A molecular sieve ceramic membrane material for olefin purification and its preparation and application

A ceramic material and molecular sieve technology, applied in the field of inorganic membrane materials, can solve the problem of inability to deeply purify polar oxygen-containing compounds, and achieve the effects of excellent rigidity and mechanical strength, deep removal accuracy, and high heat resistance.

Active Publication Date: 2020-01-31
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the technologies disclosed in the above patents and documents cannot be used for deep purification of polar oxygenates in olefin streams

Method used

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  • A molecular sieve ceramic membrane material for olefin purification and its preparation and application
  • A molecular sieve ceramic membrane material for olefin purification and its preparation and application
  • A molecular sieve ceramic membrane material for olefin purification and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Ceramic tube pretreatment: α-Al with an average pore size of 2 μm and a porosity of 55% 2 o 3 The ceramic tube was baked in a muffle furnace at 200 °C for 1 h, cooled to room temperature naturally, and the α-Al 2 o 3 The surface of the ceramic tube was polished smooth, ultrasonically cleaned with deionized water for 2 hours, dried in an oven at 120°C for 3 hours, and cooled for later use. Will be polished smooth α-Al 2 o 3 Soak the ceramic tube in polydopamine solution: prepare polydopamine solution according to the ratio of 2mL polydopamine (2mg / L) / 100mL TRIS-HCl (10mmol / L), and then place the ceramic tube in polydopamine solution under continuous stirring Soak at 25°C for 10 hours, and finally dry for later use.

[0058] Preparation of molecular sieve seed crystal sol: mix aluminum hydroxide, sodium silicate, sodium hydroxide, and deionized water according to n(Al):n(Si):n(Na):n(H 2(O)=2:3:12:300 material ratio is mixed at room temperature, the concrete method i...

Embodiment 2

[0063] Pretreatment of ceramic tube: α-Al with an average pore diameter of 0.1 μm and a porosity of 20% 2 O 3 The ceramic tube was roasted in a muffle furnace at 200 °C for 1 h, cooled to room temperature naturally, and α-Al was washed with 800-grit sandpaper. 2 O 3 The surface of the ceramic tube was polished smooth, ultrasonically cleaned with deionized water for 2 hours, dried in an oven at 120°C for 3 hours, and cooled for later use. α-Al that will be polished smooth 2 O 3 Soak the ceramic tube in the polydopamine solution: prepare the polydopamine solution according to the ratio of 2mL polydopamine (2mg / L) / 40ml TRIS-HCl (10mmol / L), then place the ceramic tube in the polydopamine solution under continuous stirring Soak at 25°C for 10h, and finally dry for later use.

[0064] Preparation of molecular sieve seed crystal sol 2 (O)=2:3:12:300 material ratio is mixed at room temperature, the concrete method is: first dissolving sodium hydroxide in a part of deionized wate...

Embodiment 3

[0069] Pretreatment of ceramic tube: α-Al with an average pore diameter of 5 μm and a porosity of 80% 2 O 3 The ceramic tube was roasted in a muffle furnace at 200 °C for 1 h, cooled to room temperature naturally, and α-Al was washed with 1500-grit sandpaper. 2 O 3 The surface of the ceramic tube was polished smooth, ultrasonically cleaned with deionized water for 2 hours, dried in an oven at 120°C for 3 hours, and cooled for later use. α-Al that will be polished smooth 2 O 3 Soak the ceramic tube in the polydopamine solution: prepare the polydopamine solution according to the ratio of 8mL polydopamine (2mg / L) / 100ml TRIS-HCl (10mmol / L), and then place the ceramic tube in the polydopamine solution under continuous stirring Soak at 25°C for 24h, and finally dry for later use.

[0070] Preparation of molecular sieve seed crystal sol 2 0) = 2:12:50:300 material ratio is mixed at room temperature, the specific method is: first dissolving sodium hydroxide in a part of deionize...

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Abstract

The invention relates to a molecular sieve ceramic membrane material for olefin purification as well as a preparation method and application of the molecular sieve ceramic membrane material. In the molecular sieve ceramic membrane material, the particle sizes of molecular sieve particles supported on the surface of the ceramic material are 0.1-3 [mu]m, and the thickness of a molecular sieve layeris 3-5 [mu]m; during preparation, ceramic material pretreatment, molecular sieve seed crystal pre-coating and sealed crystallization are sequentially carried out; and the molecular sieve ceramic membrane material is used for removing a polar oxygenated compound in a gaseous olefin flow to be 1ppm or below. Compared with the prior art, the molecular sieve ceramic membrane material prepared by the preparation method of the invention has the molecular sieve layer with higher mechanical strength, larger specific surface area and uniform thickness, in addition, the molecular sieve layer has no longitudinal or horizontal cracks, has no air pores in the surface and is high in bonding strength and not easy to fall off; and when the polar oxygenated compound in the olefin flow is adsorbed, the purification depth is 1ppm or smaller, so that not only is the mass transfer resistance lower, but also the energy consumption is lower, and the regeneration capacity is high.

Description

technical field [0001] The invention belongs to the technical field of inorganic membrane materials, and relates to a molecular sieve ceramic membrane material for olefin purification and its preparation and application. Background technique [0002] The polyolefin industry is the backbone of the petrochemical industry and occupies an important strategic position in the country. As a key prerequisite for olefin polymerization, the deep purification technology of polymer-grade olefins has a huge impact on the quality and output of polyolefin products, as well as the future development of the downstream plastics industry. With the replacement of olefin polymerization catalysts, the catalysts have higher and higher requirements for the purity of raw materials such as ethylene, propylene and butene. At present, the production technologies of olefins mainly include: steam cracking, catalytic cracking, catalytic dehydrogenation, methanol to olefins (MTO), methanol to propylene (M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D67/00B01D71/02B01J20/18B01J20/30C04B41/85C07C7/13C07C11/04C07C11/02
CPCB01D67/0079B01D71/028B01J20/06B01J20/08B01J20/18B01J2220/4806B01J2220/4812C04B41/009C04B41/5024C04B41/85C07C7/13C07C11/04C07C11/02C04B35/10Y02P30/40
Inventor 陈伟周永贤张春秀王鹏飞何秋平徐华胜张伏军
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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