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Linear alkylbenzene catalytic hydrofining method

A technology for catalytic hydrogenation of straight-chain alkylbenzenes, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., capable of solving problems such as environmental pollution and large loss of straight-chain alkylbenzenes

Active Publication Date: 2016-05-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for catalytic hydrogenation and refining of linear alkylbenzenes, that is, to use a palladium-loaded catalyst to carry out catalytic hydrogenation reaction, and to remove trace olefins in linear alkylbenzenes, and to solve the waste of refining clay. Environmental pollution caused by white clay landfill treatment, and the problem of large loss of linear alkylbenzene

Method used

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  • Linear alkylbenzene catalytic hydrofining method
  • Linear alkylbenzene catalytic hydrofining method
  • Linear alkylbenzene catalytic hydrofining method

Examples

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Effect test

Embodiment 1

[0038] Example 1: 5% Pd / Al 2 o 3 Catalyst preparation

[0039] Weigh 12g of Al 2 o 3Carrier (its specific surface area is 302m 2 / g). 1g (5.6398mmol) PdCl 2 Dissolve in 15% hydrochloric acid aqueous solution with HCl mass fraction, obtain 10mL impregnating solution, its palladium concentration is 5.6398×10 -4 mol / mL, the volume of the impregnation solution is equal to the volume of the maximum adsorption water of the catalyst support. Carry out impregnation at room temperature according to the equal volume impregnation method, add 10mL impregnation solution dropwise to 12g carrier, and keep stirring. After the dropwise addition, stand at room temperature for 3h. Then, it was dried at 70°C for 24 hours, put into a muffle furnace and fired at 100°C, 200°C, 300°C, and 400°C for 1 hour, and at 500°C for 4 hours to obtain a catalyst precursor. Under the condition of 10:1 volume ratio of water to solid (that is, catalyst precursor), 240 mL of distilled water was stirred and...

Embodiment 2

[0040] Example 2: 5% Pd / γ-Al 2 o 3 Catalyst preparation

[0041] Weigh 12g of γ-Al 2 o 3 As a carrier (its specific surface area is 296m 2 / g), 1.3g (5.6421mmol) palladium nitrate dihydrate was dissolved in distilled water to prepare 10mL impregnating solution, and its palladium concentration was 5.6421×10 -4 mol / mL, the volume of the impregnation solution is equal to the volume of the maximum adsorption water of the catalyst support. Carry out impregnation at room temperature according to the equal volume impregnation method, add 10mL impregnation solution dropwise to 12g carrier, and keep stirring. After the dropwise addition, it was allowed to stand at room temperature for 24h. Then, it was dried at 95°C for 3 hours, put into a muffle furnace and fired at 100°C, 200°C, 300°C, and 400°C for 1 hour, and at 600°C for 2 hours to obtain a catalyst precursor. Take the method of reduction in the reactor tube, under the pressure of 0.2MPa, the hydrogen volume space velocity ...

Embodiment 3

[0042] Example 3: 5% Pd / SiO 2 Catalyst preparation

[0043] The porous silica gel that takes by weighing 12g is as carrier (its specific surface area is 480m 2 / g), 1.3g (5.6421mmol) palladium nitrate dihydrate was dissolved in distilled water to prepare 15mL impregnating solution, and its palladium concentration was 3.7614×10 -4 mol / mL, the volume of the impregnation solution is equal to the volume of the maximum adsorption water of the catalyst support. Carry out impregnation at room temperature according to the equal volume impregnation method, add 15mL impregnation solution dropwise to 12g carrier, and keep stirring. After the dropwise addition, it was allowed to stand at room temperature for 20 h. Then, it was dried at 70°C for 24 hours, put into a muffle furnace and fired at 100°C, 200°C, 300°C, and 400°C for 1 hour, and at 450°C for 6 hours to obtain a catalyst precursor. Take the method of reduction in the reactor tube, under the pressure of 2.0MPa, the hydrogen vo...

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Abstract

The invention discloses a linear alkylbenzene catalytic hydrofining method. The method comprises the steps that under the conditions that the temperature ranges from 60 DEG C to 350 DEG C, pressure ranges from 0.3 MPa to 10.0 MPa, the mass space velocity ranges from 0.2 h<-1> to 10.0 h<-1>, and the hydrogen and oil volume ratio ranges from 300:1 to 8000:1, a hydrogenation raw material and hydrogen are mixed and react with a palladium supported type catalyst in a contact mode so that olefin can be saturated, and then a trace amount of olefin is removed, the bromine index of linear alkylbenzene is reduced, and the product quality is improved; the hydrogenation raw material is linear alkylbenzene obtained by alkylation of benzene with C10-C14 linear olefins mixture in a distillation separation mode, or is alkylation of benzene with C10-C14 linear olefins mixture. The technological process is simple, the catalyst activity is good in stability, the stable operation time of a device is long, reactor reaction and regeneration frequent switching operation can be avoided, less loss of linear alkylbenzene is realized, the catalyst is reproducible, postprocessing of a large number of catalysts can be avoided, and less influence is caused for an environment.

Description

(1) Technical field [0001] The invention relates to a method for catalytic hydrogenation and refining of straight-chain alkylbenzenes, in particular to a method for removing trace olefins in straight-chain alkylbenzenes by using a palladium-loaded catalyst for catalytic hydrogenation reaction. (2) Background technology [0002] by C 10 ~C 14 The linear alkylbenzene produced by the alkylation of linear olefins and benzene is mainly used in the production of surfactant-alkylbenzene sulfonate, which is the main raw material for the detergent industry. At present, UOP's dehydrogenation-HF alkylation process technology is widely used in the industry to produce linear alkylbenzene. Due to the serious corrosion of equipment, the generation of a large amount of waste liquid and waste residue, and the potential safety of production in the HF alkylation process, people are committed to the development of non-corrosive solid acid catalysts and environmentally friendly alkylation proc...

Claims

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Application Information

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IPC IPC(8): C07C7/163C07C15/107B01J23/44B01J37/02
CPCY02P20/584C07C7/163B01J23/44B01J37/0201
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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