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Pressure-relief discharge, absorption, treatment and recycling method in production process of thionyl chloride

A technology for thionyl chloride and production process, which is applied in the fields of pressure relief, exhaust, absorption and recycling in the production process of thionyl chloride, can solve problems such as unbalanced synthesis reaction and system pressure increase, and improve production efficiency , the effect of improving safety performance

Active Publication Date: 2014-10-22
JIANGXI SELON INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above-mentioned technical problems, the present invention uses a large sulfur monochloride tank to deal with the excessive single-phase gas, and the unbalanced synthesis reaction causes the system pressure to rise, and a vulcanization pool is set behind the sulfur monochloride large tank for Absorb and process the gas obtained from the sulfur monochloride large tank reaction, and pass through the diaphragm pump, and then go through drying treatment, and then send the treated sulfur dioxide gas into the meter to measure and enter the synthesis system

Method used

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  • Pressure-relief discharge, absorption, treatment and recycling method in production process of thionyl chloride
  • Pressure-relief discharge, absorption, treatment and recycling method in production process of thionyl chloride

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Experimental program
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Effect test

Embodiment 1

[0023] When the reaction just started, add the sulfur monochloride liquid that liquid level is 60% in the sulfur dichloride synthesis kettle, pass into chlorine gas 106M 3 / h, feed sulfur dioxide into the mixer, the flow rate is 58M 3 / h, the flow ratio of chlorine and sulfur dioxide is 1.83, when the system pressure is 0.16MPa, the sulfur monochloride tank is opened, the gas in the separator and rectification tower is discharged into the sulfur monochloride tank, and the system pressure is at After an instant rise, it begins to fall. After 3 minutes, the system pressure drops to 0.13MPa, the inlet end of the sulfur monochloride tank is automatically closed, and the gas enters the buffer tank through the diaphragm pump. Two hours after the reaction started, the pressure in the buffer tank was 0.25MPa, and the sulfur dioxide content was measured as 99.3% after the sample was taken out and dried.

Embodiment 2

[0025] Six hours after the reaction started, when the gas pressure in the buffer tank reached 0.25MPa, it was detected that the purity of the dried sulfur dioxide was 99.0%, and the gas in the buffer tank was released. When the sulfur monochloride tank was closed, the diaphragm pump did not work When, open the exhaust valve on the large tank of sulfur monochloride, and close after this process lasts one minute.

Embodiment 3

[0027] Ten hours after the reaction started, the gas pressure in the buffer tank reached 0.25 MPa again, and the purity of the dried sulfur dioxide was 99.4%.

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Abstract

The invention relates to a pressure-relief discharge, absorption, treatment and recycling method in production process of thionyl chloride. During the synthesis process of thionyl chloride, due to the specificity of reaction process, the unbalanced reaction of single-phase gas excessive sulfoxide is inevitably generated to cause the pressure increase situations of the system. The method comprises the following steps: (1) accelerating the gas flow by properly discharging condensed non-condensable gas to a sulfur monochloride tank; (2) absorbing chlorine gas in the gas discharged into the tank by use of sulfur monochloride, and then vulcanizing to leave sulfur dioxide gas and tiny inert gas; (3) quantitatively discharging inert gas in the sulfur monochloride tank into tail gas and carrying out absorption treatment so as to prevent excessive inert gas from causing the pressure increase of the system; (4) delivering the remaining sulfur dioxide gas to a buffer tank and metering so as to flow in the system for recycling, so that the synthesis reaction can return to a steady state. By virtue of the method, the purposes of improving the safety and high-efficiency production of a synthesis device can be achieved.

Description

technical field [0001] The invention relates to a pressure relief exhaust, absorption and recycling method in the production process of thionyl chloride. Background technique: [0002] Thionyl chloride is an intermediate raw material for the synthesis of pesticides, medicines, photosensitive materials and polymer intermediates. In the prior art, there are more than a dozen methods for synthesizing thionyl chloride, but there are basically three processes for large-scale industrial production , Phosphorus pentachloride method, chlorosulfonic acid method and gas phase synthesis method. Among these methods, the gas-phase synthesis of sulfur dioxide is widely used due to its simple process, low investment and high product purity, which is produced by a closed internal circulation device and has no environmental pollution. The basic reaction formula is as follows: [0003] [0004] Our previous Chinese patent No. CN100480174C discloses a gas-phase circulation method in the g...

Claims

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Application Information

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IPC IPC(8): C01B17/45
Inventor 汪国清汪新泉王寿发潘英曙戴恒文郑小辉
Owner JIANGXI SELON INDAL
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