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Toluene methanol alkylation method

An alkylation, methanol technology, applied in chemical instruments and methods, organic chemistry, molecular sieve catalysts, etc., can solve problems such as low reactivity

Active Publication Date: 2013-09-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of low reaction activity of toluene methanol alkylation in the past, and a new method for heavy toluene methanol alkylation is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 5 grams of PDDA (20%wt) was dissolved in 495 milliliters of deionized water and stirred evenly, 320 grams of ZSM-5 former powder was added in this surface modifier solution, the temperature was raised to 30°C under stirring and kept for 3 hours, filtered and After drying in the air atmosphere at 100°C, add it to the zeolite beta nanocrystal suspension for pre-adhesion for 120 minutes, filter and dry in the air atmosphere at 100°C to obtain the treated ZSM-5 powder. 40 grams of tetraethyl orthosilicate, 2.3 grams of sodium aluminate, 18 grams of sodium chloride, 6 milliliters of sulfuric acid, 20 milliliters of tetraethylammonium hydroxide, 10 milliliters of ammonia and 400 milliliters of water can be evenly gelled to obtain zeolite beta Molecular sieve synthesis system. Add 320 grams of treated ZSM-5 powder into the gelling solution and stir for 2 hours. The mixed system was transferred into a polytetrafluoroethylene-lined stainless steel crystallization kettle, and st...

Embodiment 2～7

[0056] Examples 2-7 are based on the synthesis ratio and synthesis conditions in Table 1, and are synthesized according to the similar method and steps of Embodiment 1 to obtain core-shell molecular sieves CS2-7, see Table 1 for details.

[0057] Table 1 Preparation conditions of core-shell molecular sieves

[0058]

Embodiment 8～13

[0060] In Examples 8-13, hydrogen-type core-shell molecular sieve catalysts HCS-Cat8-13 and modified core-shell-type molecular sieve catalysts MCS-Cat8-13 were prepared in a similar manner to Example 1.

[0061] Table 2 Preparation conditions of hydrogen-type core-shell molecular sieve catalysts

[0062] Example number

Core-shell molecular sieve catalyst

Core-shell molecular sieve number

binder

Molecular sieve: binder, ratio %

Example 8

HCS-Cat8

CS2

Al 2 o 3

95∶5

Example 9

HCS-Cat9

CS3

Al 2 o 3

60∶40

Example 10

HCS-Cat10

CS4

al 2 o 3

45∶55

Example 11

HCS-Cat11

CS5

Al 2 o 3

70∶30

Example 12

HCS-Cat12

CS6

SiO 2

5∶95

Example 13

HCS-Cat13

CS7

SiO 2

50∶50

[0063] Table 3 Preparation conditions of modified core-shell molecular sieve catalysts

[0064] Example

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Abstract

The invention relates to a toluene methanol alkylation method mainly solving the problem that the activity of a past catalyst is low when toluene methanol alkylation reaction is carried out. The invention solves the problem well by adopting the technical scheme that the catalyst in the toluene methanol alkylation method comprises the following components in parts by weight: 5-95 parts of core-shell type molecular sieve material (a) and 95-5 parts of binder (b), wherein the core phase of a core-shell type molecular sieve is ZSM-5 (Zeolite Selony Mobil No.5), and a shell layer is a beta zeolite crystalline grain the coverage of which is 50-100 percent, and the toluene methanol alkylation method can be used for the industrial production of toluene methanol alkylation.

Description

technical field [0001] The invention relates to a method for alkylating toluene with methanol. Background technique [0002] P-xylene is an important raw material for the synthesis of polyester fibers. At present, toluene disproportionation and C 9 Aromatics transalkylation, xylene isomerization and toluene selective disproportionation and other methods of production. The equilibrium concentration of p-xylene obtained by the first two methods in all xylene isomers only accounts for about 24%. The boiling point is close, the separation conditions are harsh, and the equipment requirements are high. In the selective disproportionation reaction of toluene, two moles of toluene are needed to generate one mole of p-xylene with a purity of more than 85%, and the utilization rate of toluene is low. In the process of directly synthesizing high-concentration p-xylene by chemical reaction, the utilization rate of toluene is high, and the product is easy to separate, so this process ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/08C07C2/86B01J29/70B01J29/78B01J29/74B01J35/10
CPCY02P20/52
Inventor 邹薇孔德金
Owner CHINA PETROLEUM & CHEM CORP