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Complex solvent for separating benzene from sulfolane by means of extractive distillation and method for applying complex solvent

An extractive distillation and compound solvent technology, applied in distillation purification/separation, organic chemistry, etc., can solve problems such as system equipment corrosion, and achieve the effect of reducing consumption, reducing production cost and ensuring yield

Inactive Publication Date: 2018-03-09
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding water to the solvent will easily cause corrosion of the system equipment

Method used

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  • Complex solvent for separating benzene from sulfolane by means of extractive distillation and method for applying complex solvent
  • Complex solvent for separating benzene from sulfolane by means of extractive distillation and method for applying complex solvent
  • Complex solvent for separating benzene from sulfolane by means of extractive distillation and method for applying complex solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The C6 fraction is used as the raw material, the C6 fraction: composite solvent = 4: 1, the composite solvent is sulfolane: mixed xylene = 85%: 15%, the composite solvent and the C6 fraction are respectively fed into the extractive distillation tower in proportion The benzene product is separated by extraction and distillation. The operating conditions of the extraction distillation tower and the solvent recovery tower are shown in Table 1, and the separation results are shown in Table 2.

Embodiment 2

[0022] The C6 fraction is used as the raw material, the C6 fraction: composite solvent = 4: 1, the composite solvent is sulfolane: mixed xylene = 80%: 20%, the composite solvent and the C6 fraction are respectively fed into the extractive distillation tower in proportion The benzene product is separated by extraction and distillation. The operating conditions of the extraction distillation tower and the solvent recovery tower are shown in Table 1, and the separation results are shown in Table 2.

[0023] Table 1 Extractive distillation tower, solvent recovery tower operating conditions

[0024]

[0025]

[0026] Table 2 Separation results of non-aromatic and benzene products

[0027]

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Abstract

The invention discloses a complex solvent for separating benzene from sulfolane by means of extractive distillation. The complex solvent comprises 95-80 wt% of sulfolane and 5-20 wt% of co-solvent. The co-solvent is mixed xylene. The invention further relates to a method for applying the complex solvent. The complex solvent and the method have the advantages that the co-solvent comes from convenient and speedy sources, adding processes are simple and convenient, original co-solvents can be replaced, high-purity benzene products can be recycled from raw materials with high benzene contents, consumption of co-solvents can be reduced, accordingly, the production costs can be lowered, and the production and operation flexibility can be improved.

Description

technical field [0001] The invention relates to a solvent for sulfolane extraction, distillation and separation of benzene, in particular to a composite solvent for sulfolane extraction, distillation and separation of benzene, and simultaneously the invention also relates to a method for using the composite solvent. Background technique [0002] Aromatics are important organic chemical raw materials. Petroleum-based light aromatics mainly come from reformed oil from catalytic reforming units in refineries and pyrolysis gasoline from ethylene units. Azeotropes are formed, and pure aromatics cannot be obtained by simple distillation. Therefore, aromatics extraction technology came into being. According to the principle, its process route can be divided into two categories: liquid-liquid extraction and extraction-distillation. The former is suitable for separating benzene, toluene, xylene, etc. from wide fractions, and the latter is suitable for separating single aromatics with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/08C07C15/04
CPCC07C7/08C07C15/04
Inventor 周小群王龙廖定满王家华梁胜彪邓翠花刘国禹刘振宇孙望平谢正良
Owner CHINA PETROLEUM & CHEM CORP
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