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A kind of method for extracting phenolic substances from phenol-containing raw material oil

A technology of phenolic substances and raw oil, applied in the field of coal chemical industry, can solve the problem of high energy consumption of extractant recovery, achieve the effects of reduced extraction rate, mild conditions, and small dissolution loss

Active Publication Date: 2022-07-05
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problem of high energy consumption in the recovery of existing extractants, the invention provides a method for extracting phenolic substances from phenolic raw material oil, which comprises the following steps:

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  • A kind of method for extracting phenolic substances from phenol-containing raw material oil

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Embodiment 1

[0045] 241.99g of ammonia solution with a concentration of 10% and 40.13g of overhead oil with a distillation range of 70-180°C and a total phenolic content of 56.82% were added to a 500mL single-neck flask with stirring, and fully stirred for 30min under normal temperature and pressure. , after liquid separation, 29.76 g of dephenolized oil and 251.21 g of an extract phase rich in phenolic substances were obtained, and the extraction phase rich in phenolic substances was mixed and extracted with 41.8 g of overhead oil to obtain 252.64 g of secondary rich in phenols. The extract phase of the substance and 39.43g of dephenolized oil; the phenol-containing ammonia solution was placed in a 500ml flask with stirring, 42.13g of nonylphenol was added under normal temperature and pressure to carry out back extraction, and stirred for 20min to obtain 52.76g respectively. The back-extraction phase rich in phenolic substances and 238.93g of the ammonia-containing aqueous phase; the back-...

Embodiment 2

[0047] The ammonia solution with a concentration of 10% and the overhead oil with a distillation range of 70-180°C and a total phenolic content of 56.82% are sent into the extraction column to separate the raffinate phase of the dephenolized oil and the extraction phase rich in phenolic substances. The number is 3 levels, the volume ratio of the ammonia solution to the overhead oil is 6:1, the extraction at normal temperature and pressure, and the extraction yield is 72.67%; the obtained extraction phase rich in phenolic substances enters the back extraction tower for separation and ammonia-containing aqueous solution, the number of back-extraction stages is 5, the volume ratio of the back-extraction agent nonylphenol to the extraction phase rich in phenolic substances is 6:1, the back-extraction at normal temperature and pressure, and the back-extraction yield is 82.58% The back-extraction phase rich in phenolic substances enters the rectifying tower for separation to obtain a...

Embodiment 3

[0049] The ammonia solution with a concentration of 10% and the overhead oil with a distillation range of 70-180 ° C and a total phenolic content of 57.07% are sent into the extraction column to separate the dephenolized oil raffinate phase and the extraction phase rich in phenolic substances. The number is 4 levels, the volume ratio of ammonia solution to tower top oil is 6:1, extraction at normal temperature and pressure, and the extraction yield is 86.86%; the obtained extraction phase rich in phenolic substances enters the back extraction tower for separation to obtain back extraction phase and ammonia-containing aqueous solution, the number of extraction stages is 7, the back-extraction agent nonylphenol has a volume ratio of 4:1 to the extraction phase rich in phenolic substances, and the back-extraction is carried out at normal temperature and pressure, and the back-extraction yield is 93.84%; The back-extraction phase rich in phenolic substances enters the rectifying to...

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Abstract

The invention provides a method for extracting phenolic substances from phenol-containing raw material oil, which comprises the following steps: extraction: performing multi-stage countercurrent extraction on phenol-containing raw material oil with an aqueous solution of ammonia or organic amine as an extractant to obtain an extraction phase A and raffinate phase B; back extraction: use nonylphenol or high-boiling phenol with a molecular weight greater than trimethylphenol in coal tar as a back extraction agent to carry out multi-stage countercurrent back extraction on the extraction phase A to obtain an aqueous phase C containing an extraction agent and the back-extraction phase D rich in phenolic substances; regeneration of the extractant: add the back-extraction phase D rich in phenolic substances into the extraction agent recovery tower, and after separation by rectification, the top of the tower obtains the water-containing extraction agent E, The tower still liquid is crude phenol oil F, and the water-containing extractant E is mixed with the extractant-containing water phase C and returned to the extraction step for recycling; refining and regeneration of the stripping agent; the crude oil F is obtained through multiple distillation and separation Stripping agent G and phenolic substances, stripping agent G is returned to the stripping step for recycling.

Description

technical field [0001] The invention relates to the field of coal chemical industry, in particular to a method for extracting phenolic substances from phenol-containing raw material oil. Background technique [0002] The raw oil contains abundant and considerable phenolic substances. The content and composition of phenolic substances produced by different chemical processes are quite different, but low-boiling phenol, phenol, naphthol and alkyl naphthol are the main components. part. According to the different properties of phenolic substances, a variety of methods for extracting phenolic compounds from raw oil have been explored, mainly including chemical method, selective solvent method, supercritical extraction method and pressure crystallization method. Among them, chemical methods are widely used. Patents CN104845662A, CN102731262A, US4256568A, US4595489A, etc. all involve chemical methods, but all chemical methods require the use of acid and alkali, which have strong ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/72C07C39/04C07C39/07
Inventor 艾秋红黄晓平罗和安黄荣辉
Owner XIANGTAN UNIV
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