for the SO3 evaporator; 2, a fuming sulfuric acid liquid fully preheated and heated by a spiral plate type pre-heater is conveyed to the SO3 evaporator, the SO3 evaporator is heated to perform SO3 evaporation, the evaporated high-temperature fuming sulfuric acid liquid with reduced concentration passes through the spiral plate type pre-heater, and fully pre-heats to-be-evaporated concentrated fuming sulfuric acid, and the evaporated high-temperature fuming sulfuric acid liquid flows back to a fuming sulfuric acid circulating groove after being cooled; and 3, theSO3 evaporator is heated to evaporate the fuming sulfuric acid so as to separate pure SO3 gas, the pure SO3 gas is introduced into a double-row micro-slope leaching condenser, and is condensed into aSO3 liquid, and the SO3 liquid automatically flows into a liquid SO3 finished product storage tank to obtain the product. According to the invention, with the practical and safe process, the system heat utilization and cyclic utilization are fully and efficiently realized so as to substantially reduce the production cost, improve the reliability and the safety and effectively solve the problem ofinsufficient evaporation heat and the safe and efficient problem of the condenser.

Description

technical field [0001] The invention relates to the technical field of sulfuric acid production, in particular to a sulfuric acid system for producing liquid SO 3 Practical safety technology. Background technique [0002] Liquid SO 3 It is mainly used as a sulfonating agent and is an intermediate product in the preparation 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. SO 3 The liquid is highly volatile, easy to freeze, and cannot be exposed to water. It is a dangerous chemical. Therefore, production safety is very important. [0003] There are three main problems in the existing production methods: first, the heat required for evaporation is often insuff...

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Problems solved by technology

[0003] There are three main problems in the existing production methods: first, the heat required for evaporation is often insufficient, which affects evaporation and production, and some have to use about 0.8MPa steam for heating, and energy consumption also brings risks; second, the condensing capacity is limited. Constraints, the cooling water is too large or cold, it is easy to solidify and block the fault, and the treatment is very troublesome; the cooling water is small or hot, and the output is affected, SO 3 The gas is affected by the condensation speed, which limits the amount of gas entering the condenser. It cannot pass through directly and must be condensed; the third is the biggest problem is the efficient cooling and safety of the condenser. There is no good way, that is, if you want a high water cooling effect They are also afraid of terrible accidents caused by water leakage, so air cooling is often used for safety, and the efficiency is extremely low, especially in summer

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