Method for preparing pseudoboehmite

A technology of pseudo-boehmite and sodium aluminate, which is applied in the production process of chemical alumina, can solve the problems of low precipitation rate and high causticization coefficient, and achieve the effect of improving utilization rate

Inactive Publication Date: 2006-07-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the invention is to overcome the high caustic coefficient of sodium aluminate solution that causes its Al in the existing preparation method. 2 o 3 Defects with low precipitation rate, thus providing a method to precipitate pseudo-boehmite from high caustic coefficient sodium aluminate solution, and Al in sodium aluminate solution 2 o 3 A method for preparing pseudo-boehmite whose precipitation rate exceeds at least 70%, or even more than 95%.

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
  • Method for preparing pseudoboehmite
  • Method for preparing pseudoboehmite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] At 0°C, the mechanical stirring speed is 380r·min -1 Downward volume is 160ml, Al 2 o 3 The content is 50.00g·L -1 , The causticization coefficient is 3.5 (106.37g L -1 -Na 2 O) Slowly introduce CO into the sodium aluminate solution 2 35.0v% CO 2 and N 2 The mixed gas, the mixed gas flow rate is 30L·L -1 溶液 h -1 , after ventilation for 76min, the concentration of sodium hydroxide in the solution decreased to 39.51g·L - 1-Na 2 O, sodium carbonate concentration 66.86g L -1 -Na 2 O, the causticization coefficient dropped to 1.3. Subsequently, 56mL, 30.0wt% H 2 o 2 solution, H 2 o 2 / Al 2 o3 =7.0:1.0 (molar ratio), the feeding rate is 1.80ml / min. The filtrate was analyzed by ICP-AES and the precipitate Al was precipitated from the sodium aluminate solution 2 o 3 The precipitation rate is 99.3%. After aging the precipitate for 30 minutes, vacuum filter it, wash it with 30°C water until the filtrate is neutral, and dry the filter cake at 80°C to obtain th...

Embodiment 2

[0023] At 18°C, the mechanical stirring speed is 380r·min -1 Down, to a volume of 160ml, Al 2 o 3 The content is 100.00g·L -1 , The causticization coefficient is 3.0 (182.35g L -1 -Na 2 O) Slowly introduce CO into the sodium aluminate solution 2 37.0v% CO 2 and N 2 The mixed gas, the mixed gas flow rate is 45L·L -1 溶液 h -1 , after aeration for 104min, the concentration of sodium hydroxide in the solution decreased to 97.25g·L -1 -Na 2 O, the concentration of sodium carbonate is 85.10g L -1 -Na 2 O, the causticization coefficient decreased to 1.6. Subsequently, inject 257.9mL, 10.0wt% H 2 o 2 solution, H 2 o 2 / Al 2 o 3 =5.0:1.0 (molar ratio), the feed rate is 8.28ml min -1 . Analyze the filtrate with a single-channel scanning inductively coupled plasma emission spectrometer (ICP-AES, the same below), and precipitate Al from the sodium aluminate solution 2 o 3 The precipitation rate was 95.4%. After aging the precipitation for 30 minutes, it was vacuum fi...

Embodiment 3

[0027] At 30°C, mechanical stirring speed 380r·min -1 Downward volume is 160ml, Al 2 o 3 The content is 250.00g·L -1 , The causticization coefficient is 2.0 (303.92g L -1 -Na 2 O) Slowly introduce CO into the sodium aluminate solution 2 40.0% CO content 2 and N 2 The mixed gas, the mixed gas flow rate is 60L·L -1 溶液 h -1 , after ventilation for 37.4min, the concentration of sodium hydroxide in the solution decreased to 227.94g·L -1 -Na 2 O, sodium carbonate concentration 75.98g L -1 -Na 2 O, the causticization coefficient is reduced to 1.5. Subsequently, inject 253.3mL, 15.0wt% H 2 o 2 solution, H 2 o 2 / Al 2 o 3 =3.0:1.0 (molar ratio), the feed rate is 8.15ml min -1 . Analyze the filtrate with a single-channel scanning inductively coupled plasma emission spectrometer (ICP-AES, the same below), and precipitate Al from the sodium aluminate solution 2 o 3 The precipitation rate of the precipitate was 71.0%. After aging the precipitate for 30 minutes, it wa...

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 relates to a preparation method for pseudo-boehmite from sodium aluminate solution with high causticization factor, which comprises: at 0-3Deg, stirring and leading mixed gas of CO2 and N2 with 30-60L.h<-1> per litre solution speed into sodium aluminate solution contained 50.00-250.00g.L<-1> Al2O3 till the causticization factor down from more than 1.6 to 1.3-1.6; at 0-30Deg, adding 10.0-30.0wt% H2O2 solution with mole ratio as H2O2:Al2O3=3.0~7.0 and feeding time not less than 25min; separating the precipitate from the solution, ageing, filtering, clearing, and drying to obtain the final product. This invention can improve the Al2O3 utilization to reduce cost greatly.

Description

technical field [0001] The invention relates to a production process of chemical alumina, in particular to a method for preparing pseudo-boehmite from a high caustic coefficient sodium aluminate solution. Background technique [0002] Pseudo-boehmite, also known as pseudo-boehmite or pseudo-boehmite, its chemical formula can be approximately written as AlOOH·nH 2 O, n=0.08~0.62, it is a general term for a series of hydrated alumina formed under special process conditions with uncertain composition, incomplete crystallization, evolution from disorder to order, and has interface Gibbs free energy Large and unusual physical and chemical properties such as specific surface and high activity, so it has a wide range of uses. Calcined product of pseudo-boehmite under certain conditions γ-Al 2 o 3 It is widely used as catalyst carrier in the fields of Claus reaction, catalytic reforming, hydrofinishing (hydrodesulfurization, hydrodenitrogenation and hydrodemetallization, etc.), h...

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
IPC IPC(8): C01F7/14
Inventor 蔡卫权李会泉张懿郑诗礼
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap