A kind of sulfolane purification and regeneration process

Abstract

The invention provides a purification regeneration technology of tetramethylene sulfone. The technology comprises a purification technology of tetramethylene sulfone and a regeneration technology of a resin bed. The purification technology of tetramethylene sulfone comprises outputting the tetramethylene sulfone to be purified from a stock solution tank of tetramethylene sulfone to a cool-heat-exchanger, performing constant temperature processing, sending the solution to a security filter. The regeneration technology of the resin bed comprises sending the tetramethylene sulfone entered the security filter to a shallow high-efficiency ion exchange resin bed, performing purification, sending the purified tetramethylene sulfone to a purified tetramethylene sulfone tank. The technology combines the purification technology of tetramethylene sulfone and the regeneration technology of the resin bed, and uses the shallow high-efficiency ion exchange resin bed to perform purification, so that the resin bed has fast regenerative speed, small device, and high utilization efficiency of the resin, is convenient to move, and needs little washing water. Moreover, the whole technology has strong dechlorination capability, high pH value, high processing efficiency and convenient operation.

Description

Technical field [0001] The invention belongs to the field of chemical product purification, and in particular relates to a purification and regeneration process for sulfolane. Background technique [0002] Because sulfolane solvent has high solubility for aromatics, good selectivity, good thermal stability, low vapor pressure, low toxicity and non-corrosion to carbon steel, the sulfolane extraction technology has become the most widely used in the world. Aromatics extraction technology. Compared with other aromatics extraction processes, this process has the advantages of low solvent ratio, high aromatics recovery rate, low energy consumption, low investment, and good economic benefits. However, sulfolane is prone to gradually deteriorate in industrial operation, which is a prominent problem that has always plagued aromatic extraction. Degraded sulfolane will cause serious corrosion of equipment, reducing the extraction capacity and increasing the amount of "three agents". [0003...

AI Technical Summary

Problems solved by technology

However, the existing sulfolane purification and regeneration process still has the following deficiencies: 1. Low dechlorination ability; 2. Low pH value; 3. Low treatment efficiency; 4. Large process equipment and large investment, which cannot be made into a movable skid-mounted device ; 5. Large amount and discharge of regenerant; 6. Inconvenient operation

[0004] Such as U.S. Patent No. 5,053,137A discloses a regeneration method for degraded sulfolane. In this method, sulfolane passes through a series of cation exchange resin columns and anion exchange resin columns in sequence, so that the properties of sulfolane are improved, but the speed of sulfolane passing through the resin column is extremely slow, making it The amount of sulfolane processed per unit time is limited, and the operation is very inconvenient

[0005] The patent publication number applied by China Academy of Petroleum and Chemical Sciences is CN1230545A about the regeneration method of inferior sulfolane. What adopts is to regenerate sulfolane with macroporous weak base anion exchange technology alone, but this technology has large process equipment, large investment, and many technological processes. It is difficult to install, occupies a large area, and the improvement of PH value is not obvious, the dechlorination effect is relatively weak, and there are also disadvantages such as large amount of regenerant and large discharge.

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