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Calcium sulfate fiber reinforced titanium oxide carrier or catalyst and preparation method thereof

A technology of fiber reinforcement and calcium sulfate, which is applied in the direction of sulfur preparation/purification, physical/chemical process catalysts, catalyst carriers, etc., which can solve the problems of large dispersion of catalyst mechanical strength, high requirements for extrusion pressure, and difficulty in the preparation process, etc. problems, to achieve the effect of perfect internal structure, high mechanical strength and complete shape

Active Publication Date: 2020-05-29
山东迅达化工集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that fibrous calcium sulfate is generated during the preparation process, which plays a reinforcing role and improves the mechanical strength and wear resistance of the titanium dioxide carrier, but its disadvantage is that the dispersion of the mechanical strength of the catalyst is still large and not stable enough, or The preparation process is difficult to master, and the requirements for extrusion pressure are still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Get six portions of each 800g of the fibrous calcium sulfate hemihydrate, and roast them in a muffle furnace at 650°C, 680°C, 700°C, 730°C, 750°C, 780°C, 800°C and air atmosphere for 3hr, all of which are placed at room temperature. After the constant temperature is over, the power is cut off and the temperature is naturally lowered to below 80°C and taken out.

[0039]After roasting at 700°C, samples were taken to test the purity, and the result was CaSO 4 The content is 99.3%.

[0040] Samples were taken from each calcined material, and the morphology was detected with an optical microscope. The results were the same as those before roasting, and the average length changed very little.

[0041] Sample 30g of each roasted material and add 150ml of water to soak at room temperature for 12hrs, stir once an hour, evaporate the leaching solution to dryness after filtration, calculate the amount of calcium sulfate dissolved by the quality of the residue, and find that the ...

Embodiment 2

[0044] Prepare the calcium sulfate fiber-reinforced titanium oxide support as follows:

[0045] A. Add 3000g of water to the 5L reactor, start stirring, add 1059g of the metatitanic acid (including 850g of titanium dioxide), beat, record the liquid level of the slurry at this time as liquid level Z; add 130g of dilute ammonia water with a concentration of 15%, and soak Remove the sulfuric acid contained in metatitanic acid within 3hr, and wash 8 times by sedimentation and water exchange method within 2hr until the washing solution is added with barium chloride-hydrochloric acid test solution and no SO can be detected 4 2- , the volume average particle size (outer diameter) of metatitanic acid in the slurry was detected by a laser particle size analyzer to be 4.3 μm, water was replenished to the liquid level Z, and 150 g of fibrous anhydrous calcium sulfate roasted at 730 ° C in Example 1 was added, and the slurry was beaten for 30 minutes to The degree of monodispersity of an...

Embodiment 3

[0050] Prepare the calcium sulfate fiber-reinforced titanium oxide carrier basically according to each step method of embodiment 2, the difference is that after the step B is kneaded, the block is extruded into a cylindrical strip with an outer diameter of 3.5mm by a twin-screw extruder, and the surface of the extruded strip is better than that of the embodiment 2 is slightly smooth.

[0051] Sampling 20g of the wet block and extruded strip before step B extrusion, add 200g of water in the same way, gently stir with a glass rod, disperse the block and extruded strip respectively, and detect the anhydrous sulfuric acid in the dispersion with an optical microscope The average lengths of calcium fibers were 78 μm and 30 μm, respectively.

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Abstract

The invention provides a calcium sulfate fiber reinforced titanium oxide carrier or a catalyst. The calcium sulfate fiber reinforced titanium oxide carrier comprises the following components in percentage by mass: 10-30% of fibrous anhydrous calcium sulfate roasted at 700-750 DEG C and 65% or more of titanium dioxide, wherein more than 90% of the fibrous anhydrous calcium sulfate is monodisperse;the calcium sulfate fiber reinforced titanium oxide carrier can be used as a catalyst; a Claus reaction process for preparing sulfur from H2S and SO2 and a direct oxidation reaction process for preparing sulfur from H2S and air are adopted; or the calcium sulfate fiber reinforced titanium oxide carrier can be taken as a carrier for further loading of other active ingredients to prepare a catalyst.The fibrous anhydrous calcium sulfate can obviously enhance the mechanical strength, wear resistance and pulverization resistance of the carrier and the catalyst, so that the discreteness is lower, the inner pore volume of the carrier or the catalyst is increased to a certain extent, and particularly, the volume of macropores with the diameter of 50nm or above is obviously increased; the raw materials are easy to obtain, and the preparation method is simple, reliable, easy to implement, easy to master, capable of being stably repeated and low in cost.

Description

technical field [0001] The invention relates to the technical field of industrial catalyst preparation, in particular to a calcium sulfate fiber-reinforced titanium oxide carrier or catalyst and a preparation method thereof. Background technique [0002] Due to its special surface properties, titania supports or further prepared catalysts can play a unique role in many reactions such as; another advantage of titania supports is that they are resistant to acidic components such as H 2 S, SO 2 , NO 2 , HCl long-term tolerance is particularly strong. [0003] For example, titanium dioxide-based sulfur recovery catalysts are used in the 2 S, SO 2 In the Claus reaction for preparing sulfur, the conversion rate allowed by the thermodynamic equilibrium can be almost reached. Under the required temperature conditions, it can be 1200h -1 High gas space velocity is used without sulfation poisoning, for organic sulfur COS and CS 2 The hydrolysis reaction is also highly active and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J27/053B01J32/00B01J35/06B01J35/10C01B17/04
CPCB01J27/053B01J21/063C01B17/0434B01J35/30B01J35/58B01J35/615B01J35/633
Inventor 胡文宾卫国锋杨金帅崔国栋邢西猛崔旭浩
Owner 山东迅达化工集团有限公司