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Extraction distillation solvent

A technology of extractive distillation and solvent, applied in the direction of extractive distillation, distillation purification/separation, organic chemistry, etc., can solve the problems of difficult separation, high product pH value, low volatility, etc., and achieve good technical effect of inhibiting styrene polymerization , the effect of easy separation

Active Publication Date: 2007-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to adopt extraction and rectification technology to reclaim pyrolysis gasoline C in the prior art 8 When there is styrene in the distillate, there are technical problems that the relative volatility of o-xylene and styrene is small and difficult to separate, and the pH value of the separated product is high or low when a single solvent is used. A new extraction and rectification solvent is provided

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] This example illustrates the determination of the relative volatility of the raw material mixture described in Comparative Example 1 by using a two-component mixed solvent proposed by the present invention as the solvent for extractive distillation. The determination method adopts HS-GC method. The basic principle is: at a certain temperature and pressure, assuming that the gas-liquid two-phase in the airtight container has reached equilibrium, an equal volume of supernatant gas is strictly taken each time to enter the gas chromatograph, and the gas phase peak area of ​​component i is A i , ignoring the non-ideality of the low-pressure gas phase, the activity coefficient γ of component i i =A i / (x i * A i 0 ), where x i is the mole fraction of component i, A i 0 is the gas phase peak area of ​​the pure component i. When there is a solvent, the relative volatility of o-xylene to styrene can be expressed as: where P 0 Indicates the saturated vapor pressure. ...

Embodiment 2

[0022] This example illustrates the determination of the relative volatility of the raw material mixture described in Comparative Example 1 by using a two-component mixed solvent proposed by the present invention as the solvent for extractive distillation. Experimental method is the same as embodiment 1. The weight ratio of the solvent to the raw material is 4, and the weight composition of the solvent is: 65% of N-methylpyrrolidone and 35% of sulfolane. The relative volatility of o-xylene to styrene is 1.72.

Embodiment 3

[0024] This example illustrates the determination of the relative volatility of the raw material mixture described in Comparative Example 1 by using a two-component mixed solvent proposed by the present invention as the solvent for extractive distillation. Experimental method is the same as embodiment 1. The weight ratio of the solvent to the raw material is 5, and the weight composition of the solvent is: 40% of N-methylpyrrolidone and 60% of sulfolane. The relative volatility of o-xylene to styrene is 1.67.

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Abstract

The invention relates to an abstraction distillation solvent, wherein it comprises sulphone compounds and nitrogen compounds to separate ortho-xylene and styrene, from steam cracking C8 fraction.

Description

technical field [0001] The invention relates to an extractive distillation solvent. Background technique [0002] Styrene is an important monomer for the production of polystyrene, ABS resin and SBS. According to investigation and analysis, the pyrolysis gasoline by-product of ethylene plant contains 4-6% (weight) styrene, and the potential content of styrene in the pyrolysis gasoline by-product of a set of 600,000 tons / year ethylene plant can reach 1.5-3.0% 10,000 tons / year. At present, the processing plan for pyrolysis gasoline in actual production is: separation of C 5 - and C 9 + distillate, remaining C 6 ~C 8 The distillate is hydrogenated in two stages, and then separated into C 8 Distillate, as raw material for p-xylene; separate C 6 ~C 7 , to produce benzene through dealkylation. If styrene is separated before the two-stage hydrogenation, not only can the economic benefits of the whole plant be greatly improved, but also a considerable amount of cheap styr...

Claims

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Application Information

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IPC IPC(8): B01D3/40C07C7/08C07C15/46
Inventor 肖剑陈秀宏钟禄平陈袆华杨伟
Owner CHINA PETROLEUM & CHEM CORP
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