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A method for preparing fluidizable molecular sieves based on vibration embedding granulation

A molecular sieve and granulation technology, which is applied in the field of catalysis, can solve problems such as wear and tear, and achieve the effects of wide slurry range, optimized drying temperature of feed liquid, and high yield

Active Publication Date: 2019-05-17
CHINA HUANENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem solved by the present invention is to provide a method for preparing fluidizable molecular sieves based on vibration embedding granulation, improve the defects of the traditional single spray granulation method, increase the particle size of the catalyst, improve its mechanical strength, solve the problem of catalyst wear, and be able to Obtain catalyst particles with a particle size distribution of 60-90 μm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Catalyst granulation by vibration embedding granulation method, including the following operations:

[0033] 1) Configure granulation slurry, use molecular sieve catalyst raw powder (SAPO molecular sieve with a particle size of 5 μm) to mix with a certain amount of silica sol carrier, a small amount of binder (seed green powder) and aqueous solution, and the proportion of molecular sieve in all solids is 45% , the carrier is 50%, and the binder is 5%. The solid content in the slurry is 20%, and the solution is stirred by a stirring paddle, the rotation speed of the stirring paddle is 2000 rpm, and the stirring time is 1 h.

[0034] 2) The solution with a preparation content of 2% is the fixative (matrix), and the fixative component is sodium alginate (CaCl 2 , BrCl 2 ).

[0035] 3) The slurry in step 1) is fed by a peristaltic pump, and at the same time, an ultrasonic device is used to vibrate the slurry, and the vibration frequency is 40-3000 Hz.

[0036] 4) In the...

Embodiment 2

[0044] Catalyst granulation by vibration embedding granulation method, including the following operations:

[0045] The granulation slurry was prepared by mixing the original molecular sieve catalyst powder with a certain amount of aluminum sol, a small amount of binder (seed green powder) and an aqueous solution as the slurry, and the rest of the preparation conditions were the same as in Example 1.

[0046] The reaction conditions are the same as in Example 1. The activity evaluation result of this catalyst is shown in Table 2

[0047] Catalyst particle size distribution tests were performed on a Malvern Particle Sizer.

Embodiment 3

[0053] Catalyst granulation is carried out by microcapsule embedding granulation method, including the following operations:

[0054] The granulation slurry is configured, and the slurry composition is the same as that in Example 1, and the ratio of each substance in the slurry is changed. The proportion of molecular sieves in all solids is 55%, the carrier is 40%, and the binder is 5%. All the other preparation conditions are the same as in Example 1.

[0055] The reaction conditions are the same as in Example 1. The activity evaluation result of this catalyst is shown in Table 3

[0056] Catalyst particle size distribution tests were performed on a Malvern Particle Sizer.

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Abstract

The invention discloses a method for preparing fluidable a molecular sieve based on shock embedding granulation. According to the method, a molecular sieve catalyst and a carrier, a binder and water are mixed to prepare a slurry, the materials are fully stirred; mass ratio of solid content in the slurry is 10-30%, under condition that the prepared slurry is fed while being vibrated, a spray granulation method is employed for granulation; the prepared particles are injected to a matrix; the particles in the matrix are separated and dried, wherein the drying temperature is set as 40-100 DEG C; then a sieve is used for sieving, and the 60-90-mesh particles can be taken as the fluidable molecular sieve. In the method, a shock embedding granulation technology and a dry granulating method are combined, the problem that the particle size of the molecular sieve prepared by a single spray granulation method is small can be solved, a fluidable molecular sieve catalyst with particle distribution between 60-100 [mu]m is produced, the slurry is uniformly mixed, and the phenomena of vacant shell, crack and massive loss of the catalyst generated due to water molecule loss during a traditional spray drying process can be avoided.

Description

technical field [0001] The invention belongs to the technical field of catalysis and relates to a method for preparing fluidizable molecular sieves based on vibration embedding and granulation. Background technique [0002] Methanol-to-olefins (MTO) is a key technology to realize the clean conversion and utilization of coal in the new coal chemical industry that my country focuses on. It can replace the traditional petroleum route to realize the diversified development of olefin raw materials; and the production cost is lower. wide attention at home and abroad. The development of methanol to olefins technology, especially fluidized bed methanol to propylene (FMTP) technology, can extend the downstream industrial chain of the coal chemical industry to produce high value-added products such as polypropylene, acrylonitrile, isopropanol and propylene oxide, thereby improving economic benefits. The development of methanol-to-propylene technology is of great strategic significanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J37/00
CPCB01J29/85B01J37/0063
Inventor 刘蓉王晓龙何忠肖天存
Owner CHINA HUANENG GRP CO LTD