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Preparation method of Janus particles and application of Janus particles in cyclohexene hydration process

A particle and peracid technology, which is used in the preparation of Janus particles and the application field in the hydration process of cyclohexene, can solve the problems affecting the conversion rate of cyclohexene, the imbalance of the reaction phase interface, etc., and improve the conversion rate of cyclohexene. , the effect of improving the conversion rate of cyclohexene and the selectivity of ideal cyclohexene

Active Publication Date: 2020-10-23
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, ordinary amphiphilic catalysts cannot truly be half hydrophilic and half hydrophobic, and there is an imbalance between the reaction phase interface, which affects the conversion rate of cyclohexene

Method used

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  • Preparation method of Janus particles and application of Janus particles in cyclohexene hydration process
  • Preparation method of Janus particles and application of Janus particles in cyclohexene hydration process
  • Preparation method of Janus particles and application of Janus particles in cyclohexene hydration process

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Experimental program
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Effect test

Embodiment 1

[0041] A method for preparing Janus particles includes the following steps:

[0042] (1) Accurately measure 10g of HZSM-5 molecular sieve, use phosphotungstic acid solution for equal volume impregnation; determine the saturated water absorption rate of HZSM-5 molecular sieve is 0.625mL / g, weigh out 0.06g phosphotungstic acid, and configure it according to the saturated water absorption rate The phosphotungstic acid solution (6.25mL) that can make HZSM-5 is immersed in equal volume; stir the HZSM-5 molecular sieve, add the configured phosphotungstic acid solution to it while stirring, continue to stir until the stirring is uniform; Put the HZSM-5 molecular sieve in an oven and dry at 120°C for 12h; after drying, put it into a muffle furnace and roast at 400°C for 4h to obtain a phosphotungstic acid modified HZSM-5 molecular sieve. The phosphotungstic acid loading is HZSM-5 The mass of the molecular sieve is 0.6% by weight.

[0043] (2) The phosphotungstic acid modified HZSM-5 molec...

Embodiment 2

[0048] The difference from embodiment 1 is: in step (1), 0.02 g of phosphotungstic acid is weighed; other technical features are the same as embodiment 1. The load of phosphotungstic acid is 0.2wt% based on the mass of HZSM-5 molecular sieve.

Embodiment 3

[0050] The difference from embodiment 1 is: in step (1), 0.04 g of phosphotungstic acid is weighed; other technical features are the same as in embodiment 1. The load of phosphotungstic acid is 0.4wt% based on the mass of HZSM-5 molecular sieve.

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Abstract

The invention discloses a preparation method of Janus particles and application of the Janus particles in a cyclohexene hydration process. The preparation method of the Janus particles comprises the following steps: immobilizing an HZSM-5 molecular sieve subjected to acid modification or alkali modification through paraffin, and then carrying out silanization modification. Preferably, an acid modifier is phosphotungstic acid, and an alkali modifier is sodium carbonate. The molecular sieve is immobilized by the paraffin, so that one side of the molecular sieve is protected by the paraffin, andthe other side can be modified by a silanization reagent. Compared with the traditional amphiphilic catalyst, the amphiphilic catalyst prepared by using n-octyl trimethoxy silane as the modifier has the advantages that one surface is hydrophilic and the other surface is hydrophobic, so that the catalyst is more stable in the middle of a phase interface, the phase interface imbalance phenomenon isavoided, and the conversion rate is further improved.

Description

Technical field [0001] The invention belongs to the technical field of organic synthesis, and specifically relates to a method for preparing Janus particles and its application in a cyclohexene hydration process. Background technique [0002] Cyclohexanol is an important intermediate raw material for the production of caprolactam. Caprolactam is mainly used for polyamide (commonly known as nylon, also known as nylon 6) for its unique characteristics of wear resistance, corrosion resistance, mildew resistance, high strength, softness and mild skin touch. ) Production of resins and synthetic fibers. In the past few years, caprolactam has been in increasing demand in Asia, especially in China. It is expected that the CPL required by my country’s polyamide engineering plastics will rise sharply at an average annual rate of 6.4% in the future. The hydration of hexene to produce cyclohexanol is of great significance. [0003] Cyclohexene hydration is a typical heterogeneous reaction. Th...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J27/188C07C29/04C07C35/08
CPCB01J31/34B01J31/26B01J27/188C07C29/04C07C2601/14C07C2531/34C07C2531/26C07C2527/188C07C35/08
Inventor 田晖刘帅邓帅孙大海
Owner YANTAI UNIV
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