A kind of preparation method and application of catalyst for preparing p-methylethylbenzene by alkylation

The technology of p-methylethylbenzene and catalyst is applied in the field of preparation of catalyst for preparing p-methylethylbenzene by alkylation, and can solve the problems of low methylethylbenzene conversion rate of ethanol, poor catalyst activity, short catalyst life and the like, Achieve the effect of inhibiting transalkylation, improving selectivity, preventing disproportionation and isomerization

Active Publication Date: 2019-08-30
XIAN ORIGIN CHEM TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common problem is that the catalyst has poor activity and short life.
[0005] Alkylation of toluene and ethanol to prepare p-methylethylbenzene catalysts with high selectivity is currently the main problem in industrial application is the activity of the catalyst, low ethanol conversion rate and low selectivity of p-methylethylbenzene and the catalyst life is too long short one key question

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 preparation method and application of catalyst for preparing p-methylethylbenzene by alkylation
  • A kind of preparation method and application of catalyst for preparing p-methylethylbenzene by alkylation
  • A kind of preparation method and application of catalyst for preparing p-methylethylbenzene by alkylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1. Mix and knead 14.0g of hydrogen ZSM-5 / ZSM-11 molecular sieve, 8.96g of pseudoboehmite and dilute nitric acid with a mass concentration of 5%, and extrude them into strips with a diameter of 1.6mm and a length of 1 to 3mm. Dry at 120°C for 4 hours to obtain a 20g extruded product; SiO in the hydrogen-type ZSM-5 / ZSM-11 molecular sieve 2 / Al 2 o 3 The molar ratio is 80; the mass percentage of HZSM-5 / ZSM-11 molecular sieve in the extruded product is 70%, and the balance is Al 2 o 3 ;

[0037] Step 2, 20g extruded product and 100g molar concentration in step 1 are the AlCl of 1.0mol / L 3 Put the solution together into a three-diameter bottle and treat it at 100°C for 2 hours, then filter with suction to obtain a filter residue, which is calcined at 500°C for 3 hours to obtain a modified molecular sieve M;

[0038] Step 3. The modified molecular sieve M described in step 2 is modified with cerium and phosphorus by an equal-volume impregnation method to obtain a mo...

Embodiment 2

[0046] Step 1. Mix and knead 13.5g of hydrogen-type ZSM-5 / ZSM-11 molecular sieve, 20.0g of pseudoboehmite and dilute nitric acid with a mass concentration of 3%, and extrude into strips with a diameter of 1.6mm and a length of 1 to 3mm. Dry at 120°C for 4 hours to obtain 27g extruded product; SiO in the hydrogen ZSM-5 / ZSM-11 molecular sieve 2 / Al 2 o 3 The molar ratio is 180; the mass percentage of HZSM-5 / ZSM-11 molecular sieve in the extruded product is 50%, and the balance is Al 2 o 3 ;

[0047] Step 2, 27g extruded product and 135g molar concentration in step 1 are the AlCl of 0.5mol / L 3 Put the solution together into a three-diameter bottle and treat it at 100°C for 6 hours, and then obtain the filter residue by suction filtration, and obtain the modified molecular sieve M after roasting the filter residue at 500°C for 3 hours;

[0048] Step 3. The modified molecular sieve M described in step 2 is modified with cerium and phosphorus by an equal-volume impregnation met...

Embodiment 3

[0055] Step 1. Mix and knead 14.5g of hydrogen-type ZSM-5 / ZSM-11 molecular sieve, 8.45g of pseudoboehmite and dilute nitric acid with a mass concentration of 3%, and extrude them into strips with a diameter of 1.6mm and a length of 1-3mm. Dry at 120°C for 4 hours to obtain a 20g extruded product; SiO in the hydrogen-type ZSM-5 / ZSM-11 molecular sieve 2 / Al 2 o 3 The molar ratio is 200; the mass percentage of HZSM-5 / ZSM-11 molecular sieve in the extruded product is 85%, and the balance is Al 2 o 3 ;

[0056] Step 2, 20g extruded product and 100g molar concentration in step 1 are the AlCl of 2.0mol / L 3 Put the solution together into a three-diameter bottle and treat it at 100°C for 2 hours, then filter with suction to obtain a filter residue, which is calcined at 500°C for 3 hours to obtain a modified molecular sieve M;

[0057] Step 3. The modified molecular sieve M described in step 2 is modified with cerium and phosphorus by an equal-volume impregnation method to obtain a...

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

No PUM Login to View More

Abstract

The invention discloses a preparation method of a catalyst for preparing p-methyl ethylbenzene by alkylation and application of the catalyst. The method comprises the following steps: 1. kneading a hydrogen-type ZSM-5 / ZSM-11 molecular sieve, pseudoboehmite and diluted acid, carrying out extrusion forming, and drying to obtain a strip formed product; 2. immersing the strip formed product in an AlCl3 solution to perform Al modification treatment, and carrying out roasting treatment to obtain a modified molecular sieve M; 3. carrying out cerium and phosphorus modification treatment on the modified molecular sieve M by an isometric impregnation process to obtain a modified molecular sieve N; and 4. roasting the modified molecular sieve N to obtain the catalyst. Besides, the invention also discloses application of the catalyst for catalyzing alkylation reaction between methylbenzene and ethanol to prepare p-methyl ethylbenzene. Compared with the like catalysts at present, the activity and stability are greatly enhanced, the selectivity of the product for p-methyl ethylbenzene is increased, and the catalyst has favorable industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of petrochemical catalysts, and in particular relates to a preparation method and application of a catalyst for preparing p-methylethylbenzene by alkylation. Background technique [0002] P-methylstyrene can be obtained by dehydrogenation of p-methylethylbenzene, which can be polymerized to produce a new type of plastic, polymethylstyrene, which is superior to existing polymers in terms of specific gravity, heat resistance, transparency and shrinkage Polystyrene plastic. In addition, p-methylstyrene can be copolymerized with other monomers, which can improve the heat resistance and flame retardancy of some polymers, and can be widely used in the manufacture of engineering plastics, alkyd resin coatings, etc., so it has been widely valued. [0003] At present, there is no satisfactory preparation method for obtaining high-yield p-methylethylbenzene in the market. The key is that the catalyst core for prepari...

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 & AuthorityPatents(China)
IPC IPC(8): B01J29/80C07C2/86C07C15/02
Inventor顾建峰王新星钱晓磊崔楼伟
OwnerXIAN ORIGIN CHEM TECH