Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of catalyst for preparing p-xylene by alkylation of toluene and methanol and its application

A xylene catalyst and catalyst technology, applied in physical/chemical process catalysts, molecular sieve catalysts, organic chemistry, etc., can solve the problems of unfavorable shape-selective reactions and achieve excellent selectivity, good activity stability, and improved reaction performance.

Active Publication Date: 2011-12-21
CHINA PETROLEUM & CHEM CORP +1
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the acidic sites on the outer surface of molecular sieves are generally unfavorable for shape-selective reactions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of catalyst for preparing p-xylene by alkylation of toluene and methanol and its application
  • A kind of catalyst for preparing p-xylene by alkylation of toluene and methanol and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 10 grams of BP-1 molecular sieves, mix it with 5.36g ethyl orthosilicate (Beijing Chemical Reagent Company, analytically pure, SiO 2 Content 28%), 3.33g tetrapropylammonium bromide (Guangzhou Dayou fine chemical factory production, analytical purity, 99%) 12ml aqueous solution is mixed, it is placed in the crystallization kettle that contains polytetrafluoroethylene liner, at 150 After static crystallization at ℃ for 20 hours, cool to room temperature, after that, dry the molecular sieve at 120 ℃ for 4 hours, and roast at 550 ℃ for 3 hours to obtain the catalyst SP-1 provided by the invention, the phosphorus content, crystallinity and D value of SP-1 Listed in Table 1.

Embodiment 2

[0044] Take by weighing 10 grams of BP-1 molecular sieves, mix it with 2.53g methyl orthosilicate (Beijing Chemical Reagent Company, analytically pure, 99%), 8.17g tetraethylammonium hydroxide (produced by Guangzhou Dayou Fine Chemical Factory, Tetraethylammonium hydroxide 27% by weight, water 73% by weight) are mixed, it is placed in the crystallization kettle that contains polytetrafluoroethylene liner, is cooled to room temperature after static crystallization at 180 ℃ for 20 hours, afterwards, molecular sieve is in 120 ℃ drying for 4 hours, 550 ℃ roasting for 3 hours to obtain the catalyst SP-2 provided by the present invention, and the phosphorus content, crystallinity and D value of SP-2 are listed in Table 1.

Embodiment 3

[0046] Take by weighing 10 gram HZSM-5 (2) molecular sieves, it is impregnated in 12ml, in the aqueous solution containing 0.93 gram ammonium dihydrogen phosphate (Beijing Yili Fine Chemicals Co., Ltd., analytically pure, 99%), normal temperature immersion 8 hours, After drying at 120°C and calcining at 550°C for 3 hours, phosphorus-loaded ZSM-5 was obtained.

[0047] Get 10 grams of the above-mentioned molecular sieves loaded with phosphorus, and mix it with 1.428g ethyl orthosilicate (Beijing Chemical Reagent Company, analytically pure, SiO 2 content 28%), 1.815g tetraethylammonium hydroxide (Guangzhou Dayou fine chemical factory production, tetraethylammonium hydroxide 27% by weight, water 73% by weight), 4.42g n-hexane (Beijing Chemical Plant, analytically pure, 95%) were mixed, placed in a crystallization kettle with a polytetrafluoroethylene liner, and cooled to room temperature after static crystallization at 170°C for 20 hours. After that, the molecular sieves were dri...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
crystallinityaaaaaaaaaa
crystallinityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a p-xylene catalyst prepared by toluene and methanol alkylation and application thereof. The xylene catalyst contains a silica and phosphorus modified ZSM-5 molecular sieve, and the relative crystallinity of the molecular sieve is at least 75 percent, the distribution D of phosphorus meets the requirement that D is more than or equal to zero and less than or equal to 0.5, wherein D=P(S) / P(C); the P(S) refers to the phosphorus content of the molecular sieve crystal from the edge to one fifth of the center, which is characterized by a TEM-EDX method; and the P (C) refers to the phosphorus content in the center of the molecular sieve crystal. When used for preparing p-xylene by the toluene and methanol alkylation, the catalyst has excellent p-xylene selectivity and good activity stability.

Description

technical field [0001] The invention relates to a catalyst for preparing p-xylene by alkylation of toluene and methanol and its application. Background technique [0002] ZSM-5 molecular sieve is a medium pore molecular sieve with MFI structure. It has a unique pore structure and is widely used in reaction processes such as alkylation, isomerization, disproportionation, catalytic cracking, and catalytic dewaxing. [0003] P-xylene is an important chemical industry raw material, and it is a very economical and feasible way to produce p-xylene by alkylation of toluene with methanol in the presence of ZSM-5 molecular sieve catalyst. [0004] However, the acid sites on the outer surface of molecular sieves are generally unfavorable for shape-selective reactions. For example, in the alkylation reaction of toluene and methanol, toluene and methanol undergo alkylation reaction in molecular sieve crystals to generate xylene, and xylene also undergoes isomerization reaction. Among ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J27/182C07C15/08C07C2/88
CPCY02P20/52
Inventor 王萍孙敏王永睿慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP