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New method of preparing tert-butyl phenol by alkylation of phenol and isobutene

A technology of alkylation reaction and tert-butylphenol, which is applied in the field of reaction between phenols and isobutylene, can solve the problems of cost reduction, failure to achieve, increase equipment capital investment, etc., and achieve the goal of reducing production cost, simple equipment, and improving utilization rate Effect

Inactive Publication Date: 2007-04-18
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses high pressure to liquefy isobutene, and the liquid-liquid reaction is more uniform. There is no problem of tail gas treatment and a large amount of waste of raw materials in the reaction of liquefied isobutene and phenols, and the utilization rate of isobutene is improved. However, due to the need for pressurized conditions , there are special requirements for equipment, which will inevitably increase the capital investment of equipment
At present, both methods have certain shortcomings and cannot achieve the purpose of reducing costs.

Method used

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  • New method of preparing tert-butyl phenol by alkylation of phenol and isobutene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Below is to add Venturi injector and material liquid circulation pump and not add the device response data contrast of Venturi injector: Embodiment 1: (do not add the device response data of Venturi injector)

[0014] Add p-cresol 54g and concentrated sulfuric acid as a catalyst in a 250mL four-necked reaction flask with a stirring and condensing device, and the dosage is 1.35g. Raise the temperature to 60-65°C and feed isobutene gas. The isobutene in the exhaust gas is released. During the reaction, it is monitored by gas chromatography. When the BHT content reaches more than 90%, the isobutene is stopped. The gas flow rate is 150ml / min, and the time is 3.5h. The amount of isobutene used in the experiment is 78g. 30% of the isobutene is released as tail gas, and the utilization rate is 70%.

Embodiment 2

[0015] Embodiment 2: (add Venturi ejector and feed liquid circulation pump and not add the device reaction data of Venturi ejector)

[0016] The operation is carried out according to Example 1. The reaction device is added with a feed-liquid circulation pump and a Venturi injector. First, the entire system is replaced with isobutene. At the same time, the injector and the feed-liquid circulation pump are turned on, and part of the isobutene is delivered. After being measured by a U-shaped pressure gauge, Negative pressure in the kettle indicates that the isobutene gas in the kettle has reacted, and then input isobutene, and so on, until the gas chromatography monitors the BHT content to reach 90%, stop feeding isobutene, and the reaction is completed. The cumulative reaction time is 2.5 hours, the cumulative amount of isobutene used in the experiment is 58.95 g, and the theoretical value is 56 g. There is almost no waste of isobutene, and the utilization rate can be as high as ...

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Abstract

The present invention relates to a new method for preparing tert-butyl phenol by utilizing phenols and isobutylene and making them produce alkylation reaction. Said method is characterized by that on the basis of gas-liquid reaction equipment a Venturi ejector or gas-liquid mixing pump and a feed liquor circulating pump are added, so that the unreacted isobutylene can be further absorbed and fed into reaction still, under the action of ejector and feed liquor circulating pump the isobutylene gas and liquid material can be continuously circulated in the system so as to make the gas-liquid reaction be more uniform.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and provides a new method for reacting phenols and isobutene. Background technique [0002] Tert-butylphenols are a large class of important organic synthesis raw materials and intermediates in the field of fine chemicals, and are widely used in the manufacture of drugs and additives. Some of them are chemical products such as anti-aging agents, antioxidants, polymerization inhibitors and stabilizers, and are indispensable additives in oil refining industry, petrochemical enterprises and polymer material industry. Due to the outdated production process and high production cost of tert-butylphenol in my country, it cannot meet the growing domestic market requirements. [0003] At present, the reaction between phenols and isobutylene mostly adopts the following two methods, one is a simple gas-liquid reaction. Since this reaction is a gas-liquid reaction, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/06C07C37/14B01J19/26
CPCY02P20/582
Inventor 王守凯孙兵金丹蔡洪涛
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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