Method for recycling sulfur dioxide and butadiene

Abstract

The invention discloses a method for recycling sulfur dioxide and butadiene, relates to a method for recycling the mixed gas of sulfur dioxide and butadiene generated in the process of producing 3-sulfolane, and is mainly used for solving the problem that the sulfur dioxide and butadiene are directly discharged during the production of 3-sulfolane. The method comprises the following steps of: filling a stirred tank for removing sulfur dioxide in the 3-sulfolane with nitrogen, wherein the pressure of nitrogen is 0.05MPa; discharging the 3-sulfolane, sulfur dioxide and butadiene liquid into the stirred tank for removing sulfur dioxide in the 3-sulfolane; introducing the mixed gas of the precipitated sulfur dioxide and butadiene into a compressor through a polymerization inhibitor tank for pressurizing; introducing the mixed gas into a condenser after pressurization for temperature reduction, then introducing the mixed gas into a sulfur dioxide and butadiene recycling and storage tank to be used as the production raw materials; introducing the mixed gas into the stirred tank for removing sulfur dioxide in the 3-sulfolane, the polymerization inhibitor tank, the compressor and the sulfur dioxide and butadiene recycling and storage tank by a pressure retaining valve; and finishing the process when the content of sulfur dioxide in the purge gas is less than 2000ppm. The method has the advantage of being environmentally-friendly.

Description

Technical field: [0001] The invention relates to a method for recovering and reusing sulfur dioxide and butadiene mixed gas produced in the process of producing sulfolene. Background technique: [0002] When using sulfur dioxide and butadiene to produce sulfolene, in order to completely react the butadiene, it is necessary to add excess sulfur dioxide, and the molar ratio of butadiene to sulfur dioxide is 1:1.15-1.20. At present, the excess sulfur dioxide discharged during the production process generally adopts the method of alkali absorption to neutralize the sulfur dioxide. The gas discharged during the production process also contains a certain amount of butadiene that has not participated in the reaction. Discharged into the atmosphere, the above method not only wastes resources, but also pollutes the environment. Invention content: [0003] The technical problem to be solved by the present invention is to provide a method capable of recovering sulfur dioxide and but...

AI Technical Summary

Problems solved by technology

At present, the excess sulfur dioxide discharged during the production process generally adopts the method of alkali absorption to neutralize the sulfur dioxide. The gas discharged during the production process also contains a certain amount of butadiene that has not participated in the reaction. Discharged into the atmosphere, the above method not only wastes resources, but also pollutes the environment