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Active alumina catalyst, and its preparation method and use

A technology of activated alumina and catalysts, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve good stability

Inactive Publication Date: 2005-02-16
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is applied in industry to prepare thioether and mercaptan, especially in dimethyl sulfide and methyl mercaptan, the selectivity is about 81.2%, and the yield is about 80%, which is not very ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1 Activated alumina A

[0017] Get 25 kilograms of 250 mesh aluminum hydroxide micropowders (containing Na 0.65%, Fe 0.038%), 0.28 kilograms of 300 mesh Tianqing powder, place in the kneader, add 4.6 kilograms of nitric acid solutions prepared by deionized water, and its nitric acid solution is Industrial concentrated nitric acid is used as raw material with a concentration of 0.5mol / L; mixed and stirred for 90 minutes, then sent to an extruder to extrude, dried and cut into strip particles with a diameter of 3.2mm and a length of 5mm, and placed in an oven Dry at 120°C for 8 hours, and finally put it in a roasting furnace to raise the temperature to 450°C, roast for 4 hours, and sieve after discharging to obtain the finished activated alumina. The impurity Na content is 0.40% (wt), and the Fe content is 0.024%. (wt), the test sample strength is 88N / cm.

[0018] The crystal form of the alumina prepared according to the method is gamma, has special pore structur...

Embodiment 2

[0019] Example 2 Activated alumina B

[0020] The difference from Example 1 is:

[0021] Get 15 kilograms of 325 mesh aluminum hydroxide micropowder (containing Na 0.40% (wt), Fe 0.039% (wt)) and boehmite micropowder 10 kilograms as raw material, prepare active alumina, add the nitric acid solution prepared by deionized water 4.6 kg, the nitric acid solution is based on industrial concentrated nitric acid as raw material, the concentration is 0.1mol / L; mixed and stirred for 60 minutes, cut into strip particles with a diameter of 4.2mm and a length of 10mm, and dried at 150°C for 12 hours, The firing temperature is 500°C for 3 hours. The finished activated alumina contains 0.23% (wt) Na and 0.024% (wt) Fe, and the strength of the sample is 101N / cm.

Embodiment 3

[0022] Example 3 Activated alumina C

[0023] The difference from Example 1 is:

[0024] Get 22 kilograms of 325 order aluminum hydroxide micropowders (containing Na 1.20% (wt), Fe 0.039% (wt)), and 3 kilograms of boehmite micropowders are raw materials to prepare activated alumina, then add 0.4 kilograms of Tian Qing powder, Add 4.4 kilograms of nitric acid solution prepared by deionized water, and its nitric acid solution is to be raw material with industrial concentrated nitric acid, and concentration is 10mol / L; Mix and stir for 120 minutes, be cut into diameter and be 2mm, the bar particle that length is 3mm, in 100 ℃ drying for 2 hours, the calcination temperature is 520 ℃, and the time is 5 hours. The finished activated alumina contains 0.71% (wt) Na and 0.024% (wt) Fe, and the sample strength is 90N / cm.

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PUM

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Abstract

The invention relates to a catalyst technology, concretely, an active alumina catalyst and its producing method. Components of the active alumina catalyst are: Na 0.8-0.1 percents, Fe<0.1 percent the others are alumina whose purity is over 99 percent. The producing approach is: using aluminium hydroxide powder or (and) bodhmite powder as material; evenly mixing aluminium hydroxide powder or (and) bodhmite with aqua fortis solution deployed by deionized water; forming, drying in 100-150deg.C for 2-8 hours, baking in 400-600deg.C for 3-20 hours, bolstering and getting production. Adopting the invention can improve selectivity and yield of compound alkyl sulfide and alkyl sulfhydrate, esp. dimethyl sulfide and methanethiol.

Description

technical field [0001] The invention relates to catalyst technology, in particular to an active alumina catalyst and its preparation method and application. Background technique [0002] Dimethyl sulfide and methyl mercaptan are components of natural gas or gas leak detection additives, and are intermediates of some important chemical synthesis products. Dimethyl sulfide can be used to further produce dimethyl sulfoxide, which is widely used in the synthesis of acrylic textiles, electronic components cleaning, aromatics extraction, diesel refining, and polymers, dyes and pharmaceutical intermediates. In the industrial production of dimethyl sulfide and methyl mercaptan, whether methanol and carbon disulfide or methanol and hydrogen sulfide are used as raw materials, activated alumina or the activity of metal oxides such as Si, Cd, Co-Mo, and Th are used Catalyst of alumina system (referring to U.S. patent, patent number is: 2437532, 2667515, 2816146, 2930816, and Chinese pa...

Claims

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Application Information

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IPC IPC(8): B01J21/12B01J23/04B01J37/00
Inventor 王贤高吴荣安杜鸿章孙承林
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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