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1. The lean solvent sulfolane processing amount were larger than 300per mass of the anion-exchange resin.

2. A method for extraction of aromatic hydrocarbon using sulfolane as solvent is described.

3. A vacuum distillation column relates to a sulfolane distillation device in equipment for producing sulfolane.

4. A new viewpoint on deterioration mechanism of sulfolane was proposed after analyzing the used sulfolane in aromatics extraction and the fouling deposits on equipment.

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5. Because there is sulfolane, water and steam in the feed of EA-303 vertical heat exchanger, which resulted in tube problems occurred frequently.

6. This paper proposes an equilibrium solubility calculation model for H_2S and CO_2 in aqueous methyldiethanolamine solution and aqueous methyldiethanolamine sulfolane solutions.

7. It is dissolved in many kinds of dipolar aprotic organic solvents such as NMP, DMAc, DMSO, sulfolane.

8. The aromatics extraction principles and process outlines, the features of sulfolane and the measures on protection of sulfolane from oxidization and degradation were discussed in this paper.

9. Foaming in the stripper is the main problem that affects the smooth running and capacity of a sulfolane extraction unit, therefore, anti foaming agent is usually used to suppress foaming.

10. Some acid corrosion matters and high polymer produced by sulfolane degradation in hydrocarbon extraction may corrode equipment and jam the heat exchanger.

11. It is hopeful that this work will arouse the attention of the people working in sulfolane extraction process so as to take measures to curb this problem.

12. This study was based on the existing production unit with hydrotreated naphtha and the C6-C7 fraction of the reformate as feedstocks and sulfolane as solvent.