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A method and equipment for preparing 2,6-di-tert-butyl-p-cresol with a micro-reaction rectification plate

A di-tert-butyl and micro-reaction technology, applied in the field of preparation of 2,6-di-tert-butyl-p-cresol, can solve the problems of inability to meet complex and diverse actual chemical production needs, and achieve simplified product refining process and heat transfer area. Great effect on improving conversion rate

Inactive Publication Date: 2020-04-07
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the microchemical equipment currently studied is relatively simple in form, mainly focusing on single microchannels, or cross-shaped, Y-shaped crossed microchannels, etc., which are simple in structure and cannot meet the complex and diverse actual chemical production needs; on the other hand, research Researchers have conducted research on microchemical equipment for reaction and separation separately, without combining them. Therefore, the structure of microreaction and microdistillation devices, unit coupling mode, material flow mode, and hydraulic characteristics have yet to be studied.

Method used

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  • A method and equipment for preparing 2,6-di-tert-butyl-p-cresol with a micro-reaction rectification plate
  • A method and equipment for preparing 2,6-di-tert-butyl-p-cresol with a micro-reaction rectification plate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: Use above-mentioned equipment and process method to prepare 2,6-di-tert-butyl-p-cresol, wherein:

[0038] The preheating temperature of p-cresol preheater and isobutylene preheater is 70°C;

[0039] Raw material feed pressure is 0.5MPa;

[0040] Catalyst V 2 o 5 The mass fraction is 0.1%

[0041] The catalyst coating thickness is 2 μm;

[0042] The space velocity of p-cresol is 1.0h -1 ;

[0043] The molar ratio of p-cresol to isobutylene feed is 1:3.

[0044] The side length of the central chamber is 2200 μm;

[0045] The depth of the central chamber is 100 μm;

[0046] The upper and lower four side channels of the microchamber have a width of 100 μm;

[0047] The upper and lower central channels of the microchamber have a width of 200 μm;

[0048] The height of the π-shaped partition is 1500 μm;

[0049] The two legs of the π-shaped partition are at 80° to the top plate of the π-shaped partition;

[0050] The length of the top plate is 400 μm...

Embodiment 2

[0065] Embodiment 2: use above-mentioned equipment and process method to prepare 2,6-di-tert-butyl-p-cresol, wherein:

[0066] The preheating temperature of p-cresol preheater and isobutylene preheater is 70°C;

[0067] Raw material feed pressure is 0.5MPa;

[0068] Catalyst V 2 o 5 The mass fraction is 0.1%

[0069] The catalyst coating thickness is 2 μm;

[0070] The space velocity of p-cresol is 1.0h -1 ;

[0071] The molar ratio of p-cresol to isobutylene feed is 1:4.

[0072] The side length of the central chamber is 2200 μm;

[0073] The depth of the central chamber is 100 μm;

[0074] The upper and lower four side channels of the microchamber have a width of 100 μm;

[0075] The upper and lower central channels of the microchamber have a width of 200 μm;

[0076] The height of the π-shaped partition is 1500 μm;

[0077] The two legs of the π-shaped partition are at 80° to the top plate of the π-shaped partition;

[0078] The length of the top plate is 400 μm...

Embodiment 3

[0093] Embodiment 3: use above-mentioned equipment and process method to prepare 2,6-di-tert-butyl-p-cresol, wherein:

[0094] The preheating temperature of p-cresol preheater and isobutylene preheater is 70°C;

[0095] Raw material feed pressure is 0.5MPa;

[0096] Catalyst V 2 o 5 The mass fraction is 0.1%

[0097] The catalyst coating thickness is 2 μm;

[0098] The space velocity of p-cresol is 0.5h -1 ;

[0099] The molar ratio of p-cresol to isobutylene feed is 1:4.

[0100] The side length of the central chamber is 2200 μm;

[0101] The depth of the central chamber is 100 μm;

[0102] The upper and lower four side channels of the microchamber have a width of 100 μm;

[0103] The upper and lower central channels of the microchamber have a width of 200 μm;

[0104] The height of the π-shaped partition is 1500 μm;

[0105] The two legs of the π-shaped partition are at 80° to the top plate of the π-shaped partition;

[0106] The length of the top plate is 400 μm...

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Abstract

The invention relates to a technology method for preparing 2,6-ditertbutyl-4 methylphenol by using a micro-reaction rectifying plate. The method comprises the following steps of preheating p-cresol to 70 to 90 DEG C by a first preheater, and sending into the micro-reaction rectifying plate via an upper center passage; meanwhile, preheating isobutene to 70 to 90 DEG C by a second preheater, and sending into the micro-reaction rectifying plate via a lower center passage; enabling the p-cresol and the isobutene to react in the micro-reaction rectifying plate, so as to generate a liquid-phase product; discharging via a lower side passage of the micro-reaction rectifying plate, and rectifying and separating the liquid-phase reaction product, so as to obtain the 2,6-ditertbutyl-4 methylphenol; crystallizing again, and drying, so as to obtain a finished product; discharging the excessive isobutene and a low-boiling point product from an upper side passage of the micro-reaction rectifying plate. The technology method has the advantages that the conversion rate of the p-cresol is high, the yield rate of the 2,6-ditertbutyl-4 methylphenol is high, the reaction temperature is low, and the temperature runaway is avoided.

Description

technical field [0001] The present invention relates to a process for preparing 2,6-di-tert-butyl-p-cresol and its equipment, in particular to a process for preparing 2,6-di-tert-butyl-p-cresol with a micro-reaction rectification plate and its equipment. Background technique [0002] 2,6-di-tert-butyl-p-cresol is an excellent general-purpose phenolic antioxidant, which can inhibit or delay the oxidative degradation of plastics and rubber. It is widely used in various lubricating oils, gasoline, and paraffin. Used as a food antioxidant. The current production process is mainly an alkylation reaction, using alkylating agents such as isobutene, tert-butanol or methyl tert-butyl ether, and using concentrated sulfuric acid, aromatic sulfonic acid, etc. as catalysts, and reacting under normal pressure or high pressure. However, the traditional liquid acid is very corrosive to the equipment, which increases the equipment investment. After the alkylation, alkali washing and water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/14C07C37/68C07C37/74C07C37/84C07C39/06B01D3/00B01D3/14
CPCB01D3/009B01D3/14B01D3/141C07C37/14C07C37/685C07C37/74C07C37/84C07C39/06Y02P20/10
Inventor 吕建华葛珊珊李品刘继东
Owner HEBEI UNIV OF TECH
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