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Method for decomposing phenol sodium salt by using carbon dioxide

A carbon dioxide, sodium phenolate technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of low content of phenol and its congeners, and achieve the effect of increasing treatment costs and preventing excessive water addition.

Active Publication Date: 2019-03-29
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved in the present invention is to overcome the problem that the content of phenol and its homologues in the crude phenol product of the prior art is not high, thereby providing a kind of phenol sodium salt decomposition rate height, phenol and its homologue in the crude phenol product New method to decompose sodium phenolate salts with high levels of carbon dioxide

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a method for utilizing carbon dioxide to decompose sodium phenolate, including, once decomposed, an aqueous solution of sodium phenate salt and carbon dioxide gas containing 15% by volume for a countercurrent contact reaction, and then separate and obtain primary crude phenol and hydrogencarbonate containing The primary water phase of sodium, the pH value of the primary water phase is 7;

[0023] For secondary decomposition, the primary crude phenol and water are mixed according to the volume ratio of 1:0.3, and the obtained mixed solution is subjected to countercurrent contact reaction with carbon dioxide gas containing 15% by volume, and then separated to obtain the crude phenol product and the carbonic acid containing The secondary aqueous phase of sodium hydrogen, the pH value of the secondary aqueous phase is 7.

[0024] Heating the primary water phase and the secondary water phase to separate and obtain sodium carbonate solution, water and...

Embodiment 2

[0029] Utilize carbon dioxide to decompose phenolic sodium salt according to the method identical with embodiment 1, difference is that the volume percent of carbon dioxide is 58% in the gas that is used for primary decomposition and secondary decomposition, and the pH value of described primary aqueous phase after primary decomposition is 10 , during the secondary decomposition, the primary crude phenol and water are mixed according to the volume ratio of 1:1.5, and the obtained secondary water phase has a pH value of 9.

[0030] With this method, the decomposition rate of sodium phenolate is 99%, and the content (anhydrous base) of phenol and homologues in the crude phenol product is 91%.

Embodiment 3

[0032] The present embodiment provides a kind of method utilizing carbon dioxide to decompose sodium phenate, comprising,

[0033] Primary decomposition, the phenolic sodium salt solution enters the top of the primary decomposition tower, sprays from top to bottom, and carries out countercurrent contact reaction with the carbon dioxide gas with a volume percentage of 99% entering the bottom of the tower. Flow out, enter in the separatory tank, separate and obtain primary crude phenol and the primary water phase containing sodium bicarbonate, the pH value of the primary water phase is 9;

[0034] For secondary decomposition, the primary crude phenol is mixed with water according to a volume ratio of 1:1.0, and the obtained mixed solution enters the top of the secondary decomposition tower and is sprayed from top to bottom, and the content by volume that enters at the bottom of the tower is 99% of carbon dioxide gas is subjected to countercurrent contact reaction, and the materi...

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Abstract

The present invention provides a method for decomposing phenol sodium salt by using carbon dioxide. The method includes a primary decomposition step, namely a step of subjecting an aqueous solution ofthe phenol sodium salt and gas containing carbon dioxide to a countercurrent contact reaction, and then performing separation to obtain primary crude phenol and a primary water phase containing sodium bicarbonate; a secondary decomposition step, namely a step of subjecting a mixture obtained by mixing the primary crude phenol and water and gas containing carbon dioxide to a countercurrent contactreaction, and then performing separation to obtain a crude phenol product and a secondary water phase containing sodium bicarbonate. Through generating the water phase containing sodium bicarbonate,controlling the pH value of the water phase and mixing the primary crude phenol and water for secondary decomposition, a higher phenol sodium salt decomposition rate and a high crude phenol content can be achieved.

Description

technical field [0001] The invention relates to the fields of coal chemical industry and tar processing, in particular to a method for decomposing sodium phenolate by using carbon dioxide. Background technique [0002] Phenolic compounds are rich in high, medium and low temperature coal tar, biomass tar, coal gasification tar, and phenol oil fractions of direct or indirect coal liquefaction, and have a wide range of application values. These phenols can be converted into phenol sodium salt solution by washing phenol oil with alkali, and then decomposed by sulfuric acid method or carbon dioxide method to obtain crude phenol. The traditional sulfuric acid decomposition method utilizes sulfuric acid to decompose the sodium phenol salt. Due to the strong acidity of sulfuric acid, the sodium phenol salt can be decomposed well, and the obtained crude phenol has a high yield and good quality. However, for every 1 ton of crude phenol produced by this method, at least 3.5 tons of so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/055C07C39/04C07C39/06C07C39/00
CPCC07C37/055C07C39/04C07C39/06C07C39/00
Inventor 熊杰明韩世琳黄龙郭立新
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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