Regeneration method of extracting solvent for extracting, rectifying and separating styrene

An extractive distillation and extractive distillation tower technology, which is applied in the field of regeneration of solvents used for extractive distillation and separation of styrene, can solve the problems of poor performance, aggravated solvent deterioration, and inability to separate by distillation, and achieve styrene polymer The effect of reducing and stabilizing solvent performance

Active Publication Date: 2010-11-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Existing solvents used in extraction and rectification to separate styrene generally adopt decompression regeneration, water stripping regeneration or even no regeneration. There are many kinds of polymers of ethylene, among which the boiling poin

Method used

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  • Regeneration method of extracting solvent for extracting, rectifying and separating styrene
  • Regeneration method of extracting solvent for extracting, rectifying and separating styrene
  • Regeneration method of extracting solvent for extracting, rectifying and separating styrene

Examples

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Effect test

example 1

[0028] Take the composition as pyrolysis gasoline C shown in Table 1 8 distillate as raw material, according to figure 1 The flow process carries out extraction and rectification on the raw material, recovers the styrene in it, and purifies the poor solvent. The used extraction and rectification solvent contains 80% by mass of sulfolane and 20% by mass of dimethylacetamide, and the top of the solvent recovery tower uses water separated from the top material as the reflux liquid. Part of the poor solvent discharged from the bottom of the solvent recovery tower enters the upper part of the solvent purification tower 106, and the solvent purifier enters the solvent purification tower from the upper part, and the styrene polymer is separated from the poor solvent in the solvent purification tower to be purified. The purified poor solvent and water are heated and injected into the lower part of the solvent recovery tower 104 as stripping gas, and the styrene polymer enters the mid...

example 2

[0040] By the method of example 1 from pyrolysis gasoline C 8 Separation of styrene in the cut, the difference is that the extraction and rectification solvent used contains 70% by mass of triethylene glycol, 30% by mass of dimethylacetamide, using C 8 Aromatic hydrocarbon mixture is used as a solvent scavenger, and its composition is shown in Table 4. During extractive distillation operation, the mass ratio of the solvent scavenger and the lean solvent passed into the solvent purification tower 106 is 0.4: 1, and the water and lean solvent passed into the solvent purification tower 106 are The mass ratio of the solvent is 0.3:1, and the separation results and the running time of the device are shown in Table 5.

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Abstract

The invention provides a regeneration method of an extracting solvent for extracting, rectifying and separating styrene, comprising the following steps of: mixing water and a part of a lean solvent obtained by carrying out solvent recovery on extracted, rectified and separated styrene, and then introducing a mixture into the upper part of a solvent purification tower (106); enabling a solvent purifying agent to enter into the solvent purification tower (106) from the lower part; discharging the purified lean solvent containing water from a bottom pipeline of the solvent purification tower andthen introducing the purified lean solvent containing water into the lower part of a recovery tower for the extracted, rectified and separate styrene solvent, discharging a solvent purifying agent rich in a styrene polymer from the top of the solvent purifying tower, and introducing the solvent purifying agent rich in the styrene polymer into the middle of a solvent purifying agent recovery tower(107); discharging the solvent purifying agent subjected to styrene polymer removal from the top of the tower; and discharging the styrene polymer from the bottom of the solvent purifying agent recovery tower (107). The method can effectively remove the styrene polymer in the extracting solvent, ensure the performance of the extracting solvent and prolong the running time of a device for extracting, rectifying and separating styrene.

Description

technical field [0001] The present invention relates to a method for regenerating the extractive distillation solvent used to extract and rectify and separate unsaturated hydrocarbons from hydrocarbon mixtures, in particular to a regeneration method for the solvent used to extract and rectify and separate styrene from hydrocarbon mixtures . Background technique [0002] Styrene is an important basic organic chemical raw material, and it is also widely used in coatings, pesticides, and medicine. According to statistics, the steam pyrolysis gasoline by-product of ethylene cracking unit contains 3-5% by mass of styrene, and a set of 1 million tons / year ethylene plant contains about 20,000-30,000 styrene in pyrolysis gasoline due to the difference in raw materials. tons / year. In the existing process of dealing with pyrolysis gasoline, this part of styrene is converted into ethylbenzene by hydrogenation and stored in C 8 In the distillate, this ethylbenzene-rich C 8 The disti...

Claims

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Application Information

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IPC IPC(8): C07C7/08C07C15/46B01D3/40
Inventor 赵明田龙胜葸雷唐文成
Owner CHINA PETROLEUM & CHEM CORP
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