Method for continuous generation of SO3 gas

Abstract

The invention provides a method for continuous generation of SO3 gas, belonging to the technical field of sulfonation. The method comprises the following steps: subjecting SO2 gas to acid pickling andthen allowing the pickled SO2 gas to enter a buffer tank under the control of a mass flowmeter; drying air, metering the dried air with the mass flowmeter, and then allowing the air to enter the buffer tank for mixing with the SO2 gas; allowing a gas mixture obtained in the previous step to enter a reactor filled with a catalyst and controlling a certain reaction temperature; and discharging generated SO3 gas from a discharging pipe, wherein SO3 gas with stable flow and concentration can be obtained by controlling the feed amounts of the SO2 and air. The method is mainly used for providing raw SO3 gas for bench-scale or pilot-scale sulfonation in a laboratory and has the advantages of safety, stability, environmental friendliness, accuracy, controllability, low investment, etc.

Description

technical field

[0001] The invention relates to a continuous production of SO 3 Gas method, especially related to a method using SO 2 Gas oxidation continuously produces stable flow and concentration of SO 3 The gas method belongs to the technical field of sulfonation. Background technique

[0002] Commonly used sulfonating agents in industry are concentrated sulfuric acid, oleum, chlorosulfonic acid and (liquid or gas) SO 3 Wait. Different sulfonating agents have significantly different effects on the sulfonation reaction speed and product quality. Concentrated sulfuric acid is the easiest sulfonating agent to use, but its sulfonating activity is limited, and it is difficult to sulfonate with inert organic reactants; when oleum is used as sulfonating agent, a sulfonic acid group is introduced and 1mol Water, with the reduction of sulfuric acid concentration, the sulfonation reaction rate drops sharply, and when the concentration of sulfuric acid reaches the concentrati...

Examples

Embodiment 1

[0019] Such as Figure 1 As shown, control the needle regulating valve to make 0.1L / minSO 2 The gas is metered into the 2L buffer tank through the rotameter, and at the same time, the 1L / min air is controlled by the gas mass flow meter to enter the buffer tank, SO 2 The gas and air are mixed in the buffer tank, then washed in concentrated sulfuric acid, and then enter the reactor after passing through the stop valve and rotameter. The reactor is filled with vanadium pentoxide catalyst, the particle size is 5mm, and the filling volume is 0.3 L, both ends are fixed with stainless steel mesh, and the reaction temperature is controlled at 500 o C, obtained SO 3 The gas flow rate is 0.092L / min, and the concentration is 9.1%.

Embodiment 2

[0021] Such as Figure 1 As shown, control the needle regulating valve to make 0.8L / min SO 2 The gas is metered into the 9L buffer tank through the rotameter, and at the same time, the 6L / min air is controlled by the gas mass flow meter to enter the buffer tank, SO 2 After the gas and air are mixed in the buffer tank, they are washed in concentrated sulfuric acid, and then enter the reactor after passing through the stop valve and rotameter. The reactor is filled with vanadium pentoxide catalyst, the particle size is 7mm, and the filling volume is 1L , both ends are fixed with stainless steel mesh, and the reaction temperature is controlled at 520 o C, obtained SO 3 The gas flow rate is 0.63L / min, and the concentration is 10.2%.

Embodiment 3

[0023] Such as Figure 1 As shown, control the needle regulating valve to make 0.2L / min SO 2 The gas is metered into the 4L buffer tank through the rotameter, and at the same time the air is controlled to enter the buffer tank at 1L / min through the gas mass flow meter, SO 2 The gas and air are mixed in the buffer tank, then washed in concentrated sulfuric acid, and then enter the reactor after passing through the stop valve and rotameter. The reactor is filled with vanadium pentoxide catalyst, the particle size is 4mm, and the filling volume is 0.03 L, both ends are fixed with a stainless steel screen, and the reaction temperature is controlled at 550 o C, obtained SO 3 The gas flow rate is 0.18L / min, and the concentration is 17.6%.

technical field

[0001] The invention relates to a continuous production of SO 3 Gas method, especially related to a method using SO 2 Gas oxidation continuously produces stable flow and concentration of SO 3 The gas method belongs to the technical field of sulfonation. Background technique

[0002] Commonly used sulfonating agents in industry are concentrated sulfuric acid, oleum, chlorosulfonic acid and (liquid or gas) SO 3 Wait. Different sulfonating agents have significantly different effects on the sulfonation reaction speed and product quality. Concentrated sulfuric acid is the easiest sulfonating agent to use, but its sulfonating activity is limited, and it is difficult to sulfonate with inert organic reactants; when oleum is used as sulfonating agent, a sulfonic acid group is introduced and 1mol Water, with the reduction of sulfuric acid concentration, the sulfonation reaction rate drops sharply, and when the concentration of sulfuric acid reaches the concentrati...

Examples

Embodiment 1

[0019] Such as Figure 1 As shown, control the needle regulating valve to make 0.1L / minSO 2 The gas is metered into the 2L buffer tank through the rotameter, and at the same time, the 1L / min air is controlled by the gas mass flow meter to enter the buffer tank, SO 2 The gas and air are mixed in the buffer tank, then washed in concentrated sulfuric acid, and then enter the reactor after passing through the stop valve and rotameter. The reactor is filled with vanadium pentoxide catalyst, the particle size is 5mm, and the filling volume is 0.3 L, both ends are fixed with stainless steel mesh, and the reaction temperature is controlled at 500 o C, obtained SO 3 The gas flow rate is 0.092L / min, and the concentration is 9.1%.

Embodiment 2

[0021] Such as Figure 1 As shown, control the needle regulating valve to make 0.8L / min SO 2 The gas is metered into the 9L buffer tank through the rotameter, and at the same time, the 6L / min air is controlled by the gas mass flow meter to enter the buffer tank, SO 2 After the gas and air are mixed in the buffer tank, they are washed in concentrated sulfuric acid, and then enter the reactor after passing through the stop valve and rotameter. The reactor is filled with vanadium pentoxide catalyst, the particle size is 7mm, and the filling volume is 1L , both ends are fixed with stainless steel mesh, and the reaction temperature is controlled at 520 o C, obtained SO 3 The gas flow rate is 0.63L / min, and the concentration is 10.2%.

Embodiment 3

[0023] Such as Figure 1 As shown, control the needle regulating valve to make 0.2L / min SO 2 The gas is metered into the 4L buffer tank through the rotameter, and at the same time the air is controlled to enter the buffer tank at 1L / min through the gas mass flow meter, SO 2 The gas and air are mixed in the buffer tank, then washed in concentrated sulfuric acid, and then enter the reactor after passing through the stop valve and rotameter. The reactor is filled with vanadium pentoxide catalyst, the particle size is 4mm, and the filling volume is 0.03 L, both ends are fixed with a stainless steel screen, and the reaction temperature is controlled at 550 o C, obtained SO 3 The gas flow rate is 0.18L / min, and the concentration is 17.6%.

Images