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Method for recovering phenol and acetophenone in phenol tar

A recovery method, the technology of acetophenone, applied in the field of recovery of phenol and acetophenone in phenol tar, can solve the problems of low catalytic cracking yield, easily damaged equipment, high residue viscosity, etc., and achieve simple equipment, reasonable process, The effect of easy industrial application

Pending Publication Date: 2021-12-24
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the by-product phenol tar produced by domestic phenol plants is mainly obtained through catalytic thermal cracking to obtain phenol, cumene and α-methylstyrene, etc., but the catalytic cracking yield is low and the residue after thermal cracking has a high viscosity, which is easy to damage equipment, etc. disadvantages

Method used

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  • Method for recovering phenol and acetophenone in phenol tar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The phenol tar discharged from the phenol acetone unit is 1000kg / h, the temperature is 160 degrees, the content of phenol is 14.63%, the content of acetophenone is 18.6%, and the rest are high boiling substances. The pressure is 6kpaA, the jacket is heated by 10bar steam, the wiped film evaporator condenser discharges light components, the flow rate is 303kg / h, of which phenol 133kg / h and acetophenone 170kg / h, the bottom of the wiped film evaporator is residual phenol tar , The flow rate is 697kg / h.

[0035] The distilled light components and 13kg / h of 20wt% sodium hydroxide solution are mixed through a static mixer and then enter the chromatograph, phenol reacts with sodium hydroxide to generate sodium phenate, which is dissolved in water, and the upper part of the chromatograph is discharged rich in The component of acetophenone, the flow rate 170kg / h, is sent to the acetophenone rectification tower, the top discharges the light component 3kg / h, the side line extracts...

Embodiment 2

[0037] The phenol tar discharged from the phenol acetone unit is 1000kg / h, the temperature is 120 degrees, the content of phenol is 5%, the content of acetophenone is 30%, and the rest is high boiling matter, which enters the flash tank. The operating temperature of the flash tank is 120 degrees, and the operating pressure is 0.1 kpaA, the bottom of the flash tank is heated by a thermosiphon reboiler, the heating medium is 10bar steam, and there is a condenser on the top of the flash tank to discharge light components. h, the bottom of the flash tank is residual phenol tar, with a flow rate of 697kg / h.

[0038] The distilled light component and 3kg / h of 20wt% potassium hydroxide solution are mixed through a static mixer and then enter the chromatograph, phenol reacts with sodium hydroxide to generate sodium phenate, which is dissolved in water, and the upper part of the chromatograph discharges rich The component of acetophenone, the flow rate 170kg / h, is sent to the acetophen...

Embodiment 3

[0040] The phenol tar discharged from the phenol acetone unit is 1000kg / h, the temperature is 160 degrees, the content of phenol is 30%, the content of acetophenone is 5%, and the rest is high boiling matter, which enters the rectification tower. The operating temperature of the rectification tower is 220 degrees, and the operating pressure is 20kpaA ,The bottom of the flash tank is heated by a thermosiphon reboiler, the heating medium is 30bar steam, there is a condenser on the top of the rectification tower, and the light components are discharged, the flow rate is 320kg / h, of which phenol is 290kg / h and acetophenone is 30kg / h , the bottom of the rectifying tower is residual phenol tar, and the flow rate is 680kg / h.

[0041] The distilled light components and 300kg / h of 20wt% ammonia solution are mixed through a static mixer and then enter the chromatograph. Components, with a flow rate of 30kg / h, are sent to the acetophenone rectifying tower, and the light components are di...

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Abstract

The invention discloses a method for recovering phenol and acetophenone in phenol tar, the method comprises the following steps: step 1, feeding the phenol tar discharged by a phenol-acetone device into separation equipment, wherein discharged light components mainly comprise phenol and acetophenone, and residual phenol tar at the bottom of the separation equipment is discharged; step 2, mixing the light components generated in the step 1 with an alkali solution, feeding the mixture into a first chromatographic device, dissolving phenol and alkali in water after reaction, discharging a component rich in acetophenone from the upper part of the first chromatographic device, and feeding the component rich in acetophenone into a rectifying tower for rectification to obtain an acetophenone product; discharging a phenol-rich solution from the bottom of the first chromatography device; and step 3, neutralizing the phenol-rich solution generated in the step 2 with acid in a neutralization tank until the solution is neutral, feeding the solution into a second chromatographic device, discharging crude phenol from the upper part of the second chromatographic device, and discharging wastewater from the bottom of the second chromatographic device. According to the method for recovering phenol and acetophenone in the phenol tar, phenol and acetophenone can be effectively extracted from phenol tar, and produced phenol meets commercial requirements.

Description

technical field [0001] The invention relates to the technical field of phenol tar recovery, in particular to a method for recovering phenol and acetophenone in phenol tar. Background technique [0002] Phenol tar is the main by-product of the production of phenol-acetone by cumene method. The phenol acetone plant produces 0.03-0.04 tons of phenol tar for every 1 ton of phenol produced. Phenol tar is currently used as a fuel in a power plant for burning. Because phenol tar contains phenol, it is difficult to incinerate phenol tar. In consideration of environmental protection, phenol tar is also used as a fuel. restrictions and therefore have no commercial value. [0003] Acetophenone contained in phenol tar is an important organic compound. The material components in phenol tar are various, mainly including phenol, acetophenone, α-methylstyrene dimer, cumylphenol and its isomers and other heavy components, of which acetophenone accounts for more than 20%. Phenol, phenol, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/72C07C37/86C07C37/68C07C39/04C07C45/78C07C45/80C07C45/82C07C49/78
CPCC07C37/005C07C37/685C07C37/72C07C37/86C07C45/78C07C45/80C07C45/82C07C39/04C07C49/78
Inventor 裴凯凯刘肖肖贾微印立峰马伟丽刘祎婷吕睿
Owner CHINA PETROLEUM & CHEM CORP
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