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Reclamation method of sulfolane containing inorganic salt

A recovery method and technology for inorganic salts, applied in the field of recovery of sulfolane, can solve the problems of unsuitable removal of a large amount of inorganic salts, unsuitable for industrialization, etc., and achieve the effects of convenient operation, reduced moisture and high efficiency

Active Publication Date: 2008-10-15
DALIAN NETCHEM CHIRAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can be used for the adsorption of corrosive impurities and a small amount of solid inorganic salts, but it is also not suitable for removing a large amount of inorganic salts, and it is not suitable for industrialization
[0005] For the removal of a large amount of inorganic salts dissolved in sulfolane due to the reaction, so as to achieve the recovery and utilization of sulfolane, there is no special report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 60 grams of toluene to 100 grams of sulfolane containing 50 grams of dimethylamine hydrochloride, freeze to 0°C, and filter. The resulting filtrate is distilled under reduced pressure at -0.095MPa, 40°C to 90°C, and the toluene is distilled out to obtain the content 98%, water content <0.1%, salt content of sulfolane less than 1 g.

Embodiment 2

[0020] Add 120 grams of toluene to 100 grams of sulfolane containing 40 grams of dimethylamine hydrochloride at room temperature and filter. The resulting filtrate is distilled under reduced pressure at -0.095MPa and 40°C to 90°C. The toluene is distilled to yield 97%. Sulfolane with a water content of <0.1% and a salt content of less than 1 gram.

Embodiment 3

[0022] Add 60 g of n-hexane to 100 g of sulfolane containing 40 g of diisopropylamine sulfate at room temperature, freeze to 0°C, filter, and distill the filtrate under reduced pressure, -0.095MPa, and distill n-hexane at 40°C to 90°C. Sulfolane with a content of 98%, a water content of <0.1%, and a salt content of less than 1 g is obtained.

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PUM

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Abstract

The invention discloses a recycling disposing method of chemical solvent with inorganic cyclobutosulfone, which is characterized by the following: adding filter aid in the inorganic cyclobutosulfone to dissolve with filter under normal temperature; evolving large amount inorganic from cyclobutosulfone; filtering at -10-20 deg.c; decompressing filtrate; distilling the filter aid; removing inorganics from cyclobutosulfone; azeotroping water; recycling cyclobutosulfone.

Description

Technical field: [0001] The invention relates to a method for recovering chemical solvents, in particular to a method for recovering sulfolane. Background technique: [0002] High-purity sulfolane is a colorless and odorless solid at room temperature. It is an aprotic multi-effect polar solvent with strong dissolving ability and good selectivity. It has high stability to heat, acid and alkali, and is not easy to interact with acid, alkali, Diolefins, sulfur, alcohols, etc. react, and are not easy to decompose and polymerize below 240 degrees. In the traditional petroleum industry, sulfolane is often used to extract aromatics from petroleum reforming fractions. It can also be used as a purifier for natural gas, synthesis gas and other acid gases to remove hydrogen sulfide and carbon dioxide. It can be used as a solvent for polymer compounds such as polyacrylonitrile, acrylonitrile copolymer, polyvinyl fluoride, etc. Recently, since sulfolane has been found to have good salt solubi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D333/48
Inventor 唐义君李晓张学龙曹辉远石作武
Owner DALIAN NETCHEM CHIRAL TECH