Catalyst used for preparing amino acid salt through low-temperature oxidative dehydrogenation by using amino alcohol

A technology of oxidative dehydrogenation and amino acid salts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, cyanide reaction preparation, etc., can solve problems such as production equipment corrosion, and achieve good low-temperature activity , simple preparation conditions, high selectivity and stability

Inactive Publication Date: 2010-03-31
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0011] The purpose of the present invention is to provide a catalyst preparation method and a low-temperature amino alcohol oxidative dehydrogenation reaction process to solve the problem of serious corrosion of production equipment under high temperature and strong alkali reaction conditions for the production of amino acid salts by oxidative dehydrogenation of amino alcohols

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Copper nitrate and zirconium oxychloride are formulated into 400ml of a mixed solution with a total metal ion concentration of 0.3mol / L according to the copper-zirconium atomic ratio of 0.6:1, and the mixed solution and a sodium hydroxide solution with a concentration of 4.4mol / L are added dropwise Put it into a 1000ml three-neck flask, keep the precipitation temperature at 60°C, and the pH value of the precipitation at 9. After the precipitation is completed, age the precipitate at 80°C for 4 hours, dry the precipitate at 110°C for 12 hours after washing, and then heat-treat it at 250°C for 3 hours. After 1 hour, impregnate palladium chloride solution, wherein the palladium load is 2000ppm, after 12 hours of immersion, dry at 110°C for 4 hours, and roast at 500°C for 4 hours, and the solid after roasting is subjected to temperature-programmed reduction in 60ml / min reducing gas , wherein the concentration of hydrogen in the reducing gas is 90%, the heating rate is 5°C / mi...

Embodiment 2

[0028] Add 68.8g diethanolamine, 60.2g sodium hydroxide, 6.9g embodiment 1 catalyst and 140.5g water in 450ml nickel autoclave. Seal the autoclave, pressurize and replace it with nitrogen three times to remove the air in the autoclave, then heat it to 160°C, and keep the pressure in the autoclave at 0.8Mpa. After reacting for 5 hours, the conversion rate of diethanolamine was 91.8%, and the selectivity of iminodiacetate was 87.6%.

Embodiment 3

[0030]Copper nitrate and zirconium oxychloride are formulated into 400ml of a mixed solution with a total metal ion concentration of 0.3mol / L according to the copper-zirconium atomic ratio of 0.6:1, and the mixed solution and a sodium hydroxide solution with a concentration of 4.4mol / L are added dropwise Put it into a 1000ml three-neck flask, keep the precipitation temperature at 60°C, and the pH value of the precipitation at 9.0. After the precipitation is completed, age the precipitate at 80°C for 4 hours, wash the precipitate and dry it at 110°C for 12 hours, and then roast it at 500°C 4 hours. The calcined solid is subjected to temperature-programmed reduction in 60ml / min reducing gas, wherein the hydrogen concentration in the reducing gas is 90%, the heating rate is 5°C / min, and the final reduction temperature is 210°C. After 4 hours, it is lowered to room temperature Prepare Cu / ZrO2 catalyst. Put the Cu / ZrO2 catalyst into 0.045mol / L palladium chloride solution and immer...

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Abstract

The invention provides a catalyst used for preparing amino acid salt through low-temperature oxidative dehydrogenation by using amino alcohol, which uses Cu / ZrO2 as a main catalyst and Pd as a cocatalyst. The catalyst has good low temperature activity, high selectivity and stability and simple preparation conditions and can be used in industrial production of amino acid salt preparation. The aminoalcohol and alkali metal hydroxides are used as the raw materials to generate the amino acid salt through reaction in the presence of the catalyst under the conditions of low reaction temperature of140-180 DEG C and reaction pressure of 0.5-1.0MPa. The technical scheme adopted by the invention better solves the problem that the production equipment is severely corroded under the high temperatureand strong alkali reaction conditions.

Description

technical field [0001] The invention relates to a catalyst for preparing amino acid salts by low-temperature oxidative dehydrogenation of amino alcohols. Background technique [0002] Amino acid salts can be neutralized into amino acids, which are important organic chemical raw materials and can be used to synthesize herbicide glyphosate, dyes, food additives, special synthetic resins, water treatment agents, etc. [0003] Using amino alcohol and alkali metal hydroxide as raw materials, the production process of directly oxidizing and dehydrogenating amino acid salt under the action of a catalyst has the characteristics of economy, environmental protection, low production cost, high product yield and good product quality. The key to this process lies in the selection and preparation of the catalyst. [0004] In 1974, in the patent US3842081, Heinz Schulze et al. used cadmium oxide as a catalyst and reacted at 250°C to prepare amino acid salts. Although the catalyst has goo...

Claims

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Application Information

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IPC IPC(8): B01J23/89C07C227/02
Inventor 金杏妹蒯蔚刘玉娟温健麟
Owner EAST CHINA UNIV OF SCI & TECH
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