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Solvent composition for extracting distillation separation C5 and use thereof

A solvent composition and extractive distillation technology, which are applied in the field of extractive distillation and separation of C5 solvent compositions, can solve the problems of reducing production capacity, tray efficiency, large solvent ratio, etc., and save energy, material consumption, solvent The effect of reducing the ratio and reducing the amount of steam

Inactive Publication Date: 2009-06-24
PUYANG HENGRUN PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest weakness of extractive distillation is that the solvent ratio is large, and the large amount of solvent reduces the production capacity and tray efficiency of the tower, which offsets the effect of reducing the number of trays required due to the increase in relative volatility after adding solvents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A solvent composition for extracting and rectifying separation of C5, the composition is composed of the following raw materials in parts by weight: 95 parts of dimethylformamide (DMF) and 5 parts of sodium chloride.

[0014] Application of the solvent composition for extractive distillation and separation of C5 in the production of isoprene from extractive distillation and separation of C5.

Embodiment 2

[0016] The difference between this embodiment and Embodiment 1 is: a solvent composition for extractive distillation and separation of C5, which is composed of the following raw materials in parts by weight: 96 parts of dimethylformamide (DMF), chlorinated Sodium 4 parts.

Embodiment 3

[0018] The difference between this embodiment and Embodiment 1 is: a solvent composition for extractive distillation and separation of C5, which is composed of the following raw materials in parts by weight: 97 parts of dimethylformamide (DMF), chlorinated Sodium 3 parts.

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Abstract

The invention provides a solvent composition for extracting, rectifying and separating C5 and the application thereof. The composition is composed of the following raw materials according to the weight parts: 95-100 parts of dimethyl formamide (DMF) and 0.1-5 parts of inorganic sodium salt; the solvent composition for extracting, rectifying and separating C5 is applied to extracting, rectifying and separating C5 to produce isoprene. The solvent composition is composed of the dimethyl formamide (DMF) and the inorganic sodium salt which are mixed according to a certain proportion, thus achieving the purpose that the relative volatility is improved among C5 ingredients; by adopting the technical proposal, the producing capacity of a C5 finely classifying device is obviously improved, the production cost can be reduced and energy and material consumption is saved; under the same working condition and with the same number of column plates, by adopting the technical proposal, the solvent ratio is greatly reduced, the C5 charging amount and isoprene finished goods are obviously improved; meanwhile, the used steam amount is reduced.

Description

technical field [0001] The invention relates to a solvent composition for extracting, rectifying and separating carbon five and its application, belonging to the technical field of chemical industry. Background technique [0002] In the same industry, the most competitive method for separating C5 to produce isoprene is extractive distillation. The biggest weakness of extractive distillation is the large solvent ratio, which reduces the production capacity and tray efficiency of the tower, and offsets the effect of reducing the number of required trays due to the increase in relative volatility after adding solvents. Therefore, reducing the solvent ratio and improving the solvent separation ability have an important impact on the technical and economic indicators of the entire process. Currently commonly used solvents are: acetonitrile (ACN), N-methylpyrrolidone (NMP) and dimethylformamide (DMF). Among them, acetonitrile (ACN) and N-methylpyrrolidone (NMP) can increase the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/08C07C11/18B01D3/40
Inventor 尚拥军魏纯曹泽允杨德胜
Owner PUYANG HENGRUN PETROCHEM
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