Separation and purification system and method for phenol and hydrogen peroxide hydroxylation reaction mixed liquid

A purification method and hydroxylation technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of high energy consumption of dehydration towers, hindered production, difficult discharge, etc., to reduce the difficulty of dephenolization and equipment Investment, reduce product energy consumption, good fluidity effect

Pending Publication Date: 2022-07-05
JIANGSU YIDA CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, these technologies still inevitably have certain defects: Although the latter patent of Tianjin University has optimized energy saving and consumption reduction and the purity of hydroquinone products compared with the former, there are still problems such as high energy consumption in the dehydration tower and satisfactory quality of catechol products. It does not meet the defects required by high-end customers in the market; at the same time, the product in the tar is extracted by a deep steamer in its process, and there is more hydroquinone in the tar due to the expansion of the tar
The patent CN101054340A of Shanghai Huayi Acrylic Acid Co., Ltd. puts the tar in the final step of separation. The tar stays for a long time and is easy to expand, carbonize, and crack. It cannot be produced normally and the purity of the product is polluted.
[0011] Although the patents of Rhone Planck Company and Rhodea Chemical Company use a wiped film evaporator in the tar extraction, the content of hydroquinone in the tar is reduced, but due to the characteristics of the tar, the content of hydroquinone in the tar is still high 4%, and the viscosity of tar is high, and the difficulty of discharge will easily lead to production obstruction, high energy consumption for dehydration and dephenolization, and the quality of catechol products cannot meet the requirements of high-end customers in the market; in addition, the melting crystallizer is used in the patent of Rhodia Chemical Obtaining resorcinol and hydroquinone is difficult to operate and has relatively high requirements for public works

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  • Separation and purification system and method for phenol and hydrogen peroxide hydroxylation reaction mixed liquid
  • Separation and purification system and method for phenol and hydrogen peroxide hydroxylation reaction mixed liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The composition of 57% phenol, 33% water, 6.2% catechol, 3.2% hydroquinone, 0.2% resorcinol, 0.4% tar raw material liquid is treated, see the treatment process figure 1 .

[0066] (1) Double-effect dehydration

[0067] The flow rate of 480Kg / h is sent to the double-effect dehydration flasher. The operating conditions of the double-effect dehydration flasher are the pressure of 30Kpa and the temperature of 70-80℃. , the residual liquid of the double-effect dehydration flasher is sent to the first-effect dehydration flasher, and the vaporized gas phase of the first-effect dehydration flasher material enters the double-effect dehydration flasher heater shell side. After condensation, an aqueous solution containing 7.8% phenol is obtained. The operating conditions of the first-effect dehydration flasher are the pressure of 50Kpa and the temperature of 80-90°C. The residual liquid of the first-effect dehydration flasher is sent to the second-effect dehydration tower, and th...

Embodiment 2

[0081] The composition of 39.4% phenol, 50% water, 3.0% catechol, 6.6% hydroquinone, 0.3% resorcinol, 0.7% tar raw material liquid is processed. For the processing flow, see figure 1 .

[0082] (1) Double-effect dehydration

[0083] The raw material liquid is sent to the double-effect dehydration flasher at a flow rate of 480Kg / h. The operating conditions of the double-effect dehydration flasher are the pressure of 30Kpa and the temperature of 70-80 °C. The residual liquid of the double-effect dehydration flasher is sent to the first-effect dehydration flasher, and the vaporized gas phase of the first-effect dehydration flasher enters the shell side of the double-effect dehydration flasher heater. After condensation, an aqueous solution containing 7.7% phenol is obtained. The operating conditions of the dehydration flasher are the pressure of 50Kpa and the temperature of 80-90℃. The residual liquid of the first-effect dehydration flasher is sent to the second-effect dehydrati...

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Abstract

The invention provides a separation and purification system and method for a phenol and hydrogen peroxide hydroxylation reaction mixed liquid. The system comprises a double-effect dehydration flash evaporator, a first-effect dehydration flash evaporator, a double-effect dehydration rectifying tower, a first-effect dehydration phenol removal tower, a catechol removal tower, a catechol crude distillation tower, a catechol rectifying tower, a tar crude distillation and dilution evaporation assembly and a m-hydroquinone / hydroquinone separation tower which are connected in series, the resorcinol rectifying tower and the hydroquinone rectifying tower are respectively connected with the upper part and the lower part of the m / hydroquinone separating tower. During separation and purification, the reaction liquid is sequentially subjected to the procedures of double-effect flash dehydration, double-effect rectification dehydration, first-effect dehydration and dephenolization, catechol removal, catechol crude distillation and rectification, tar crude distillation and mixed diphenol separation, and through the procedures, the product energy consumption is reduced, and meanwhile, the product requirements of high-end customers in the market are met; and the operation is simple and convenient and the production is stable.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a separation and purification system and method for a mixed liquid of phenol and hydrogen peroxide hydroxylation reaction. Background technique [0002] Hydroquinone, the molecular formula is C 6 H 6 O 2 , with three isomers: ortho, meta and para, all three isomers are used as important chemical raw materials and intermediates, and have a wide range of applications: [0003] Catechol, also known as catechol, is a compound formed after two ortho-position hydrogens of benzene are replaced by hydroxyl groups. It is an important basic organic chemical raw material and an important intermediate in the pharmaceutical industry. It is widely used in the production of dyes and light stabilizers. , photosensitive materials, fragrances, preservatives, accelerators, special inks, electroplating materials, raw lacquer flame retardants, in addition, is a widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/74C07C39/08C07C39/04
CPCC07C37/74C07C39/08C07C39/04
Inventor 焦永东刘淮吴建磊戴鑫居振楠李晓清
Owner JIANGSU YIDA CHEM
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