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Use of copper alginate

A technology of copper alginate and sodium alginate, applied in the preparation of organic compounds, organic chemistry, bulk chemical production, etc., to achieve the effects of high conversion rate, low price, and simple preparation process

Inactive Publication Date: 2015-01-28
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Now, there has been about the preparation of alginate copper fiber material [M.Grace, N.Chand, S.K.Bajpai. Copper Alginate-Cotton Cellulose (CACC) Fibers with Excellent Antibacterial Properties.J.Eng.Fiber.Fabr.4(2009)24 -35.] and the report of catalytic alkyne cycloaddition [K.R.Reddy, K.Rajgopal, M.L Kantam, Copper-alginates: a biopolymer supported Cu(II)catalyst for 1,3-dipolar cycloaddition of alkynes with azides and oxidative coupling of 2-naphthols and phenols in water.Catal.Lett.114(2007)36-40.], but so far there has been no report of using copper alginate as a phenol hydroxylation catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Preparation of copper alginate: Weigh 4.00g sodium alginate and dissolve it in 100mL distilled water, weigh 6.82g CuCl 2 2H 2 O was dissolved in 100mL of distilled water, and sodium alginate was dropped into the copper chloride solution at 50°C and the rotation speed was 20rpm. Wash with water until the filtrate is colorless, and dry in a drying oven at 40°C for 24 hours to obtain copper alginate. The SEM image of dry beaded copper alginate is shown in figure 1 .

[0018] Embodiment 2-8 is the usage embodiment of copper alginate catalyst.

Embodiment 2

[0019] Embodiment 2: be 20: 1 to take by weighing phenol 1.0g (10mmol), catalyst 50mg by the mass ratio of phenol and catalyzer, be 1: 30 by the proportioning of the mass g of phenol and the volume mL of reaction medium, take by weighing 30mL water ;Put the weighed phenol, catalyst and water in a three-necked flask, place the three-necked flask in a constant temperature water bath, and under magnetic stirring, when the temperature reaches 70°C, weigh the phenol and hydrogen peroxide in a molar ratio of 1:2 Hydrogen peroxide 2mL (20mmol) was added dropwise into the there-necked flask at a rate of 0.1mL / min. After the addition, the timing reaction was started, and the reaction time was 1 hour to obtain the target product. The reaction solution after the reaction in the example was suction-filtered, the catalyst and the reaction solution were separated, the recovered catalyst was washed with ethanol until the washing solution was colorless, and the catalyst was placed in a drying ...

Embodiment 3

[0020] Embodiment 3: be 50: 1 by weighing phenol 1.0g (10mmol), catalyst 20mg by the mass ratio of phenol and catalyst, be 1: 30g / mL by the proportioning of the mass of phenol and the volume of reaction medium, take by weighing 30mL water ;Put the weighed phenol, catalyst and water in a three-necked flask, place the three-necked flask in a constant temperature water bath, and under magnetic stirring, when the temperature reaches 70°C, weigh the phenol and hydrogen peroxide in a molar ratio of 1:3 3mL (30mmol) of hydrogen peroxide was added dropwise in the there-necked flask at a rate of 0.1mL / min. After the addition, the timing reaction was started, and the reaction time was 4 hours to obtain the target product. The reaction solution after the reaction in the example was suction-filtered, the catalyst and the reaction solution were separated, the recovered catalyst was washed with ethanol until the washing solution was colorless, and the catalyst was placed in a drying oven at ...

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Abstract

The invention discloses a use of copper alginate. In the invention, copper alginate is used as a catalyst for preparation of hydroquinone and catechol by phenol hydroxylation. The copper alginate as a catalyst is prepared from a raw material of a biopolymer sodium alginate which has wide sources and a low price and is nontoxic and environmentally friendly. The copper alginate as a catalyst has simple preparation processes, a low synthesis cost, high reaction activity, good selectivity, no pollution in use of production equipment and no harmful effect on the environment, and is an environmentally-friendly catalyst. The copper alginate as a catalyst has a high phenol conversion rate of 62.4% and high benzenediol selectivity of 99.6%, is suitable for industrialized popularization and can be recycled.

Description

technical field [0001] The invention relates to the application of copper alginate as a catalyst for the hydroxylation of phenol to produce hydroquinone and catechol. Background technique [0002] Hydroquinone and catechol are two important fine chemical products with a wide range of uses. Using hydrogen peroxide as an oxidant, phenol hydroxylation to produce hydroquinone and catechol is a production process commonly used in the world at present. According to the different catalysts used, it can be mainly divided into Rhone-poulenc method (Ger P 2,321,747; Ger P 2,410,758), Brichime method (Brit P1,332,420; Brit P 2,341,743; Brit P 2,341,743; P 2,407,398), UBE method and Enichem method (USP 4,410,501; Brit P 2,116,974). [0003] The French Rhone-Poulenc method is based on HClO 4 as catalyst, H 3 PO 4 As a co-catalyst, because when the conversion rate of phenol is high, the by-product tar is more, therefore, the process generally controls the conversion rate of phenol to...

Claims

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Application Information

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IPC IPC(8): C07C39/08C07C37/60
CPCY02P20/52Y02P20/584
Inventor 张龙史丰炜
Owner CHANGCHUN UNIV OF TECH
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