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Moving bed method for producing m-cresol and p-cresol through isomerization of o-cresol

A technology of o-cresol and moving bed, which is applied in the field of moving bed for the isomerization of o-cresol to produce m-cresol and p-cresol, which can solve the problems of short catalyst life and achieve the effect of overcoming the short life of catalyst

Active Publication Date: 2013-12-18
BEIJING RISUN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method enables the isomerization reaction and catalyst regeneration to be carried out continuously, thereby overcoming the problems of short catalyst life and frequent shutdown for regeneration in the previous fixed-bed process

Method used

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  • Moving bed method for producing m-cresol and p-cresol through isomerization of o-cresol

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0051] According to the method disclosed in US Patent No. 4,691,063, H-type ZSM-5 molecular sieves were prepared. H type ZSM-5 molecular sieve (SiO 2 / Al 2 o 3 Molar ratio=38) 10.0kg+10wt%Al 2 o 3 (Pseudo-boehmite powder) + 25wt% kaolin + 3000ml 10wt% nitric acid aqueous solution and 2000ml deionized water, mixed to prepare spherical particles. Then the spherical particles were dried in air at 60°C for 4 hours, at 120°C for 4 hours, and then calcined at 550°C for 3 hours.

[0052] With the product 10kg obtained above, 2wt% (NH 4 ) 2 HPO 4 The aqueous solution was soaked at room temperature for 12 hours, dried at 60°C for 4 hours in air, dried at 120°C for 4 hours, and then calcined at 520°C for 3 hours. 5kg of the product thus obtained was added to 3wt% SiCl 4 In the cyclohexane solution, stirred in an oil bath at 90°C for 4-6h, filtered, washed, then dried in air at 120°C for 8 hours, and calcined at 520°C for 4 hours to obtain a catalyst 1 with a Si loading of 2.0wt...

preparation Embodiment 2～5

[0054] Catalysts 2 to 5 were prepared in the same manner as in Preparation Example 1, except that mordenite, ZSM-11, Y zeolite, and MCM-22 were used instead of ZSM-5 in Preparation Example 1, respectively.

Embodiment 1

[0056] The o-cresol is gasified and superheated in the preheater 1 and mixed with the carrier gas to obtain the reaction raw material I; the reaction raw material I is passed into the moving bed reactor (purchased from Beijing Aerospace Century Star Technology Co., Ltd., model: non-standard Custom-made device, the reactor of 2500ml) is contacted with catalyst 1, obtains the reaction mixture II that is rich in m-cresol and p-cresol after isomerization reaction. The reaction conditions are: the loading amount of catalyst 1 is 2500ml, the reaction temperature is 380°C, and the volume space velocity of o-cresol is 1.0h -1 , nitrogen as the carrier gas. Reaction obtains the reaction mixture II containing m-cresol and p-cresol, enters rectifying tower 7 after cooling, obtains A cut through rectifying separation: phenol and o-cresol; B cut: m-cresol and p-cresol; and Fraction C: heavy fraction.

[0057] Then, the B fraction is passed into the product storage tank, and then separate...

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Abstract

The invention relates to a moving bed method for producing m-cresol and p-cresol through the isomerization of o-cresol. The method disclosed by the invention comprises the following steps: a) after the o-cresol is gasified and overheated, mixing the o-cresol with a carrier gas so as to obtain a reaction raw material I; b) feeding the reaction raw material I into a moving bed reactor, so that the reaction raw material I is in contact with a catalyst, and carrying out an isomerization reaction to obtain a m-cresol- and p-cresol-containing reaction mixture II; c) rectifying and separating the reaction mixture II so as to obtain a fraction A including phenol and o-cresol, a fraction B including m-cresol and cresol, and a fraction C including heavy components; d) feeding the fraction B into a product storage tank, mixing the fraction A and the fraction C with the reaction raw material I and feeding the obtained mixture into the moving bed reactor to carry out an isomerization reaction; and e) feeding a catalyst to be regenerated discharged from the bottom of the moving bed reactor into a catalyst regenerator, so that the catalyst to be regenerated is in contact with a regeneration gas and then subjected to burning regeneration, and returning the regenerated catalyst from the lower part of the catalyst regenerator to the moving bed reactor, thereby realizing the cycle use of the catalyst.

Description

technical field [0001] The invention relates to a moving bed method for isomerizing o-cresol to produce m-cresol and p-cresol. Background technique [0002] Cresol is an important fine chemical intermediate, including three isomers, namely, o-cresol, p-cresol and m-cresol. Widely used in pesticides, medicines, spices, dyes, antioxidants, polymerization inhibitors, ultraviolet absorbers, fuel additives, rubber additives, coatings, feed additives and synthetic materials. In particular, the supply of p- and m-cresol is seriously in short supply in China, and a considerable amount needs to be imported every year to meet the domestic market demand. [0003] The traditional preparation method of m-cresol and p-cresol is a natural separation method, and three isomers of p-, m-, and o-cresol can be obtained from coal tar by separation. Due to limited resources and complex processes, since the success of chemical synthesis, natural separation devices have been shut down continuousl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C39/07C07C37/00
CPCY02P20/584
Inventor 张英伟张令霞孙长江薛全民宿亮虎张朋印文雅
Owner BEIJING RISUN TECH CO LTD
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