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Method for lowering bromine index of linear alkylbenzene

A technology of linear alkylbenzene and bromine index, which is applied in chemical instruments and methods, purification/separation of hydrocarbons, hydrocarbons, etc., and can solve problems such as environmental pollution and large loss of linear alkylbenzene

Active Publication Date: 2016-04-20
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the invention is to provide a method for reducing the linear alkylbenzene bromine index, that is, to adopt Pt-Sn / SiO 2 Catalysts carry out catalytic hydrogenation reaction to reduce the bromine index of linear alkylbenzene, which solves the problem of environmental pollution caused by landfill treatment of waste clay refined from clay, and the problem of large loss of linear alkylbenzene

Method used

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  • Method for lowering bromine index of linear alkylbenzene
  • Method for lowering bromine index of linear alkylbenzene
  • Method for lowering bromine index of linear alkylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: 0.2%Pt-0.4%Sn / SiO 2 Catalyst preparation

[0038] Weigh 10g of porous silica gel carrier (its specific surface area is 480m 2 / g). From 0.0531g (1.0253×10 -4 mol) chloroplatinic acid and 2% hydrochloric acid aqueous solution with a mass fraction of HCl to prepare 6 mL of solution A. From 0.1181g (3.3685×10 -4 mol) of tin tetrachloride and 2% HCl aqueous hydrochloric acid solution to prepare 6 mL of solution B. Under nitrogen protection, stirring, and room temperature, slowly add solution B to solution A to form a 12mL impregnation solution. The concentrations of chloroplatinic acid and tin tetrachloride in the impregnation solution are 8.5441×10 -6 mol / mL and 2.8071×10 -5 mol / mL, the volume of the impregnating solution is equal to the volume of the maximum adsorbed water of the catalyst carrier; add 12mL of the impregnating solution dropwise to 10g of silica gel while stirring, and let stand for 2h after the dropwise addition; then, dry at 80°C for 24h, ...

Embodiment 2

[0039] Example 2: 0.5%Pt-0.5%Sn / SiO 2 Catalyst preparation

[0040] Weigh 10 g of the porous silica gel carrier. By 0.1327g (2.5623×10 -4 mol) chloroplatinic acid and 5% HCl aqueous hydrochloric acid solution to prepare 6 mL of solution A. By 0.1477g (4.2128×10 -4 mol) tin tetrachloride and 5% hydrochloric acid aqueous solution with a HCl mass fraction of 6 mL solution B. Under nitrogen protection, stirring, and room temperature, slowly add solution B to solution A to form a 12mL impregnation solution. The concentrations of chloroplatinic acid and tin tetrachloride in the impregnation solution are 2.1352×10 -5 mol / mL and 3.5106×10 -5 mol / mL, the volume of the impregnating solution is equal to the volume of the maximum adsorbed water of the catalyst carrier; add 12mL of the impregnating solution dropwise to 10g of silica gel while stirring, and let stand for 10h after the dropwise addition; then, dry at 100°C for 2h, Programmable heating at a rate of 1 / min to 600°C, const...

Embodiment 3

[0041] Example 3: 1%Pt-0.5%Sn / SiO 2 Catalyst preparation

[0042] Weigh 10 g of the porous silica gel carrier. By 0.2654g (5.1246×10 -4 mol) chloroplatinic acid and HCl aqueous hydrochloric acid solution with a mass fraction of 10% prepare 6 mL of solution A. By 0.1477g (4.2128×10 -4 mol) tin tetrachloride and HCl aqueous hydrochloric acid solution with a mass fraction of 10% prepare 6 mL of solution B. Under the condition of nitrogen protection, stirring and room temperature, solution B was slowly added dropwise to solution A to form 12mL impregnation solution. The concentration of chloroplatinic acid and tin tetrachloride in the impregnation solution were 4.2704×10 -5 mol / mL and 3.5106×10 -5 mol / mL, the volume of the impregnating solution is equal to the volume of the maximum adsorbed water of the catalyst carrier; add 12mL of the impregnating solution dropwise to 10g of silica gel while stirring, and let stand for 24h after the dropwise addition; then, dry at 80°C for ...

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Abstract

The invention discloses a method for lowering bromine index of linear alkylbenzene, which comprises the following steps: mixing a hydrogenation raw material and hydrogen gas at 60-350 DEG C under the pressure of 0.3-10.0 MPa at the weight hourly space velocity of 0.2-10.0 hour<-1> under the condition that the hydrogen / oil volume ratio is 300:1-8000:1, carrying out contact reaction with a Pt-Sn / SiO2 supported catalyst until olefins are saturated, thereby lowering the bromine index of the linear alkylbenzene and the improving the product quality, wherein the hydrogenation raw material is linear alkylbenzene prepared by carrying out distillation separation on a benzene-C10-C14 linear olefin alkylation mixture, or a benzene-C10-C14 linear olefin alkylation mixture. The method has the advantages of simple technical process, high catalyst activity and stability, long stable operation time of the device, low loss of linear alkylbenzene, renewable catalyst and low influence on the environment, can avoid frequent switching operation between reactor reaction and regeneration, and can avoid abundant spent catalyst after-treatment.

Description

(1) Technical field [0001] The invention relates to a method for reducing the bromine index of linear alkylbenzene, especially a method using Pt-Sn / SiO 2 The catalyst is used for catalytic hydrogenation reaction to reduce the bromine index of straight-chain alkylbenzene. (2) Background technology [0002] Benzene and C 10 ~C 14 Linear alkylbenzenes produced by the alkylation of linear olefins are the main raw materials for synthetic detergents. 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 residue, and the potential safety of production in the HF alkylation process, research on non-corrosive solid acid catalysts and environmentally friendly alkylation processes has been carried out at home and abroad. UOP and Petresa jointly The developed fixed-bed solid-acid-catalyzed Detal alkylation process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/66C07C7/163C07C15/107B01J23/62
CPCB01J23/626C07C2/66C07C7/163C07C2523/62C07C15/107
Inventor 任杰金辉
Owner ZHEJIANG UNIV OF TECH
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