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Method of improving fluidity of phenol tar

A technology of phenol tar and fluidity, which is applied in the field of separation of phenol tar, can solve the problems of affecting the quality of hydroquinone products, the unit consumption of phenol and the increase of production cost, and the increase of production cost, so as to inhibit the dehydration condensation reaction and reduce environmental pollution , the effect of improving fluidity

Active Publication Date: 2009-04-15
SHANGHAI HUAYI NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN1377940A adopts the addition of inert, high boiling point, good fluidity organic solvent to replace hydroquinone in the mixed material to achieve the purpose of improving the fluidity of phenol tar and recovering hydroquinone in phenol tar as much as possible, but the disadvantage is the introduction of The third component may affect the quality of hydroquinone products; in addition, when phenol tar is discharged, the loss of organic solvents, and the addition of separation equipment to recover organic solvents will increase production costs.
[0004] Hydroquinone is a high value-added chemical intermediate, and a large amount of residues of hydroquinone products in tar will lead to an increase in the unit consumption of phenol and production costs

Method used

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  • Method of improving fluidity of phenol tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mass composition of the phenol hydroxylation reaction liquid to be separated is: water content 37.5%, phenol content 53.5%, catechol content 5%, hydroquinone content 2.5%, phenol tar content 1.5%. Add NaOH to the reaction liquid at 20% by mass of the total amount of phenol tar, and mix uniformly.

[0018] The height of the dehydration tower is 800mm, the diameter of the tower is 50mm, and ceramic Raschig ring packing is used, and the packing height is 550mm; the tower height of the rectification tower is 900mm, the tower diameter is 20mm, and the packing height is 700mm. According to the product separation process of quinone, the reaction liquid is dehydrated under normal pressure, phenol is separated under reduced pressure, catechol is separated under reduced pressure, and hydroquinone and tar are separated under reduced pressure. The specific process is as follows.

[0019] Investigation of the process conditions of the dehydration tower The operating pressure is...

Embodiment 2～4

[0022] Using the same process and experimental conditions as in Example 1, changing the amount of NaOH added, the results are shown in Table 1.

Embodiment 5～13

[0024] Using the same process and experimental conditions as in Example 1, changing the type of alkali metal compound, the results are shown in Table 1.

[0025] Phenol tar composition and fluidity when adding alkali metal compound in table 1

[0026]

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Abstract

This invention provides a method for suppressing hydroxyl condensation and increasing fluidness of phenol tar with chemical measures, which adds alkali metallic compounds in a separation process of phenol hydroxylation reaction solution in 5-60% gross mass of phenol tar in terms of hydrates to be reacted with part of the tar to generate alkali metal phenol salt matters and suppress the dewatered condensation among molecules to keep good fluidness of the tar.

Description

technical field [0001] The invention relates to a method for separating phenol tar from a phenol hydroxylation reaction solution, that is, a method for separating phenol tar from a mixed material containing water, phenol, catechol, hydroquinone and phenol tar, especially It is a method for separating phenol tar from a mixture of hydroquinone and tar. Background technique [0002] In the process of producing ortho / hydroquinone by hydroxylation of phenol, the generation of tar-like by-products is unavoidable while obtaining quinone. This kind of tar is mainly composed of polyhydroxy diphenyl ether compounds, has certain water solubility, is black in color, has high viscosity, and has an initial freezing point lower than 100°C and no boiling point. When separating hydroquinone and phenol tar, the temperature of the tower tank of the decoking tower is relatively high (about 210-250 ° C), and with the prolongation of the residence time of phenol tar in the tower tank, the phenol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/74C07C37/88C07C39/08
Inventor 许宁赵志宏冯世强张春雷马建学邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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